Average Weather in Watertown Connecticut, United States
In Watertown, 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 19°F to 81°F and is rarely below 4°F or above 88°F.
Based on the tourism score, the best time of year to visit Watertown for warm-weather activities is from mid June to mid September.
The warm season lasts for 3.5 months, from May 30 to September 16, with an average daily high temperature above 71°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 12, with an average daily high temperature below 43°F. The coldest day of the year is January 30, with an average low of 19°F and high of 34°F.
Average High and Low Temperature
Average Hourly Temperature
In Watertown, 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 Watertown begins around June 25 and lasts for 4.6 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 7.4 months, ending around June 25. On February 28, the cloudiest day of the year, the sky is overcast or mostly cloudy 54% of the time, and clear, mostly clear, or partly cloudy 46% of the time.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Watertown varies throughout the year.
The wetter season lasts 3.4 months, from May 4 to August 18, with a greater than 30% chance of a given day being a wet day. The chance of a wet day peaks at 37% on May 30.
The drier season lasts 8.6 months, from August 18 to May 4. 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 Watertown changes throughout the year.
Rain alone is the most common for 11 months, from January 27 to January 7. The highest chance of a day with rain alone is 37% on May 30.
Snow alone is the most common for 2.9 weeks, from January 7 to January 27. The highest chance of a day with snow alone is 10% on January 11.
Daily Chance of Precipitation
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. Watertown experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Watertown. The most rain falls during the 31 days centered around June 4, with an average total accumulation of 4.0 inches.
The least rain falls around January 24, with an average total accumulation of 1.6 inches.
Average Monthly Rainfall
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. Watertown experiences significant seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 5.6 months, from October 30 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 1.2 inches.
The snowless period of the year lasts for 6.4 months, from April 18 to October 30. The least snow falls around July 17, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Watertown varies significantly over the course of the year. In 2018, 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 earliest sunrise is at 5:17 AM on June 14, and the latest sunrise is 2 hours, 9 minutes later at 7:26 AM on November 3. The earliest sunset is at 4:22 PM on December 8, and the latest sunset is 4 hours, 9 minutes later at 8:30 PM on June 27.
Daylight saving time (DST) is observed in Watertown during 2018, starting in the spring on March 11, lasting 7.8 months, and ending in the fall on November 4.
Sunrise & Sunset with Twilight and Daylight Saving Time
Watertown experiences significant seasonal variation in the perceived humidity.
The muggier period of the year lasts for 3.4 months, from June 7 to September 19, 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 35% of the time.
The least muggy day of the year is February 23, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed in Watertown experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 5.3 months, from November 13 to April 23, with average wind speeds of more than 5.2 miles per hour. The windiest day of the year is February 26, with an average hourly wind speed of 6.8 miles per hour.
The calmer time of year lasts for 6.7 months, from April 23 to November 13. The calmest day of the year is August 1, with an average hourly wind speed of 3.6 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Watertown varies throughout the year.
The wind is most often from the north for 1.7 months, from March 9 to April 29, with a peak percentage of 35% on March 11. The wind is most often from the south for 1.3 months, from April 29 to June 8 and for 2.2 months, from July 26 to October 1, with a peak percentage of 35% on July 28. The wind is most often from the west for 1.6 months, from June 8 to July 26 and for 5.3 months, from October 1 to March 9, with a peak percentage of 39% on July 7.
Watertown 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 24 to October 11, with an average temperature above 65°F. The day of the year with the warmest water is August 12, with an average temperature of 72°F.
The time of year with cooler water lasts for 3.4 months, from December 31 to April 13, 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
Best Time of Year to Visit
To characterize how pleasant the weather is in Watertown 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 Watertown for general outdoor tourist activities is from mid June to mid September, with a peak score in the second week of August.
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 Watertown for hot-weather activities is from early July to mid August, with a peak score in the last week of July.
The growing season in Watertown typically lasts for 5.6 months (170 days), from around April 27 to around October 14, rarely starting before April 8 or after May 20, and rarely ending before September 27 or after November 2.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Watertown should appear around April 24, only rarely appearing before April 9 or after May 7.
Growing Degree Days
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 2 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 11, 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
For the purposes of this report, the geographical coordinates of Watertown are 41.606 deg latitude, -73.118 deg longitude, and 669 ft elevation.
The topography within 2 miles of Watertown contains significant variations in elevation, with a maximum elevation change of 512 feet and an average elevation above sea level of 684 feet. Within 10 miles contains significant variations in elevation (1,093 feet). Within 50 miles contains very significant variations in elevation (2,602 feet).
The area within 2 miles of Watertown is covered by trees (61%) and artificial surfaces (31%), within 10 miles by trees (80%) and artificial surfaces (15%), and within 50 miles by trees (66%) and water (15%).
This report illustrates the typical weather in Watertown, 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Watertown.
For each station, the records are corrected for the elevation difference between that station and Watertown 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 Watertown is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Watertown and a given station.
Time zones for aiports and weather stations are provided by AskGeo.com .