Climate and monthly weather forecastChatham, NH
Climate and monthly weather forecast
Weather in January
January, like December, is a freezing cold winter month in Chatham, New Hampshire, with an average temperature fluctuating between 10.4°F (-12°C) and 24.4°F (-4.2°C). January, characterized by an average high temperature of 24.4°F (-4.2°C) and a low temperature of 10.4°F (-12°C), is generally the coldest month. Weather in January »Weather in February
February, the last month of the winter in Chatham, is another freezing cold month, with an average temperature ranging between max 26.8°F (-2.9°C) and min 11.7°F (-11.3°C). The shift into February uncovers an average high-temperature of a still freezing cold 26.8°F (-2.9°C), subtly different from the previous month. Weather in February »Weather in March
The first month of the spring, March, is a cold month in Chatham, New Hampshire, with an average temperature ranging between min 19.8°F (-6.8°C) and max 35.6°F (2°C). The start of March brings a subtle rise in the average high-temperature, moving from a freezing cold 26.8°F (-2.9°C) in February to a wintry 35.6°F (2°C). Weather in March »Weather in April
April in Chatham, New Hampshire, is a chilly spring month, with temperature in the range of an average low of 31.1°F (-0.5°C) and an average high of 48.6°F (9.2°C). In Chatham, the average high-temperature in April rises, from a wintry 35.6°F (2°C) in March, to a chilly 48.6°F (9.2°C). Weather in April »Weather in May
The last month of the spring, May, is a refreshing month in Chatham, New Hampshire, with an average temperature ranging between min 42.4°F (5.8°C) and max 63.1°F (17.3°C). As May arrives, Chatham's weather displays a notable increase in high-temperatures, climbing from April's chilly 48.6°F (9.2°C) to a refreshing 63.1°F (17.3°C). Weather in May »Weather in June
The first month of the summer, June, is a pleasant month in Chatham, New Hampshire, with an average temperature fluctuating between 70°F (21.1°C) and 48.9°F (9.4°C). June comes with a subtle rise, with the average high-temperature adjusting from a refreshing 63.1°F (17.3°C) in May to a pleasant 70°F (21.1°C). Weather in June »Weather in July
July is a warm summer month in Chatham, New Hampshire, with an average temperature fluctuating between 76.8°F (24.9°C) and 55.8°F (13.2°C). The average temperatures reach their apex in July, averaging 76.8°F (24.9°C) at the high end and 55.8°F (13.2°C) at the low end. Weather in July »Weather in August
August, the last month of the summer in Chatham, is another warm month, with temperature in the range of an average high of 75.9°F (24.4°C) and an average low of 53.2°F (11.8°C). The beginning of August records an average high-temperature of a still warm 75.9°F (24.4°C), marking a negligible difference from July's 76.8°F (24.9°C). Weather in August »Weather in September
The first month of the autumn, September, is still a pleasant month in Chatham, New Hampshire, with an average temperature fluctuating between 47.5°F (8.6°C) and 68.5°F (20.3°C). As Chatham, New Hampshire, enters September, the average high-temperature subtly lowers from the a moderately hot 75.9°F (24.4°C) of August to an agreeable 68.5°F (20.3°C). Weather in September »Weather in October
October, the same as September, is another fresh autumn month in Chatham, New Hampshire, with an average temperature varying between 54°F (12.2°C) and 38.7°F (3.7°C). The transition from September to October brings a clear temperature drop, with average high-temperatures decreasing from a pleasant 68.5°F (20.3°C) to a cool 54°F (12.2°C). Weather in October »Weather in November
November, the last month of the autumn in Chatham, is also a wintry month, with an average temperature varying between 27.7°F (-2.4°C) and 40.8°F (4.9°C). In Chatham, the average high-temperature in November drops from a fresh 54°F (12.2°C) in October to a wintry 40.8°F (4.9°C). Weather in November »Weather in December
December, the first month of the winter in Chatham, is still a freezing cold month, with an average temperature varying between 29.8°F (-1.2°C) and 18.9°F (-7.3°C). The arrival of December signals a shift in temperature, down from an icy 40.8°F (4.9°C) in November to a freezing cold 29.8°F (-1.2°C). Weather in December »Updated: Feb 13, 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
The lowest temperatures are recorded in January, with averages reaching a high of 24.4°F (-4.2°C) and a low of 10.4°F (-12°C).
In Chatham, during the entire year, the rain falls for 158 days and collects up to 18.58" (472mm) of precipitation.
Months with snowfall are January through May, October through December.
Throughout the year, there are 64.6 snowfall days, and 25.31" (643mm) of snow is accumulated.
January through April, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Chatham, New Hampshire.
February is the most humid month in Chatham, with an average relative humidity of 87%.
February is the month with the most snowfall in Chatham, New Hampshire. Snow falls for 14.5 days and accumulates 6.73" (171mm) of snow.
February has the least sunshine of the year, with an average of 4.3h of sunshine.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Chatham, 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.
The wettest months in Chatham, New Hampshire, are April and October, with an average 2.17" (55mm) of rainfall.
The months with the lowest humidity in Chatham, New Hampshire, are May and November, with an average relative humidity of 77%.
In Chatham, snow does not fall in June through September.
June has the longest days of the year in Chatham, New Hampshire, with an average of 15h and 30min of daylight.
June through August, with an average maximum UV index of 5, are months with the highest UV index in Chatham, New Hampshire.
Chatham experiences its highest temperatures in July, with an average peak of 76.8°F (24.9°C) and a low of 55.8°F (13.2°C).
