Climate and monthly weather forecastDerry, NH
Climate and monthly weather forecast
The climate of Derry
Derry, New Hampshire, resides in the geographic classification of Dfb, a zone determined by the Köppen climate classification. This zone signifies a humid continental climate with no dry season and warm summers. Weather conditions in Derry oscillate significantly across the year, providing a blend of temperatures and weather patterns dynamic and distinct.Analyzing the available data, Derry experiences temperature highs from 30.6°F (-0.8°C) in January to 81.7°F (27.6°C) in July. On the lower scale, temperatures range from 18°F (-7.8°C) in January to 61°F (16.1°C) in July, indicating a broad thermal range. Derry also encounters varied humidity levels, with the highest relative humidity of 81% in February and the lowest of 72% in April.
The town observes rainfall in a rather consistent manner throughout the year. The quantity of rainfall fluctuates from 0.75" (19mm) in January to 1.38" (35mm) in October. The number of rainfall days ranges from 4.1 days in January to a peak of 12.1 days in June. Interestingly, snowfall occurs from November to April, with the maximum snowfall of 2.99" (76mm) in December. Cloud coverage varies throughout the year, around 45% in January spiraling up to 51% in March.
Notably, the wind speed in Derry, on average, ranges from 8.3mph (13.4km/h) in January to a low of 5.1mph (8.2km/h) in August. Alongside, the highest UV index is observed between May and August, with a magnitude of 6.
The best time to visit Derry
Looking at the data, the most optimal time to visit Derry would be between May and September as these months offer warm temperatures, favourable for outdoor activities. Temperatures escalate to pleasant highs of 66.9°F (19.4°C) to 81.7°F (27.6°C) and lows between 47.1°F (8.4°C) to 61°F (16.1°C). Furthermore, daylight hours are longest between May and August, extending from 14.7 hours to 15.3 hours, offering plenty of daylight for sightseeing and explorations.The worst time to visit Derry
The period from November to March can be considered less traveler-friendly due to cold temperatures and snowfall. The temperatures during these months fluctuate between highs of 30.6°F (-0.8°C) to 41.2°F (5.1°C) and hit bitter lows from 18°F (-7.8°C) to 26.4°F (-3.1°C). Snowfall is at its pinnacle in December with 2.99" (76mm) of snow.Spring weather in Derry
Spring in Derry from March to May witnesses a rapid transition in temperatures from chilly winters towards warmer conditions. The high temperatures range from 41.2°F (5.1°C) in March to 66.9°F (19.4°C) in May and lows sit between 26.4°F (-3.1°C) to 47.1°F (8.4°C). Rainfall increases over the season, beginning at 1.18" (30mm) in March and escalating to 0.98" (25mm) in May.Summer weather in Derry
Summers from June to August in Derry are pleasant and warm. High temperatures range from 74.5°F (23.6°C) in June to 81.7°F (27.6°C) in July, while lows vary from 54.5°F (12.5°C) to 61°F (16.1°C). Even though rainfall is slightly high in June and July with 1.18" (30mm) and 1.3" (33mm) respectively, the extended daylight hours of a maximum of 15.3 hours in June provide plenty of time for outdoor activities.Autumn weather in Derry
Autumn, extending from September to November, witnesses a steady decline in temperatures. The highest temperature during this period drops from 72.1°F (22.3°C) in September to 46.6°F (8.1°C) in November and the lowest descends from 54°F (12.2°C) to 33.6°F (0.9°C). November sees a slight increase in rainfall with a peak of 1.3" (33mm).Winter weather in Derry
In winters from December to February, Derry becomes winter wonderland, with temperatures dropping low and snowfall marking its presence. Highs drop from 36.3°F (2.4°C) in December to 30.6°F (-0.8°C) in January with the lowest temperatures hovering between 25.3°F (-3.7°C) and 18°F (-7.8°C). Snowfall is a typical feature with 2.99" (76mm) in December, 2.4" (61mm) in January contributing to the snow-white charm Derry exudes in winters.Weather in January
January in Derry, New Hampshire typically welcomes the new year with cold temperatures and a significant chance of snowfall. On average, the temperatures range from 18°F (-7.8°C) to around 30.6°F (-0.8°C), with 2.4" (61mm) of snow accumulating over approximately seven days. Weather in January »Weather in February
As Derry transitions from January to February, the weather conditions observe a slight shift while maintaining a predominantly cold atmosphere. Although February is marginally warmer, it is noteworthy to mention that the snowfall stays at about 2.32" (59mm). Weather in February »Weather in March
