Irondequoit climate — normals and trends
Irondequoit (United States) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.9 °C and it receives 1,064 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 (21.5 °C on average) and the coldest is February (-3.4 °C). Rainfall peaks in November.
Irondequoit averages 105 frost days, 3 hot days (≥ 30 °C) and 156 rainy days per year.
Irondequoit has warmed by +1.5 °C between 1940 and 2025, or +0.18 °C per decade. This trend is statistically significant.
The number of frost days there went from about 118 to 92 per year over the period.
The hottest day of the period reached 33.3 °C (on 4 September 1953) and the coldest -25.3 °C (on 18 February 1979).
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
IrondequoitNew York
- coords
- 43.21°, -77.58°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.9°C
Average daily high
12.1°C
Average daily low
5.8°C
Annual rainfall
1,064mm
Sunshine / day
8.5h
Mean relative humidity
73%
Average peak wind
23.1km/h
Seasonal range
24.9°C
Frost days (< 0 °C)
105 d/yr
Hot days (≥ 30 °C)
3 d/yr
Rainy days (≥ 1 mm)
156 d/yr
Annual snowfall
137.4 cm
Average feels-like high
9.7 °C
Average feels-like low
2.2 °C
Average peak gust
41.0 km/h
Tropical nights (≥ 20 °C)
21 d/yr
Solar radiation
13.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.5 °C
since 1940
+0.2 °C per decade · r² = 0.26 · 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
33.3 °C
4 September 1953
Coldest day
-25.3 °C
18 February 1979
Wettest day
77 mm
31 August 2005
Windiest day
65.7 km/h
13 November 2003
Strongest gust
112.0 km/h
6 April 1979
Hottest feels-like
38.2 °C
3 August 1988
Coldest feels-like
-31.2 °C
17 January 1982
Snowiest day
29.5 cm
4 March 1999
Sunniest day
14.8 h
4 July 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 | -0.9 °C | -0.7 °C | 97 mm | +12 mm |
| Feb | 0.1 °C | +0.2 °C | 94 mm | +23 mm |
| Mar | 8.0 °C | +4.3 °C | 53 mm | -32 mm |
| Apr | 10.5 °C | +1.0 °C | 97 mm | +1 mm |
| May | 13.9 °C | -1.2 °C | 156 mm | +69 mm |
| Jun | 21.2 °C | +0.3 °C | 64 mm | -19 mm |
| Jul | 26.3 °C | +1.5 °C | 45 mm | -37 mm |
| Aug | 24.6 °C | -0.1 °C | 80 mm | -3 mm |
| Sep | 22.1 °C | +0.9 °C | 32 mm | -57 mm |
| Oct | 15.7 °C | +0.7 °C | 128 mm | +27 mm |
| Nov | 7.7 °C | -0.7 °C | 114 mm | +11 mm |
| Dec | 2.1 °C | -0.5 °C | 108 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 Irondequoit?
Irondequoit has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.9 °C and it receives 1,064 mm of precipitation per year.
What is the hottest day ever recorded in Irondequoit?
The hottest day measured in Irondequoit between 1940 and 2025 was 4 September 1953, reaching 33.3 °C.
What is the coldest day in Irondequoit?
The coldest day measured in Irondequoit between 1940 and 2025 was 18 February 1979, at -25.3 °C.
Does it snow in Irondequoit?
Yes. Irondequoit gets on average 137.4 cm of snow per year and has around 105 frost days.
Has the climate of Irondequoit warmed?
Yes: Irondequoit warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Irondequoit?
The wettest day measured in Irondequoit between 1940 and 2025 was 31 August 2005, with 77 mm of rain in 24 hours.
What was the windiest day in Irondequoit?
The windiest day measured in Irondequoit between 1940 and 2025 was 13 November 2003, with winds reaching 65.7 km/h.
What is the warmest month in Irondequoit?
The warmest month in Irondequoit is July (21.5 °C on average); the coldest is February (-3.4 °C).
How much does it rain in Irondequoit?
Irondequoit receives on average 1,064 mm of precipitation per year, spread over about 156 rainy days.
Is it sunny in Irondequoit?
Irondequoit 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 Irondequoit?
The heaviest 24-hour snowfall measured in Irondequoit between 1940 and 2025 was 4 March 1999, with 29.5 cm.
Are there tropical nights in Irondequoit?
Yes: Irondequoit has on average 21 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Irondequoit?
In Irondequoit, between 1940 and 2025, the highest apparent temperature reached 38.2 °C on 3 August 1988, and the lowest was -31.2 °C on 17 January 1982.
Compare Irondequoit with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Irondequoit