Climate and monthly weather forecastCharlestown, MA
Climate and monthly weather forecast
Weather in January
January, like December, in Charlestown, Massachusetts, is an icy winter month, with an average temperature varying between 22.5°F (-5.3°C) and 33.8°F (1°C). Temperature records mark January as the coldest month, with highs averaging 33.8°F (1°C) and lows at 22.5°F (-5.3°C). Weather in January »Weather in February
February, the last month of the winter in Charlestown, is also an icy month, with temperature in the range of an average high of 36.5°F (2.5°C) and an average low of 23.4°F (-4.8°C). February denotes a minimal variation in the average high-temperature to a still wintry 36.5°F (2.5°C) from January's 33.8°F (1°C). Weather in February »Weather in March
The first month of the spring, March, is a chilly month in Charlestown, Massachusetts, with an average temperature fluctuating between 43.3°F (6.3°C) and 30.6°F (-0.8°C). Charlestown's weather shows a minor temperature rise with the arrival of March, moving from an icy 36.5°F (2.5°C) in February to a frosty 43.3°F (6.3°C). Weather in March »Weather in April
April is a mild spring month in Charlestown, Massachusetts, with an average temperature ranging between max 55.6°F (13.1°C) and min 40.1°F (4.5°C). April's onset brings a rise in the average high-temperature, moving from a frosty 43.3°F (6.3°C) in March to a mild 55.6°F (13.1°C). Weather in April »Weather in May
May, the last month of the spring in Charlestown, is a refreshing month, with an average temperature fluctuating between 49.8°F (9.9°C) and 66.7°F (19.3°C). The shift from April to May is marked by an increase in the average high-temperature, moving from a moderate 55.6°F (13.1°C) to an enjoyable 66.7°F (19.3°C). Weather in May »Weather in June
June, the first month of the summer in Charlestown, is a moderately hot month, with an average temperature ranging between max 74.5°F (23.6°C) and min 57.4°F (14.1°C). In June, the average high-temperature marginally rises from an enjoyable 66.7°F (19.3°C) in May to a moderately hot 74.5°F (23.6°C). Weather in June »Weather in July
July, like June, in Charlestown, Massachusetts, is a moderately hot summer month, with an average temperature varying between 64.8°F (18.2°C) and 81.9°F (27.7°C). July registers as the month with the highest average temperatures, reaching 81.9°F (27.7°C) at its peak and 64.8°F (18.2°C) at the lowest. The heat index for July is computed to be a tropical 86°F (30°C). Weather in July »Weather in August
August, the last month of the summer in Charlestown, is also a moderately hot month, with an average temperature ranging between max 80.4°F (26.9°C) and min 63.5°F (17.5°C). Charlestown's average high-temperature marks a still warm 80.4°F (26.9°C) with the advent of August, closely mirroring that of the preceding month. Weather in August »Weather in September
September, the first month of the autumn in Charlestown, is still a pleasant month, with temperature in the range of an average low of 56.8°F (13.8°C) and an average high of 72.9°F (22.7°C). September witnesses a gentle descent in average high-temperature, descending from August's moderately hot 80.4°F (26.9°C) to an agreeable 72.9°F (22.7°C). Weather in September »Weather in October
October, the same as September, is another refreshing autumn month in Charlestown, Massachusetts, with temperature in the range of an average high of 61.2°F (16.2°C) and an average low of 47.7°F (8.7°C). Onset of October comes with a temperature decline, the average high falling from a pleasant 72.9°F (22.7°C) in September to an enjoyable 61.2°F (16.2°C). Weather in October »Weather in November
The last month of the autumn, November, is also a frosty month in Charlestown, Massachusetts, with an average temperature fluctuating between 49.5°F (9.7°C) and 37.4°F (3°C). The onset of November is marked by a decrease in temperature, transitioning from a refreshing 61.2°F (16.2°C) in October to a chilly 49.5°F (9.7°C). Weather in November »Weather in December
December, the first month of the winter in Charlestown, is also an icy month, with temperature in the range of an average low of 29.3°F (-1.5°C) and an average high of 39.6°F (4.2°C). The transition into December is accompanied by a temperature decrease, with the average high-temperature shifting from a chilly 49.5°F (9.7°C) in November to a wintry 39.6°F (4.2°C). Weather in December »Updated: Jun 24, 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
January, with its high-temperature average of 33.8°F (1°C) and a low-temperature average of 22.5°F (-5.3°C), is the coldest month.
In Charlestown, during the entire year, the rain falls for 47.8 days and collects up to 4.13" (105mm) of precipitation.
January through May, November and December are months with snowfall.
In Charlestown, during the entire year, snow falls for 13.2 days and aggregates up to 2.17" (55mm) of snow.
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2.
With an average relative humidity of 78%, February is the most humid month.
February has the least sunshine of the year, 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.
June through October are months without snowfall.
The month with the longest days is June, with an average of 15h and 12min of daylight.
The months with the highest UV index are June through August, with an average maximum UV index of 6.
July is the warmest month, with an average high-temperature of 81.9°F (27.7°C) and an average low-temperature of 64.8°F (18.2°C).
With an average of 10.5h of sunshine, August has the most sunshine of the year.
The month with the least rainfall in Charlestown is September, when the rain falls for 2.9 days and typically collects 0.12" (3mm) of precipitation.
The month with the most rainfall is November, when the rain falls for 3.3 days and typically aggregates up to 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.
December has the shortest days of the year, with an average of 9h and 6min of daylight.
Average temperature
Charlestown, 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
Charlestown, 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
Charlestown, 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
Charlestown, MA
The month with the highest relative humidity is February (78%).
The month with the lowest relative humidity is April (69%).
Average rainfall
Charlestown, 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
Charlestown, 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
Charlestown, 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
Charlestown, 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
Charlestown, 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
Charlestown, 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
Charlestown, 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
Charlestown, 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
Charlestown, 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).
