Climate and monthly weather forecastOnset, MA
Climate and monthly weather forecast
Weather in January
January, like December, in Onset, Massachusetts, is a wintry winter month, with an average temperature ranging between max 36.9°F (2.7°C) and min 27.7°F (-2.4°C). The coldest temperatures occur during January, when averages reach a peak of 36.9°F (2.7°C) and a low of 27.7°F (-2.4°C). Weather in January »Weather in February
February, the last month of the winter in Onset, is also an icy month, with temperature in the range of an average low of 28.6°F (-1.9°C) and an average high of 37.9°F (3.3°C). With the advent of February, Onset's high-temperatures adjust to a still cold 37.9°F (3.3°C), closely aligning with the preceding month. Weather in February »Weather in March
March, the first month of the spring in Onset, is also a wintry month, with an average temperature fluctuating between 33.8°F (1°C) and 42.3°F (5.7°C). As Onset welcomes March, the average high-temperature records at a still icy 42.3°F (5.7°C), marking an insignificant deviation from the prior month. Weather in March »Weather in April
April in Onset, Massachusetts, is a cool spring month, with temperature in the range of an average high of 50.5°F (10.3°C) and an average low of 41.9°F (5.5°C). April brings a slight rise in Onset's average high-temperature, moving from a wintry 42.3°F (5.7°C) in March to a cool 50.5°F (10.3°C). Weather in April »Weather in May
The last month of the spring, May, is a mild month in Onset, Massachusetts, with an average temperature ranging between min 50.7°F (10.4°C) and max 59.5°F (15.3°C). The onset of May brings a rise in the average high-temperature, elevating from a cool 50.5°F (10.3°C) in April to a moderate 59.5°F (15.3°C). Weather in May »Weather in June
June, the first month of the summer in Onset, is a comfortable month, with an average temperature ranging between max 67.6°F (19.8°C) and min 58.5°F (14.7°C). Onset's June weather indicates a minor increase in high-temperatures, edging from May's moderate 59.5°F (15.3°C) to a still refreshing 67.6°F (19.8°C). Weather in June »Weather in July
July is a warm summer month in Onset, Massachusetts, with an average temperature varying between 66.4°F (19.1°C) and 75.6°F (24.2°C). July, known for its average high temperature of 75.6°F (24.2°C) and an average low temperature of 66.4°F (19.1°C), is the warmest month. Weather in July »Weather in August
August, the last month of the summer in Onset, is another warm month, with an average temperature fluctuating between 75.2°F (24°C) and 66.7°F (19.3°C). In Onset, August's average high-temperature stands at a still warm 75.2°F (24°C), closely related to the preceding month. Weather in August »Weather in September
September, the first month of the autumn in Onset, is still a pleasant month, with an average temperature fluctuating between 68.9°F (20.5°C) and 61.2°F (16.2°C). September indicates a minor shift in the average high-temperature, from August's moderately hot 75.2°F (24°C) to an agreeable 68.9°F (20.5°C). Weather in September »Weather in October
October, the same as September, in Onset, Massachusetts, is another refreshing autumn month, with an average temperature ranging between max 60.1°F (15.6°C) and min 52.3°F (11.3°C). A minor decrease in the average high-temperature is observed during October, shifting from an agreeable 68.9°F (20.5°C) in September to a mild 60.1°F (15.6°C). Weather in October »Weather in November
The last month of the autumn, November, is another cool month in Onset, Massachusetts, with an average temperature fluctuating between 50.9°F (10.5°C) and 42.3°F (5.7°C). The commencement of November involves a temperature shift, with the average high-temperature dropping from a refreshing 60.1°F (15.6°C) in October to a cool 50.9°F (10.5°C). Weather in November »Weather in December
The first month of the winter, December, is also an icy month in Onset, Massachusetts, with an average temperature ranging between min 34.2°F (1.2°C) and max 42.4°F (5.8°C). The advent of December brings a slight shift in average high-temperature, moving from a cool 50.9°F (10.5°C) in November to a cold 42.4°F (5.8°C). Weather in December »Updated: Jul 25, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January is the coldest month, with an average high-temperature of 36.9°F (2.7°C) and an average low-temperature of 27.7°F (-2.4°C).
Throughout the year, there are 157.4 rainfall days, and 32.2" (818mm) of precipitation is accumulated.
January through April, October through December are months with snowfall.
In Onset, during the entire year, snow falls for 21.7 days and aggregates up to 8.43" (214mm) of snow.
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
The months with the most snowfall are February and March, with an average 2.28" (58mm) of accumulated snow.
With an average ocean temperature of 38.1°F (3.4°C), February is the month with the coldest seawater.
The months with the least sunshine are February and December, with an average of 4.8h of sunshine.
March and November, with an average relative humidity of 74%, are the least humid months.
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.
May through September are months without snowfall.
June and July, with an average relative humidity of 81%, are most humid months.
June has the longest days of the year, with an average of 15h and 12min of daylight.
July is the warmest month, exhibiting average temperatures of 75.6°F (24.2°C) at the peak and 66.4°F (19.1°C) at the base.
July and August, with an average maximum UV index of 6, are months with the highest UV index.
