Climate and monthly weather forecastSomerville, MA
Climate and monthly weather forecast
The climate of Somerville
Unlike some cities, the climate in Somerville, Massachusetts, USA is not always what you'd expect from its location in the northeastern United States. Instead of being humid but mild, the city actually experiences what is known as a humid continental climate (Köppen climate designation Dfa), characterized by its lack of a dry season and hot summers. This means that throughout the year, weather conditions vary significantly from month to month.Analyzing the yearly climate data, the most notable variations occur in temperature and rainfall. Average high temperatures range from 33.8°F (1°C) in January to a warm 81.9°F (27.7°C) in July, while average low temperatures can dip as low as 22.5°F (-5.3°C) in January and rise to 64.8°F (18.2°C) come July. This wide temperature disparity creates various weather patterns that differ each season.
In terms of precipitation, Somerville sees a fair amount of rainfall and snowfall throughout the year. The city gets the most rainfall in November, with the average reaching 0.55" (14mm) and the least in September, at 0.12" (3mm). Further, snowfall in Somerville is more common than one might think, with the deepest snow, 0.71" (18mm) on average, happening in December.
Humidity levels stay relatively constant hovering between 69% in April and 78% in February. Sunshine hours are greatest during summer and least during winter, with the annual average daylight reaching 15.2 hours in June and as short as 9.1 hours in December.
The best time to visit Somerville
Taking into account the city's unique climate conditions, the best time to visit Somerville may vary depending on what a visitor is after. If warm and comfortable weather is a priority, June to August offers the most appealing conditions. During this time, high temperatures average between 72.9°F (22.7°C) to 81.9°F (27.7°C) while average low temperatures range from 57.4°F (14.1°C) to 64.8°F (18.2°C). Additionally, summer sees the longest daylight periods reaching up to 15.2 hours in June, ensuring plenty of daylight for outdoor activities.The worst time to visit Somerville
On the other end of the spectrum, January and February may not be ideal for a visit to Somerville, especially for those not accustomed to colder climates. Low temperatures during this time can drop to a chilly 22.5°F (-5.3°C) in January and 23.4°F (-4.8°C) in February. These months also see the least amount of daylight, averaging 9.5 hours in January and 10.6 hours in February, respectively. Furthermore, January sees the highest average snowfall, turning the city into a winter wonderland.Spring weather in Somerville
Springtime in Somerville sees a gradual rise in temperatures as the city shakes off winter's chill. March to May witnesses average high temperatures rise from 43.3°F (6.3°C) to 66.7°F (19.3°C), while low temperatures increase from 30.6°F (-0.8°C) to 49.8°F (9.9°C). Humidity levels also start to increase during spring, going up to 72% in May from 69% in April. However, rainfall levels rise as well, peaking at 0.47" (12mm) in April.Summer weather in Somerville
The transition from spring to summer brings warmer weather to Somerville, with average high temperatures peaking at 81.9°F (27.7°C) in July and average lows rising to 64.8°F (18.2°C). The summer months of June to August also witness the least cloud cover, encouraging maximum sunshine. Humidity remains relatively consistent, fluctuating between 73% - 74%. Rainfall also tends to be less during this period, averaging between 0.24" (6mm) to 0.35" (9mm).Autumn weather in Somerville
As summer transitions into autumn, temperatures in Somerville start to dip. The months from September to November see average highs decrease from 72.9°F (22.7°C) to 49.5°F (9.7°C), while average lows fall from 56.8°F (13.8°C) to 37.4°F (3°C). Despite the decreasing temperatures, the amount of rainfall increases, reaching a high of 0.55" (14mm) in November.Winter weather in Somerville
Winter reigns in Somerville from December to February. During this period, the city experiences its coldest temperatures with average highs falling to 33.8°F (1°C) in January and average lows plummeting to 22.5°F (-5.3°C). Additionally, snowfall is most common in winter, reaching its peak depth of 0.71" (18mm) in December. Despite the colder weather, the pressure tends to be the highest, averaging 30.03" (763mm) in February. While the winter may be cold, the crisp air, and snow-covered cityscape provides an entirely different charm to Somerville.Weather in January
January brings to Somerville Massachusetts the feel of a true winter atmosphere. Freezing cold temperatures are the norm, with an average low temperature touching 22.5°F (-5.3°C) and high peaking at 33.8°F (1°C). This period can be particularly challenging for outdoor activities with the peak winters and icy winds. Weather in January »Weather in February
