Photo: Dennis G. Jarvis · CC BY-SA 2.0Precipitation in Three Rivers tops that of 92% of Canadian towns: 1,263 mm a year
In January the night’s low is typically −9.7°C. Of the 12 towns of 2,500+ on Prince Edward Island, it has the mildest January nights. A year here swings 34°C from midwinter lows to midsummer highs. For walks and days out, the stretch from June to September brings highs of 20–24°C.
Borrowed figures: Three Rivers has no normals station, so these come from Alliston, 13 km south.
A year in Three Rivers at a glance
Each month’s typical high and low, in °C.
What stands out about Three Rivers’s climate
Compared with Canadian towns, with its place among towns of 2,500+ on Prince Edward Island beside it.
What a year in Three Rivers feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
147 frost days and 90 days above 20°C a year
From October to May frost is routine, and in January it comes on almost every night.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
1,263 mm of precipitation in a typical year
The most falls in October, the least in March. 2nd wettest of 12 towns of 2,500+ on Prince Edward Island. Some 141 days a year see 1 mm of rain or snow or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
Snowfall: about 248 cm in a normal year
From November to April snow is likely; February is the peak, at about 68 cm. 12th snowiest of 12 towns of 2,500+ on Prince Edward Island.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Three Rivers
89% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Think of it as a year’s worth of daily shortfalls below 18°C, added up. By this count, homes here need less heating than 67% of Canadian towns.
Living with Three Rivers’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
From about 9 May to 30 October the garden is usually clear of frost, some 173 days.
The comfortable months for a day outside, highs of 17–27°C and nights of 8°C or more: Jun, Jul, Aug and Sep.
Parks & trails →For blizzards, floods and wildfire, turn to Three Rivers’s hazards page.
Flood & hazards →ECCC’s normals location: Alliston
The page’s figures are ECCC’s 1991–2020 normals for Alliston, one of its 450 normals locations.
| Distance from the town | 13 km south |
| Station altitude | 61 m |
| Completeness | at least 20 years |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −26.0°C |
| Hottest reading, 1991–2020 | 35.0°C |
| Next-nearest location | St. Peters/Monticello, 34 km |
How Three Rivers compares
Against the 2,611 Canadian towns and neighbourhoods of 2,500 or more, each read from its own normals location; the dots are the other locations those towns use on Prince Edward Island.
Nearby towns’ climate
Nearby places read from a different ECCC location (places on Three Rivers’s own would show the same figures). The nearest places to Three Rivers with figures are 21–27 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Three Rivers Alliston | 24.3°C | −9.7°C | 1,263 mm |
| Vernon River 21 km · Charlottetown (Airport) | 23.6°C 0.7°C cooler | −11.5°C 1.8°C colder | 1,136 mm |
| Morell 26 km · St. Peters/Monticello | 23.4°C 0.9°C cooler | −9.9°C about the same | 1,116 mm |
Three Rivers weather by month
Month by month, 1991–2020: the usual high, low and mean, the rain and snow, and the snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −2.0°C | −9.7°C | −5.8°C | 94 mm | 60 cm |
| February | −1.8°C | −9.8°C | −5.8°C | 98 mm | 68 cm |
| March | 2.0°C | −5.6°C | −1.8°C | 86 mm | 42 cm |
| April | 7.8°C | −0.3°C | 3.8°C | 92 mm | 14 cm |
| May | 14.9°C | 5.1°C | 10.0°C | 89 mm | 1 cm |
| June | 20.0°C | 10.4°C | 15.2°C | 99 mm | 0 cm |
| July | 24.3°C | 15.2°C | 19.8°C | 93 mm | 0 cm |
| August | 24.0°C | 15.1°C | 19.6°C | 94 mm | 0 cm |
| September | 19.8°C | 11.5°C | 15.7°C | 131 mm | 0 cm |
| October | 13.3°C | 6.3°C | 9.8°C | 134 mm | under 1 cm |
| November | 7.4°C | 1.1°C | 4.2°C | 124 mm | 14 cm |
| December | 1.8°C | −4.7°C | −1.5°C | 131 mm | 50 cm |
| Year | 11.0°C | 2.9°C | 6.9°C | 1,263 mm | 248 cm |
A March here can run from −21.0°C to 24.5°C
Bars run from each month’s record low to its record high over 1991–2020; January is the month whose average wanders most from year to year (±2.2°C around −5.8°C), July the one that wanders least (±1.1°C).
Where Three Rivers’s numbers come from
Averages over 30 years, not a forecast.
- Normals: Environment and Climate Change Canada’s 1991–2020 normals, Alliston: the nearest of its locations with every month’s temperatures.
- Comparisons: the towns and neighbourhoods of 2,500+ across Canada, each on its nearest normals location, without the city totals or the reserves.
- Not on this page: sunshine (no 1991–2020 normals exist for it) and any altitude adjustment, since there is no elevation for the town itself.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Three Rivers’s climate
How warm does Three Rivers get in summer?
Peak warmth comes in July, at about 24.3°C by mid-afternoon.
How cold does Three Rivers get in winter?
The coldest nights come in February, averaging −9.8°C.
How much rain and snow does Three Rivers get?
1,263 mm a year counting snow as water. The wettest month is October (134 mm); the driest, March (86 mm).
How long does snow stay on the ground?
Snow cover of 1 cm or more lasts about 100 days in a typical year.
Are these figures for Three Rivers itself?
They come from Alliston, which ECCC uses as the nearest normals location for Three Rivers.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Three Rivers →
Adapted from Statistics Canada (Census of Population 2021, population estimates 2025, 2021 census boundaries) under the Statistics Canada Open Licence; this does not constitute an endorsement by Statistics Canada. Neighbourhood names in some cities © OpenStreetMap contributors (ODbL).