In Winchester, the summers are warm and humid, the winters are very cold and wet, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 27°F to 85°F and is rarely below 10°F or above 92°F.
Based on the tourism score, the best time of year to visit Winchester for warm-weather activities is from mid June to late September.
very coldcoldcoolwarmwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow68%68%40%40%clearovercastprecipitation: 4.2 inprecipitation: 4.2 in2.5 in2.5 inmuggy: 67%muggy: 67%0%0%drydrytourism score: 6.6tourism score: 18.104.22.168
Click on each chart for more information.
The hot season lasts for 3.8 months, from May 26 to September 20, with an average daily high temperature above 76°F. The hottest day of the year is July 20, with an average high of 85°F and low of 67°F.
The cold season lasts for 3.0 months, from November 29 to February 28, with an average daily high temperature below 50°F. The coldest day of the year is January 29, with an average low of 27°F and high of 42°F.
Average High and Low Temperature
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature
Average Hourly Temperature in WinchesterJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowfreezingvery coldvery coldcoldcoldcoolcoolcomfortablewarm
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.
In Winchester, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year in Winchester begins around June 14 and lasts for 4.9 months, ending around November 10. On August 26, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 68% of the time, and overcast or mostly cloudy 32% of the time.
The cloudier part of the year begins around November 10 and lasts for 7.1 months, ending around June 14. On January 1, the cloudiest day of the year, the sky is overcast or mostly cloudy 61% of the time, and clear, mostly clear, or partly cloudy 40% of the time.
Cloud Cover Categories
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Winchester varies throughout the year.
The wetter season lasts 5.0 months, from March 19 to August 20, with a greater than 33% chance of a given day being a wet day. The chance of a wet day peaks at 42% on May 11.
The drier season lasts 7.0 months, from August 20 to March 19. The smallest chance of a wet day is 24% on January 14.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 42% on May 11.
Daily Chance of Precipitation
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Winchester experiences some seasonal variation in monthly rainfall.
Rain falls throughout the year in Winchester. The most rain falls during the 31 days centered around May 17, with an average total accumulation of 4.2 inches.
The least rain falls around January 21, with an average total accumulation of 2.4 inches.
Average Monthly Rainfall
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Winchester experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 3.7 months, from December 1 to March 22, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around February 3, with an average total liquid-equivalent accumulation of 0.3 inches.
The snowless period of the year lasts for 8.3 months, from March 22 to December 1. The least snow falls around July 18, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The average liquid-equivalent snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average rainfall.
The length of the day in Winchester varies significantly over the course of the year. In 2021, the shortest day is December 21, with 9 hours, 32 minutes of daylight; the longest day is June 20, with 14 hours, 48 minutes of daylight.
Hours of Daylight and Twilight
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.
The earliest sunrise is at 6:13 AM on June 13, and the latest sunrise is 1 hour, 54 minutes later at 8:08 AM on November 6. The earliest sunset is at 5:16 PM on December 7, and the latest sunset is 3 hours, 46 minutes later at 9:03 PM on June 28.
Daylight saving time (DST) is observed in Winchester during 2021, starting in the spring on March 14, lasting 7.8 months, and ending in the fall on November 7.
Sunrise & Sunset with Twilight and Daylight Saving Time
The solar day over the course of the year 2021. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the ‘DST’ labels.
The figure below presents a compact representation of key lunar data for 2021. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.
Moon Rise, Set & Phases
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
Winchester experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 4.0 months, from May 23 to September 24, during which time the comfort level is muggy, oppressive, or miserable at least 17% of the time. The muggiest day of the year is July 24, with muggy conditions 67% of the time.
The least muggy day of the year is January 30, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed in Winchester experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 6.6 months, from October 27 to May 13, with average wind speeds of more than 7.0 miles per hour. The windiest day of the year is February 25, with an average hourly wind speed of 8.9 miles per hour.
The calmer time of year lasts for 5.4 months, from May 13 to October 27. The calmest day of the year is August 1, with an average hourly wind speed of 5.2 miles per hour.
Average Wind Speed
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
The predominant average hourly wind direction in Winchester varies throughout the year.
The wind is most often from the south for 3.7 weeks, from May 12 to June 7 and for 3.4 months, from August 26 to December 8, with a peak percentage of 38% on November 20. The wind is most often from the west for 2.6 months, from June 7 to August 26 and for 5.1 months, from December 8 to May 12, with a peak percentage of 44% on July 13.
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).
To characterize how pleasant the weather is in Winchester throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Winchester for general outdoor tourist activities is from mid June to late September, with a peak score in the last week of August.
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Winchester for hot-weather activities is from late June to early September, with a peak score in the last week of July.
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).
The growing season in Winchester typically lasts for 6.5 months (199 days), from around April 9 to around October 25, rarely starting before March 23 or after April 24, and rarely ending before October 6 or after November 12.
Time Spent in Various Temperature Bands and the Growing Season
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.
Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.
Based on growing degree days alone, the first spring blooms in Winchester should appear around March 14, only rarely appearing before February 27 or after April 1.
Growing Degree Days
Growing Degree Days in WinchesterJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°F3,000°F3,000°F3,500°F3,500°F4,000°F4,000°FMar 1487°FMar 1487°FJun 3900°FJun 3900°FJul 131,800°FJul 131,800°FDec 313,892°FDec 313,892°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy experiences significant seasonal variation over the course of the year.
The brighter period of the year lasts for 4.3 months, from April 24 to September 4, with an average daily incident shortwave energy per square meter above 5.7 kWh. The brightest day of the year is July 2, with an average of 6.6 kWh.
The darker period of the year lasts for 3.0 months, from November 9 to February 10, with an average daily incident shortwave energy per square meter below 2.9 kWh. The darkest day of the year is December 25, with an average of 2.0 kWh.
Average Daily Incident Shortwave Solar Energy
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
For the purposes of this report, the geographical coordinates of Winchester are 37.990 deg latitude, -84.180 deg longitude, and 994 ft elevation.
The topography within 2 miles of Winchester contains only modest variations in elevation, with a maximum elevation change of 167 feet and an average elevation above sea level of 970 feet. Within 10 miles contains only modest variations in elevation (571 feet). Within 50 miles contains significant variations in elevation (1,194 feet).
The area within 2 miles of Winchester is covered by cropland (60%) and artificial surfaces (40%), within 10 miles by cropland (83%) and trees (15%), and within 50 miles by cropland (49%) and trees (48%).
This report illustrates the typical weather in Winchester, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Winchester.
For each station, the records are corrected for the elevation difference between that station and Winchester according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Winchester is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Winchester and a given station.
The stations contributing to this reconstruction are: Mount Sterling-Montgomery County Airport (60%, 19 kilometers, northeast); Blue Grass Airport (22%, 38 kilometers, west); and Madison Airport (19%, 42 kilometers, south).
All data relating to the Sun’s position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA’s MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA’s Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for airports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.