Derry climate — normals and trends
Derry (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 9.0 °C and it receives 1,057 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (22.3 °C on average) and the coldest is January (-4.6 °C). Rainfall peaks in November.
Derry averages 126 frost days, 23 hot days (≥ 30 °C) and 118 rainy days per year.
Derry has warmed by +1.8 °C between 1940 and 2025, or +0.21 °C per decade. This trend is statistically significant.
The number of frost days there went from about 135 to 117 per year over the period.
The hottest day of the period reached 39.7 °C (on 2 August 1975) and the coldest -28.6 °C (on 14 January 1957).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
DerryNew Hampshire
- coords
- 42.88°, -71.33°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.0°C
Average daily high
14.1°C
Average daily low
4.2°C
Annual rainfall
1,057mm
Sunshine / day
8.6h
Mean relative humidity
69%
Average peak wind
16.1km/h
Seasonal range
26.9°C
Frost days (< 0 °C)
126 d/yr
Hot days (≥ 30 °C)
23 d/yr
Rainy days (≥ 1 mm)
118 d/yr
Annual snowfall
129.0 cm
Average feels-like high
12.0 °C
Average feels-like low
1.3 °C
Average peak gust
38.4 km/h
Tropical nights (≥ 20 °C)
13 d/yr
Solar radiation
14.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.42 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
39.7 °C
2 August 1975
Coldest day
-28.6 °C
14 January 1957
Wettest day
105 mm
11 September 1954
Windiest day
53.8 km/h
19 August 1991
Strongest gust
128.2 km/h
26 November 1950
Hottest feels-like
43.6 °C
2 August 1975
Coldest feels-like
-34.4 °C
13 February 1967
Snowiest day
34.4 cm
19 February 1972
Sunniest day
14.8 h
12 June 2025
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 0.0 °C | +0.1 °C | 42 mm | -42 mm |
| Feb | 0.7 °C | -0.7 °C | 86 mm | +5 mm |
| Mar | 9.7 °C | +3.4 °C | 94 mm | -3 mm |
| Apr | 14.9 °C | +1.8 °C | 116 mm | +22 mm |
| May | 18.9 °C | -0.5 °C | 225 mm | +138 mm |
| Jun | 25.5 °C | +0.8 °C | 46 mm | -38 mm |
| Jul | 30.0 °C | +2.2 °C | 75 mm | -11 mm |
| Aug | 27.1 °C | +0.5 °C | 41 mm | -42 mm |
| Sep | 23.8 °C | +1.6 °C | 64 mm | -15 mm |
| Oct | 17.0 °C | +1.2 °C | 103 mm | +16 mm |
| Nov | 8.3 °C | -0.7 °C | 76 mm | -23 mm |
| Dec | 0.6 °C | -1.9 °C | 87 mm | -11 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Derry?
Derry has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 9.0 °C and it receives 1,057 mm of precipitation per year.
What is the hottest day ever recorded in Derry?
The hottest day measured in Derry between 1940 and 2025 was 2 August 1975, reaching 39.7 °C.
What is the coldest day in Derry?
The coldest day measured in Derry between 1940 and 2025 was 14 January 1957, at -28.6 °C.
Does it snow in Derry?
Yes. Derry gets on average 129.0 cm of snow per year and has around 126 frost days.
Has the climate of Derry warmed?
Yes: Derry warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Derry?
The wettest day measured in Derry between 1940 and 2025 was 11 September 1954, with 105 mm of rain in 24 hours.
What was the windiest day in Derry?
The windiest day measured in Derry between 1940 and 2025 was 19 August 1991, with winds reaching 53.8 km/h.
What is the warmest month in Derry?
The warmest month in Derry is July (22.3 °C on average); the coldest is January (-4.6 °C).
How much does it rain in Derry?
Derry receives on average 1,057 mm of precipitation per year, spread over about 118 rainy days.
Is it sunny in Derry?
Derry gets on average 8.6 hours of sunshine per day, roughly 3,139 hours per year over 1940-2025.
What is the biggest single-day snowfall in Derry?
The heaviest 24-hour snowfall measured in Derry between 1940 and 2025 was 19 February 1972, with 34.4 cm.
Are there tropical nights in Derry?
Yes: Derry has on average 13 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Derry?
In Derry, between 1940 and 2025, the highest apparent temperature reached 43.6 °C on 2 August 1975, and the lowest was -34.4 °C on 13 February 1967.
Compare Derry with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Derry