Photo: Emdx · CC BY-SA 4.0

Climate in Mistissini · ECCC 1991–2020 normals

Mistissini sits near the bottom of Canadian towns for winter warmth

July afternoons average 22.9°C. Some 47°C separates winter nights from summer afternoons. Summers stay cool: July afternoons here are cooler than in 92% of Canadian towns. Plan for rain or snow on about 124 days a year, the days with 1 mm or more.

July afternoons: cooler than 92% of Canadian towns

January nights: colder than almost every Canadian town

Rain and snow a year: wetter than 56% of Canadian towns

The nearest ECCC normals location is Chapais, 104 km south-west: at that distance its figures describe the region more than Mistissini itself.

July high

22.9°C

Typical Canadian town 25.5°C

January low

−24.1°C

Typical Canadian town −13.5°C

Rain & snow a year

911 mm

Typical Canadian town 883 mm

Frost days

215

a year at 0°C or below

A year in Mistissini at a glance

Each month’s typical high and low, in °C.

Jan−13°C−24°CColdest nights

Feb−10°C−23°C

Mar−3°C−17°C

Apr5°C−7°C

May15°C1°C

Jun21°C8°C

Jul23°C10°CWarmestWettest

Aug21°C9°C

Sep16°C5°C

Oct7°C−1°C

Nov now−1°C−8°C

Dec−8°C−18°C

What stands out about Mistissini’s climate

Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.

Colder than almost every Canadian townJanuary nights average −24.1°C, the coldest of the year. 509th mildest of 513 towns of 2,500+ in Quebec.A wider year than 96% of Canadian townsFrom January nights to July afternoons, the year spans 47.0°C.Cooler than 92% of Canadian townsJuly afternoons average 22.9°C, the warmest of the year.

A normal year

What a year in Mistissini feels like

Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.

Winter

−10°C / −22°C

166 mm of rain and snow

Spring

6°C / −7°C

193 mm of rain and snow

Summer

22°C / 9°C

302 mm of rain and snow, the wettest season

Autumn

7°C / −1°C

250 mm of rain and snow

−30°

−20°

−10°

0°

10°

20°

30°

−13°C−24°C

−10°C−23°C

−3°C−17°C

5°C−7°C

15°C1°C

21°C8°C

23°C10°C

21°C9°C

16°C5°C

7°C−1°C

−1°C−8°C

−8°C−18°C

JanFebMarAprMayJunJulAugSepOctNovDec

Best months to be outsideJulAugHighs of 17–27°C and nights of 8°C or more

Frost & warm days

215 frost days and 72 days above 20°C a year

From September to June frost is routine, and in January it comes on almost every night. Some 65 nights a year drop under −20°C.

215

Frost days a year (0°C or below)

More frosts than 98% of Canadian towns

130

Days that stay below 0°C

Nights a year below −20°C

Days a year above 20°C

Days a year above 30°C

Frost days by month

Average days at 0°C or below

JFMAMJJASOND

Days above 20°C by month

Average days

JFMAMJJASOND

Rain & snow

Rain and melted snow: about 911 mm a year

July brings the most rain and snow; February, the least.

911 mm

Rain and snow a year

Wetter than 56% of Canadian towns

645 mm

Of it as rain alone (71%)

112 mm

July, the wettest month

45 mm

February, the driest month

Rain and snow by month

Millimetres

112 mm

JFMAMJJASOND

Rain alone by month

Millimetres

112 mm

JFMAMJJASOND

Precipitation: Roberval, 239 km away (Chapais records no complete year of it).

Heating

Heating a home in Mistissini

87% of a year’s heating need falls between October and April. Months averaging under 10°C: October to May.

6,477 heating degree days (below 18°C)a year, 1991–2020

1,291 growing degree days (above 5°C)a year, 1991–2020

Every day colder than 18°C on average adds its gap in degrees to the year’s heating total. That means homes here need more heating than almost every Canadian town.

Living here

Living with Mistissini’s climate

The averages read for the garden, the outdoors and the coldest and hottest days.

