Ankeny climate — normals and trends
Ankeny (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 9.6 °C and it receives 930 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 (23.9 °C on average) and the coldest is January (-6.8 °C). Rainfall peaks in May.
Ankeny averages 128 frost days, 34 hot days (≥ 30 °C) and 105 rainy days per year.
Ankeny has warmed by +1.8 °C between 1940 and 2025, or +0.21 °C per decade. This trend is statistically significant.
The number of frost days there went from about 136 to 120 per year over the period.
The hottest day of the period reached 39.1 °C (on 15 August 1988) and the coldest -33.4 °C (on 3 February 1996).
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
AnkenyIowa
- coords
- 41.73°, -93.61°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.6°C
Average daily high
14.8°C
Average daily low
4.7°C
Annual rainfall
930mm
Sunshine / day
8.9h
Mean relative humidity
70%
Average peak wind
21.6km/h
Seasonal range
30.7°C
Frost days (< 0 °C)
128 d/yr
Hot days (≥ 30 °C)
34 d/yr
Rainy days (≥ 1 mm)
105 d/yr
Annual snowfall
66.1 cm
Average feels-like high
12.6 °C
Average feels-like low
1.6 °C
Average peak gust
39.7 km/h
Tropical nights (≥ 20 °C)
29 d/yr
Solar radiation
15.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.28 · 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
39.1 °C
15 August 1988
Coldest day
-33.4 °C
3 February 1996
Wettest day
100 mm
27 August 2009
Windiest day
69.7 km/h
4 January 1971
Strongest gust
114.5 km/h
5 May 1950
Hottest feels-like
46.2 °C
6 July 1948
Coldest feels-like
-40.2 °C
9 January 1982
Snowiest day
28.4 cm
9 April 1973
Sunniest day
14.8 h
27 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 | -0.4 °C | +1.9 °C | 10 mm | -22 mm |
| Feb | -0.5 °C | -0.9 °C | 12 mm | -23 mm |
| Mar | 14.3 °C | +6.8 °C | 99 mm | +26 mm |
| Apr | 16.7 °C | +1.1 °C | 90 mm | -14 mm |
| May | 22.6 °C | +0.9 °C | 90 mm | -39 mm |
| Jun | 28.8 °C | +1.9 °C | 138 mm | +16 mm |
| Jul | 29.1 °C | +0.2 °C | 246 mm | +150 mm |
| Aug | 27.1 °C | -0.8 °C | 49 mm | -47 mm |
| Sep | 26.6 °C | +2.7 °C | 47 mm | -41 mm |
| Oct | 20.2 °C | +2.7 °C | 79 mm | +12 mm |
| Nov | 10.0 °C | +1.6 °C | 46 mm | -6 mm |
| Dec | 1.5 °C | +0.7 °C | 28 mm | -10 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 Ankeny?
Ankeny has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 9.6 °C and it receives 930 mm of precipitation per year.
What is the hottest day ever recorded in Ankeny?
The hottest day measured in Ankeny between 1940 and 2025 was 15 August 1988, reaching 39.1 °C.
What is the coldest day in Ankeny?
The coldest day measured in Ankeny between 1940 and 2025 was 3 February 1996, at -33.4 °C.
Does it snow in Ankeny?
Yes. Ankeny gets on average 66.1 cm of snow per year and has around 128 frost days.
Has the climate of Ankeny warmed?
Yes: Ankeny warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ankeny?
The wettest day measured in Ankeny between 1940 and 2025 was 27 August 2009, with 100 mm of rain in 24 hours.
What was the windiest day in Ankeny?
The windiest day measured in Ankeny between 1940 and 2025 was 4 January 1971, with winds reaching 69.7 km/h.
What is the warmest month in Ankeny?
The warmest month in Ankeny is July (23.9 °C on average); the coldest is January (-6.8 °C).
How much does it rain in Ankeny?
Ankeny receives on average 930 mm of precipitation per year, spread over about 105 rainy days.
Is it sunny in Ankeny?
Ankeny gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.
What is the biggest single-day snowfall in Ankeny?
The heaviest 24-hour snowfall measured in Ankeny between 1940 and 2025 was 9 April 1973, with 28.4 cm.
Are there tropical nights in Ankeny?
Yes: Ankeny has on average 29 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Ankeny?
In Ankeny, between 1940 and 2025, the highest apparent temperature reached 46.2 °C on 6 July 1948, and the lowest was -40.2 °C on 9 January 1982.
Compare Ankeny with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Ankeny