Troy climate — normals and trends
Troy (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 11.0 °C and it receives 1,000 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 (-2.4 °C). Rainfall peaks in May.
Troy averages 105 frost days, 26 hot days (≥ 30 °C) and 124 rainy days per year.
Troy 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 38.7 °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
TroyOhio
- coords
- 40.04°, -84.20°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
11.0°C
Average daily high
15.9°C
Average daily low
6.4°C
Annual rainfall
1,000mm
Sunshine / day
8.7h
Mean relative humidity
70%
Average peak wind
18.9km/h
Seasonal range
25.7°C
Frost days (< 0 °C)
105 d/yr
Hot days (≥ 30 °C)
26 d/yr
Rainy days (≥ 1 mm)
124 d/yr
Annual snowfall
56.2 cm
Average feels-like high
14.2 °C
Average feels-like low
3.7 °C
Average peak gust
38.0 km/h
Tropical nights (≥ 20 °C)
29 d/yr
Solar radiation
14.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.36 · 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
38.7 °C
25 June 1988
Coldest day
-30.5 °C
19 January 1994
Wettest day
99 mm
20 July 1988
Windiest day
57.4 km/h
26 January 1978
Strongest gust
108.4 km/h
3 March 1953
Hottest feels-like
43.3 °C
30 July 1999
Coldest feels-like
-37.5 °C
20 January 1985
Snowiest day
22.6 cm
2 November 1966
Sunniest day
14.8 h
21 June 1941
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 | -2.7 °C | 38 mm | -36 mm |
| Feb | 3.7 °C | +0.1 °C | 90 mm | +21 mm |
| Mar | 14.5 °C | +5.0 °C | 83 mm | -15 mm |
| Apr | 17.8 °C | +1.6 °C | 147 mm | +43 mm |
| May | 20.4 °C | -1.3 °C | 105 mm | +0 mm |
| Jun | 27.8 °C | +1.4 °C | 191 mm | +98 mm |
| Jul | 29.2 °C | +1.0 °C | 101 mm | +15 mm |
| Aug | 26.5 °C | -1.1 °C | 43 mm | -34 mm |
| Sep | 26.3 °C | +2.0 °C | 65 mm | -1 mm |
| Oct | 18.9 °C | +1.0 °C | 86 mm | +20 mm |
| Nov | 10.1 °C | -0.1 °C | 52 mm | -31 mm |
| Dec | 4.2 °C | +0.2 °C | 67 mm | -11 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 Troy?
Troy has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 11.0 °C and it receives 1,000 mm of precipitation per year.
What is the hottest day ever recorded in Troy?
The hottest day measured in Troy between 1940 and 2025 was 25 June 1988, reaching 38.7 °C.
What is the coldest day in Troy?
The coldest day measured in Troy between 1940 and 2025 was 19 January 1994, at -30.5 °C.
Does it snow in Troy?
Yes. Troy gets on average 56.2 cm of snow per year and has around 105 frost days.
Has the climate of Troy warmed?
Yes: Troy warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Troy?
The wettest day measured in Troy between 1940 and 2025 was 20 July 1988, with 99 mm of rain in 24 hours.
What was the windiest day in Troy?
The windiest day measured in Troy between 1940 and 2025 was 26 January 1978, with winds reaching 57.4 km/h.
What is the warmest month in Troy?
The warmest month in Troy is July (23.3 °C on average); the coldest is January (-2.4 °C).
How much does it rain in Troy?
Troy receives on average 1,000 mm of precipitation per year, spread over about 124 rainy days.
Is it sunny in Troy?
Troy 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 Troy?
The heaviest 24-hour snowfall measured in Troy between 1940 and 2025 was 2 November 1966, with 22.6 cm.
Are there tropical nights in Troy?
Yes: Troy has on average 29 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Troy?
In Troy, between 1940 and 2025, the highest apparent temperature reached 43.3 °C on 30 July 1999, and the lowest was -37.5 °C on 20 January 1985.
Compare Troy with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Troy