Average Weather in Fitchburg Massachusetts, United States
In Fitchburg, the summers are warm, the winters are freezing, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 16°F to 82°F and is rarely below -0°F or above 90°F.
Based on the tourism score, the best time of year to visit Fitchburg 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 72°F. The hottest day of the year is July 21, with an average high of 82°F and low of 63°F.
The cold season lasts for 3.3 months, from December 2 to March 13, with an average daily high temperature below 42°F. The coldest day of the year is January 29, with an average low of 16°F and high of 33°F.
Average High and Low Temperature
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
In Fitchburg, 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 Fitchburg begins around June 26 and lasts for 4.1 months, ending around October 31. On September 6, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 64% of the time, and overcast or mostly cloudy 36% of the time.
The cloudier part of the year begins around October 31 and lasts for 7.9 months, ending around June 26. On March 1, the cloudiest day of the year, the sky is overcast or mostly cloudy 56% of the time, and clear, mostly clear, or partly cloudy 44% 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 Fitchburg varies throughout the year.
The wetter season lasts 3.5 months, from May 1 to August 19, with a greater than 29% chance of a given day being a wet day. The chance of a wet day peaks at 36% on June 13.
The drier season lasts 8.5 months, from August 19 to May 1. The smallest chance of a wet day is 21% 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 Fitchburg changes throughout the year.
Rain alone is the most common for 10 months, from February 23 to December 26. The highest chance of a day with rain alone is 36% on June 13.
Snow alone is the most common for 1.9 months, from December 26 to February 23. The highest chance of a day with snow alone is 11% on January 8.
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. Fitchburg experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Fitchburg. The most rain falls during the 31 days centered around October 9, with an average total accumulation of 3.9 inches.
The least rain falls around January 23, with an average total accumulation of 1.3 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. Fitchburg experiences significant seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 5.8 months, from October 25 to April 20, 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 27, with an average total liquid-equivalent accumulation of 1.5 inches.
The snowless period of the year lasts for 6.2 months, from April 20 to October 25. The least snow falls around July 31, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Fitchburg varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 3 minutes of daylight; the longest day is June 21, with 15 hours, 19 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:08 AM on June 15, and the latest sunrise is 2 hours, 14 minutes later at 7:23 AM on November 3. The earliest sunset is at 4:13 PM on December 7, and the latest sunset is 4 hours, 15 minutes later at 8:28 PM on June 27.
Daylight saving time (DST) is observed in Fitchburg 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
Fitchburg experiences significant seasonal variation in the perceived humidity.
The muggier period of the year lasts for 3.3 months, from June 10 to September 19, during which time the comfort level is muggy, oppressive, or miserable at least 8% of the time. The muggiest day of the year is July 30, with muggy conditions 30% of the time.
The least muggy day of the year is December 12, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed in Fitchburg experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 5.3 months, from November 17 to April 28, with average wind speeds of more than 5.1 miles per hour. The windiest day of the year is February 23, with an average hourly wind speed of 6.6 miles per hour.
The calmer time of year lasts for 6.7 months, from April 28 to November 17. The calmest day of the year is August 12, with an average hourly wind speed of 3.6 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Fitchburg is from the west throughout the year.
Fitchburg 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 3.0 months, from June 25 to September 25, with an average temperature above 60°F. The day of the year with the warmest water is August 6, with an average temperature of 65°F.
The time of year with cooler water lasts for 3.9 months, from December 28 to April 23, with an average temperature below 44°F. The day of the year with the coolest water is March 6, with an average temperature of 38°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Fitchburg 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 Fitchburg 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 Fitchburg for hot-weather activities is from early July to mid August, with a peak score in the last week of July.
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.
The growing season in Fitchburg typically lasts for 5.5 months (166 days), from around April 30 to around October 13, rarely starting before April 14 or after May 17, and rarely ending before September 27 or after October 30.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Fitchburg should appear around April 24, only rarely appearing before April 11 or after May 5.
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 3.5 months, from May 5 to August 21, with an average daily incident shortwave energy per square meter above 5.8 kWh. The brightest day of the year is June 30, with an average of 6.8 kWh.
The darker period of the year lasts for 3.3 months, from November 2 to February 10, with an average daily incident shortwave energy per square meter below 2.6 kWh. The darkest day of the year is December 24, with an average of 1.6 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Fitchburg are 42.583 deg latitude, -71.802 deg longitude, and 640 ft elevation.
The topography within 2 miles of Fitchburg contains significant variations in elevation, with a maximum elevation change of 705 feet and an average elevation above sea level of 600 feet. Within 10 miles contains significant variations in elevation (1,788 feet). Within 50 miles contains very significant variations in elevation (3,117 feet).
The area within 2 miles of Fitchburg is covered by artificial surfaces (59%) and trees (41%), within 10 miles by trees (79%) and artificial surfaces (18%), and within 50 miles by trees (72%) and artificial surfaces (21%).
This report illustrates the typical weather in Fitchburg, 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 Fitchburg.
For each station, the records are corrected for the elevation difference between that station and Fitchburg 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 Fitchburg is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Fitchburg and a given station.
The stations contributing to this reconstruction are: Fitchburg Municipal Airport (68%, 5.2 kilometers, southeast); Jaffrey Municipal-Silver Ranch Airport (12%, 30 kilometers, northwest); Boire Field (11%, 32 kilometers, northeast); and Orange Municipal Airport (9%, 40 kilometers, west).
Time zones for aiports and weather stations are provided by AskGeo.com .