With an average ocean temperature of 68.5°F (20.3°C), August is the month with the warmest seawater.
With an average of 10.7h of sunshine, August has the most sunshine of the year.
The month with the least rainfall is September, when the rain falls for 12.3 days and typically collects 1.81" (46mm) of precipitation.
December is the month with the most rainfall. Rain falls for 12.5 days and accumulates 3.58" (91mm) of precipitation.
With an average of 9h and 12min of daylight, December has the shortest days of the year.
Average temperature
Onset, MA
The warmest month (with the highest average high temperature) is July (75.6°F).
The month with the lowest average high temperature is January (36.9°F).
The month with the highest average low temperature is August (66.7°F).
The coldest month (with the lowest average low temperature) is January (27.7°F).
Average pressure
Onset, MA
- Average pressure in January:
30"Hg - Average pressure in February:
29.98"Hg - Average pressure in March:
30.02"Hg - Average pressure in April:
29.98"Hg - Average pressure in May:
30.01"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.95"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
Onset, MA
- Average wind speed in January:
13.7mph - Average wind speed in February:
13.3mph - Average wind speed in March:
13.3mph - Average wind speed in April:
11.7mph - Average wind speed in May:
10.1mph - Average wind speed in June:
9.4mph
- Average wind speed in July:
8.8mph - Average wind speed in August:
8.7mph - Average wind speed in September:
10.3mph - Average wind speed in October:
11.8mph - Average wind speed in November:
12.7mph - Average wind speed in December:
13mph
The windiest month (with the highest average wind speed) is January (13.7mph).
The calmest month (with the lowest average wind speed) is August (8.7mph).
Average humidity
Onset, MA
The months with the highest relative humidity are June and July (81%).
The months with the lowest relative humidity are March and November (74%).
Average rainfall
Onset, MA
- Average rainfall in January:
2.8" - Average rainfall in February:
2.48" - Average rainfall in March:
3.03" - Average rainfall in April:
3.03" - Average rainfall in May:
2.36" - Average rainfall in June:
2.52"
- Average rainfall in July:
2.52" - Average rainfall in August:
2.09" - Average rainfall in September:
1.81" - Average rainfall in October:
3.43" - Average rainfall in November:
2.56" - Average rainfall in December:
3.58"
The wettest month (with the highest rainfall) is December (3.58").
The driest month (with the least rainfall) is September (1.81").
Average rainfall days
Onset, MA
- Average rainfall days in January:
9 days - Average rainfall days in February:
9.7 days - Average rainfall days in March:
11.8 days - Average rainfall days in April:
15.9 days - Average rainfall days in May:
15.8 days - Average rainfall days in June:
14.7 days
- Average rainfall days in July:
16 days - Average rainfall days in August:
14.1 days - Average rainfall days in September:
12.3 days - Average rainfall days in October:
14.4 days - Average rainfall days in November:
11.2 days - Average rainfall days in December:
12.5 days
The month with the highest number of rainy days is July (16 days).
The month with the least rainy days is January (9 days).
Average snowfall
Onset, MA
The months with the highest snowfall are February and March (2.28").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Onset, MA
- Average snowfall days in January:
6 days - Average snowfall days in February:
5.5 days - Average snowfall days in March:
4.8 days - Average snowfall days in April:
0.8 days - Average snowfall days in May:
0 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:
1 days - Average snowfall days in December:
3.5 days
The month with the highest number of snowfall days is January (6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average sea temperature
Onset, MA
The best month for swimming (with the highest average sea temperature) is August (68.4°F).
The coldest month (with the lowest average sea temperature) is February (38.2°F).
Average daylight / Average sunshine
Onset, MA
- Average daylight in January:
9h and 36min - 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 6min - Average daylight in November:
9h and 48min - Average daylight in December:
9h and 12min
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 12min).
- Average sunshine in January:
5h and 6min - Average sunshine in February:
4h and 48min - Average sunshine in March:
6h and 0min - Average sunshine in April:
8h and 18min - Average sunshine in May:
8h and 36min - Average sunshine in June:
9h and 30min
- Average sunshine in July:
10h and 30min - Average sunshine in August:
10h and 42min - Average sunshine in September:
8h and 42min - Average sunshine in October:
6h and 30min - Average sunshine in November:
5h and 18min - Average sunshine in December:
4h and 48min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).
Average sunshine days
Onset, MA
- Average sunshine days in January:
15.8 days - Average sunshine days in February:
13.9 days - Average sunshine days in March:
13.8 days - Average sunshine days in April:
12.5 days - Average sunshine days in May:
13.3 days - Average sunshine days in June:
13.8 days
- Average sunshine days in July:
13.2 days - Average sunshine days in August:
14.3 days - Average sunshine days in September:
15.4 days - Average sunshine days in October:
14.6 days - Average sunshine days in November:
16.3 days - Average sunshine days in December:
15.6 days
The month with the most sunshine days is November (16.3 days).
The month with the least sunshine days is April (12.5 days).
Average UV index
Onset, MA
The months with the highest UV index are 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
Onset, MA
The month with the most cloud cover is March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility
Onset, 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).
