Photo: Sdeschenes at English Wikipedia · CC BY-SA 3.0A middle-of-the-road climate: East Gwillimbury is close to most Canadian towns on every count
January nights average −11.7°C, July afternoons 26.3°C, and a year brings 883 mm of rain and melted snow. Seasons differ by 38°C, from the coldest nights to the warmest afternoons. In July, afternoons here are warmer than in 63% of Canadian towns. The heating season runs October to April: each of those months averages under 10°C.
ECCC publishes no normals for East Gwillimbury itself; the figures are those of Udora, 27 km north-east.
A year in East Gwillimbury at a glance
Each month’s typical high and low, in °C.
What stands out about East Gwillimbury’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in East Gwillimbury feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
About 159 frosts and 121 warm days a year
The frost season runs October to May, and January freezes nearly every night. Deep cold, under −20°C, comes on about 10 nights 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 883 mm a year
June is the wettest month and March the driest. On about 129 days a year, 1 mm or more falls.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
167 cm of snow in a typical year
Snow falls from October to April, most of all in January (about 42 cm).
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in East Gwillimbury
92% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
One degree below 18°C for one day makes one heating degree day; the year’s days are added together. That means homes here need less heating than 67% of Canadian towns.
Living with East Gwillimbury’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
The outdoor season by the averages is Jun, Jul, Aug and Sep, with highs of 17–27°C and lows of 8°C or more.
Parks & trails →For blizzards, floods and wildfire, turn to East Gwillimbury’s hazards page.
Flood & hazards →ECCC’s normals location: Udora
Udora is one of the 450 places where ECCC publishes 1991–2020 normals.
| Distance from the town | 27 km north-east |
| Station altitude | 262 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | Yes |
| Coldest reading, 1991–2020 | −34.0°C |
| Hottest reading, 1991–2020 | 36.0°C |
| Next-nearest location | Toronto Buttonville (Airport), 28 km |
How East Gwillimbury 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
Places around East Gwillimbury whose figures come from another normals location.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| East Gwillimbury Udora | 26.3°C | −11.7°C | 883 mm |
| Newmarket 7.3 km · Toronto Buttonville (Airport) | 27.3°C 1.0°C warmer | −10.1°C 1.6°C milder | 862 mm |
| Bradford 12 km · Egbert | 26.0°C about the same | −11.3°C about the same | 793 mm |
| Keswick 18 km · Udora | 26.3°C about the same | −11.7°C about the same | 883 mm |
East Gwillimbury 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 | −3.1°C | −11.7°C | −7.2°C | 67 mm | 42 cm |
| February | −1.8°C | −11.2°C | −6.5°C | 51 mm | 36 cm |
| March | 3.9°C | −6.1°C | −1.0°C | 50 mm | 21 cm |
| April | 11.4°C | 0.2°C | 5.8°C | 69 mm | 8 cm |
| May | 19.0°C | 6.5°C | 12.8°C | 80 mm | under 1 cm |
| June | 24.0°C | 11.8°C | 17.9°C | 103 mm | 0 cm |
| July | 26.3°C | 14.2°C | 20.3°C | 86 mm | 0 cm |
| August | 25.4°C | 13.4°C | 19.5°C | 82 mm | 0 cm |
| September | 21.5°C | 9.7°C | 15.6°C | 80 mm | 0 cm |
| October | 13.7°C | 4.2°C | 9.0°C | 78 mm | 2 cm |
| November | 6.5°C | −1.5°C | 2.5°C | 73 mm | 19 cm |
| December | 0.1°C | −7.1°C | −3.5°C | 64 mm | 40 cm |
| Year | 12.2°C | 1.9°C | 7.1°C | 883 mm | 167 cm |
A March here can run from −33.0°C to 27.0°C
January is the least predictable month: about two years in three its average lands within 3.0°C of the normal, −7.2°C. June is the steadiest, within 1.2°C.
Where East Gwillimbury’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s 1991–2020 Canadian Climate Normals for Udora, 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: sunshine, absent from every 1991–2020 location, and an altitude correction, for want of the town’s own elevation.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about East Gwillimbury’s climate
How warm does East Gwillimbury get in summer?
July is the warmest month, with average highs of 26.3°C.
How cold does East Gwillimbury get in winter?
Overnight lows average −11.7°C in January, the coldest month.
How much rain and snow does East Gwillimbury get?
About 883 mm a year, rain and melted snow together. June is the wettest month (103 mm) and March the driest (50 mm).
How long does snow stay on the ground?
About 98 days a year count as snow-covered, with 1 cm or more.
Are these figures for East Gwillimbury itself?
Only indirectly: the readings are made at Udora, outside East Gwillimbury.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for East Gwillimbury →
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).