Waterville climate — normals and trends
Waterville (United States) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 7.1 °C and it receives 1,049 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 (20.6 °C on average) and the coldest is January (-7.2 °C). Rainfall peaks in November.
Waterville averages 136 frost days, 4 hot days (≥ 30 °C) and 120 rainy days per year.
Waterville 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 142 to 130 per year over the period.
The hottest day of the period reached 36.3 °C (on 2 August 1975) and the coldest -30.3 °C (on 2 February 1962).
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
WatervilleMaine
- coords
- 44.55°, -69.63°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
7.1°C
Average daily high
11.3°C
Average daily low
3.1°C
Annual rainfall
1,049mm
Sunshine / day
8.5h
Mean relative humidity
75%
Average peak wind
16.1km/h
Seasonal range
27.8°C
Frost days (< 0 °C)
136 d/yr
Hot days (≥ 30 °C)
4 d/yr
Rainy days (≥ 1 mm)
120 d/yr
Annual snowfall
153.2 cm
Average feels-like high
9.2 °C
Average feels-like low
0.1 °C
Average peak gust
36.3 km/h
Tropical nights (≥ 20 °C)
5 d/yr
Solar radiation
13.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.5 °C
since 1940
+0.2 °C per decade · r² = 0.35 · 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
36.3 °C
2 August 1975
Coldest day
-30.3 °C
2 February 1962
Wettest day
115 mm
11 September 1954
Windiest day
53.9 km/h
19 August 1991
Strongest gust
128.5 km/h
16 February 2016
Hottest feels-like
41.1 °C
2 August 1975
Coldest feels-like
-35.8 °C
2 February 1962
Snowiest day
37.0 cm
14 March 1984
Sunniest day
15.0 h
25 June 2025
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | -2.7 °C | +0.2 °C | 36 mm | -44 mm |
| Feb | -2.5 °C | -1.2 °C | 69 mm | -5 mm |
| Mar | 5.3 °C | +2.0 °C | 107 mm | +16 mm |
| Apr | 11.0 °C | +1.1 °C | 119 mm | +27 mm |
| May | 16.4 °C | -0.3 °C | 104 mm | +18 mm |
| Jun | 22.8 °C | +1.1 °C | 52 mm | -37 mm |
| Jul | 26.5 °C | +1.6 °C | 45 mm | -39 mm |
| Aug | 25.9 °C | +1.8 °C | 30 mm | -49 mm |
| Sep | 21.6 °C | +2.0 °C | 77 mm | -7 mm |
| Oct | 15.4 °C | +2.0 °C | 93 mm | -1 mm |
| Nov | 6.4 °C | -0.1 °C | 63 mm | -37 mm |
| Dec | -1.3 °C | -1.3 °C | 89 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 Waterville?
Waterville has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 7.1 °C and it receives 1,049 mm of precipitation per year.
What is the hottest day ever recorded in Waterville?
The hottest day measured in Waterville between 1940 and 2025 was 2 August 1975, reaching 36.3 °C.
What is the coldest day in Waterville?
The coldest day measured in Waterville between 1940 and 2025 was 2 February 1962, at -30.3 °C.
Does it snow in Waterville?
Yes. Waterville gets on average 153.2 cm of snow per year and has around 136 frost days.
Has the climate of Waterville warmed?
Yes: Waterville warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Waterville?
The wettest day measured in Waterville between 1940 and 2025 was 11 September 1954, with 115 mm of rain in 24 hours.
What was the windiest day in Waterville?
The windiest day measured in Waterville between 1940 and 2025 was 19 August 1991, with winds reaching 53.9 km/h.
What is the warmest month in Waterville?
The warmest month in Waterville is July (20.6 °C on average); the coldest is January (-7.2 °C).
How much does it rain in Waterville?
Waterville receives on average 1,049 mm of precipitation per year, spread over about 120 rainy days.
Is it sunny in Waterville?
Waterville 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 Waterville?
The heaviest 24-hour snowfall measured in Waterville between 1940 and 2025 was 14 March 1984, with 37.0 cm.
Are there tropical nights in Waterville?
Yes: Waterville has on average 5 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Waterville?
In Waterville, between 1940 and 2025, the highest apparent temperature reached 41.1 °C on 2 August 1975, and the lowest was -35.8 °C on 2 February 1962.
Compare Waterville with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Waterville