February in Somerville Massachusetts witnesses a gradual rise in temperature into the high of 36.5°F (2.5°C) from the previous month, though the chill of winter is very much still present. The city braces itself against the ongoing onslaught of winter breezes. Weather in February »Weather in March
March sees the commencement of Spring in Somerville Massachusetts with the temperatures starting to climb. Featuring a high of 43.3°F (6.3°C), the weather is still chilly but much less harsh compared to the severe winters experienced in January and February. Weather in March »Weather in April
April in Somerville Massachusetts is characterized by a significant increase in temperature from March, making it a relatively pleasant month. The city disturbs its winter slumber with rising temperatures as it ushers in the warmer months of the year. Weather in April »Weather in May
Somerville Massachusetts weather in May is marked by a temperature high hitting 66.7°F (19.3°C), signaling the advent of the summer months. May presents itself as one of the ideal months for outdoor activities with extended daylight hours and warm weather. Weather in May »Weather in June
June represents the onset of Summer in Somerville Massachusetts with temperatures reaching a warm 74.5°F (23.6°C). The increase in humidity continues into this month from May. Being the month of Summer Solstice, June has long, sunny days with maximum daylight hours. Weather in June »Weather in July
July is the peak of summer in Somerville Massachusetts, with temperatures soaring to a sizzling 81.9°F (27.7°C). The weather is significantly warmer compared to previous months. Long hot days with lower cloud cover create an environment ripe for various summer activities. Weather in July »Weather in August
Despite a slight dip, August clings on to July's remnants of heat in Somerville Massachusetts as the summer season gradually comes to an end. With highs of approximately 80.4°F (26.9°C), it is still a month of warm and sunny days. Weather in August »Weather in September
September in Somerville Massachusetts sees the dawn of the fall season, with a noticeable drop in the highest temperature to 72.9°F (22.7°C) and the beginning of autumn colors. The winds start to pick up in frequency in comparison to the calm summer months. Weather in September »Weather in October
With a high-temperature drop to 61.2°F (16.2°C), October ushers in the full effect of the fall season in Somerville Massachusetts. The fall foliage starts to become more pronounced this month. The weather is significantly cooler compared to previous months, and the colorful autumn scenery envelops the city. Weather in October »Weather in November
November in Somerville Massachusetts brings along colder temperatures, leading up to the arrival of winter. The temperature lowers to an average high of 49.5°F (9.7°C) from the previous month, signaling the decreasing warmth. Weather in November »Weather in December
December announces the arrival of winter in Somerville Massachusetts with an average high temperature of 39.6°F (4.2°C). It's a month of significant transformation as the city prepares to move from fall to the coldest season of the year. Weather in December »Updated: Jun 4, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
With average temperatures fluctuating between a high of 33.8°F (1°C) and a low of 22.5°F (-5.3°C), January stands out as the coldest month.
Throughout the year, there are 47.8 rainfall days, and 4.13" (105mm) of precipitation is accumulated.
Months with snowfall are January through May, November and December.
Throughout the year, there are 13.2 snowfall days, and 2.17" (55mm) of snow is accumulated.
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2.
The most humid month is February, with an average relative humidity of 78%.
The month with the least sunshine is February, with an average of 4.6h of sunshine.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
With an average relative humidity of 69%, April is the least humid month.
In Somerville, snow does not fall in June through October.
With an average of 15h and 12min of daylight, June has the longest days of the year.
June through August, with an average maximum UV index of 6, are months with the highest UV index.
The month of July, characterized by an average high of 81.9°F (27.7°C) and a low of 64.8°F (18.2°C), is recognized as the warmest.
The month with the most sunshine is August, with an average of 10.5h of sunshine.
September is the month with the least rainfall in Somerville. Rain falls for 2.9 days and accumulates 0.12" (3mm) of precipitation.
November is the month with the most rainfall in Somerville. Rain falls for 3.3 days and accumulates 0.55" (14mm) of precipitation.
The month with the most snowfall is December, when snow falls for 2.4 days and typically aggregates up to 0.71" (18mm) of snow.
With an average of 9h and 6min of daylight, December has the shortest days of the year.
