Photo: Gogerr · CC BY-SA 4.0Summer arrives in force in Thorold, hotter than in 83% of Canadian towns
Nights in January average −8.0°C. The wettest month is September; the driest is February. By January nights alone, it runs milder than 83% of Canadian towns. Windshields need scraping on about 134 mornings a year, the days the air reaches 0°C or below.
ECCC publishes no normals for Thorold itself; the figures are those of Welland-Pelham, 13 km south.
A year in Thorold at a glance
Each month’s typical high and low, in °C.
What stands out about Thorold’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Thorold feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
Frost on 134 days, 20°C on 129
Frost comes from October to May; in January almost every night freezes. About 10 days a year top 30°C.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
967 mm of precipitation in a typical year
About 128 days a year bring 1 mm or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
141 cm of snow in a typical year
The snow season runs November to April; January brings the most, about 44 cm.
Snowfall by month
Centimetres
Heating a home in Thorold
93% of a year’s heating need falls between October and April. Months averaging under 10°C: November to April.
One degree below 18°C for one day makes one heating degree day; the year’s days are added together. Homes here need less heating than 87% of Canadian towns.
Living with Thorold’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
Tender plants are usually safe from around 6 May until frost returns near 14 October: about 160 days.
For long days outdoors, Jun, Jul, Aug and Sep bring highs of 17–27°C and lows of 8°C or more.
Parks & trails →Storms, floods and heat waves sit outside these normals; Thorold’s hazards page covers them.
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 | 13 km south |
| 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 | Vineland, 18 km |
How Thorold compares
Placed among 2,611 Canadian towns and neighbourhoods of 2,500+, each on its nearest normals location; each dot is another location used in Ontario.
Nearby towns’ climate
The nearest places on a normals location of their own: those that share Thorold’s would only repeat its figures.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Thorold Welland-Pelham | 26.8°C | −8.0°C | 967 mm |
| St. Catharines 7.3 km · Vineland | 27.1°C about the same | −6.8°C 1.2°C milder | 838 mm |
| Niagara Falls 9.5 km · Welland-Pelham | 26.8°C about the same | −8.0°C about the same | 967 mm |
Thorold 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 |
In February, anything from −31.9°C to 20.5°C
Bars run from each month’s record low to its record high over 1991–2020; February is the month whose average wanders most from year to year (±3.1°C around −3.8°C), June the one that wanders least (±1.1°C).
Where Thorold’s numbers come from
Averages over 30 years, not a forecast.
- Normals: 1991–2020 normals for Welland-Pelham from ECCC’s climate data site, the nearest location with every month of temperature.
- Comparisons: Canada’s towns and neighbourhoods of 2,500+ (no city totals, no reserves), each through its own nearest location.
- Not on this page: sunshine, which none of ECCC’s 450 locations publishes for 1991–2020, and the town’s own height above sea level, so no figure is adjusted for altitude.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Thorold’s climate
How warm does Thorold get in summer?
Of all twelve months, July has the warmest afternoons, about 26.8°C.
How cold does Thorold get in winter?
Expect nights around −8.2°C in February; no month is colder.
How much rain and snow does Thorold get?
Over twelve months, rain and melted snow come to 967 mm; the range runs from 53 mm in February to 96 mm in September.
Are these figures for Thorold itself?
Not quite: they come from Welland-Pelham, the closest ECCC normals location to Thorold.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Thorold →
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).