Roswell climate — normals and trends
Roswell (United States) has a cold semi-arid climate (BSk) under the Köppen-Geiger classification. Its mean annual temperature is 16.2 °C and it receives 323 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 (27.2 °C on average) and the coldest is January (4.4 °C). Rainfall peaks in August.
Roswell averages 62 frost days, 112 hot days (≥ 30 °C) and 55 rainy days per year.
Roswell has warmed by +2.3 °C between 1940 and 2025, or +0.27 °C per decade. This trend is statistically significant.
The number of frost days there went from about 75 to 49 per year over the period.
The hottest day of the period reached 44.5 °C (on 27 June 1994) and the coldest -22.0 °C (on 13 January 1963).
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
RoswellNew Mexico
- coords
- 33.39°, -104.52°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.2°C
Average daily high
23.4°C
Average daily low
9.5°C
Annual rainfall
323mm
Sunshine / day
11.0h
Mean relative humidity
46%
Average peak wind
23.2km/h
Seasonal range
22.8°C
Frost days (< 0 °C)
62 d/yr
Hot days (≥ 30 °C)
112 d/yr
Rainy days (≥ 1 mm)
55 d/yr
Annual snowfall
18.8 cm
Average feels-like high
20.5 °C
Average feels-like low
6.6 °C
Average peak gust
38.8 km/h
Tropical nights (≥ 20 °C)
51 d/yr
Solar radiation
20.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.3 °C
since 1940
+0.3 °C per decade · r² = 0.45 · 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
44.5 °C
27 June 1994
Coldest day
-22.0 °C
13 January 1963
Wettest day
89 mm
26 September 1980
Windiest day
68.9 km/h
4 May 1950
Strongest gust
106.2 km/h
6 April 2001
Hottest feels-like
42.6 °C
24 June 1990
Coldest feels-like
-26.5 °C
13 January 1963
Snowiest day
16.6 cm
29 January 1999
Sunniest day
14.0 h
30 May 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 | 9.3 °C | -2.4 °C | 6 mm | -9 mm |
| Feb | 18.2 °C | +3.4 °C | 1 mm | -13 mm |
| Mar | 22.8 °C | +3.5 °C | 3 mm | -14 mm |
| Apr | 26.4 °C | +2.1 °C | 29 mm | +8 mm |
| May | 28.8 °C | -0.1 °C | 73 mm | +36 mm |
| Jun | 33.4 °C | -0.3 °C | 58 mm | +29 mm |
| Jul | 33.8 °C | 0.0 °C | 44 mm | +6 mm |
| Aug | 35.4 °C | +2.7 °C | 24 mm | -19 mm |
| Sep | 30.8 °C | +1.7 °C | 10 mm | -32 mm |
| Oct | 26.9 °C | +3.3 °C | 17 mm | -19 mm |
| Nov | 21.3 °C | +4.6 °C | 9 mm | -6 mm |
| Dec | 18.0 °C | +5.7 °C | 2 mm | -15 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 Roswell?
Roswell has a cold semi-arid climate (Köppen BSk). Over 1940-2025, the average annual temperature is 16.2 °C and it receives 323 mm of precipitation per year.
What is the hottest day ever recorded in Roswell?
The hottest day measured in Roswell between 1940 and 2025 was 27 June 1994, reaching 44.5 °C.
What is the coldest day in Roswell?
The coldest day measured in Roswell between 1940 and 2025 was 13 January 1963, at -22.0 °C.
Does it snow in Roswell?
Yes. Roswell gets on average 18.8 cm of snow per year and has around 62 frost days.
Has the climate of Roswell warmed?
Yes: Roswell warmed by +2.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Roswell?
The wettest day measured in Roswell between 1940 and 2025 was 26 September 1980, with 89 mm of rain in 24 hours.
What was the windiest day in Roswell?
The windiest day measured in Roswell between 1940 and 2025 was 4 May 1950, with winds reaching 68.9 km/h.
What is the warmest month in Roswell?
The warmest month in Roswell is July (27.2 °C on average); the coldest is January (4.4 °C).
How much does it rain in Roswell?
Roswell receives on average 323 mm of precipitation per year, spread over about 55 rainy days.
Is it sunny in Roswell?
Roswell gets on average 11.0 hours of sunshine per day, roughly 4,015 hours per year over 1940-2025.
What is the biggest single-day snowfall in Roswell?
The heaviest 24-hour snowfall measured in Roswell between 1940 and 2025 was 29 January 1999, with 16.6 cm.
Are there tropical nights in Roswell?
Yes: Roswell has on average 51 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Roswell?
In Roswell, between 1940 and 2025, the highest apparent temperature reached 42.6 °C on 24 June 1990, and the lowest was -26.5 °C on 13 January 1963.
Compare Roswell with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Roswell