Get outside

The outdoor season by the averages is Jul and Aug, with highs of 17–27°C and lows of 8°C or more.

Parks & trails →

Wind chill

A wind chill below −20 is part of about 85 days a year here.

Humidex

A humidex above 30 marks about 14 days in a normal year.

Storms and extremes

Thirty years of averages say little about one bad storm; Mistissini’s hazards page does.

Flood & hazards →

Weather station

ECCC’s normals location: Chapais

Chapais is a composite: ECCC joins 2 stations’ readings to make its 1991–2020 normals.

Distance from the town	104 km south-west
Station altitude	381 m
Completeness	meets the WMO “3 and 5” rule
WMO standard normals	No
Precipitation from	Roberval, 239 km
Snowfall from	No location within 100 km
Coldest reading, 1991–2020	−43.2°C
Hottest reading, 1991–2020	35.0°C
Average wind	6.3 km/h on average, most often from the west
Next-nearest location	Normandin, 198 km

Compared with other towns

How Mistissini compares

Compared with 2,611 towns and neighbourhoods of 2,500 or more across Canada; the dots mark the other normals locations in Quebec.

July afternoons22.9°C

MistissiniMedian Canadian town

18°C20°C22°C24°C26°C28°C

Cooler than 92% of Canadian towns

January nights−24.1°C

MistissiniMedian Canadian town

−30°C−25°C−20°C−15°C−10°C−5°C

Colder than almost every Canadian town509th mildest of 513 towns of 2,500+ in Quebec

Rain and snow a year911 mm

MistissiniMedian Canadian town

05001,0001,5002,000

Wetter than 56% of Canadian towns

Month by month

Mistissini weather by month

Each month’s normals, 1991–2020: high, low, mean and precipitation.

Month	High	Low	Mean	Rain & snow
January	−12.7°C	−24.1°C	−18.5°C	55 mm
February	−10.2°C	−23.0°C	−16.6°C	45 mm
March	−3.0°C	−16.7°C	−9.9°C	57 mm
April	5.1°C	−7.0°C	−1.0°C	64 mm
May	14.7°C	1.4°C	8.1°C	71 mm
June	21.2°C	7.5°C	14.4°C	87 mm
July	22.9°C	10.2°C	16.6°C	112 mm
August	21.0°C	9.2°C	15.1°C	104 mm
September	15.9°C	4.8°C	10.4°C	99 mm
October	7.3°C	−0.5°C	3.4°C	81 mm
November	−1.1°C	−8.0°C	−4.5°C	71 mm
December	−8.4°C	−17.6°C	−13.0°C	66 mm
Year	6.1°C	−5.3°C	0.4°C	911 mm

Year to year

January strays furthest from its normal year to year, by 3.6°C; July the least

Each bar spans a month’s coldest and warmest readings over thirty years; March’s run from −40.9°C in 2007 to 22.5°C in 2012.

−50°

−40°

−30°

−20°

−10°

0°

10°

20°

30°

40°

JanFebMarAprMayJunJulAugSepOctNovDec

Record low to record high, 1991–2020Normal

Sources

Where Mistissini’s numbers come from

Averages over 30 years, not a forecast.

Normals: ECCC’s normals for Chapais, 1991–2020, chosen as the nearest location with a full temperature record.
Other locations: a location missing months of precipitation or snow is filled from the nearest that has them all, never mixed month by month.
Comparisons: Canada’s towns and neighbourhoods of 2,500+ (no city totals, no reserves), each through its own nearest location.
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 Mistissini’s climate

How warm does Mistissini get in summer?

Summer peaks in July: a typical afternoon reaches 22.9°C.

How cold does Mistissini get in winter?

Midwinter means January, when a typical night reaches −24.1°C.

How much rain and snow does Mistissini get?

The yearly total is about 911 mm. July gets 112 mm, the most of any month; February gets 45 mm, the least.

Are these figures for Mistissini itself?

They are the figures for Chapais, which read better as the region’s climate than Mistissini’s own.

Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Mistissini →

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).