Westbrook climate — normals and trends
Westbrook (United States) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 7.9 °C and it receives 1,237 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 (19.2 °C on average) and the coldest is January (-3.8 °C). Rainfall peaks in November.
Westbrook averages 101 frost days, 0 hot days (≥ 30 °C) and 122 rainy days per year.
Westbrook has warmed by +1.5 °C between 1940 and 2025, or +0.18 °C per decade. This trend is statistically significant.
The number of frost days there went from about 110 to 92 per year over the period.
The hottest day of the period reached 32.1 °C (on 2 August 1975) and the coldest -25.6 °C (on 4 February 2023).
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
WestbrookMaine
- coords
- 43.68°, -70.37°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
7.9°C
Average daily high
10.6°C
Average daily low
5.3°C
Annual rainfall
1,237mm
Sunshine / day
8.7h
Mean relative humidity
76%
Average peak wind
23.1km/h
Seasonal range
23.0°C
Frost days (< 0 °C)
101 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
122 d/yr
Annual snowfall
129.2 cm
Average feels-like high
8.1 °C
Average feels-like low
1.7 °C
Average peak gust
36.7 km/h
Tropical nights (≥ 20 °C)
4 d/yr
Solar radiation
14.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.5 °C
since 1940
+0.2 °C per decade · r² = 0.37 · 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
32.1 °C
2 August 1975
Coldest day
-25.6 °C
4 February 2023
Wettest day
142 mm
21 October 1996
Windiest day
73.6 km/h
31 August 1954
Strongest gust
123.5 km/h
18 December 2023
Hottest feels-like
38.0 °C
2 August 1975
Coldest feels-like
-35.5 °C
4 February 2023
Snowiest day
37.7 cm
18 February 1952
Sunniest day
14.9 h
23 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 | -0.7 °C | -0.2 °C | 43 mm | -58 mm |
| Feb | -0.1 °C | -0.4 °C | 88 mm | -4 mm |
| Mar | 5.3 °C | +1.8 °C | 138 mm | +23 mm |
| Apr | 9.6 °C | +1.4 °C | 161 mm | +48 mm |
| May | 13.1 °C | -0.1 °C | 169 mm | +65 mm |
| Jun | 19.4 °C | +1.3 °C | 54 mm | -41 mm |
| Jul | 22.6 °C | +1.1 °C | 43 mm | -38 mm |
| Aug | 22.0 °C | +0.7 °C | 16 mm | -68 mm |
| Sep | 19.6 °C | +1.6 °C | 68 mm | -26 mm |
| Oct | 14.6 °C | +1.5 °C | 98 mm | -17 mm |
| Nov | 7.5 °C | -0.3 °C | 73 mm | -55 mm |
| Dec | 1.1 °C | -1.3 °C | 109 mm | -10 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 Westbrook?
Westbrook has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 7.9 °C and it receives 1,237 mm of precipitation per year.
What is the hottest day ever recorded in Westbrook?
The hottest day measured in Westbrook between 1940 and 2025 was 2 August 1975, reaching 32.1 °C.
What is the coldest day in Westbrook?
The coldest day measured in Westbrook between 1940 and 2025 was 4 February 2023, at -25.6 °C.
Does it snow in Westbrook?
Yes. Westbrook gets on average 129.2 cm of snow per year and has around 101 frost days.
Has the climate of Westbrook warmed?
Yes: Westbrook warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Westbrook?
The wettest day measured in Westbrook between 1940 and 2025 was 21 October 1996, with 142 mm of rain in 24 hours.
What was the windiest day in Westbrook?
The windiest day measured in Westbrook between 1940 and 2025 was 31 August 1954, with winds reaching 73.6 km/h.
What is the warmest month in Westbrook?
The warmest month in Westbrook is July (19.2 °C on average); the coldest is January (-3.8 °C).
How much does it rain in Westbrook?
Westbrook receives on average 1,237 mm of precipitation per year, spread over about 122 rainy days.
Is it sunny in Westbrook?
Westbrook gets on average 8.7 hours of sunshine per day, roughly 3,175 hours per year over 1940-2025.
What is the biggest single-day snowfall in Westbrook?
The heaviest 24-hour snowfall measured in Westbrook between 1940 and 2025 was 18 February 1952, with 37.7 cm.
Are there tropical nights in Westbrook?
Yes: Westbrook has on average 4 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Westbrook?
In Westbrook, between 1940 and 2025, the highest apparent temperature reached 38.0 °C on 2 August 1975, and the lowest was -35.5 °C on 4 February 2023.
Compare Westbrook with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Westbrook