March announces the arrival of early spring in Derry, with temperatures starting to rise, snowfall decreasing, and daylight hours moderately lengthening. However, one expected change in March is an increase in rainfall, about 1.18" (30mm) over approximately eight days, signifying a shift from snowfall to rainfall. Weather in March »Weather in April
April in Derry is known as a time of significant change, with temperatures increasing noticeably compared to the previous month, marking a transition from winter to spring. This month registers the lowest snowfall of the year, a negligible 0.91" (23mm), indicating the late arrival of spring. Weather in April »Weather in May
May defines the advent of consistently warmer days in Derry. The rainfall increases, helping the land further bloom into a lush landscape after the long winter. A considerable change occurs in the temperature pattern, aiding the flourishing of flora and fauna. Weather in May »Weather in June
June in Derry represents the onset of summer, with longest daylight hours and a substantial spike in temperatures. Moo, it receives one of the highest amounts of rainfall for the year, clocking in at 1.18" (30mm), highlighting the nature of mixed summer weather. Weather in June »Weather in July
July is the height of summer in Derry, signifying long sunny days accompanied by the season's maximum temperature and humidity. This month hits the peak mark with an average high temperature of 81.7°F (27.6°C), offering the quintessential summer climate. Weather in July »Weather in August
August in Derry sees a continuation of the summer season, with temperatures mildly cooler than July, indicating the impending arrival of fall. Circumstances remain favorable for outdoor activity, although afternoon thunderstorms can occasionally alter plans. Weather in August »Weather in September
September denotes the commencement of fall in Derry. Amidst decline in daylight hours, the temperature too observes a significant drop, marking a farewell to summer and welcoming the autumn. An enchanting transformation blankets the town as leaves change into hues of red, orange, and yellow, offering a captivating panorama. Weather in September »Weather in October
October continues the fall season in Derry, attracting leaf-peepers with its vibrant foliage and crisp autumn air. With temperatures dropping further and daylight decreasing, residents and visitors engage in seasonal activities, including pumpkin carving, apple cider processing, and haunted trail walks. Weather in October »Weather in November
A shift towards colder weather patterns sets in during November in Derry. The first snowfall occurs this month, with an average accumulation of 0.75" (19mm), marking the onset of the upcoming winter season. The splendid fall foliage begins to ebb as the leaves shed, preparing the trees for the frigid months ahead. Weather in November »Weather in December
December in Derry ushers in the winter plenitude, with below-freezing temperatures becoming a norm and snowfall increasing. December's most significant weather aspect is its snowfall, seeing about 2.99" (76mm), making recreational snow activities popular. Weather in December »Updated: Aug 30, 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 Derry, January registers the lowest temperatures, averaging 30.6°F (-0.8°C) at the peak and 18°F (-7.8°C) at the lowest.
The month with the least rainfall is January, when the rain falls for 4.1 days and typically collects 0.75" (19mm) of precipitation.
Throughout the year, there are 104.4 rainfall days, and 12.95" (329mm) of precipitation is accumulated.
January through May, October through December are months with snowfall.
In Derry, during the entire year, snow falls for 26.1 days and aggregates up to 11.54" (293mm) of snow.
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2.
February is the most humid month, with an average relative humidity of 81%.
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.
The least humid month is April, with an average relative humidity of 72%.
In Derry, 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.
The months with the highest UV index are June through August, with an average maximum UV index of 6.
Derry's warmest month, July, generally records average temperatures ranging from a high of 81.7°F (27.6°C) to a low of 61°F (16.1°C).
With an average of 10.4h of sunshine, August has the most sunshine of the year.
The month with the most rainfall is October, when the rain falls for 9.4 days and typically aggregates up to 1.38" (35mm) of precipitation.
