Few Canadian towns have colder winter nights than Deer Lake
On a normal July day the thermometer tops out near 23.1°C. By July afternoons alone, it runs cooler than 88% of Canadian towns. Precipitation peaks in July and eases off in February. An umbrella or a shovel earns its place on about 94 days a year with 1 mm or more.
Far-off figures: ECCC’s closest normals for Deer Lake come from Island Lake, 142 km north, so take them as the area’s climate.
A year in Deer Lake at a glance
Each month’s typical high and low, in °C.
What stands out about Deer Lake’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Deer Lake feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
Frost on 206 days, 20°C on 70
The frost season runs September to May, and January freezes nearly every night. On about 81 nights a year the air falls below −20°C.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
About 567 mm of rain and snow a year
872nd wettest of 872 towns of 2,500+ in Ontario.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
Heating a home in Deer Lake
89% of a year’s heating need falls between October and April. Months averaging under 10°C: October to May.
Warm days count for nothing; each colder day adds how far its mean sits below 18°C. That means homes here need more heating than almost every Canadian town.
Living with Deer Lake’s climate
What the normals mean for a garden, a day outside and the depth of winter.
Between the last frost, near 24 May, and the first, near 29 September, lie about 127 frost-free days.
Mild days and mild nights together (17–27°C by day, 8°C or more at night) belong to Jun, Jul and Aug.
Parks & trails →Expect around 109 days a year when the wind chill sinks below −20.
On some 13 days a year the humidex climbs past 30.
Storms, floods and heat waves sit outside these normals; Deer Lake’s hazards page covers them.
Flood & hazards →ECCC’s normals location: Island Lake
ECCC builds the Island Lake normals from 3 stations’ records over 1991–2020, joined where one replaced another.
| Distance from the town | 142 km north |
| Station altitude | 235 m |
| Completeness | at least 20 years |
| WMO standard normals | No |
| Snowfall from | No location within 100 km |
| Coldest reading, 1991–2020 | −43.7°C |
| Hottest reading, 1991–2020 | 37.3°C |
| Average wind | 11.3 km/h on average, most often from the west |
| Next-nearest location | Red Lake, 174 km |
How Deer Lake compares
Compared with 2,611 towns and neighbourhoods of 2,500 or more across Canada; the dots mark the other normals locations in Ontario.
Nearby towns’ climate
Places around Deer Lake whose figures come from another normals location. Distances here run 91–117 km: that is how far the nearest places with figures are from Deer Lake.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Deer Lake Island Lake | 23.1°C | −26.3°C | 567 mm |
| Pikangikum 14 91 km · Red Lake | 24.0°C 0.9°C warmer | −23.5°C 2.8°C milder | 722 mm |
| Little Grand Rapids 14 117 km · Berens River | 23.3°C about the same | −23.4°C 2.9°C milder | 468 mm |
Deer Lake weather by month
Each month’s normals, 1991–2020: high, low, mean and precipitation.
| Month | High | Low | Mean | Rain & snow |
|---|---|---|---|---|
| January | −16.4°C | −26.3°C | −21.4°C | 22 mm |
| February | −12.4°C | −25.0°C | −18.7°C | 20 mm |
| March | −3.8°C | −17.2°C | −10.5°C | 24 mm |
| April | 5.6°C | −7.1°C | −0.7°C | 24 mm |
| May | 13.1°C | 1.3°C | 7.2°C | 48 mm |
| June | 20.1°C | 9.1°C | 14.6°C | 71 mm |
| July | 23.1°C | 13.2°C | 18.2°C | 99 mm |
| August | 21.5°C | 12.2°C | 16.9°C | 84 mm |
| September | 14.8°C | 6.5°C | 10.7°C | 62 mm |
| October | 5.8°C | −0.1°C | 2.8°C | 58 mm |
| November | −4.4°C | −10.9°C | −7.7°C | 31 mm |
| December | −13.2°C | −21.8°C | −17.5°C | 26 mm |
| Year | 4.5°C | −5.5°C | −0.5°C | 567 mm |
February varies most from one year to the next (4.1°C), August least
Records from 1991 to 2020: no month spans more than March, between −41.6°C (1995) and 19.3°C (2012).
Where Deer Lake’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s 1991–2020 Canadian Climate Normals for Island Lake, the nearest location with a full year 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: snow, with no complete snowfall normals within 100 km, sunshine, which ECCC published for no location, and any height adjustment.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Deer Lake’s climate
How warm does Deer Lake get in summer?
The year’s warmest days come in July, with highs averaging 23.1°C.
How cold does Deer Lake get in winter?
Winter bottoms out in January, with lows near −26.3°C.
How much rain and snow does Deer Lake get?
Over twelve months, rain and melted snow come to 567 mm; the range runs from 20 mm in February to 99 mm in July.
Are these figures for Deer Lake itself?
No. The nearest normals are those of Island Lake, a long way from Deer Lake.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Deer Lake →
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).