Hilliard climate — normals and trends
Hilliard (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 11.1 °C and it receives 1,020 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 (23.3 °C on average) and the coldest is January (-2.2 °C). Rainfall peaks in May.
Hilliard averages 105 frost days, 26 hot days (≥ 30 °C) and 127 rainy days per year.
Hilliard 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 116 to 94 per year over the period.
The hottest day of the period reached 39.1 °C (on 16 July 1988) and the coldest -30.6 °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
HilliardOhio
- coords
- 40.03°, -83.16°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
11.1°C
Average daily high
16.0°C
Average daily low
6.4°C
Annual rainfall
1,020mm
Sunshine / day
8.7h
Mean relative humidity
70%
Average peak wind
18.8km/h
Seasonal range
25.5°C
Frost days (< 0 °C)
105 d/yr
Hot days (≥ 30 °C)
26 d/yr
Rainy days (≥ 1 mm)
127 d/yr
Annual snowfall
55.5 cm
Average feels-like high
14.3 °C
Average feels-like low
3.7 °C
Average peak gust
37.8 km/h
Tropical nights (≥ 20 °C)
28 d/yr
Solar radiation
14.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.35 · 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
16 July 1988
Coldest day
-30.6 °C
19 January 1994
Wettest day
102 mm
14 September 1979
Windiest day
58.0 km/h
14 September 2008
Strongest gust
120.2 km/h
25 March 1947
Hottest feels-like
41.7 °C
22 July 2011
Coldest feels-like
-36.6 °C
19 January 1994
Snowiest day
26.7 cm
22 March 1968
Sunniest day
14.9 h
21 June 1954
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 | -1.0 °C | -2.8 °C | 37 mm | -39 mm |
| Feb | 4.0 °C | +0.2 °C | 106 mm | +34 mm |
| Mar | 14.5 °C | +4.9 °C | 94 mm | -6 mm |
| Apr | 17.8 °C | +1.5 °C | 151 mm | +47 mm |
| May | 20.2 °C | -1.6 °C | 153 mm | +46 mm |
| Jun | 27.7 °C | +1.3 °C | 152 mm | +56 mm |
| Jul | 29.1 °C | +0.9 °C | 108 mm | +16 mm |
| Aug | 26.6 °C | -1.0 °C | 29 mm | -49 mm |
| Sep | 26.7 °C | +2.4 °C | 46 mm | -22 mm |
| Oct | 18.9 °C | +1.0 °C | 103 mm | +37 mm |
| Nov | 10.1 °C | -0.3 °C | 52 mm | -30 mm |
| Dec | 4.1 °C | -0.1 °C | 75 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 Hilliard?
Hilliard has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 11.1 °C and it receives 1,020 mm of precipitation per year.
What is the hottest day ever recorded in Hilliard?
The hottest day measured in Hilliard between 1940 and 2025 was 16 July 1988, reaching 39.1 °C.
What is the coldest day in Hilliard?
The coldest day measured in Hilliard between 1940 and 2025 was 19 January 1994, at -30.6 °C.
Does it snow in Hilliard?
Yes. Hilliard gets on average 55.5 cm of snow per year and has around 105 frost days.
Has the climate of Hilliard warmed?
Yes: Hilliard warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Hilliard?
The wettest day measured in Hilliard between 1940 and 2025 was 14 September 1979, with 102 mm of rain in 24 hours.
What was the windiest day in Hilliard?
The windiest day measured in Hilliard between 1940 and 2025 was 14 September 2008, with winds reaching 58.0 km/h.
What is the warmest month in Hilliard?
The warmest month in Hilliard is July (23.3 °C on average); the coldest is January (-2.2 °C).
How much does it rain in Hilliard?
Hilliard receives on average 1,020 mm of precipitation per year, spread over about 127 rainy days.
Is it sunny in Hilliard?
Hilliard 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 Hilliard?
The heaviest 24-hour snowfall measured in Hilliard between 1940 and 2025 was 22 March 1968, with 26.7 cm.
Are there tropical nights in Hilliard?
Yes: Hilliard has on average 28 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Hilliard?
In Hilliard, between 1940 and 2025, the highest apparent temperature reached 41.7 °C on 22 July 2011, and the lowest was -36.6 °C on 19 January 1994.
Compare Hilliard with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Hilliard