Gloucester climate — normals and trends
Gloucester (United States) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.2 °C and it receives 1,254 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 August (19.5 °C on average) and the coldest is January (-0.9 °C). Rainfall peaks in December.
Gloucester averages 72 frost days, 0 hot days (≥ 30 °C) and 121 rainy days per year.
Gloucester has warmed by +1.5 °C between 1940 and 2025, or +0.17 °C per decade. This trend is statistically significant.
The number of frost days there went from about 82 to 62 per year over the period.
The hottest day of the period reached 30.4 °C (on 22 July 2011) and the coldest -22.7 °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
GloucesterMassachusetts
- coords
- 42.61°, -70.66°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.2°C
Average daily high
11.3°C
Average daily low
7.4°C
Annual rainfall
1,254mm
Sunshine / day
8.8h
Mean relative humidity
77%
Average peak wind
29.5km/h
Seasonal range
20.4°C
Frost days (< 0 °C)
72 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
121 d/yr
Annual snowfall
91.4 cm
Average feels-like high
8.6 °C
Average feels-like low
3.1 °C
Average peak gust
41.5 km/h
Tropical nights (≥ 20 °C)
11 d/yr
Solar radiation
14.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.5 °C
since 1940
+0.2 °C per decade · r² = 0.33 · 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
30.4 °C
22 July 2011
Coldest day
-22.7 °C
4 February 2023
Wettest day
155 mm
19 August 1955
Windiest day
88.9 km/h
31 August 1954
Strongest gust
143.6 km/h
31 August 1954
Hottest feels-like
33.4 °C
21 June 2012
Coldest feels-like
-34.2 °C
4 February 2023
Snowiest day
36.5 cm
27 January 2015
Sunniest day
14.8 h
25 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 | 1.2 °C | -0.8 °C | 57 mm | -56 mm |
| Feb | 2.2 °C | 0.0 °C | 115 mm | +12 mm |
| Mar | 6.4 °C | +2.0 °C | 132 mm | +10 mm |
| Apr | 10.0 °C | +1.8 °C | 138 mm | +20 mm |
| May | 13.5 °C | +0.7 °C | 157 mm | +55 mm |
| Jun | 18.6 °C | +0.9 °C | 65 mm | -24 mm |
| Jul | 22.2 °C | +1.2 °C | 72 mm | +0 mm |
| Aug | 20.7 °C | -0.2 °C | 22 mm | -62 mm |
| Sep | 19.1 °C | +0.8 °C | 72 mm | -19 mm |
| Oct | 15.1 °C | +1.2 °C | 130 mm | +18 mm |
| Nov | 9.3 °C | -0.1 °C | 72 mm | -51 mm |
| Dec | 3.7 °C | -1.0 °C | 108 mm | -17 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 Gloucester?
Gloucester has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 9.2 °C and it receives 1,254 mm of precipitation per year.
What is the hottest day ever recorded in Gloucester?
The hottest day measured in Gloucester between 1940 and 2025 was 22 July 2011, reaching 30.4 °C.
What is the coldest day in Gloucester?
The coldest day measured in Gloucester between 1940 and 2025 was 4 February 2023, at -22.7 °C.
Does it snow in Gloucester?
Yes. Gloucester gets on average 91.4 cm of snow per year and has around 72 frost days.
Has the climate of Gloucester warmed?
Yes: Gloucester warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Gloucester?
The wettest day measured in Gloucester between 1940 and 2025 was 19 August 1955, with 155 mm of rain in 24 hours.
What was the windiest day in Gloucester?
The windiest day measured in Gloucester between 1940 and 2025 was 31 August 1954, with winds reaching 88.9 km/h.
What is the warmest month in Gloucester?
The warmest month in Gloucester is August (19.5 °C on average); the coldest is January (-0.9 °C).
How much does it rain in Gloucester?
Gloucester receives on average 1,254 mm of precipitation per year, spread over about 121 rainy days.
Is it sunny in Gloucester?
Gloucester gets on average 8.8 hours of sunshine per day, roughly 3,212 hours per year over 1940-2025.
What is the biggest single-day snowfall in Gloucester?
The heaviest 24-hour snowfall measured in Gloucester between 1940 and 2025 was 27 January 2015, with 36.5 cm.
Are there tropical nights in Gloucester?
Yes: Gloucester has on average 11 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Gloucester?
In Gloucester, between 1940 and 2025, the highest apparent temperature reached 33.4 °C on 21 June 2012, and the lowest was -34.2 °C on 4 February 2023.
Compare Gloucester with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Gloucester