Ancaster climate — normals and trends
Ancaster (Canada) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.2 °C and it receives 894 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 (21.4 °C on average) and the coldest is January (-5.4 °C). Rainfall peaks in June.
Ancaster averages 133 frost days, 11 hot days (≥ 30 °C) and 128 rainy days per year.
Ancaster 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 144 to 122 per year over the period.
The hottest day of the period reached 38.0 °C (on 7 July 1988) and the coldest -31.1 °C (on 16 February 2015).
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
AncasterOntario
- coords
- 43.22°, -79.99°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.2°C
Average daily high
12.8°C
Average daily low
3.6°C
Annual rainfall
894mm
Sunshine / day
8.6h
Mean relative humidity
72%
Average peak wind
18.3km/h
Seasonal range
26.8°C
Frost days (< 0 °C)
133 d/yr
Hot days (≥ 30 °C)
11 d/yr
Rainy days (≥ 1 mm)
128 d/yr
Annual snowfall
99.8 cm
Average feels-like high
10.5 °C
Average feels-like low
0.5 °C
Average peak gust
39.4 km/h
Tropical nights (≥ 20 °C)
11 d/yr
Solar radiation
14.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.6 °C
since 1940
+0.2 °C per decade · r² = 0.30 · 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
38.0 °C
7 July 1988
Coldest day
-31.1 °C
16 February 2015
Wettest day
89 mm
15 October 1954
Windiest day
50.0 km/h
15 March 1959
Strongest gust
112.7 km/h
6 April 1985
Hottest feels-like
41.3 °C
14 July 1995
Coldest feels-like
-36.1 °C
16 February 2015
Snowiest day
27.0 cm
7 February 1942
Sunniest day
15.0 h
20 June 1940
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 | -2.6 °C | -0.9 °C | 32 mm | -28 mm |
| Feb | -1.8 °C | -1.1 °C | 72 mm | +16 mm |
| Mar | 8.0 °C | +3.3 °C | 75 mm | +3 mm |
| Apr | 12.9 °C | +0.7 °C | 64 mm | -20 mm |
| May | 17.2 °C | -1.6 °C | 92 mm | +8 mm |
| Jun | 25.3 °C | +1.3 °C | 64 mm | -25 mm |
| Jul | 28.5 °C | +2.1 °C | 41 mm | -45 mm |
| Aug | 25.4 °C | +0.1 °C | 53 mm | -24 mm |
| Sep | 23.4 °C | +2.2 °C | 39 mm | -36 mm |
| Oct | 16.3 °C | +1.7 °C | 67 mm | -4 mm |
| Nov | 6.9 °C | -0.5 °C | 52 mm | -20 mm |
| Dec | 0.3 °C | -0.8 °C | 86 mm | +19 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 Ancaster?
Ancaster has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.2 °C and it receives 894 mm of precipitation per year.
What is the hottest day ever recorded in Ancaster?
The hottest day measured in Ancaster between 1940 and 2025 was 7 July 1988, reaching 38.0 °C.
What is the coldest day in Ancaster?
The coldest day measured in Ancaster between 1940 and 2025 was 16 February 2015, at -31.1 °C.
Does it snow in Ancaster?
Yes. Ancaster gets on average 99.8 cm of snow per year and has around 133 frost days.
Has the climate of Ancaster warmed?
Yes: Ancaster warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ancaster?
The wettest day measured in Ancaster between 1940 and 2025 was 15 October 1954, with 89 mm of rain in 24 hours.
What was the windiest day in Ancaster?
The windiest day measured in Ancaster between 1940 and 2025 was 15 March 1959, with winds reaching 50.0 km/h.
What is the warmest month in Ancaster?
The warmest month in Ancaster is July (21.4 °C on average); the coldest is January (-5.4 °C).
How much does it rain in Ancaster?
Ancaster receives on average 894 mm of precipitation per year, spread over about 128 rainy days.
Is it sunny in Ancaster?
Ancaster gets on average 8.6 hours of sunshine per day, roughly 3,139 hours per year over 1940-2025.
What is the biggest single-day snowfall in Ancaster?
The heaviest 24-hour snowfall measured in Ancaster between 1940 and 2025 was 7 February 1942, with 27.0 cm.
Are there tropical nights in Ancaster?
Yes: Ancaster has on average 11 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Ancaster?
In Ancaster, between 1940 and 2025, the highest apparent temperature reached 41.3 °C on 14 July 1995, and the lowest was -36.1 °C on 16 February 2015.
Compare Ancaster with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Ancaster