Brunswick climate — normals and trends
Brunswick (United States) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 7.8 °C and it receives 1,070 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 (20.6 °C on average) and the coldest is January (-5.8 °C). Rainfall peaks in November.
Brunswick averages 125 frost days, 5 hot days (≥ 30 °C) and 119 rainy days per year.
Brunswick 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 132 to 119 per year over the period.
The hottest day of the period reached 35.6 °C (on 2 August 1975) and the coldest -28.8 °C (on 13 February 1967).
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
BrunswickMaine
- coords
- 43.91°, -69.97°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
7.8°C
Average daily high
11.9°C
Average daily low
3.8°C
Annual rainfall
1,070mm
Sunshine / day
8.6h
Mean relative humidity
73%
Average peak wind
17.2km/h
Seasonal range
26.4°C
Frost days (< 0 °C)
125 d/yr
Hot days (≥ 30 °C)
5 d/yr
Rainy days (≥ 1 mm)
119 d/yr
Annual snowfall
140.0 cm
Average feels-like high
9.9 °C
Average feels-like low
0.7 °C
Average peak gust
39.0 km/h
Tropical nights (≥ 20 °C)
5 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 = 0.34 · 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
35.6 °C
2 August 1975
Coldest day
-28.8 °C
13 February 1967
Wettest day
116 mm
11 September 1954
Windiest day
57.1 km/h
31 August 1954
Strongest gust
132.8 km/h
18 December 2023
Hottest feels-like
41.1 °C
2 August 1975
Coldest feels-like
-35.1 °C
13 February 1967
Snowiest day
37.1 cm
18 February 1952
Sunniest day
15.0 h
15 June 1940
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 | -1.6 °C | 0.0 °C | 40 mm | -46 mm |
| Feb | -1.2 °C | -1.0 °C | 74 mm | -5 mm |
| Mar | 6.0 °C | +1.8 °C | 119 mm | +24 mm |
| Apr | 11.5 °C | +1.1 °C | 123 mm | +31 mm |
| May | 16.0 °C | -0.5 °C | 105 mm | +22 mm |
| Jun | 22.6 °C | +1.0 °C | 52 mm | -35 mm |
| Jul | 26.2 °C | +1.3 °C | 41 mm | -41 mm |
| Aug | 25.4 °C | +1.1 °C | 22 mm | -59 mm |
| Sep | 22.0 °C | +2.0 °C | 63 mm | -21 mm |
| Oct | 15.8 °C | +1.7 °C | 86 mm | -11 mm |
| Nov | 7.6 °C | -0.1 °C | 62 mm | -42 mm |
| Dec | 0.0 °C | -1.3 °C | 101 mm | +1 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 Brunswick?
Brunswick has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 7.8 °C and it receives 1,070 mm of precipitation per year.
What is the hottest day ever recorded in Brunswick?
The hottest day measured in Brunswick between 1940 and 2025 was 2 August 1975, reaching 35.6 °C.
What is the coldest day in Brunswick?
The coldest day measured in Brunswick between 1940 and 2025 was 13 February 1967, at -28.8 °C.
Does it snow in Brunswick?
Yes. Brunswick gets on average 140.0 cm of snow per year and has around 125 frost days.
Has the climate of Brunswick warmed?
Yes: Brunswick warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Brunswick?
The wettest day measured in Brunswick between 1940 and 2025 was 11 September 1954, with 116 mm of rain in 24 hours.
What was the windiest day in Brunswick?
The windiest day measured in Brunswick between 1940 and 2025 was 31 August 1954, with winds reaching 57.1 km/h.
What is the warmest month in Brunswick?
The warmest month in Brunswick is July (20.6 °C on average); the coldest is January (-5.8 °C).
How much does it rain in Brunswick?
Brunswick receives on average 1,070 mm of precipitation per year, spread over about 119 rainy days.
Is it sunny in Brunswick?
Brunswick 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 Brunswick?
The heaviest 24-hour snowfall measured in Brunswick between 1940 and 2025 was 18 February 1952, with 37.1 cm.
Are there tropical nights in Brunswick?
Yes: Brunswick has on average 5 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Brunswick?
In Brunswick, between 1940 and 2025, the highest apparent temperature reached 41.1 °C on 2 August 1975, and the lowest was -35.1 °C on 13 February 1967.
Compare Brunswick with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Brunswick