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Average Weather in Sherman Connecticut, United States

In Sherman, the summers are warm and wet, the winters are freezing, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 17°F to 81°F and is rarely below 2°F or above 89°F.

Climate Summary

very coldcoldcoolwarmcoolcoldvery coldJanFebMarAprMayJunJulAugSepOctNovDec65%65%47%47%clearovercastprecipitation: 3.9 inprecipitation: 3.9 in2.7 in2.7 inmuggy: 37%muggy: 37%0%0%drydrytourism score: 6.6tourism score: 6.60.00.0
Click on each chart for more information.

Based on the tourism score, the best time of year to visit Sherman for warm-weather activities is from mid June to mid September.

Temperature

The warm season lasts for 3.5 months, from May 30 to September 16, with an average daily high temperature above 72°F. The hottest day of the year is July 21, with an average high of 81°F and low of 62°F.

The cold season lasts for 3.3 months, from December 2 to March 11, with an average daily high temperature below 43°F. The coldest day of the year is January 29, with an average low of 17°F and high of 33°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 ShermanJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMfreezingvery coldvery coldcoldcoldcoolcomfortablewarmfreezingfreezingcomfortable
The average hourly temperature, color coded into bands: 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 shaded overlays indicate night and civil twilight.

Udarnyy, Russia (5,308 miles away) and Ardabīl, Iran (5,823 miles) are the far-away foreign places with temperatures most similar to Sherman (view comparison).

Clouds

In Sherman, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.

The clearer part of the year in Sherman begins around June 25 and lasts for 4.5 months, ending around November 11. On September 6, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 65% of the time, and overcast or mostly cloudy 35% of the time.

The cloudier part of the year begins around November 11 and lasts for 7.5 months, ending around June 25. On February 24, the cloudiest day of the year, the sky is overcast or mostly cloudy 54% of the time, and clear, mostly clear, or partly cloudy 47% of the time.

Cloud Cover Categories

Cloud Cover Categories in ShermanclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Sep 665%Sep 665%Feb 2447%Feb 2447%Jun 2555%Jun 2555%Nov 1156%Nov 1156%clearmostly clearpartly cloudymostly cloudyovercast
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Sherman varies throughout the year.

The wetter season lasts 4.4 months, from April 10 to August 22, with a greater than 30% chance of a given day being a wet day. The chance of a wet day peaks at 38% on May 30.

The drier season lasts 7.6 months, from August 22 to April 10. The smallest chance of a wet day is 22% on January 29.

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 in Sherman changes throughout the year.

Rain alone is the most common for 11 months, from February 5 to January 3. The highest chance of a day with rain alone is 38% on May 30.

Snow alone is the most common for 1.1 months, from January 3 to February 5. The highest chance of a day with snow alone is 10% on January 9.

Daily Chance of Precipitation

Daily Chance of Precipitation in ShermansnowrainJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%May 3038%May 3038%Jan 2922%Jan 2922%Jan 125%Jan 125%Apr 1030%Apr 1030%Aug 2230%Aug 2230%snowrainmixed
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).

Rainfall

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. Sherman experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Sherman. The most rain falls during the 31 days centered around June 5, with an average total accumulation of 3.9 inches.

The least rain falls around January 24, with an average total accumulation of 1.4 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.

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. Sherman experiences significant seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 5.7 months, from October 27 to April 18, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 24, with an average total liquid-equivalent accumulation of 1.3 inches.

The snowless period of the year lasts for 6.3 months, from April 18 to October 27. The least snow falls around July 17, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall in ShermansnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.5 in1.0 in1.5 in2.0 in2.5 in3.0 in3.5 in4.0 inJan 241.3 inJan 241.3 inJul 170.0 inJul 170.0 inOct 270.1 inOct 270.1 inApr 180.1 inApr 180.1 in
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.

Sun

The length of the day in Sherman varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 10 minutes of daylight; the longest day is June 21, with 15 hours, 12 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 5:19 AM on June 14, and the latest sunrise is 2 hours, 11 minutes later at 7:29 AM on November 4. The earliest sunset is at 4:23 PM on December 8, and the latest sunset is 4 hours, 8 minutes later at 8:32 PM on June 27.

Daylight saving time (DST) is observed in Sherman during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time in ShermanJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 145:19 AMJun 145:19 AM8:32 PMJun 278:32 PMJun 27Dec 84:23 PMDec 84:23 PM7:29 AMNov 47:29 AMNov 4Mar 12DSTMar 12DSTDSTNov 5DSTNov 5daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2017. 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.

Humidity

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.

Sherman experiences significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.5 months, from June 5 to September 20, during which time the comfort level is muggy, oppressive, or miserable at least 9% of the time. The muggiest day of the year is July 30, with muggy conditions 37% of the time.