With an average of 10.1h of sunshine, August has the most sunshine of the year in Chatham, New Hampshire.
September is the month with the least rainfall in Chatham. Rain falls for 10.3 days and accumulates 0.94" (24mm) of precipitation.
The month with the shortest days is December, with an average of 8h and 54min of daylight.
Average temperature
Chatham, NH
The warmest month (with the highest average high temperature) is July (76.8°F).
The month with the lowest average high temperature is January (24.4°F).
The month with the highest average low temperature is July (55.8°F).
The coldest month (with the lowest average low temperature) is January (10.4°F).
Average pressure
Chatham, NH
- Average pressure in January:
29.99"Hg - Average pressure in February:
29.98"Hg - Average pressure in March:
30.03"Hg - Average pressure in April:
29.96"Hg - Average pressure in May:
29.98"Hg - Average pressure in June:
29.91"Hg
- Average pressure in July:
29.93"Hg - Average pressure in August:
29.96"Hg - Average pressure in September:
30.05"Hg - Average pressure in October:
30"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 (29.91"Hg).
Average wind speed
Chatham, NH
- Average wind speed in January:
6.8mph - Average wind speed in February:
6.6mph - Average wind speed in March:
5.8mph - Average wind speed in April:
5.8mph - Average wind speed in May:
5.3mph - Average wind speed in June:
4.8mph
- Average wind speed in July:
4.5mph - Average wind speed in August:
4.2mph - Average wind speed in September:
4.4mph - Average wind speed in October:
5.8mph - Average wind speed in November:
6mph - Average wind speed in December:
6.2mph
The windiest month (with the highest average wind speed) is January (6.8mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).
Average humidity
Chatham, NH
The month with the highest relative humidity is February (87%).
The months with the lowest relative humidity are May and November (77%).
Average rainfall
Chatham, NH
- Average rainfall in January:
1.22" - Average rainfall in February:
1.26" - Average rainfall in March:
1.18" - Average rainfall in April:
2.17" - Average rainfall in May:
1.61" - Average rainfall in June:
1.97"
- Average rainfall in July:
1.5" - Average rainfall in August:
1.46" - Average rainfall in September:
0.94" - Average rainfall in October:
2.17" - Average rainfall in November:
1.54" - Average rainfall in December:
1.57"
The wettest months (with the highest rainfall) are April and October (2.17").
The driest month (with the least rainfall) is September (0.94").
Average rainfall days
Chatham, NH
- Average rainfall days in January:
11.9 days - Average rainfall days in February:
9.8 days - Average rainfall days in March:
13 days - Average rainfall days in April:
15.3 days - Average rainfall days in May:
15.7 days - Average rainfall days in June:
14.8 days
- Average rainfall days in July:
15.4 days - Average rainfall days in August:
14.1 days - Average rainfall days in September:
10.3 days - Average rainfall days in October:
13.5 days - Average rainfall days in November:
11.5 days - Average rainfall days in December:
12.7 days
The month with the highest number of rainy days is May (15.7 days).
The month with the least rainy days is February (9.8 days).
Average snowfall
Chatham, NH
- Average snowfall in January:
5.28" - Average snowfall in February:
6.73" - Average snowfall in March:
3.39" - Average snowfall in April:
3.43" - Average snowfall in May:
0.24" - Average snowfall in June:
0"
The month with the highest snowfall is February (6.73").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Chatham, NH
- Average snowfall days in January:
14.5 days - Average snowfall days in February:
14.5 days - Average snowfall days in March:
12.5 days - Average snowfall days in April:
5 days - Average snowfall days in May:
0.4 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:
5.5 days - Average snowfall days in December:
11.6 days
The months with the highest number of snowfall days are January and February (14.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Chatham, NH
- Average daylight in January:
9h and 18min - Average daylight in February:
10h and 30min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 30min - Average daylight in May:
14h and 48min - Average daylight in June:
15h and 30min
- Average daylight in July:
15h and 6min - Average daylight in August:
14h and 0min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 36min - Average daylight in December:
8h and 54min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in January:
4h and 48min - Average sunshine in February:
4h and 18min - Average sunshine in March:
5h and 30min - Average sunshine in April:
7h and 30min - Average sunshine in May:
8h and 12min - Average sunshine in June:
8h and 48min
- Average sunshine in July:
9h and 54min - Average sunshine in August:
10h and 6min - Average sunshine in September:
8h and 36min - Average sunshine in October:
5h and 54min - Average sunshine in November:
5h and 24min - Average sunshine in December:
4h and 42min
The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 18min).
Average sunshine days
Chatham, NH
- Average sunshine days in January:
12.4 days - Average sunshine days in February:
10.7 days - Average sunshine days in March:
11 days - Average sunshine days in April:
10.1 days - Average sunshine days in May:
11.8 days - Average sunshine days in June:
12.5 days
- Average sunshine days in July:
12 days - Average sunshine days in August:
13.7 days - Average sunshine days in September:
16.5 days - Average sunshine days in October:
14 days - Average sunshine days in November:
15.2 days - Average sunshine days in December:
12.7 days
The month with the most sunshine days is September (16.5 days).
The month with the least sunshine days is April (10.1 days).
Average UV index
Chatham, NH
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover
Chatham, NH
The month with the most cloud cover is February (Cloud cover 53).
The months with the least cloud cover are August and September (Cloud cover 37).
Average visibility
Chatham, NH
The months with the highest visibility are April, May, June, July, August, October, November and December (5mi).
The months with the lowest visibility are January, February, March and September (4mi).
