Climate and monthly weather forecastSullivan, NH
Climate and monthly weather forecast
Weather in January
January, the same as December, in Sullivan, New Hampshire, is another subzero cold winter month, with an average temperature ranging between max 27.9°F (-2.3°C) and min 15.1°F (-9.4°C). With average high and low temperatures of 27.9°F (-2.3°C) and 15.1°F (-9.4°C) respectively, January is Sullivan's coldest month. Weather in January »Weather in February
The last month of the winter, February, is another freezing cold month in Sullivan, New Hampshire, with an average temperature ranging between min 16.5°F (-8.6°C) and max 31.1°F (-0.5°C). February's arrival registers an average high-temperature of a still subzero cold 31.1°F (-0.5°C), closely aligning with the temperature of the previous month. Weather in February »Weather in March
The first month of the spring, March, is an icy month in Sullivan, New Hampshire, with an average temperature ranging between min 24.3°F (-4.3°C) and max 39.4°F (4.1°C). The beginning of March marks a minor shift in the average high-temperature, moving from February's freezing cold 31.1°F (-0.5°C) to a wintry 39.4°F (4.1°C). Weather in March »Weather in April
April is a fresh spring month in Sullivan, New Hampshire, with temperature in the range of an average low of 35.1°F (1.7°C) and an average high of 52.9°F (11.6°C). With the beginning of April, Sullivan's average high-temperature sees an increase, transitioning from a wintry 39.4°F (4.1°C) in March to a fresh 52.9°F (11.6°C). Weather in April »Weather in May
The last month of the spring, May, is a refreshing month in Sullivan, New Hampshire, with an average temperature ranging between max 66°F (18.9°C) and min 45.3°F (7.4°C). The average high-temperature increases in May, moving from a cool 52.9°F (11.6°C) in April to a comfortable 66°F (18.9°C). Weather in May »Weather in June
The first month of the summer, June, is an agreeable month in Sullivan, New Hampshire, with an average temperature fluctuating between 52.5°F (11.4°C) and 73.2°F (22.9°C). Entering June, Sullivan notices a subtle temperature elevation, with the average high-temperature advancing from May's enjoyable 66°F (18.9°C) to a pleasant 73.2°F (22.9°C). Weather in June »Weather in July
July in Sullivan, New Hampshire, is a moderately hot summer month, with an average temperature ranging between min 58.6°F (14.8°C) and max 79.9°F (26.6°C). July, with average temperatures reaching a high of 79.9°F (26.6°C) and a low of 58.6°F (14.8°C), is the warmest month. Weather in July »Weather in August
August, the last month of the summer in Sullivan, is also a moderately hot month, with an average temperature varying between 78.1°F (25.6°C) and 56.8°F (13.8°C). The advent of August sees the average high-temperature at a still warm 78.1°F (25.6°C), subtly shifted from July's 79.9°F (26.6°C). Weather in August »Weather in September
September, the first month of the autumn in Sullivan, is still a pleasant month, with an average temperature fluctuating between 70°F (21.1°C) and 50.9°F (10.5°C). As August shifts into September, a minor alteration in temperatures is observed, with average highs reducing from a warm 78.1°F (25.6°C) to a pleasant 70°F (21.1°C). Weather in September »Weather in October
October, like September, is a moderate autumn month in Sullivan, New Hampshire, with temperature in the range of an average low of 42.1°F (5.6°C) and an average high of 56.8°F (13.8°C). October comes with a drop in the average high-temperature, falling from September's pleasant 70°F (21.1°C) to a mild 56.8°F (13.8°C). Weather in October »Weather in November
November, the last month of the autumn in Sullivan, is another chilly month, with an average temperature ranging between max 44.4°F (6.9°C) and min 31.3°F (-0.4°C). The average high-temperature drops in November, from October's refreshing 56.8°F (13.8°C) to a chilly 44.4°F (6.9°C). Weather in November »Weather in December
The first month of the winter, December, is also an icy month in Sullivan, New Hampshire, with an average temperature varying between 33.4°F (0.8°C) and 22.8°F (-5.1°C). The onset of December introduces a moderate change in Sullivan's weather, with average high-temperatures falling from November's chilly 44.4°F (6.9°C) to a cold 33.4°F (0.8°C). 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
In Sullivan, January is the coldest month, with temperatures averaging a high of 27.9°F (-2.3°C) and a low of 15.1°F (-9.4°C).
Throughout the year, there are 125.1 rainfall days, and 11.69" (297mm) of precipitation is accumulated.
Months with snowfall are January through May, October through December.
The month with the most snowfall is January, when snow falls for 9.2 days and typically aggregates up to 2.64" (67mm) of snow.
In Sullivan, during the entire year, snow falls for 39.8 days and aggregates up to 10.2" (259mm) of snow.
The months with the lowest UV index are January through March, October through December, with an average maximum UV index of 2.
February is the most humid month, with an average relative humidity of 85%.
February has the least sunshine of the year, with an average of 4.4h of sunshine.
The month with the least rainfall is March, when the rain falls for 10 days and typically collects 0.75" (19mm) of precipitation.
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.
April is the least humid month, with an average relative humidity of 74%.