The least muggy day of the year is December 11, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels in ShermanmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Dec 110%Dec 110%Jul 3037%Jul 3037%Jun 59%Jun 59%Sep 209%Sep 209%muggymuggydrydryhumidhumidoppressiveoppressivecomfortablecomfortable
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

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 Sherman experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.2 months, from November 16 to April 23, with average wind speeds of more than 5.1 miles per hour. The windiest day of the year is February 26, with an average hourly wind speed of 6.6 miles per hour.

The calmer time of year lasts for 6.8 months, from April 23 to November 16. The calmest day of the year is August 1, with an average hourly wind speed of 3.5 miles per hour.

Average Wind Speed

Average Wind Speed in ShermanwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph1 mph2 mph3 mph4 mph5 mph6 mph7 mph8 mph9 mph10 mph11 mphFeb 266.6 mphFeb 266.6 mphAug 13.5 mphAug 13.5 mphNov 165.1 mphNov 165.1 mphApr 235.1 mphApr 235.1 mph
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 Sherman varies throughout the year.

The wind is most often from the north for 2.2 months, from March 1 to May 8; for 1.1 weeks, from August 29 to September 6; and for 1.0 weeks, from September 25 to October 2, with a peak percentage of 36% on March 11. The wind is most often from the south for 1.1 months, from May 8 to June 11; for 1.1 months, from July 27 to August 29; for 2.7 weeks, from September 6 to September 25; and for 4.0 days, from October 2 to October 6, with a peak percentage of 34% on August 6. The wind is most often from the west for 1.5 months, from June 11 to July 27 and for 4.8 months, from October 6 to March 1, with a peak percentage of 38% on July 7.

Wind Direction

Wind Direction in ShermanWNSWSSWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westsouthnortheast
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Sherman is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.6 months, from June 23 to October 11, with an average temperature above 65°F. The day of the year with the warmest water is August 11, with an average temperature of 72°F.

The time of year with cooler water lasts for 3.4 months, from December 31 to April 12, with an average temperature below 43°F. The day of the year with the coolest water is February 21, with an average temperature of 36°F.

Average Water Temperature

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Best Time of Year to Visit

To characterize how pleasant the weather is in Sherman 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 Sherman for general outdoor tourist activities is from mid June to mid September, with a peak score in the second week of August.

Tourism Score

Tourism Score in Shermanbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.66.60.00.0 precipitationprecipitationcloudscloudstemperaturetemperaturetourism score
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 Sherman for hot-weather activities is from early July to mid August, with a peak score in the last week of July.

Beach/Pool Score

Beach/Pool Score in Shermanbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468105.25.20.00.0 precipitationprecipitationcloudscloudstemperaturetemperaturebeach/pool score
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).

Methodology

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.

Growing Season

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 Sherman typically lasts for 5.3 months (163 days), from around May 2 to around October 12, rarely starting before April 12 or after May 23, and rarely ending before September 25 or after October 31.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Shermangrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 250%May 250%Oct 1250%Oct 1250%May 2390%May 2390%Sep 2590%Sep 2590%Apr 1210%Apr 1210%Oct 3110%Oct 3110%Jul 25100%Jul 25100%frigidfreezingvery coldcoolcomfortablewarmcoldhot
The percentage of time spent in various temperature bands: 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 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 Sherman should appear around April 23, only rarely appearing before April 8 or after May 5.

Growing Degree Days

The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.6 months, from May 1 to August 21, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest day of the year is June 30, with an average of 6.9 kWh.

The darker period of the year lasts for 3.2 months, from November 4 to February 10, with an average daily incident shortwave energy per square meter below 2.7 kWh. The darkest day of the year is December 23, with an average of 1.7 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.

Topography

For the purposes of this report, the geographical coordinates of Sherman are 41.579 deg latitude, -73.496 deg longitude, and 702 ft elevation.

The topography within 2 miles of Sherman contains very significant variations in elevation, with a maximum elevation change of 873 feet and an average elevation above sea level of 711 feet. Within 10 miles also contains very significant variations in elevation (1,257 feet). Within 50 miles contains very significant variations in elevation (3,553 feet).

The area within 2 miles of Sherman is covered by trees (95%), within 10 miles by trees (88%), and within 50 miles by trees (67%) and artificial surfaces (15%).

Data Sources

This report illustrates the typical weather in Sherman, 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Sherman.

For each station, the records are corrected for the elevation difference between that station and Sherman 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 Sherman is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Sherman and a given station.

The stations contributing to this reconstruction are: Danbury Municipal Airport (43%, 23 kilometers, south); Waterbury-Oxford Airport (28%, 32 kilometers, east); Dutchess County Airport (23%, 33 kilometers, west); and Pittsfield Municipal Airport (5%, 96 kilometers, north).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports 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.

Disclaimer

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.