Sidney climate — normals and trends
Sidney (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 10.7 °C and it receives 1,011 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 (-2.9 °C). Rainfall peaks in May.
Sidney averages 108 frost days, 23 hot days (≥ 30 °C) and 127 rainy days per year.
Sidney has warmed by +1.9 °C between 1940 and 2025, or +0.22 °C per decade. This trend is statistically significant.
The number of frost days there went from about 120 to 96 per year over the period.
The hottest day of the period reached 39.1 °C (on 25 June 1988) and the coldest -30.5 °C (on 19 January 1994).
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
SidneyOhio
- coords
- 40.28°, -84.16°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.7°C
Average daily high
15.6°C
Average daily low
6.1°C
Annual rainfall
1,011mm
Sunshine / day
8.5h
Mean relative humidity
71%
Average peak wind
19.9km/h
Seasonal range
26.0°C
Frost days (< 0 °C)
108 d/yr
Hot days (≥ 30 °C)
23 d/yr
Rainy days (≥ 1 mm)
127 d/yr
Annual snowfall
61.8 cm
Average feels-like high
13.7 °C
Average feels-like low
3.2 °C
Average peak gust
38.9 km/h
Tropical nights (≥ 20 °C)
27 d/yr
Solar radiation
14.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °C
since 1940
+0.2 °C per decade · r² = 0.37 · 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
25 June 1988
Coldest day
-30.5 °C
19 January 1994
Wettest day
76 mm
21 January 1959
Windiest day
62.4 km/h
26 January 1978
Strongest gust
110.2 km/h
19 March 1948
Hottest feels-like
43.0 °C
30 July 1999
Coldest feels-like
-37.7 °C
20 January 1985
Snowiest day
22.3 cm
2 November 1966
Sunniest day
14.8 h
11 June 2025
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 | -1.4 °C | -2.5 °C | 40 mm | -34 mm |
| Feb | 3.1 °C | 0.0 °C | 83 mm | +15 mm |
| Mar | 14.2 °C | +5.1 °C | 78 mm | -17 mm |
| Apr | 17.6 °C | +1.7 °C | 145 mm | +41 mm |
| May | 20.2 °C | -1.3 °C | 134 mm | +28 mm |
| Jun | 27.5 °C | +1.3 °C | 167 mm | +70 mm |
| Jul | 28.9 °C | +0.9 °C | 122 mm | +33 mm |
| Aug | 26.2 °C | -1.1 °C | 41 mm | -41 mm |
| Sep | 26.1 °C | +2.0 °C | 58 mm | -10 mm |
| Oct | 18.9 °C | +1.3 °C | 90 mm | +22 mm |
| Nov | 9.9 °C | -0.1 °C | 52 mm | -31 mm |
| Dec | 3.8 °C | +0.2 °C | 67 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 Sidney?
Sidney has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.7 °C and it receives 1,011 mm of precipitation per year.
What is the hottest day ever recorded in Sidney?
The hottest day measured in Sidney between 1940 and 2025 was 25 June 1988, reaching 39.1 °C.
What is the coldest day in Sidney?
The coldest day measured in Sidney between 1940 and 2025 was 19 January 1994, at -30.5 °C.
Does it snow in Sidney?
Yes. Sidney gets on average 61.8 cm of snow per year and has around 108 frost days.
Has the climate of Sidney warmed?
Yes: Sidney warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sidney?
The wettest day measured in Sidney between 1940 and 2025 was 21 January 1959, with 76 mm of rain in 24 hours.
What was the windiest day in Sidney?
The windiest day measured in Sidney between 1940 and 2025 was 26 January 1978, with winds reaching 62.4 km/h.
What is the warmest month in Sidney?
The warmest month in Sidney is July (23.1 °C on average); the coldest is January (-2.9 °C).
How much does it rain in Sidney?
Sidney receives on average 1,011 mm of precipitation per year, spread over about 127 rainy days.
Is it sunny in Sidney?
Sidney gets on average 8.5 hours of sunshine per day, roughly 3,103 hours per year over 1940-2025.
What is the biggest single-day snowfall in Sidney?
The heaviest 24-hour snowfall measured in Sidney between 1940 and 2025 was 2 November 1966, with 22.3 cm.
Are there tropical nights in Sidney?
Yes: Sidney has on average 27 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Sidney?
In Sidney, between 1940 and 2025, the highest apparent temperature reached 43.0 °C on 30 July 1999, and the lowest was -37.7 °C on 20 January 1985.
Compare Sidney with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Sidney