Palmer climate — normals and trends
Palmer (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 9.2 °C and it receives 1,074 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 (-3.9 °C). Rainfall peaks in December.
Palmer averages 114 frost days, 8 hot days (≥ 30 °C) and 120 rainy days per year.
Palmer 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 125 to 103 per year over the period.
The hottest day of the period reached 36.8 °C (on 1 July 2018) and the coldest -26.5 °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
PalmerMassachusetts
- coords
- 42.16°, -72.33°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.2°C
Average daily high
13.4°C
Average daily low
5.2°C
Annual rainfall
1,074mm
Sunshine / day
8.6h
Mean relative humidity
71%
Average peak wind
16.7km/h
Seasonal range
26.0°C
Frost days (< 0 °C)
114 d/yr
Hot days (≥ 30 °C)
8 d/yr
Rainy days (≥ 1 mm)
120 d/yr
Annual snowfall
114.8 cm
Average feels-like high
11.4 °C
Average feels-like low
2.4 °C
Average peak gust
39.0 km/h
Tropical nights (≥ 20 °C)
16 d/yr
Solar radiation
14.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °C
since 1940
+0.2 °C per decade · r² = 0.42 · 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
36.8 °C
1 July 2018
Coldest day
-26.5 °C
13 February 1967
Wettest day
224 mm
19 August 1955
Windiest day
49.1 km/h
25 November 1950
Strongest gust
138.2 km/h
25 November 1950
Hottest feels-like
41.4 °C
1 July 2018
Coldest feels-like
-31.8 °C
14 February 2016
Snowiest day
31.4 cm
12 December 1992
Sunniest day
14.7 h
17 June 2021
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 | -0.5 °C | -0.6 °C | 42 mm | -43 mm |
| Feb | 0.8 °C | -0.6 °C | 84 mm | +3 mm |
| Mar | 9.2 °C | +3.3 °C | 101 mm | +5 mm |
| Apr | 14.1 °C | +1.9 °C | 104 mm | +10 mm |
| May | 18.4 °C | +0.1 °C | 209 mm | +116 mm |
| Jun | 24.4 °C | +1.1 °C | 60 mm | -27 mm |
| Jul | 28.2 °C | +1.8 °C | 84 mm | -1 mm |
| Aug | 25.5 °C | +0.1 °C | 35 mm | -54 mm |
| Sep | 22.9 °C | +1.6 °C | 75 mm | -10 mm |
| Oct | 16.0 °C | +0.7 °C | 91 mm | +3 mm |
| Nov | 8.4 °C | -0.5 °C | 61 mm | -32 mm |
| Dec | 1.2 °C | -1.4 °C | 91 mm | -6 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 Palmer?
Palmer has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 9.2 °C and it receives 1,074 mm of precipitation per year.
What is the hottest day ever recorded in Palmer?
The hottest day measured in Palmer between 1940 and 2025 was 1 July 2018, reaching 36.8 °C.
What is the coldest day in Palmer?
The coldest day measured in Palmer between 1940 and 2025 was 13 February 1967, at -26.5 °C.
Does it snow in Palmer?
Yes. Palmer gets on average 114.8 cm of snow per year and has around 114 frost days.
Has the climate of Palmer warmed?
Yes: Palmer warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Palmer?
The wettest day measured in Palmer between 1940 and 2025 was 19 August 1955, with 224 mm of rain in 24 hours.
What was the windiest day in Palmer?
The windiest day measured in Palmer between 1940 and 2025 was 25 November 1950, with winds reaching 49.1 km/h.
What is the warmest month in Palmer?
The warmest month in Palmer is July (22.1 °C on average); the coldest is January (-3.9 °C).
How much does it rain in Palmer?
Palmer receives on average 1,074 mm of precipitation per year, spread over about 120 rainy days.
Is it sunny in Palmer?
Palmer 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 Palmer?
The heaviest 24-hour snowfall measured in Palmer between 1940 and 2025 was 12 December 1992, with 31.4 cm.
Are there tropical nights in Palmer?
Yes: Palmer has on average 16 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Palmer?
In Palmer, between 1940 and 2025, the highest apparent temperature reached 41.4 °C on 1 July 2018, and the lowest was -31.8 °C on 14 February 2016.
Compare Palmer with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Palmer