Defiance climate — normals and trends
Defiance (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 10.3 °C and it receives 941 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 (23.0 °C on average) and the coldest is January (-3.6 °C). Rainfall peaks in May.
Defiance averages 115 frost days, 26 hot days (≥ 30 °C) and 122 rainy days per year.
Defiance has warmed by +2.0 °C between 1940 and 2025, or +0.23 °C per decade. This trend is statistically significant.
The number of frost days there went from about 129 to 101 per year over the period.
The hottest day of the period reached 39.8 °C (on 25 June 1988) and the coldest -30.2 °C (on 21 January 1984).
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
DefianceOhio
- coords
- 41.28°, -84.36°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.3°C
Average daily high
15.2°C
Average daily low
5.5°C
Annual rainfall
941mm
Sunshine / day
8.7h
Mean relative humidity
70%
Average peak wind
20.5km/h
Seasonal range
26.6°C
Frost days (< 0 °C)
115 d/yr
Hot days (≥ 30 °C)
26 d/yr
Rainy days (≥ 1 mm)
122 d/yr
Annual snowfall
67.0 cm
Average feels-like high
13.0 °C
Average feels-like low
2.6 °C
Average peak gust
39.2 km/h
Tropical nights (≥ 20 °C)
24 d/yr
Solar radiation
14.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.39 · 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
39.8 °C
25 June 1988
Coldest day
-30.2 °C
21 January 1984
Wettest day
72 mm
27 June 2015
Windiest day
63.8 km/h
26 January 1978
Strongest gust
111.6 km/h
11 November 1940
Hottest feels-like
43.6 °C
14 July 1995
Coldest feels-like
-37.3 °C
20 January 1985
Snowiest day
23.7 cm
26 January 1978
Sunniest day
14.9 h
14 June 1946
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 | -1.1 °C | -1.3 °C | 41 mm | -25 mm |
| Feb | 2.0 °C | 0.0 °C | 51 mm | -10 mm |
| Mar | 13.5 °C | +5.3 °C | 79 mm | -6 mm |
| Apr | 16.8 °C | +1.5 °C | 111 mm | +12 mm |
| May | 19.8 °C | -1.5 °C | 133 mm | +32 mm |
| Jun | 27.6 °C | +1.3 °C | 120 mm | +25 mm |
| Jul | 29.3 °C | +1.2 °C | 134 mm | +53 mm |
| Aug | 26.6 °C | -0.7 °C | 37 mm | -39 mm |
| Sep | 26.6 °C | +2.6 °C | 19 mm | -45 mm |
| Oct | 20.0 °C | +2.6 °C | 65 mm | -1 mm |
| Nov | 9.6 °C | 0.0 °C | 53 mm | -24 mm |
| Dec | 2.7 °C | -0.1 °C | 63 mm | -9 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 Defiance?
Defiance has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.3 °C and it receives 941 mm of precipitation per year.
What is the hottest day ever recorded in Defiance?
The hottest day measured in Defiance between 1940 and 2025 was 25 June 1988, reaching 39.8 °C.
What is the coldest day in Defiance?
The coldest day measured in Defiance between 1940 and 2025 was 21 January 1984, at -30.2 °C.
Does it snow in Defiance?
Yes. Defiance gets on average 67.0 cm of snow per year and has around 115 frost days.
Has the climate of Defiance warmed?
Yes: Defiance warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Defiance?
The wettest day measured in Defiance between 1940 and 2025 was 27 June 2015, with 72 mm of rain in 24 hours.
What was the windiest day in Defiance?
The windiest day measured in Defiance between 1940 and 2025 was 26 January 1978, with winds reaching 63.8 km/h.
What is the warmest month in Defiance?
The warmest month in Defiance is July (23.0 °C on average); the coldest is January (-3.6 °C).
How much does it rain in Defiance?
Defiance receives on average 941 mm of precipitation per year, spread over about 122 rainy days.
Is it sunny in Defiance?
Defiance gets on average 8.7 hours of sunshine per day, roughly 3,175 hours per year over 1940-2025.
What is the biggest single-day snowfall in Defiance?
The heaviest 24-hour snowfall measured in Defiance between 1940 and 2025 was 26 January 1978, with 23.7 cm.
Are there tropical nights in Defiance?
Yes: Defiance has on average 24 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Defiance?
In Defiance, between 1940 and 2025, the highest apparent temperature reached 43.6 °C on 14 July 1995, and the lowest was -37.3 °C on 20 January 1985.
Compare Defiance with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Defiance