Leominster climate — normals and trends
Leominster (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 9.1 °C and it receives 1,142 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 (22.1 °C on average) and the coldest is January (-4.0 °C). Rainfall peaks in March.
Leominster averages 121 frost days, 17 hot days (≥ 30 °C) and 125 rainy days per year.
Leominster has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.
The number of frost days there went from about 130 to 112 per year over the period.
The hottest day of the period reached 38.5 °C (on 22 July 2011) and the coldest -27.4 °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
LeominsterMassachusetts
- coords
- 42.53°, -71.76°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.1°C
Average daily high
13.9°C
Average daily low
4.6°C
Annual rainfall
1,142mm
Sunshine / day
8.6h
Mean relative humidity
69%
Average peak wind
17.1km/h
Seasonal range
26.1°C
Frost days (< 0 °C)
121 d/yr
Hot days (≥ 30 °C)
17 d/yr
Rainy days (≥ 1 mm)
125 d/yr
Annual snowfall
134.6 cm
Average feels-like high
11.7 °C
Average feels-like low
1.6 °C
Average peak gust
40.4 km/h
Tropical nights (≥ 20 °C)
14 d/yr
Solar radiation
14.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °C
since 1940
+0.2 °C per decade · r² = 0.43 · 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
38.5 °C
22 July 2011
Coldest day
-27.4 °C
13 February 1967
Wettest day
166 mm
19 August 1955
Windiest day
53.7 km/h
19 August 1991
Strongest gust
128.5 km/h
26 November 1950
Hottest feels-like
42.4 °C
2 August 1975
Coldest feels-like
-33.6 °C
20 December 1942
Snowiest day
38.7 cm
12 December 1992
Sunniest day
14.8 h
10 June 1941
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 | -0.3 °C | -0.4 °C | 49 mm | -40 mm |
| Feb | 0.8 °C | -0.7 °C | 91 mm | +6 mm |
| Mar | 9.8 °C | +3.6 °C | 92 mm | -10 mm |
| Apr | 14.8 °C | +1.8 °C | 103 mm | +5 mm |
| May | 18.9 °C | -0.3 °C | 230 mm | +133 mm |
| Jun | 25.1 °C | +0.9 °C | 68 mm | -29 mm |
| Jul | 29.2 °C | +2.0 °C | 89 mm | -7 mm |
| Aug | 26.5 °C | +0.5 °C | 38 mm | -60 mm |
| Sep | 23.3 °C | +1.5 °C | 76 mm | -13 mm |
| Oct | 16.3 °C | +0.7 °C | 105 mm | +15 mm |
| Nov | 8.5 °C | -0.5 °C | 69 mm | -29 mm |
| Dec | 1.0 °C | -1.6 °C | 86 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 Leominster?
Leominster has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 9.1 °C and it receives 1,142 mm of precipitation per year.
What is the hottest day ever recorded in Leominster?
The hottest day measured in Leominster between 1940 and 2025 was 22 July 2011, reaching 38.5 °C.
What is the coldest day in Leominster?
The coldest day measured in Leominster between 1940 and 2025 was 13 February 1967, at -27.4 °C.
Does it snow in Leominster?
Yes. Leominster gets on average 134.6 cm of snow per year and has around 121 frost days.
Has the climate of Leominster warmed?
Yes: Leominster warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Leominster?
The wettest day measured in Leominster between 1940 and 2025 was 19 August 1955, with 166 mm of rain in 24 hours.
What was the windiest day in Leominster?
The windiest day measured in Leominster between 1940 and 2025 was 19 August 1991, with winds reaching 53.7 km/h.
What is the warmest month in Leominster?
The warmest month in Leominster is July (22.1 °C on average); the coldest is January (-4.0 °C).
How much does it rain in Leominster?
Leominster receives on average 1,142 mm of precipitation per year, spread over about 125 rainy days.
Is it sunny in Leominster?
Leominster 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 Leominster?
The heaviest 24-hour snowfall measured in Leominster between 1940 and 2025 was 12 December 1992, with 38.7 cm.
Are there tropical nights in Leominster?
Yes: Leominster has on average 14 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Leominster?
In Leominster, between 1940 and 2025, the highest apparent temperature reached 42.4 °C on 2 August 1975, and the lowest was -33.6 °C on 20 December 1942.
Compare Leominster with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Leominster