Napanee climate — normals and trends
Napanee (Canada) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 7.8 °C and it receives 948 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 (21.7 °C on average) and the coldest is January (-7.0 °C). Rainfall peaks in April.
Napanee averages 132 frost days, 10 hot days (≥ 30 °C) and 129 rainy days per year.
Napanee has warmed by +1.4 °C between 1940 and 2025, or +0.17 °C per decade. This trend is statistically significant.
The number of frost days there went from about 138 to 126 per year over the period.
The hottest day of the period reached 36.8 °C (on 26 August 1948) and the coldest -36.2 °C (on 4 January 1981).
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
NapaneeOntario
- coords
- 44.25°, -76.95°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
7.8°C
Average daily high
12.2°C
Average daily low
3.4°C
Annual rainfall
948mm
Sunshine / day
8.7h
Mean relative humidity
73%
Average peak wind
17.2km/h
Seasonal range
28.7°C
Frost days (< 0 °C)
132 d/yr
Hot days (≥ 30 °C)
10 d/yr
Rainy days (≥ 1 mm)
129 d/yr
Annual snowfall
118.6 cm
Average feels-like high
10.0 °C
Average feels-like low
0.3 °C
Average peak gust
38.7 km/h
Tropical nights (≥ 20 °C)
11 d/yr
Solar radiation
14.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.4 °C
since 1940
+0.2 °C per decade · r² = 0.25 · 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
26 August 1948
Coldest day
-36.2 °C
4 January 1981
Wettest day
96 mm
9 September 2004
Windiest day
45.1 km/h
14 January 1950
Strongest gust
111.6 km/h
4 April 2018
Hottest feels-like
40.7 °C
26 August 1948
Coldest feels-like
-41.8 °C
4 January 1981
Snowiest day
25.8 cm
25 December 1978
Sunniest day
15.0 h
23 June 2021
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 | -2.5 °C | +0.5 °C | 41 mm | -25 mm |
| Feb | -2.5 °C | -0.7 °C | 77 mm | +16 mm |
| Mar | 5.8 °C | +2.2 °C | 110 mm | +37 mm |
| Apr | 11.7 °C | +0.3 °C | 85 mm | -1 mm |
| May | 17.9 °C | -0.6 °C | 106 mm | +22 mm |
| Jun | 24.6 °C | +0.8 °C | 52 mm | -29 mm |
| Jul | 28.3 °C | +1.7 °C | 52 mm | -32 mm |
| Aug | 26.2 °C | +0.8 °C | 41 mm | -41 mm |
| Sep | 23.1 °C | +2.3 °C | 35 mm | -49 mm |
| Oct | 15.8 °C | +1.9 °C | 81 mm | -2 mm |
| Nov | 5.4 °C | -1.4 °C | 69 mm | -14 mm |
| Dec | -1.0 °C | -1.1 °C | 103 mm | +24 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 Napanee?
Napanee has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 7.8 °C and it receives 948 mm of precipitation per year.
What is the hottest day ever recorded in Napanee?
The hottest day measured in Napanee between 1940 and 2025 was 26 August 1948, reaching 36.8 °C.
What is the coldest day in Napanee?
The coldest day measured in Napanee between 1940 and 2025 was 4 January 1981, at -36.2 °C.
Does it snow in Napanee?
Yes. Napanee gets on average 118.6 cm of snow per year and has around 132 frost days.
Has the climate of Napanee warmed?
Yes: Napanee warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Napanee?
The wettest day measured in Napanee between 1940 and 2025 was 9 September 2004, with 96 mm of rain in 24 hours.
What was the windiest day in Napanee?
The windiest day measured in Napanee between 1940 and 2025 was 14 January 1950, with winds reaching 45.1 km/h.
What is the warmest month in Napanee?
The warmest month in Napanee is July (21.7 °C on average); the coldest is January (-7.0 °C).
How much does it rain in Napanee?
Napanee receives on average 948 mm of precipitation per year, spread over about 129 rainy days.
Is it sunny in Napanee?
Napanee 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 Napanee?
The heaviest 24-hour snowfall measured in Napanee between 1940 and 2025 was 25 December 1978, with 25.8 cm.
Are there tropical nights in Napanee?
Yes: Napanee has on average 11 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Napanee?
In Napanee, between 1940 and 2025, the highest apparent temperature reached 40.7 °C on 26 August 1948, and the lowest was -41.8 °C on 4 January 1981.
Compare Napanee with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Napanee