Guelph climate
Guelph (Ontario, Canada) has a warm-summer humid continental climate (Köppen Dfb). The average temperature over the year is 8 °C46 °F, and about 770 mm30 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Guelph climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | −327 | −1013 | −720 | 512.0 | 30 |
| Feb | −229 | −1112 | −620 | 481.9 | 28 |
| Mar | 438 | −621 | −130 | 522.1 | 28 |
| Apr | 1152 | −131 | 542 | 702.7 | 16 |
| May | 1966 | 643 | 1254 | 742.9 | 2 |
| Jun | 2476 | 1254 | 1865 | 732.9 | 0 |
| Jul | 2883 | 1660 | 2271 | 783.1 | 0 |
| Aug | 2781 | 1559 | 2170 | 632.5 | 0 |
| Sep | 2373 | 1152 | 1763 | 692.7 | 0 |
| Oct | 1458 | 440 | 949 | 742.9 | 4 |
| Nov | 744 | −129 | 337 | 632.5 | 18 |
| Dec | 032 | −620 | −326 | 552.2 | 29 |
| Year | 2883 | −1112 | 846 | 77030 | 154 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 90% | 77% | 1.5 | 9:17 |
| Feb | 89% | 75% | 2.3 | 10:26 |
| Mar | 83% | 68% | 3.5 | 11:48 |
| Apr | 78% | 65% | 4.6 | 13:22 |
| May | 75% | 63% | 5.5 | 14:41 |
| Jun | 71% | 56% | 6.2 | 15:24 |
| Jul | 66% | 51% | 6.1 | 15:07 |
| Aug | 67% | 50% | 5.3 | 13:58 |
| Sep | 71% | 51% | 4.2 | 12:26 |
| Oct | 79% | 67% | 2.5 | 10:55 |
| Nov | 84% | 72% | 1.6 | 9:36 |
| Dec | 89% | 82% | 1.1 | 8:57 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Guelph is like
The warmest month is July, with an average high of 28 °C83 °F and a low of 16 °C60 °F. The coldest is January, when highs average −3 °C27 °F and lows −10 °C13 °F. Seasons are strongly marked: the warmest month is on average 28.5 °C51.3 °F warmer than the coldest.
Annual precipitation is moderate at about 770 mm30 in. Rain is spread fairly evenly through the year. The wettest month is July (78 mm3.1 in), the driest is February (48 mm1.9 in).
Relative humidity ranges from 66% in July to 90% in January. The clearest skies (lowest average cloud amount, 50%) are typical of August. Average wind speed near the ground ranges from 9 km/h (5 mph) in August to 15 km/h (9 mph) in February. Daylight lasts from about 9.0 hours in December to 15.4 hours in June.
A lasting snow cover is typical in December–March, when the average snow depth in the reanalysis exceeds 10 cm (deepest in January, about 18 cm).
Best time to visit Guelph
Based on these averages, the most comfortable months for sightseeing and outdoor activities are June–September: average highs of 23 °C73 °F to 28 °C83 °F with 63 mm2.5 in to 78 mm3.1 in of precipitation per month.
The most challenging month is January, which is cold, with average highs of −3 °C27 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Guelph
- Winter (December–February) — highs −327 to 0 °C32 °F, lows −1112 to −6 °C20 °F, about 51 mm2.0 in of precipitation a month. Pack a winter coat, hat, gloves and warm, non-slip boots and shoes with good grip, as frost is common.
- Spring (March–May) — highs 438 to 19 °C66 °F, lows −621 to 6 °C43 °F, about 65 mm2.6 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket, an extra layer for the cooler mornings and evenings and shoes with good grip, as frost is common.
- Summer (June–August) — highs 2476 to 28 °C83 °F, lows 1254 to 16 °C60 °F, about 71 mm2.8 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an extra layer for the cooler mornings and evenings.
- Autumn (September–November) — highs 744 to 23 °C73 °F, lows −129 to 11 °C52 °F, about 69 mm2.7 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket and an extra layer for the cooler mornings and evenings.
How Guelph compares
Compared with Kitchener, about 25 km to the southwest, Guelph has practically the same average temperature and receives a similar amount of precipitation.
Of the 40 places in Canada covered by World Climates, Guelph is the 21st warmest by annual mean temperature and the 24th wettest by annual precipitation. See all of them on the Canada climate page.
Places in other countries with the most similar temperature and rainfall pattern: Green Bay (United States, Dfb), Obihiro (Japan, Dfb) and Ann Arbor (United States, Dfa).
Nearby places
- Kitchener 25 km · 8 °C46 °F · 762 mm30 in
- Brampton 42 km · 8 °C47 °F · 770 mm30 in
- Brantford 46 km · 9 °C48 °F · 791 mm31 in
- Toronto 71 km · 9 °C48 °F · 774 mm30 in
- Markham 87 km · 8 °C47 °F · 723 mm28 in
- St. Catharines 92 km · 10 °C50 °F · 872 mm34 in
- London 101 km · 9 °C48 °F · 660 mm26 in
- Ajax 104 km · 9 °C48 °F · 719 mm28 in
Frequently asked questions
What is the warmest month in Guelph?
July is the warmest month in Guelph, with an average high of 28 °C (83 °F) and an average low of 16 °C (60 °F).
What is the coldest month in Guelph?
January is the coldest month, with an average high of -3 °C (27 °F) and an average low of -10 °C (13 °F).
When does it rain the most in Guelph?
July is the wettest month with about 78 mm (3.1 in) of precipitation; February is the driest with about 48 mm (1.9 in).
What is the best time to visit Guelph?
Judging by long-term averages, the most comfortable months are June–September.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 267 m, while Guelph lies at about 335 m. Temperatures on this page were therefore adjusted by −0.4 °C0.8 °F using the standard lapse rate of 6.5 °C per 1,000 m.