July in Deerfield runs hotter than in 95% of Canadian towns
Nights in January average −8.9°C. The wettest month is June; the driest is February. Frosty nights are scarcer than in 82% of Canadian towns. Ice scrapers and block heaters earn their keep on roughly 131 days a year at 0°C or below.
Borrowed figures: Deerfield has no normals station, so these come from Toronto Pearson (Airport), 13 km south-east.
A year in Deerfield at a glance
Each month’s typical high and low, in °C.
What stands out about Deerfield’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Deerfield feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
131 frost days and 125 days above 20°C a year
From October to April frost is routine, and in January it comes on almost every night. Some 17 days a year climb past 30°C.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
Rain and melted snow: about 807 mm a year
Some 106 days a year see 1 mm of rain or snow or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
115 cm of snow in a typical year
The snow season runs November to April; January brings the most, about 32 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Deerfield
93% of a year’s heating need falls between October and April. Months averaging under 10°C: November to April.
Heating degree days total each day’s gap between its mean temperature and 18°C. That means homes here need less heating than 83% of Canadian towns.
Living with Deerfield’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
Gardens get from about 27 April to 20 October without frost, around 174 days in all.
Afternoons of 17–27°C and nights of at least 8°C arrive in May, Jun, Aug and Sep.
Parks & trails →The wind chill passes −20 on about 21 days in a normal year.
On some 56 days a year the humidex climbs past 30.
Thirty-year normals hide the storms and the extremes: the hazards page has Deerfield’s risks.
Flood & hazards →ECCC’s normals location: Toronto Pearson (Airport)
ECCC builds the Toronto Pearson (Airport) normals from 2 stations’ records over 1991–2020, joined where one replaced another.
| Distance from the town | 13 km south-east |
| Station altitude | 173 m |
| Completeness | at least 25 years |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −31.0°C |
| Hottest reading, 1991–2020 | 37.9°C |
| Average wind | 15.7 km/h on average, most often from the west |
| Next-nearest location | Toronto (City), 30 km |
How Deerfield 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 Deerfield’s own would show the same figures). The nearest places to Deerfield with figures are 21–30 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Deerfield Toronto Pearson (Airport) | 27.4°C | −8.9°C | 807 mm |
| Vaughan 21 km · Toronto Buttonville (Airport) | 27.3°C about the same | −10.1°C 1.2°C colder | 862 mm |
| Erin 26 km · Elora | 25.4°C 2.0°C cooler | −10.7°C 1.8°C colder | 807 mm |
| Milton 28 km · Burlington Piers | 25.5°C 1.9°C cooler | −6.3°C 2.6°C milder | 807 mm |
| Toronto 30 km · Toronto (City) | 27.0°C about the same | −6.7°C 2.2°C milder | 823 mm |
Deerfield 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 | −1.2°C | −8.9°C | −5.0°C | 62 mm | 32 cm |
| February | −0.3°C | −8.5°C | −4.4°C | 50 mm | 28 cm |
| March | 5.0°C | −3.8°C | 0.6°C | 51 mm | 17 cm |
| April | 12.0°C | 1.9°C | 7.0°C | 77 mm | 5 cm |
| May | 19.2°C | 8.2°C | 13.7°C | 78 mm | under 1 cm |
| June | 24.5°C | 13.9°C | 19.2°C | 81 mm | 0 cm |
| July | 27.4°C | 16.6°C | 22.1°C | 74 mm | 0 cm |
| August | 26.3°C | 15.8°C | 21.1°C | 69 mm | 0 cm |
| September | 22.3°C | 11.6°C | 16.9°C | 69 mm | 0 cm |
| October | 14.6°C | 5.3°C | 10.0°C | 67 mm | under 1 cm |
| November | 7.9°C | 0.2°C | 4.1°C | 72 mm | 9 cm |
| December | 1.9°C | −5.0°C | −1.6°C | 59 mm | 24 cm |
| Year | 13.3°C | 3.9°C | 8.6°C | 807 mm | 115 cm |
A January here can run warm or cold, its average moving by about 3.0°C; the steadiest month is June
Each bar spans a month’s coldest and warmest readings over thirty years; March’s run from −24.7°C in 2003 to 26.0°C in 2012.
Where Deerfield’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the Canadian Climate Normals, 1991–2020, at Toronto Pearson (Airport) (the closest location with all twelve months of temperatures).
- Comparisons: a pool of Canadian towns and neighbourhoods of 2,500 or more, read alike; whole cities and reserves stay out of it.
- 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 Deerfield’s climate
How warm does Deerfield get in summer?
The year’s warmest days come in July, with highs averaging 27.4°C.
How cold does Deerfield get in winter?
Deep winter means January, when nights average −8.9°C.
How much rain and snow does Deerfield get?
Rain and snow, with snow counted as water, total 807 mm a year; June leads with 81 mm and February trails with 50 mm.
How long does snow stay on the ground?
A layer of at least 1 cm stays down on about 69 days a year.
Are these figures for Deerfield itself?
They are the closest available: the normals for Toronto Pearson (Airport), since Deerfield has none.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Deerfield →
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).