Guelph climate — normals and trends
Guelph (Canada) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 7.3 °C and it receives 895 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 (20.3 °C on average) and the coldest is January (-6.5 °C). Rainfall peaks in June.
Guelph averages 145 frost days, 8 hot days (≥ 30 °C) and 129 rainy days per year.
Guelph 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 155 to 135 per year over the period.
The hottest day of the period reached 36.1 °C (on 8 July 1988) and the coldest -33.6 °C (on 12 January 1982).
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
GuelphOntario
- coords
- 43.55°, -80.26°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
7.3°C
Average daily high
11.9°C
Average daily low
2.6°C
Annual rainfall
895mm
Sunshine / day
8.6h
Mean relative humidity
73%
Average peak wind
18.8km/h
Seasonal range
26.8°C
Frost days (< 0 °C)
145 d/yr
Hot days (≥ 30 °C)
8 d/yr
Rainy days (≥ 1 mm)
129 d/yr
Annual snowfall
114.0 cm
Average feels-like high
9.4 °C
Average feels-like low
-0.8 °C
Average peak gust
40.6 km/h
Tropical nights (≥ 20 °C)
6 d/yr
Solar radiation
14.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.6 °C
since 1940
+0.2 °C per decade · r² = 0.29 · 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
36.1 °C
8 July 1988
Coldest day
-33.6 °C
12 January 1982
Wettest day
87 mm
15 October 1954
Windiest day
52.4 km/h
6 April 1979
Strongest gust
111.2 km/h
6 April 1985
Hottest feels-like
39.7 °C
14 July 1995
Coldest feels-like
-38.7 °C
12 January 1982
Snowiest day
28.2 cm
25 February 1965
Sunniest day
15.0 h
14 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 | -3.9 °C | -1.3 °C | 35 mm | -26 mm |
| Feb | -2.8 °C | -1.3 °C | 73 mm | +18 mm |
| Mar | 7.0 °C | +3.1 °C | 74 mm | +5 mm |
| Apr | 12.4 °C | +0.9 °C | 69 mm | -13 mm |
| May | 16.5 °C | -1.6 °C | 79 mm | -6 mm |
| Jun | 24.6 °C | +1.4 °C | 92 mm | +1 mm |
| Jul | 27.6 °C | +2.0 °C | 42 mm | -42 mm |
| Aug | 24.5 °C | 0.0 °C | 57 mm | -21 mm |
| Sep | 22.5 °C | +2.1 °C | 52 mm | -24 mm |
| Oct | 15.4 °C | +1.7 °C | 65 mm | -7 mm |
| Nov | 5.8 °C | -0.5 °C | 61 mm | -13 mm |
| Dec | -1.1 °C | -1.1 °C | 91 mm | +23 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 Guelph?
Guelph has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 7.3 °C and it receives 895 mm of precipitation per year.
What is the hottest day ever recorded in Guelph?
The hottest day measured in Guelph between 1940 and 2025 was 8 July 1988, reaching 36.1 °C.
What is the coldest day in Guelph?
The coldest day measured in Guelph between 1940 and 2025 was 12 January 1982, at -33.6 °C.
Does it snow in Guelph?
Yes. Guelph gets on average 114.0 cm of snow per year and has around 145 frost days.
Has the climate of Guelph warmed?
Yes: Guelph warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Guelph?
The wettest day measured in Guelph between 1940 and 2025 was 15 October 1954, with 87 mm of rain in 24 hours.
What was the windiest day in Guelph?
The windiest day measured in Guelph between 1940 and 2025 was 6 April 1979, with winds reaching 52.4 km/h.
What is the warmest month in Guelph?
The warmest month in Guelph is July (20.3 °C on average); the coldest is January (-6.5 °C).
How much does it rain in Guelph?
Guelph receives on average 895 mm of precipitation per year, spread over about 129 rainy days.
Is it sunny in Guelph?
Guelph 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 Guelph?
The heaviest 24-hour snowfall measured in Guelph between 1940 and 2025 was 25 February 1965, with 28.2 cm.
Are there tropical nights in Guelph?
Yes: Guelph has on average 6 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Guelph?
In Guelph, between 1940 and 2025, the highest apparent temperature reached 39.7 °C on 14 July 1995, and the lowest was -38.7 °C on 12 January 1982.
Compare Guelph with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Guelph