In Sullivan, snow does not fall in June through September.
With an average of 15h and 18min of daylight, June has the longest days of the year.
In Sullivan, temperatures reach their average annual highs in July, measuring 79.9°F (26.6°C) and a minimum average of 58.6°F (14.8°C).
The month with the most rainfall is July, when the rain falls for 13.3 days and typically aggregates up to 1.3" (33mm) of precipitation.
With an average maximum UV index of 6, July is the month with the highest UV index.
With an average of 10.3h of sunshine, August has the most sunshine of the year.
December has the shortest days of the year, with an average of 9h and 6min of daylight.
Average temperature
Sullivan, NH
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (27.9°F).
The month with the highest average low temperature is July (58.6°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).
Average pressure
Sullivan, NH
- Average pressure in January:
30.02"Hg - Average pressure in February:
30"Hg - Average pressure in March:
30.04"Hg - Average pressure in April:
29.96"Hg - Average pressure in May:
30"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.94"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.05"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.08"Hg - Average pressure in December:
30.04"Hg
The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Sullivan, NH
- Average wind speed in January:
7.9mph - Average wind speed in February:
7.9mph - Average wind speed in March:
7.9mph - Average wind speed in April:
7.7mph - Average wind speed in May:
6.4mph - Average wind speed in June:
5.7mph
- Average wind speed in July:
5.3mph - Average wind speed in August:
5.1mph - Average wind speed in September:
5.4mph - Average wind speed in October:
6.5mph - Average wind speed in November:
6.9mph - Average wind speed in December:
7.3mph
The windiest months (with the highest average wind speed) are January, February and March (7.9mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity
Sullivan, NH
The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is April (74%).
Average rainfall
Sullivan, NH
- Average rainfall in January:
0.83" - Average rainfall in February:
0.79" - Average rainfall in March:
0.75" - Average rainfall in April:
0.98" - Average rainfall in May:
1.14" - Average rainfall in June:
1.18"
- Average rainfall in July:
1.3" - Average rainfall in August:
0.94" - Average rainfall in September:
0.79" - Average rainfall in October:
1.18" - Average rainfall in November:
0.94" - Average rainfall in December:
0.87"
The wettest month (with the highest rainfall) is July (1.3").
The driest month (with the least rainfall) is March (0.75").
Average rainfall days
Sullivan, NH
- Average rainfall days in January:
6.3 days - Average rainfall days in February:
6.6 days - Average rainfall days in March:
10 days - Average rainfall days in April:
12.5 days - Average rainfall days in May:
14.6 days - Average rainfall days in June:
13.8 days
- Average rainfall days in July:
13.3 days - Average rainfall days in August:
12 days - Average rainfall days in September:
9.3 days - Average rainfall days in October:
11.2 days - Average rainfall days in November:
7.8 days - Average rainfall days in December:
7.7 days
The month with the highest number of rainy days is May (14.6 days).
The month with the least rainy days is January (6.3 days).
Average snowfall
Sullivan, NH
- Average snowfall in January:
2.64" - Average snowfall in February:
2.44" - Average snowfall in March:
1.42" - Average snowfall in April:
0.79" - Average snowfall in May:
0.16" - Average snowfall in June:
0"
The month with the highest snowfall is January (2.64").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Sullivan, NH
- Average snowfall days in January:
9.2 days - Average snowfall days in February:
9.4 days - Average snowfall days in March:
8.3 days - Average snowfall days in April:
1.8 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:
0.6 days - Average snowfall days in November:
3 days - Average snowfall days in December:
7.4 days
The month with the highest number of snowfall days is February (9.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Sullivan, NH
- Average daylight in January:
9h and 24min - 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 42min - Average daylight in June:
15h and 18min
- Average daylight in July:
15h and 0min - Average daylight in August:
13h and 54min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 42min - Average daylight in December:
9h and 6min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in January:
4h and 54min - Average sunshine in February:
4h and 24min - Average sunshine in March:
5h and 42min - Average sunshine in April:
8h and 0min - Average sunshine in May:
8h and 24min - Average sunshine in June:
9h and 12min
- Average sunshine in July:
10h and 0min - Average sunshine in August:
10h and 18min - Average sunshine in September:
8h and 30min - Average sunshine in October:
5h and 36min - Average sunshine in November:
5h and 24min - Average sunshine in December:
4h and 48min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).
Average sunshine days
Sullivan, NH
- Average sunshine days in January:
19.6 days - Average sunshine days in February:
15.6 days - Average sunshine days in March:
15.8 days - Average sunshine days in April:
15.2 days - Average sunshine days in May:
13.8 days - Average sunshine days in June:
14 days
- Average sunshine days in July:
15.2 days - Average sunshine days in August:
15.8 days - Average sunshine days in September:
17.2 days - Average sunshine days in October:
17 days - Average sunshine days in November:
20.2 days - Average sunshine days in December:
18.4 days
The month with the most sunshine days is November (20.2 days).
The month with the least sunshine days is May (13.8 days).
Average UV index
Sullivan, NH
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover
Sullivan, NH
The months with the most cloud cover are February and March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 35).
Average visibility
Sullivan, NH
The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).
