Port Colborne has warmer summer afternoons than 83% of Canadian towns
Deep winter brings January lows near −8.0°C. Rain or snow is most frequent in September and least in February. By January nights alone, it runs milder than 83% of Canadian towns. Have the furnace checked before November to April, the months that average under 10°C.
These are not Port Colborne’s own readings: ECCC keeps no normals there, so the page uses Welland-Pelham, 11 km north.
A year in Port Colborne at a glance
Each month’s typical high and low, in °C.
What stands out about Port Colborne’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Port Colborne feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
Frost on 134 days, 20°C on 129
The frost season runs October to May, and January freezes nearly every night. Heat of 30°C or more comes on about 10 days a year.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
Rain and melted snow: about 967 mm a year
Some 128 days a year see 1 mm of rain or snow or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
About 141 cm of snow a year
Snow falls from November to April, most of all in January (about 44 cm).
Snowfall by month
Centimetres
Heating a home in Port Colborne
93% of a year’s heating need falls between October and April. Months averaging under 10°C: November to April.
Degree days add up how far each day’s mean temperature falls below 18°C over a year. In heating terms, homes need less heating than 87% of Canadian towns.
Living with Port Colborne’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
Seedlings can go out once the average last frost, around 6 May, has passed; autumn’s first, near 14 October, ends a season of about 160 days.
Mild days and mild nights together (17–27°C by day, 8°C or more at night) belong to Jun, Jul, Aug and Sep.
Parks & trails →Averages smooth over blizzards, ice storms, floods and heat waves; Port Colborne’s hazards page covers the risks.
Flood & hazards →ECCC’s normals location: Welland-Pelham
Behind the 1991–2020 normals for Welland-Pelham are 2 stations, which ECCC combines into one record.
| Distance from the town | 11 km north |
| Station altitude | 175 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −31.9°C |
| Hottest reading, 1991–2020 | 35.5°C |
| Next-nearest location | Fort Erie, 22 km |
How Port Colborne 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 in Ontario.
Nearby towns’ climate
Nearby places read from a different ECCC location (places on Port Colborne’s own would show the same figures). Distances here run 20–38 km: that is how far the nearest places with figures are from Port Colborne.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Port Colborne Welland-Pelham | 26.8°C | −8.0°C | 967 mm |
| Fort Erie 20 km · Fort Erie | 26.0°C 0.8°C cooler | −7.5°C 0.5°C milder | 1,056 mm |
| St. Catharines 31 km · Vineland | 27.1°C about the same | −6.8°C 1.2°C milder | 838 mm |
Port Colborne 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 | −0.1°C | −8.0°C | −4.1°C | 82 mm | 44 cm |
| February | 0.6°C | −8.2°C | −3.8°C | 53 mm | 24 cm |
| March | 5.4°C | −4.0°C | 0.7°C | 70 mm | 28 cm |
| April | 12.5°C | 1.6°C | 7.1°C | 83 mm | 5 cm |
| May | 19.7°C | 7.8°C | 13.7°C | 81 mm | 0 cm |
| June | 24.5°C | 13.5°C | 19.0°C | 86 mm | 0 cm |
| July | 26.8°C | 16.2°C | 21.5°C | 84 mm | 0 cm |
| August | 26.1°C | 15.4°C | 20.7°C | 79 mm | 0 cm |
| September | 22.4°C | 11.5°C | 17.0°C | 96 mm | 0 cm |
| October | 15.4°C | 5.7°C | 10.6°C | 89 mm | under 1 cm |
| November | 8.6°C | 0.4°C | 4.5°C | 84 mm | 9 cm |
| December | 3.0°C | −4.2°C | −0.7°C | 82 mm | 32 cm |
| Year | 13.7°C | 4.0°C | 8.9°C | 967 mm | 141 cm |
A February here can run warm or cold, its average moving by about 3.1°C; the steadiest month is June
The thirty-year records stretch furthest in February: a low of −31.9°C in 2015 and a high of 20.5°C in 2000.
Where Port Colborne’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s 1991–2020 Canadian Climate Normals for Welland-Pelham, the nearest location with a full year of 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: a sunshine figure (ECCC published none for 1991–2020) and any lapse-rate correction for height, as the town has no elevation here.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Port Colborne’s climate
How warm does Port Colborne get in summer?
July is the warmest month, with average highs of 26.8°C.
How cold does Port Colborne get in winter?
The coldest nights come in February, averaging −8.2°C.
How much rain and snow does Port Colborne get?
Some 967 mm falls in a year. Most of it comes in September (96 mm), the least in February (53 mm).
Are these figures for Port Colborne itself?
They are borrowed from Welland-Pelham, the nearest place to Port Colborne where ECCC publishes 1991–2020 normals.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Port Colborne →
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).