Saco climate — normals and trends
Saco (United States) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.7 °C and it receives 1,051 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 (21.3 °C on average) and the coldest is January (-4.3 °C). Rainfall peaks in November.
Saco averages 111 frost days, 8 hot days (≥ 30 °C) and 115 rainy days per year.
Saco has warmed by +1.6 °C between 1940 and 2025, or +0.19 °C per decade. This trend is statistically significant.
The number of frost days there went from about 119 to 103 per year over the period.
The hottest day of the period reached 37.5 °C (on 24 June 2025) and the coldest -27.3 °C (on 13 February 1967).
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
SacoMaine
- coords
- 43.50°, -70.44°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.7°C
Average daily high
12.7°C
Average daily low
4.8°C
Annual rainfall
1,051mm
Sunshine / day
8.8h
Mean relative humidity
73%
Average peak wind
18.6km/h
Seasonal range
25.6°C
Frost days (< 0 °C)
111 d/yr
Hot days (≥ 30 °C)
8 d/yr
Rainy days (≥ 1 mm)
115 d/yr
Annual snowfall
129.6 cm
Average feels-like high
10.8 °C
Average feels-like low
1.7 °C
Average peak gust
39.6 km/h
Tropical nights (≥ 20 °C)
11 d/yr
Solar radiation
14.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.6 °C
since 1940
+0.2 °C per decade · r² = 0.38 · 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
37.5 °C
24 June 2025
Coldest day
-27.3 °C
13 February 1967
Wettest day
124 mm
11 September 1954
Windiest day
64.2 km/h
31 August 1954
Strongest gust
135.0 km/h
31 August 1954
Hottest feels-like
44.1 °C
2 August 1975
Coldest feels-like
-33.2 °C
4 February 2023
Snowiest day
37.7 cm
18 February 1952
Sunniest day
14.9 h
16 June 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 | -0.4 °C | 0.0 °C | 41 mm | -46 mm |
| Feb | 0.0 °C | -0.7 °C | 85 mm | +3 mm |
| Mar | 7.0 °C | +2.2 °C | 102 mm | +4 mm |
| Apr | 12.7 °C | +1.6 °C | 124 mm | +31 mm |
| May | 16.3 °C | -0.7 °C | 154 mm | +72 mm |
| Jun | 23.4 °C | +1.1 °C | 38 mm | -43 mm |
| Jul | 26.8 °C | +1.3 °C | 70 mm | -7 mm |
| Aug | 25.1 °C | +0.3 °C | 24 mm | -52 mm |
| Sep | 22.3 °C | +1.6 °C | 53 mm | -26 mm |
| Oct | 16.4 °C | +1.5 °C | 91 mm | -2 mm |
| Nov | 8.2 °C | -0.5 °C | 61 mm | -42 mm |
| Dec | 1.0 °C | -1.6 °C | 91 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 Saco?
Saco has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.7 °C and it receives 1,051 mm of precipitation per year.
What is the hottest day ever recorded in Saco?
The hottest day measured in Saco between 1940 and 2025 was 24 June 2025, reaching 37.5 °C.
What is the coldest day in Saco?
The coldest day measured in Saco between 1940 and 2025 was 13 February 1967, at -27.3 °C.
Does it snow in Saco?
Yes. Saco gets on average 129.6 cm of snow per year and has around 111 frost days.
Has the climate of Saco warmed?
Yes: Saco warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Saco?
The wettest day measured in Saco between 1940 and 2025 was 11 September 1954, with 124 mm of rain in 24 hours.
What was the windiest day in Saco?
The windiest day measured in Saco between 1940 and 2025 was 31 August 1954, with winds reaching 64.2 km/h.
What is the warmest month in Saco?
The warmest month in Saco is July (21.3 °C on average); the coldest is January (-4.3 °C).
How much does it rain in Saco?
Saco receives on average 1,051 mm of precipitation per year, spread over about 115 rainy days.
Is it sunny in Saco?
Saco gets on average 8.8 hours of sunshine per day, roughly 3,212 hours per year over 1940-2025.
What is the biggest single-day snowfall in Saco?
The heaviest 24-hour snowfall measured in Saco between 1940 and 2025 was 18 February 1952, with 37.7 cm.
Are there tropical nights in Saco?
Yes: Saco has on average 11 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Saco?
In Saco, between 1940 and 2025, the highest apparent temperature reached 44.1 °C on 2 August 1975, and the lowest was -33.2 °C on 4 February 2023.
Compare Saco with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Saco