Photo: Earth Science and Remote Sensing Unit , Lyndon B. Johnson Space Center · Public domain

Climate in Prince William · ECCC 1991–2020 normals

Summers, winters, rain and snow in Prince William all run close to those of most Canadian towns

July afternoons reach 25.9°C on a typical day and January nights drop to −14.6°C; 1,022 mm of rain and melted snow falls in a year. Its yearly rain and snow top those of 70% of Canadian towns. The gap between a January night and a July afternoon is 41°C. Expect about 172 frosty starts a year, days when the air falls to freezing.

July afternoons: warmer than 60% of Canadian towns

January nights: colder than 62% of Canadian towns

Rain and snow a year: wetter than 70% of Canadian towns

These are not Prince William’s own readings: ECCC keeps no normals there, so the page uses Fredericton (Airport), 37 km east.

July high

25.9°C

Typical Canadian town 25.5°C

January low

−14.6°C

Typical Canadian town −13.5°C

Rain & snow a year

1,022 mm

Typical Canadian town 883 mm

Snowfall a year

241 cm

Typical Canadian town 141 cm

Frost days

172

a year at 0°C or below

Frost-free days

135

14 May to 27 Sep

A year in Prince William at a glance

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

Jan−4°C−15°CColdest nightsSnowiest

Feb−2°C−14°C

Mar3°C−8°C

Apr10°C−1°C

May18°C5°CLast frost ~14 May

Jun23°C10°C

Jul26°C13°CWarmest

Aug25°C12°C

Sep21°C8°CFirst frost ~27 Sep

Oct14°C2°CWettest

Nov now6°C−3°C

Dec0°C−10°C

What stands out about Prince William’s climate

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

Snowier than 87% of Canadian townsAbout 241 cm of snow falls in a year, most of it in January.Wetter than 70% of Canadian townsAbout 1,022 mm of rain and melted snow a year; October is the wettest month and February the driest.A wider year than 67% of Canadian townsFrom January nights to July afternoons, the year spans 40.5°C.

A normal year

What a year in Prince William feels like

Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.

Winter

−2°C / −13°C

242 mm, with 164 cm of snow

Spring

10°C / −1°C

245 mm, with 64 cm of snow

Summer

25°C / 12°C

243 mm of rain and snow

Autumn

14°C / 2°C

293 mm, with 14 cm of snow: the wettest season

−20°

−10°

0°

10°

20°

30°

−4°C−15°C

−2°C−14°C

3°C−8°C

10°C−1°C

18°C5°C

23°C10°C

26°C13°C

25°C12°C

21°C8°C

14°C2°C

6°C−3°C

0°C−10°C

JanFebMarAprMayJunJulAugSepOctNovDec

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

Frost & warm days

Frost on 172 days, 20°C on 108

Frost comes from September to May; in January almost every night freezes. On about 17 nights a year the air falls below −20°C.

135 frost-free days · average dates, 1991–2020

14 May 27 Sep

JanFebMarAprMayJunJulAugSepOctNovDec

172

Frost days a year (0°C or below)

More frosts than 59% of Canadian towns

Days that stay below 0°C

Nights a year below −20°C

108

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

1,022 mm of precipitation in a typical year

October is the wettest month and February the driest. Some 108 days a year see 1 mm of rain or snow or more.

1,022 mm

Rain and snow a year

Wetter than 70% of Canadian towns

851 mm

Of it as rain alone (83%)

106 mm

October, the wettest month

63 mm

February, the driest month

Rain and snow by month

Millimetres

106 mm

JFMAMJJASOND

Rain alone by month

Millimetres

109 mm

JFMAMJJASOND

Snow

About 241 cm of snow a year

The snow season runs November to April; January brings the most, about 64 cm.

241 cm

Snowfall a year

Snowier than 87% of Canadian towns

Days a year with 0.2 cm of snow or more

109

Days a year with 1 cm or more on the ground

22 cm

Snow on the ground at the end of February, the deepest month

Snowfall by month

Centimetres

64 cm

JFMAMJJASOND

Snow on the ground by month

Centimetres at month’s end

22 cm

JFMAMJJASOND

Heating

Heating a home in Prince William

90% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.

4,601 heating degree days (below 18°C)a year, 1991–2020

1,842 growing degree days (above 5°C)a year, 1991–2020

One degree below 18°C for one day makes one heating degree day; the year’s days are added together.

Living here

Living with Prince William’s climate

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

The garden window

Frost usually lets go around 14 May and returns near 27 September, about 135 days apart.

Get outside

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 →

Wind chill

On some 41 days a year the wind chill drops past −20; mitts and a scarf earn their place.

