Ithaca climate — normals and trends
Ithaca (United States) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.4 °C and it receives 1,090 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 (21.0 °C on average) and the coldest is January (-4.7 °C). Rainfall peaks in May.
Ithaca averages 127 frost days, 10 hot days (≥ 30 °C) and 153 rainy days per year.
Ithaca 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 139 to 115 per year over the period.
The hottest day of the period reached 36.8 °C (on 21 July 2011) and the coldest -28.1 °C (on 15 January 1957).
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
IthacaNew York
- coords
- 42.44°, -76.50°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.4°C
Average daily high
12.9°C
Average daily low
4.0°C
Annual rainfall
1,090mm
Sunshine / day
8.1h
Mean relative humidity
74%
Average peak wind
16.4km/h
Seasonal range
25.7°C
Frost days (< 0 °C)
127 d/yr
Hot days (≥ 30 °C)
10 d/yr
Rainy days (≥ 1 mm)
153 d/yr
Annual snowfall
144.4 cm
Average feels-like high
10.9 °C
Average feels-like low
1.1 °C
Average peak gust
40.0 km/h
Tropical nights (≥ 20 °C)
8 d/yr
Solar radiation
13.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.39 · 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
36.8 °C
21 July 2011
Coldest day
-28.1 °C
15 January 1957
Wettest day
98 mm
30 September 2010
Windiest day
49.1 km/h
25 November 1950
Strongest gust
138.6 km/h
15 October 1954
Hottest feels-like
40.1 °C
21 July 2011
Coldest feels-like
-32.9 °C
15 January 1957
Snowiest day
31.9 cm
13 March 1993
Sunniest day
14.7 h
28 June 2022
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 | -2.8 °C | -1.6 °C | 55 mm | -19 mm |
| Feb | -0.5 °C | -0.5 °C | 83 mm | +12 mm |
| Mar | 10.0 °C | +4.9 °C | 58 mm | -33 mm |
| Apr | 13.7 °C | +1.4 °C | 106 mm | +6 mm |
| May | 17.6 °C | -1.2 °C | 153 mm | +51 mm |
| Jun | 25.0 °C | +1.4 °C | 108 mm | +10 mm |
| Jul | 28.1 °C | +2.0 °C | 66 mm | -27 mm |
| Aug | 25.7 °C | +0.6 °C | 48 mm | -41 mm |
| Sep | 23.2 °C | +2.1 °C | 61 mm | -33 mm |
| Oct | 15.7 °C | +1.0 °C | 95 mm | +0 mm |
| Nov | 7.0 °C | -0.7 °C | 85 mm | -10 mm |
| Dec | 0.0 °C | -1.4 °C | 86 mm | -1 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 Ithaca?
Ithaca has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.4 °C and it receives 1,090 mm of precipitation per year.
What is the hottest day ever recorded in Ithaca?
The hottest day measured in Ithaca between 1940 and 2025 was 21 July 2011, reaching 36.8 °C.
What is the coldest day in Ithaca?
The coldest day measured in Ithaca between 1940 and 2025 was 15 January 1957, at -28.1 °C.
Does it snow in Ithaca?
Yes. Ithaca gets on average 144.4 cm of snow per year and has around 127 frost days.
Has the climate of Ithaca warmed?
Yes: Ithaca warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ithaca?
The wettest day measured in Ithaca between 1940 and 2025 was 30 September 2010, with 98 mm of rain in 24 hours.
What was the windiest day in Ithaca?
The windiest day measured in Ithaca between 1940 and 2025 was 25 November 1950, with winds reaching 49.1 km/h.
What is the warmest month in Ithaca?
The warmest month in Ithaca is July (21.0 °C on average); the coldest is January (-4.7 °C).
How much does it rain in Ithaca?
Ithaca receives on average 1,090 mm of precipitation per year, spread over about 153 rainy days.
Is it sunny in Ithaca?
Ithaca gets on average 8.1 hours of sunshine per day, roughly 2,957 hours per year over 1940-2025.
What is the biggest single-day snowfall in Ithaca?
The heaviest 24-hour snowfall measured in Ithaca between 1940 and 2025 was 13 March 1993, with 31.9 cm.
Are there tropical nights in Ithaca?
Yes: Ithaca has on average 8 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Ithaca?
In Ithaca, between 1940 and 2025, the highest apparent temperature reached 40.1 °C on 21 July 2011, and the lowest was -32.9 °C on 15 January 1957.
Compare Ithaca with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Ithaca