Photo: Marty Aligata · CC BY-SA 4.0Wet weather: 1,263 mm of rain and snow a year falls on Belfast, more than on 92% of Canadian towns
Peak summer warmth arrives in July, with afternoons near 24.3°C. Seasons differ by 34°C, from the coldest nights to the warmest afternoons. Winters are mild: January nights here are milder than in 71% of Canadian towns. Warm coats and heating bills mark the months from October to April, when means dip under 10°C.
Borrowed figures: Belfast has no normals station, so these come from Alliston, 21 km east.
A year in Belfast at a glance
Each month’s typical high and low, in °C.
What stands out about Belfast’s climate
Compared with Canadian towns, with its place among towns of 2,500+ on Prince Edward Island beside it.
What a year in Belfast feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
147 frost days and 90 days above 20°C a year
The frost season runs October to May, and January freezes nearly 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
October brings the most rain and snow; March, the least. 2nd wettest of 13 towns of 2,500+ on Prince Edward Island. On about 141 days a year, 1 mm or more falls.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
248 cm of snow in a typical year
From November to April snow is likely; February is the peak, at about 68 cm. 12th snowiest of 13 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 Belfast
89% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Warm days count for nothing; each colder day adds how far its mean sits below 18°C. That means homes here need less heating than 67% of Canadian towns.
Living with Belfast’s climate
What the normals mean for a garden, a day outside and the depth of winter.
Frost usually lets go around 9 May and returns near 30 October, about 173 days apart.
Highs of 17–27°C with nights of 8°C or more come in Jun, Jul, Aug and Sep.
Parks & trails →Severe weather is a separate story from the averages: see Belfast’s hazards page.
Flood & hazards →ECCC’s normals location: Alliston
Alliston is one of the 450 places where ECCC publishes 1991–2020 normals.
| Distance from the town | 21 km east |
| 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 | Charlottetown (Airport), 32 km |
How Belfast compares
Compared with 2,611 towns and neighbourhoods of 2,500 or more across Canada; the dots mark the other normals locations on Prince Edward Island.
Nearby towns’ climate
Places around Belfast whose figures come from another normals location. The nearest place to Belfast with figures is 17 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Belfast Alliston | 24.3°C | −9.7°C | 1,263 mm |
| Vernon River 17 km · Charlottetown (Airport) | 23.6°C 0.7°C cooler | −11.5°C 1.8°C colder | 1,136 mm |
Belfast weather by month
Average daily high and low, mean temperature, rain and snow (as water) and snowfall by month, 1991–2020.
| 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 January here can run warm or cold, its average moving by about 2.2°C; the steadiest month is July
Records from 1991 to 2020: no month spans more than March, between −21.0°C (2007) and 24.5°C (2012).
Where Belfast’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the 1991–2020 normals from ECCC for Alliston, its nearest location with complete temperatures.
- Comparisons: the 2,500-plus towns and neighbourhoods of Canada, each read from its closest normals location; whole cities and reserves aren’t counted.
- 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 Belfast’s climate
How warm does Belfast get in summer?
Summer peaks in July: a typical afternoon reaches 24.3°C.
How cold does Belfast get in winter?
A typical February night falls to −9.8°C, the year’s low point.
How much rain and snow does Belfast get?
Over twelve months, rain and melted snow come to 1,263 mm; the range runs from 86 mm in March to 134 mm in October.
How long does snow stay on the ground?
Roughly 100 days a year start with snow cover of 1 cm or more.
Are these figures for Belfast itself?
No, they come from Alliston; ECCC keeps no 1991–2020 normals in Belfast itself.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Belfast →
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).