Average Weather in Randolph Massachusetts, United States
In Randolph, the summers are warm, 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 21°F to 84°F and is rarely below 6°F or above 92°F.
Based on the tourism score, the best time of year to visit Randolph for warm-weather activities is from mid June to mid September.
The warm season lasts for 3.4 months, from June 3 to September 14, with an average daily high temperature above 74°F. The hottest day of the year is July 20, with an average high of 84°F and low of 64°F.
The cold season lasts for 3.4 months, from December 3 to March 14, with an average daily high temperature below 46°F. The coldest day of the year is January 30, with an average low of 21°F and high of 37°F.
Average High and Low Temperature
Average Hourly Temperature
In Randolph, 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 Randolph begins around June 26 and lasts for 4.4 months, ending around November 8. 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 8 and lasts for 7.6 months, ending around June 26. On February 26, 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
Randolph does not experience significant seasonal variation in the frequency of wet days (i.e., those with greater than 0.04 inches of liquid or liquid-equivalent precipitation). The frequency ranges from 23% to 32%, with an average value of 28%.
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 32% on May 24.
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. Randolph experiences some seasonal variation in monthly rainfall.
Rain falls throughout the year in Randolph. The most rain falls during the 31 days centered around April 1, with an average total accumulation of 3.9 inches.
The least rain falls around January 24, with an average total accumulation of 2.2 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. Randolph experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 5.1 months, from November 9 to April 12, 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 0.9 inches.
The snowless period of the year lasts for 6.9 months, from April 12 to November 9. The least snow falls around July 20, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Randolph varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 6 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 5:07 AM on June 15, and the latest sunrise is 2 hours, 12 minutes later at 7:19 AM on November 3. The earliest sunset is at 4:12 PM on December 9, and the latest sunset is 4 hours, 12 minutes later at 8:24 PM on June 27.
Daylight saving time (DST) is observed in Randolph 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
Randolph experiences significant seasonal variation in the perceived humidity.
The muggier period of the year lasts for 3.5 months, from June 9 to September 24, during which time the comfort level is muggy, oppressive, or miserable at least 10% of the time. The muggiest day of the year is July 30, with muggy conditions 40% of the time.
The least muggy day of the year is February 24, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed in Randolph experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 6.0 months, from October 24 to April 23, with average wind speeds of more than 7.0 miles per hour. The windiest day of the year is February 23, with an average hourly wind speed of 9.1 miles per hour.
The calmer time of year lasts for 6.0 months, from April 23 to October 24. The calmest day of the year is August 2, with an average hourly wind speed of 5.0 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Randolph varies throughout the year.
The wind is most often from the south for 1.4 weeks, from May 13 to May 23 and for 1.7 weeks, from September 6 to September 18, with a peak percentage of 31% on May 21. The wind is most often from the west for 3.4 months, from May 23 to September 6 and for 7.8 months, from September 18 to May 13, with a peak percentage of 40% on July 8.
Randolph 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 28, with an average temperature above 61°F. The day of the year with the warmest water is August 6, with an average temperature of 67°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 Randolph 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 Randolph for general outdoor tourist activities is from mid June to mid September, with a peak score in the last 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 Randolph for hot-weather activities is from early July to late August, with a peak score in the last week of July.
The growing season in Randolph typically lasts for 6.3 months (192 days), from around April 15 to around October 24, rarely starting before March 30 or after April 30, and rarely ending before October 6 or after November 12.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Randolph should appear around April 20, only rarely appearing before April 4 or after May 2.
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 20, 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 6.9 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 2.7 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 Randolph are 42.163 deg latitude, -71.041 deg longitude, and 180 ft elevation.
The topography within 2 miles of Randolph contains only modest variations in elevation, with a maximum elevation change of 177 feet and an average elevation above sea level of 170 feet. Within 10 miles contains only modest variations in elevation (620 feet). Within 50 miles contains significant variations in elevation (2,031 feet).
The area within 2 miles of Randolph is covered by artificial surfaces (89%), within 10 miles by artificial surfaces (64%) and trees (28%), and within 50 miles by trees (37%) and water (35%).
This report illustrates the typical weather in Randolph, 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 Randolph.
For each station, the records are corrected for the elevation difference between that station and Randolph 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 Randolph is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Randolph and a given station.
Time zones for aiports and weather stations are provided by AskGeo.com .