Average temperature
Somerville, MA
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (33.8°F).
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).
Average pressure
Somerville, MA
- Average pressure in January:
30.01"Hg - Average pressure in February:
29.99"Hg - Average pressure in March:
30.03"Hg - Average pressure in April:
29.97"Hg - Average pressure in May:
30.01"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.94"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.05"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.06"Hg - Average pressure in December:
30.03"Hg
The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Somerville, MA
- Average wind speed in January:
9.6mph - Average wind speed in February:
9.4mph - Average wind speed in March:
9.1mph - Average wind speed in April:
8.5mph - Average wind speed in May:
7.2mph - Average wind speed in June:
6.6mph
The windiest month (with the highest average wind speed) is January (9.6mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity
Somerville, MA
The month with the highest relative humidity is February (78%).
The month with the lowest relative humidity is April (69%).
Average rainfall
Somerville, MA
- Average rainfall in January:
0.35" - Average rainfall in February:
0.31" - Average rainfall in March:
0.35" - Average rainfall in April:
0.47" - Average rainfall in May:
0.28" - Average rainfall in June:
0.35"
- Average rainfall in July:
0.28" - Average rainfall in August:
0.24" - Average rainfall in September:
0.12" - Average rainfall in October:
0.39" - Average rainfall in November:
0.55" - Average rainfall in December:
0.43"
The wettest month (with the highest rainfall) is November (0.55").
The driest month (with the least rainfall) is September (0.12").
Average rainfall days
Somerville, MA
- Average rainfall days in January:
2.9 days - Average rainfall days in February:
3 days - Average rainfall days in March:
4.8 days - Average rainfall days in April:
5.9 days - Average rainfall days in May:
4.3 days - Average rainfall days in June:
4.2 days
- Average rainfall days in July:
5 days - Average rainfall days in August:
4.4 days - Average rainfall days in September:
2.9 days - Average rainfall days in October:
4 days - Average rainfall days in November:
3.3 days - Average rainfall days in December:
3.1 days
The month with the highest number of rainy days is April (5.9 days).
The months with the least rainy days are January and September (2.9 days).
Average snowfall
Somerville, MA
- Average snowfall in January:
0.2" - Average snowfall in February:
0.43" - Average snowfall in March:
0.59" - Average snowfall in April:
0.04" - Average snowfall in May:
0.04" - Average snowfall in June:
0"
The month with the highest snowfall is December (0.71").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days
Somerville, MA
- Average snowfall days in January:
3.4 days - Average snowfall days in February:
3.2 days - Average snowfall days in March:
2.7 days - Average snowfall days in April:
0.6 days - Average snowfall days in May:
0.1 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.1 days - Average snowfall days in November:
0.7 days - Average snowfall days in December:
2.4 days
The month with the highest number of snowfall days is January (3.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Somerville, MA
- Average daylight in January:
9h and 30min - Average daylight in February:
10h and 36min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 36min - Average daylight in June:
15h and 12min
- Average daylight in July:
14h and 54min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 48min - Average daylight in December:
9h and 6min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in January:
5h and 12min - Average sunshine in February:
4h and 36min - Average sunshine in March:
5h and 48min - Average sunshine in April:
8h and 6min - Average sunshine in May:
8h and 24min - Average sunshine in June:
9h and 12min
- Average sunshine in July:
10h and 12min - Average sunshine in August:
10h and 30min - Average sunshine in September:
8h and 30min - Average sunshine in October:
6h and 0min - Average sunshine in November:
5h and 30min - Average sunshine in December:
4h and 54min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days
Somerville, MA
- Average sunshine days in January:
25 days - Average sunshine days in February:
23.3 days - Average sunshine days in March:
25 days - Average sunshine days in April:
23.3 days - Average sunshine days in May:
24.3 days - Average sunshine days in June:
23.4 days
- Average sunshine days in July:
22.8 days - Average sunshine days in August:
24.1 days - Average sunshine days in September:
24.8 days - Average sunshine days in October:
25 days - Average sunshine days in November:
24.4 days - Average sunshine days in December:
25.5 days
The month with the most sunshine days is December (25.5 days).
The month with the least sunshine days is July (22.8 days).
Average UV index
Somerville, MA
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover
Somerville, MA
The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility
Somerville, MA
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
