Frosty mornings in Southwold are scarcer than in 75% of Canadian towns
In July the day’s top temperature is typically 26.6°C. Summer afternoons here are warmer than in 70% of Canadian towns. No month is much wetter than another: September, the wettest, gets little more than February, the driest. An umbrella or a shovel earns its place on about 128 days a year with 1 mm or more.
ECCC publishes no normals for Southwold itself; the figures are those of London, 35 km north-east.
A year in Southwold at a glance
Each month’s typical high and low, in °C.
What stands out about Southwold’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Southwold feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
139 frost days and 128 days above 20°C a year
The frost season runs October to May, and January freezes nearly every night. Heat of 30°C or more comes on about 11 days a year.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
About 962 mm of rain and snow a year
Rain and snow by month
Millimetres
Snowfall: about 152 cm in a normal year
The snow season runs October to April; January brings the most, about 43 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
ECCC’s London normals leave snowfall out; the figures here come from Strathroy-Mullifarry, 36 km away.
Heating a home in Southwold
92% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
The count adds up, day by day, how far the mean temperature falls short of 18°C. In heating terms, homes need less heating than 79% of Canadian towns.
Living with Southwold’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
Count on about 165 frost-free days: the last frost averages 3 May, the first 16 October.
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 →Winter brings about 18 days with a wind chill below −20.
Roughly 55 days a year feel hotter than 30 once humidity is counted.
The normals describe a typical year, not its worst days; the hazards page covers Southwold’s.
Flood & hazards →ECCC’s normals location: London
London is a composite: ECCC joins 3 stations’ readings to make its 1991–2020 normals.
| Distance from the town | 35 km north-east |
| Station altitude | 278 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Snowfall from | Strathroy-Mullifarry, 36 km |
| Coldest reading, 1991–2020 | −29.1°C |
| Hottest reading, 1991–2020 | 37.0°C |
| Average wind | 14.0 km/h on average, most often from the west |
| Next-nearest location | Strathroy-Mullifarry, 36 km |
How Southwold 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
Nearby places read from a different ECCC location (places on Southwold’s own would show the same figures).
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Southwold London | 26.6°C | −9.1°C | 962 mm |
| Oneida 41 12 km · Strathroy-Mullifarry | 27.3°C 0.7°C warmer | −8.5°C 0.6°C milder | 966 mm |
| St. Thomas 13 km · London | 26.6°C about the same | −9.1°C about the same | 962 mm |
| Dutton 17 km · New Glasgow | 26.2°C about the same | −7.4°C 1.7°C milder | 927 mm |
Southwold 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 | −1.6°C | −9.1°C | −5.4°C | 79 mm | 43 cm |
| February | −0.6°C | −9.0°C | −4.8°C | 63 mm | 32 cm |
| March | 4.6°C | −4.5°C | 0.1°C | 67 mm | 20 cm |
| April | 12.2°C | 1.4°C | 6.8°C | 89 mm | 5 cm |
| May | 19.3°C | 7.7°C | 13.5°C | 89 mm | under 1 cm |
| June | 24.4°C | 13.2°C | 18.8°C | 86 mm | 0 cm |
| July | 26.6°C | 15.3°C | 21.0°C | 81 mm | 0 cm |
| August | 25.7°C | 14.4°C | 20.1°C | 67 mm | 0 cm |
| September | 22.1°C | 10.5°C | 16.3°C | 93 mm | 0 cm |
| October | 14.7°C | 5.0°C | 9.9°C | 83 mm | 2 cm |
| November | 7.5°C | −0.3°C | 3.6°C | 88 mm | 13 cm |
| December | 1.4°C | −5.2°C | −2.0°C | 79 mm | 37 cm |
| Year | 13.0°C | 3.3°C | 8.2°C | 962 mm | 152 cm |
In March, anything from −25.6°C to 27.2°C
Two years in three, February’s average falls within 3.0°C of its normal of −4.8°C; June keeps to within 1.1°C.
Where Southwold’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s normals for London, 1991–2020, chosen as the nearest location with a full temperature record.
- Other locations: where a location publishes no full year of precipitation or snowfall, the nearest one that does supplies it, named beside those figures.
- Comparisons: all Canadian places of 2,500 or more except city totals and reserves, each read the same way.
- 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 Southwold’s climate
How warm does Southwold get in summer?
July is the warmest month, with average highs of 26.6°C.
How cold does Southwold get in winter?
Lows sink to −9.1°C on an average January night.
How much rain and snow does Southwold get?
Precipitation totals 962 mm a year, with September the wettest month (93 mm) and February the driest (63 mm).
Are these figures for Southwold itself?
Not quite: they come from London, the closest ECCC normals location to Southwold.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Southwold →
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).