Humidex

Count on some 37 humid days a year with the humidex past 30.

Storms and extremes

A normal year has no blizzard, flood or heat wave in it; Prince William’s hazards page looks at those.

Flood & hazards →

Weather station

ECCC’s normals location: Fredericton (Airport)

Fredericton (Airport) is a composite: ECCC joins 2 stations’ readings to make its 1991–2020 normals.

Distance from the town	37 km east
Station altitude	21 m
Completeness	meets the WMO “3 and 5” rule
WMO standard normals	No
Coldest reading, 1991–2020	−34.5°C
Hottest reading, 1991–2020	36.4°C
Average wind	12.2 km/h on average, most often from the south
Next-nearest location	Woodstock/Newbridge, 55 km

Compared with other towns

How Prince William 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 New Brunswick.

July afternoons25.9°C

Prince WilliamMedian Canadian town

18°C20°C22°C24°C26°C

Warmer than 60% of Canadian townsThe warmest of 61 towns of 2,500+ in New Brunswick

January nights−14.6°C

Prince WilliamMedian Canadian town

−20°C−15°C−10°C−5°C

Colder than 62% of Canadian towns

Rain and snow a year1,022 mm

Prince WilliamMedian Canadian town

05001,0001,5002,000

Wetter than 70% of Canadian towns

Snowfall a year241 cm

Prince WilliamMedian Canadian town

100200300400

Snowier than 87% of Canadian towns

Next door

Nearby towns’ climate

Nearby places read from a different ECCC location (places on Prince William’s own would show the same figures). Distances here run 24–48 km: that is how far the nearest places with figures are from Prince William.

Town	July high	January low	Rain & snow
Prince William Fredericton (Airport)	25.9°C	−14.6°C	1,022 mm
Nackawic 24 km · Woodstock/Newbridge	25.3°C 0.6°C cooler	−15.3°C 0.7°C colder	1,161 mm
McAdam 37 km · St. Stephen	25.7°C about the same	−13.6°C 1.0°C milder	1,161 mm

Month by month

Prince William 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	−3.8°C	−14.6°C	−9.2°C	86 mm	64 cm
February	−2.3°C	−13.9°C	−8.1°C	63 mm	49 cm
March	3.3°C	−7.8°C	−2.1°C	88 mm	46 cm
April	10.2°C	−1.1°C	4.6°C	77 mm	17 cm
May	17.6°C	4.7°C	11.2°C	79 mm	1 cm
June	22.8°C	9.9°C	16.4°C	83 mm	0 cm
July	25.9°C	13.4°C	19.7°C	94 mm	0 cm
August	25.3°C	12.3°C	18.9°C	66 mm	0 cm
September	20.7°C	7.6°C	14.2°C	90 mm	0 cm
October	13.5°C	1.9°C	7.7°C	106 mm	1 cm
November	6.3°C	−2.9°C	1.7°C	97 mm	13 cm
December	−0.3°C	−9.6°C	−5.0°C	93 mm	52 cm
Year	11.6°C	0.0°C	5.8°C	1,022 mm	241 cm

Year to year

March: −27.4°C at its coldest, 27.2°C at its warmest

The month to count on least is January: one year in three its average strays more than 2.5°C from −9.2°C. August moves least, typically by 0.9°C.

−40°

−30°

−20°

−10°

0°

10°

20°

30°

40°

JanFebMarAprMayJunJulAugSepOctNovDec

Record low to record high, 1991–2020Normal

Sources

Where Prince William’s numbers come from

Averages over 30 years, not a forecast.

Normals: the Canadian Climate Normals, 1991–2020, at Fredericton (Airport) (the closest location with all twelve months of temperatures).
Comparisons: every Canadian town and neighbourhood of 2,500 or more, each read from its own nearest location; city totals and reserves are left out.
Not on this page: hours of sunshine, missing from the 1991–2020 normals, and a height correction: the town has no elevation on file.

Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada

Questions about Prince William’s climate

How warm does Prince William get in summer?

Peak warmth comes in July, at about 25.9°C by mid-afternoon.

How cold does Prince William get in winter?

Overnight lows average −14.6°C in January, the coldest month.

How much rain and snow does Prince William get?

The year adds up to 1,022 mm. October is the peak month (106 mm) and February the low one (63 mm).

How long does snow stay on the ground?

The ground is white, with 1 cm or more, on some 109 days a year.

Are these figures for Prince William itself?

No, they come from Fredericton (Airport); ECCC keeps no 1991–2020 normals in Prince William itself.

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

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).