December is the month with the most snowfall. Snow falls for 4 days and accumulates 2.99" (76mm) of snow.
The month with the shortest days is December, with an average of 9h and 6min of daylight.
Average temperature
Derry, NH
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (30.6°F).
The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is January (18°F).
Average pressure
Derry, NH
- 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:
29.96"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:
30.07"Hg - Average pressure in December:
30.03"Hg
The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Derry, NH
- Average wind speed in January:
8.3mph - Average wind speed in February:
8.1mph - Average wind speed in March:
7.9mph - Average wind speed in April:
7.6mph - Average wind speed in May:
6.3mph - Average wind speed in June:
5.7mph
- Average wind speed in July:
5.2mph - Average wind speed in August:
5.1mph - Average wind speed in September:
5.5mph - Average wind speed in October:
6.7mph - Average wind speed in November:
7.1mph - Average wind speed in December:
7.8mph
The windiest month (with the highest average wind speed) is January (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity
Derry, NH
The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is April (72%).
Average rainfall
Derry, NH
- Average rainfall in January:
0.75" - Average rainfall in February:
0.83" - Average rainfall in March:
1.18" - Average rainfall in April:
1.06" - Average rainfall in May:
0.98" - Average rainfall in June:
1.18"
The wettest month (with the highest rainfall) is October (1.38").
The driest month (with the least rainfall) is January (0.75").
Average rainfall days
Derry, NH
- Average rainfall days in January:
4.1 days - Average rainfall days in February:
4.5 days - Average rainfall days in March:
8.3 days - Average rainfall days in April:
9.8 days - Average rainfall days in May:
12 days - Average rainfall days in June:
12.1 days
- Average rainfall days in July:
11.9 days - Average rainfall days in August:
10.4 days - Average rainfall days in September:
8.4 days - Average rainfall days in October:
9.4 days - Average rainfall days in November:
7.2 days - Average rainfall days in December:
6.3 days
The month with the highest number of rainy days is June (12.1 days).
The month with the least rainy days is January (4.1 days).
Average snowfall
Derry, NH
- Average snowfall in January:
2.4" - Average snowfall in February:
2.32" - Average snowfall in March:
1.85" - Average snowfall in April:
0.91" - Average snowfall in May:
0.04" - Average snowfall in June:
0"
The month with the highest snowfall is December (2.99").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Derry, NH
- Average snowfall days in January:
7.1 days - Average snowfall days in February:
5.9 days - Average snowfall days in March:
5.7 days - Average snowfall days in April:
1.1 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:
0.5 days - Average snowfall days in November:
1.7 days - Average snowfall days in December:
4 days
The month with the highest number of snowfall days is January (7.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Derry, NH
- 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 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 48min - 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:
5h and 6min - Average sunshine in February:
4h and 36min - Average sunshine in March:
5h and 42min - Average sunshine in April:
8h and 6min - Average sunshine in May:
8h and 24min - Average sunshine in June:
9h and 0min
- Average sunshine in July:
10h and 6min - Average sunshine in August:
10h and 24min - Average sunshine in September:
8h and 24min - Average sunshine in October:
5h and 54min - Average sunshine in November:
5h and 30min - Average sunshine in December:
4h and 48min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days
Derry, NH
- Average sunshine days in January:
21.3 days - Average sunshine days in February:
18.9 days - Average sunshine days in March:
18.6 days - Average sunshine days in April:
18.3 days - Average sunshine days in May:
17.1 days - Average sunshine days in June:
16.7 days
- Average sunshine days in July:
17.1 days - Average sunshine days in August:
18 days - Average sunshine days in September:
20 days - Average sunshine days in October:
20 days - Average sunshine days in November:
21 days - Average sunshine days in December:
21.3 days
The months with the most sunshine days are January and December (21.3 days).
The month with the least sunshine days is June (16.7 days).
Average UV index
Derry, NH
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
Derry, NH
The month with the most cloud cover is March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility
Derry, NH
The months with the highest visibility are January, April, November and December (6mi).
The months with the lowest visibility are February, March, May, June, July, August, September and October (5mi).
