Sioux Falls climate — normals and trends
Sioux Falls (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 7.9 °C and it receives 754 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 (23.1 °C on average) and the coldest is January (-9.0 °C). Rainfall peaks in June.
Sioux Falls averages 151 frost days, 30 hot days (≥ 30 °C) and 93 rainy days per year.
Sioux Falls 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 156 to 146 per year over the period.
The hottest day of the period reached 39.4 °C (on 24 July 1940) and the coldest -37.3 °C (on 6 January 1988).
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
Sioux FallsSouth Dakota
- coords
- 43.54°, -96.73°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
7.9°C
Average daily high
13.2°C
Average daily low
2.6°C
Annual rainfall
754mm
Sunshine / day
9.3h
Mean relative humidity
70%
Average peak wind
23.0km/h
Seasonal range
32.1°C
Frost days (< 0 °C)
151 d/yr
Hot days (≥ 30 °C)
30 d/yr
Rainy days (≥ 1 mm)
93 d/yr
Annual snowfall
78.3 cm
Average feels-like high
10.5 °C
Average feels-like low
-0.9 °C
Average peak gust
41.4 km/h
Tropical nights (≥ 20 °C)
17 d/yr
Solar radiation
15.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °C
since 1940
+0.2 °C per decade · r² = 0.25 · 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
39.4 °C
24 July 1940
Coldest day
-37.3 °C
6 January 1988
Wettest day
105 mm
17 June 2024
Windiest day
76.2 km/h
10 November 1998
Strongest gust
123.8 km/h
10 October 1949
Hottest feels-like
45.2 °C
11 July 1954
Coldest feels-like
-42.4 °C
24 December 1983
Snowiest day
34.4 cm
9 November 1977
Sunniest day
15.0 h
12 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 | -1.9 °C | +2.3 °C | 3 mm | -17 mm |
| Feb | -2.7 °C | -1.2 °C | 7 mm | -17 mm |
| Mar | 12.1 °C | +6.9 °C | 79 mm | +29 mm |
| Apr | 15.5 °C | +1.6 °C | 55 mm | -28 mm |
| May | 21.9 °C | +1.4 °C | 59 mm | -48 mm |
| Jun | 27.4 °C | +1.5 °C | 160 mm | +40 mm |
| Jul | 28.2 °C | -0.3 °C | 113 mm | +36 mm |
| Aug | 26.3 °C | -1.1 °C | 83 mm | +1 mm |
| Sep | 25.5 °C | +2.7 °C | 43 mm | -29 mm |
| Oct | 18.8 °C | +2.9 °C | 34 mm | -21 mm |
| Nov | 7.9 °C | +1.9 °C | 30 mm | -8 mm |
| Dec | 0.6 °C | +2.1 °C | 25 mm | -1 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 Sioux Falls?
Sioux Falls has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 7.9 °C and it receives 754 mm of precipitation per year.
What is the hottest day ever recorded in Sioux Falls?
The hottest day measured in Sioux Falls between 1940 and 2025 was 24 July 1940, reaching 39.4 °C.
What is the coldest day in Sioux Falls?
The coldest day measured in Sioux Falls between 1940 and 2025 was 6 January 1988, at -37.3 °C.
Does it snow in Sioux Falls?
Yes. Sioux Falls gets on average 78.3 cm of snow per year and has around 151 frost days.
Has the climate of Sioux Falls warmed?
Yes: Sioux Falls warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sioux Falls?
The wettest day measured in Sioux Falls between 1940 and 2025 was 17 June 2024, with 105 mm of rain in 24 hours.
What was the windiest day in Sioux Falls?
The windiest day measured in Sioux Falls between 1940 and 2025 was 10 November 1998, with winds reaching 76.2 km/h.
What is the warmest month in Sioux Falls?
The warmest month in Sioux Falls is July (23.1 °C on average); the coldest is January (-9.0 °C).
How much does it rain in Sioux Falls?
Sioux Falls receives on average 754 mm of precipitation per year, spread over about 93 rainy days.
Is it sunny in Sioux Falls?
Sioux Falls gets on average 9.3 hours of sunshine per day, roughly 3,395 hours per year over 1940-2025.
What is the biggest single-day snowfall in Sioux Falls?
The heaviest 24-hour snowfall measured in Sioux Falls between 1940 and 2025 was 9 November 1977, with 34.4 cm.
Are there tropical nights in Sioux Falls?
Yes: Sioux Falls has on average 17 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Sioux Falls?
In Sioux Falls, between 1940 and 2025, the highest apparent temperature reached 45.2 °C on 11 July 1954, and the lowest was -42.4 °C on 24 December 1983.
Compare Sioux Falls with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Sioux Falls