Rolla climate — normals and trends
Rolla (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 13.1 °C and it receives 999 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 (25.5 °C on average) and the coldest is January (-0.3 °C). Rainfall peaks in May.
Rolla averages 87 frost days, 59 hot days (≥ 30 °C) and 113 rainy days per year.
Rolla has warmed by +1.3 °C between 1940 and 2025, or +0.16 °C per decade. This trend is statistically significant.
The number of frost days there went from about 97 to 77 per year over the period.
The hottest day of the period reached 43.9 °C (on 14 July 1954) and the coldest -29.4 °C (on 23 December 1989).
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
RollaMissouri
- coords
- 37.95°, -91.77°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
13.1°C
Average daily high
18.6°C
Average daily low
8.3°C
Annual rainfall
999mm
Sunshine / day
9.1h
Mean relative humidity
69%
Average peak wind
15.9km/h
Seasonal range
25.8°C
Frost days (< 0 °C)
87 d/yr
Hot days (≥ 30 °C)
59 d/yr
Rainy days (≥ 1 mm)
113 d/yr
Annual snowfall
39.5 cm
Average feels-like high
17.6 °C
Average feels-like low
6.2 °C
Average peak gust
36.9 km/h
Tropical nights (≥ 20 °C)
53 d/yr
Solar radiation
15.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.3 °C
since 1940
+0.2 °C per decade · r² = 0.22 · 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
43.9 °C
14 July 1954
Coldest day
-29.4 °C
23 December 1989
Wettest day
100 mm
14 September 2008
Windiest day
41.6 km/h
16 April 1945
Strongest gust
102.2 km/h
15 March 1990
Hottest feels-like
45.5 °C
14 July 1954
Coldest feels-like
-34.8 °C
21 January 1984
Snowiest day
20.7 cm
31 January 1982
Sunniest day
14.1 h
26 June 2023
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 | 3.3 °C | -1.3 °C | 60 mm | +2 mm |
| Feb | 6.4 °C | -1.0 °C | 43 mm | -20 mm |
| Mar | 18.2 °C | +5.4 °C | 65 mm | -33 mm |
| Apr | 20.1 °C | +1.2 °C | 177 mm | +65 mm |
| May | 21.7 °C | -1.7 °C | 116 mm | -6 mm |
| Jun | 28.0 °C | -0.6 °C | 224 mm | +129 mm |
| Jul | 31.0 °C | -0.1 °C | 85 mm | +5 mm |
| Aug | 30.5 °C | +0.1 °C | 6 mm | -69 mm |
| Sep | 28.7 °C | +2.5 °C | 76 mm | +2 mm |
| Oct | 21.9 °C | +1.6 °C | 96 mm | +16 mm |
| Nov | 14.6 °C | +2.1 °C | 63 mm | -17 mm |
| Dec | 9.2 °C | +2.5 °C | 14 mm | -49 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 Rolla?
Rolla has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 13.1 °C and it receives 999 mm of precipitation per year.
What is the hottest day ever recorded in Rolla?
The hottest day measured in Rolla between 1940 and 2025 was 14 July 1954, reaching 43.9 °C.
What is the coldest day in Rolla?
The coldest day measured in Rolla between 1940 and 2025 was 23 December 1989, at -29.4 °C.
Does it snow in Rolla?
Yes. Rolla gets on average 39.5 cm of snow per year and has around 87 frost days.
Has the climate of Rolla warmed?
Yes: Rolla warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Rolla?
The wettest day measured in Rolla between 1940 and 2025 was 14 September 2008, with 100 mm of rain in 24 hours.
What was the windiest day in Rolla?
The windiest day measured in Rolla between 1940 and 2025 was 16 April 1945, with winds reaching 41.6 km/h.
What is the warmest month in Rolla?
The warmest month in Rolla is July (25.5 °C on average); the coldest is January (-0.3 °C).
How much does it rain in Rolla?
Rolla receives on average 999 mm of precipitation per year, spread over about 113 rainy days.
Is it sunny in Rolla?
Rolla gets on average 9.1 hours of sunshine per day, roughly 3,322 hours per year over 1940-2025.
What is the biggest single-day snowfall in Rolla?
The heaviest 24-hour snowfall measured in Rolla between 1940 and 2025 was 31 January 1982, with 20.7 cm.
Are there tropical nights in Rolla?
Yes: Rolla has on average 53 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Rolla?
In Rolla, between 1940 and 2025, the highest apparent temperature reached 45.5 °C on 14 July 1954, and the lowest was -34.8 °C on 21 January 1984.
Compare Rolla with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Rolla