Aurora climate — normals and trends
Aurora (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 9.9 °C and it receives 421 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 (23.4 °C on average) and the coldest is January (-2.5 °C). Rainfall peaks in May.
Aurora averages 142 frost days, 55 hot days (≥ 30 °C) and 77 rainy days per year.
Aurora has warmed by +2.4 °C between 1940 and 2025, or +0.28 °C per decade. This trend is statistically significant.
The number of frost days there went from about 156 to 128 per year over the period.
The hottest day of the period reached 39.2 °C (on 11 July 1954) and the coldest -40.0 °C (on 12 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
AuroraColorado
- coords
- 39.73°, -104.83°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.9°C
Average daily high
17.4°C
Average daily low
3.4°C
Annual rainfall
421mm
Sunshine / day
10.6h
Mean relative humidity
51%
Average peak wind
17.5km/h
Seasonal range
25.9°C
Frost days (< 0 °C)
142 d/yr
Hot days (≥ 30 °C)
55 d/yr
Rainy days (≥ 1 mm)
77 d/yr
Annual snowfall
95.2 cm
Average feels-like high
14.5 °C
Average feels-like low
-0.1 °C
Average peak gust
32.6 km/h
Tropical nights (≥ 20 °C)
2 d/yr
Solar radiation
18.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.4 °C
since 1940
+0.3 °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
39.2 °C
11 July 1954
Coldest day
-40.0 °C
12 January 1963
Wettest day
68 mm
13 August 1975
Windiest day
53.3 km/h
23 March 1957
Strongest gust
97.9 km/h
6 June 2020
Hottest feels-like
38.5 °C
31 July 1966
Coldest feels-like
-45.4 °C
12 January 1963
Snowiest day
42.0 cm
3 April 1986
Sunniest day
14.1 h
24 June 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 | 2.1 °C | -2.8 °C | 19 mm | +3 mm |
| Feb | 7.5 °C | +0.5 °C | 15 mm | -1 mm |
| Mar | 16.0 °C | +5.0 °C | 33 mm | -5 mm |
| Apr | 17.9 °C | +2.0 °C | 20 mm | -37 mm |
| May | 21.9 °C | +0.9 °C | 66 mm | -7 mm |
| Jun | 28.9 °C | +1.4 °C | 66 mm | +20 mm |
| Jul | 32.9 °C | +1.9 °C | 40 mm | -2 mm |
| Aug | 31.1 °C | +1.3 °C | 43 mm | +6 mm |
| Sep | 26.5 °C | +1.0 °C | 42 mm | +12 mm |
| Oct | 20.5 °C | +1.9 °C | 18 mm | -12 mm |
| Nov | 15.8 °C | +5.1 °C | 7 mm | -15 mm |
| Dec | 13.8 °C | +7.6 °C | 9 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 Aurora?
Aurora has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 9.9 °C and it receives 421 mm of precipitation per year.
What is the hottest day ever recorded in Aurora?
The hottest day measured in Aurora between 1940 and 2025 was 11 July 1954, reaching 39.2 °C.
What is the coldest day in Aurora?
The coldest day measured in Aurora between 1940 and 2025 was 12 January 1963, at -40.0 °C.
Does it snow in Aurora?
Yes. Aurora gets on average 95.2 cm of snow per year and has around 142 frost days.
Has the climate of Aurora warmed?
Yes: Aurora warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Aurora?
The wettest day measured in Aurora between 1940 and 2025 was 13 August 1975, with 68 mm of rain in 24 hours.
What was the windiest day in Aurora?
The windiest day measured in Aurora between 1940 and 2025 was 23 March 1957, with winds reaching 53.3 km/h.
What is the warmest month in Aurora?
The warmest month in Aurora is July (23.4 °C on average); the coldest is January (-2.5 °C).
How much does it rain in Aurora?
Aurora receives on average 421 mm of precipitation per year, spread over about 77 rainy days.
Is it sunny in Aurora?
Aurora gets on average 10.6 hours of sunshine per day, roughly 3,869 hours per year over 1940-2025.
What is the biggest single-day snowfall in Aurora?
The heaviest 24-hour snowfall measured in Aurora between 1940 and 2025 was 3 April 1986, with 42.0 cm.
Are there tropical nights in Aurora?
Yes: Aurora has on average 2 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Aurora?
In Aurora, between 1940 and 2025, the highest apparent temperature reached 38.5 °C on 31 July 1966, and the lowest was -45.4 °C on 12 January 1963.
Compare Aurora with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Aurora