Photo: Joe Mabel (on Flickr as Joe Mabel from Seattle, US) · CC BY-SA 3.0Whitby gets fewer frosts than 84% of Canadian towns
In July the day’s top temperature is typically 25.7°C. June is the wettest month, February the driest. An umbrella or a shovel earns its place on about 115 days a year with 1 mm or more.
These are not Whitby’s own readings: ECCC keeps no normals there, so the page uses Oshawa, 5.4 km east.
A year in Whitby at a glance
Each month’s typical high and low, in °C.
What stands out about Whitby’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Whitby feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
130 frost days and 107 days above 20°C a year
From October to April frost is routine, and in January it comes on almost every night. About 4 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
Rain and melted snow: about 906 mm a year
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
102 cm of snow in a typical year
From November to April snow is likely; January is the peak, at about 34 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Whitby
92% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Behind the figure: the degrees each day’s mean falls under 18°C, summed for the year. In heating terms, homes need less heating than 81% of Canadian towns.
Living with Whitby’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
Wait until about 30 April to plant out; frost tends to come back around 15 October, about 167 days later.
Highs of 17–27°C with nights of 8°C or more come in Jun, Jul, Aug and Sep.
Parks & trails →For the weather that does damage, from ice storms to floods, see Whitby’s hazards page.
Flood & hazards →ECCC’s normals location: Oshawa
ECCC builds the Oshawa normals from 2 stations’ records over 1991–2020, joined where one replaced another.
| Distance from the town | 5.4 km east |
| Station altitude | 140 m |
| Completeness | at least 20 years |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −28.0°C |
| Hottest reading, 1991–2020 | 37.1°C |
| Next-nearest location | Toronto Buttonville (Airport), 35 km |
How Whitby 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
The nearest places on a normals location of their own: those that share Whitby’s would only repeat its figures. The nearest places to Whitby with figures are 27–29 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Whitby Oshawa | 25.7°C | −8.9°C | 906 mm |
| Stouffville 27 km · Toronto Buttonville (Airport) | 27.3°C 1.6°C warmer | −10.1°C 1.2°C colder | 862 mm |
| Uxbridge 27 km · Udora | 26.3°C 0.6°C warmer | −11.7°C 2.8°C colder | 883 mm |
Whitby 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 | −1.1°C | −8.9°C | −5.0°C | 75 mm | 34 cm |
| February | −0.2°C | −8.3°C | −4.2°C | 54 mm | 26 cm |
| March | 4.5°C | −3.9°C | 0.3°C | 54 mm | 11 cm |
| April | 10.6°C | 1.7°C | 6.2°C | 87 mm | 2 cm |
| May | 17.5°C | 7.6°C | 12.6°C | 85 mm | 0 cm |
| June | 22.7°C | 12.9°C | 17.8°C | 94 mm | 0 cm |
| July | 25.7°C | 15.8°C | 20.9°C | 86 mm | 0 cm |
| August | 24.8°C | 15.4°C | 20.1°C | 74 mm | 0 cm |
| September | 20.9°C | 11.4°C | 16.2°C | 86 mm | 0 cm |
| October | 13.6°C | 5.3°C | 9.5°C | 72 mm | under 1 cm |
| November | 7.5°C | 0.3°C | 3.9°C | 73 mm | 5 cm |
| December | 2.2°C | −4.6°C | −1.2°C | 68 mm | 25 cm |
| Year | 12.4°C | 3.7°C | 8.1°C | 906 mm | 102 cm |
March has run from −25.2°C to 23.3°C in thirty years
From one year to the next, February’s average typically shifts by 3.0°C around its normal of −4.2°C, the widest of any month, while October’s shifts by 0.9°C.
Where Whitby’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s normals for Oshawa, 1991–2020, chosen as the nearest location with a full temperature record.
- 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 (no 1991–2020 normals exist for it) and any altitude adjustment, since there is no elevation for the town itself.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Whitby’s climate
How warm does Whitby get in summer?
Of all twelve months, July has the warmest afternoons, about 25.7°C.
How cold does Whitby get in winter?
In January, the coldest month, the typical low is −8.9°C.
How much rain and snow does Whitby get?
Some 906 mm falls in a year. Most of it comes in June (94 mm), the least in February (54 mm).
How long does snow stay on the ground?
Snow covers the ground, 1 cm or more, on about 55 days a year.
Are these figures for Whitby itself?
No, they come from Oshawa; ECCC keeps no 1991–2020 normals in Whitby itself.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Whitby →
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).