Average Weather in Worcester Massachusetts, United States
In Worcester, 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 19°F to 81°F and is rarely below 4°F or above 89°F.
Based on the tourism score, the best time of year to visit Worcester for warm-weather activities is from mid June to mid September.
The warm season lasts for 3.5 months, from May 31 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 64°F.
The cold season lasts for 3.3 months, from December 2 to March 13, 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 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 Worcester, 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 Worcester begins around June 25 and lasts for 4.3 months, ending around November 2. 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 November 2 and lasts for 7.7 months, ending around June 25. On February 28, 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 Worcester varies throughout the year.
The wetter season lasts 5.0 months, from March 20 to August 20, with a greater than 29% chance of a given day being a wet day. The chance of a wet day peaks at 35% on June 13.
The drier season lasts 7.0 months, from August 20 to March 20. 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 Worcester changes throughout the year.
Rain alone is the most common for 11 months, from February 5 to January 6. The highest chance of a day with rain alone is 35% on June 13.
Snow alone is the most common for 4.3 weeks, from January 6 to February 5. The highest chance of a day with snow alone is 10% on January 9.
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. Worcester experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Worcester. The most rain falls during the 31 days centered around October 12, with an average total accumulation of 3.9 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. Worcester experiences significant seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 5.6 months, from October 29 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 27, with an average total liquid-equivalent accumulation of 1.3 inches.
The snowless period of the year lasts for 6.4 months, from April 18 to October 29. The least snow falls around July 21, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Worcester varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 5 minutes of daylight; the longest day is June 21, with 15 hours, 16 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:10 AM on June 14, and the latest sunrise is 2 hours, 13 minutes later at 7:22 AM on November 3. The earliest sunset is at 4:14 PM on December 7, and the latest sunset is 4 hours, 13 minutes later at 8:27 PM on June 27.
Daylight saving time (DST) is observed in Worcester 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
Worcester experiences significant seasonal variation in the perceived humidity.
The muggier period of the year lasts for 3.3 months, from June 10 to September 20, 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 33% 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 Worcester experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 5.4 months, from November 15 to April 29, 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 6.6 months, from April 29 to November 15. 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 Worcester is from the west throughout the year.
Worcester 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 3.1 months, from June 25 to September 27, with an average temperature above 61°F. The day of the year with the warmest water is August 7, with an average temperature of 66°F.
The time of year with cooler water lasts for 3.8 months, from December 28 to April 21, with an average temperature below 44°F. The day of the year with the coolest water is February 27, with an average temperature of 38°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Worcester 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 Worcester for general outdoor tourist activities is from mid June to mid September, with a peak score in the third 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 Worcester 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 Worcester typically lasts for 6.1 months (185 days), from around April 17 to around October 20, rarely starting before April 1 or after May 3, and rarely ending before October 1 or after November 8.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Worcester should appear around April 23, only rarely appearing before April 9 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 3 to February 11, 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 Worcester are 42.263 deg latitude, -71.802 deg longitude, and 535 ft elevation.
The topography within 2 miles of Worcester contains only modest variations in elevation, with a maximum elevation change of 351 feet and an average elevation above sea level of 539 feet. Within 10 miles contains only modest variations in elevation (1,135 feet). Within 50 miles contains very significant variations in elevation (3,117 feet).
The area within 2 miles of Worcester is covered by artificial surfaces (96%), within 10 miles by trees (69%) and artificial surfaces (26%), and within 50 miles by trees (67%) and artificial surfaces (25%).
This report illustrates the typical weather in Worcester, 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Worcester.
For each station, the records are corrected for the elevation difference between that station and Worcester 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 Worcester is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Worcester and a given station.
The stations contributing to this reconstruction are: Worcester, Worcester Regional Airport (53%, 5.9 kilometers, west); Fitchburg Municipal Airport (18%, 32 kilometers, north); North Central State Airport (11%, 46 kilometers, southeast); Lawrence G Hanscom Field (10%, 48 kilometers, northeast); and Norwood Memorial Airport (8%, 52 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .