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

Climate in Saint Marys · ECCC 1991–2020 normals

Neither notably warm, cold, wet nor dry, Saint Marys sits near the middle of Canadian towns

A typical January night drops to −14.6°C and a July afternoon reaches 25.9°C; 1,022 mm of rain and snow falls in a year. By precipitation alone, it ranks wetter than 70% of Canadian towns. October is the wettest month, February the driest. Ice scrapers and block heaters earn their keep on roughly 172 days a year at 0°C or below.

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

Borrowed figures: Saint Marys has no normals station, so these come from Fredericton (Airport), 21 km south.

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 Saint Marys 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 Saint Marys’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 Saint Marys feels like

Each season’s and each month’s usual high and low, 1991–2020.

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. Some 17 nights a year drop under −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

About 1,022 mm of rain and snow a year

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

Snowfall: about 241 cm in a normal year

Expect snow from November to April, with about 64 cm in January, the snowiest month.

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 Saint Marys

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

A day averaging 10 degrees under 18°C adds 10 to the total; warm days add nothing.

Living here

Living with Saint Marys’s climate

Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.

The garden window

The frost-free stretch runs from about 14 May to about 27 September, some 135 days in a normal year.

Get outside

Plan time outside for Jun, Jul and Aug: highs of 17–27°C and nights no colder than 8°C.

Parks & trails →

Wind chill

Frostbite weather, a wind chill under −20, turns up on about 41 days a year.

Humidex

Humid summer days, the humidex above 30, number about 37 a year.

Storms and extremes

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

Flood & hazards →

Weather station

ECCC’s normals location: Fredericton (Airport)

Behind the 1991–2020 normals for Fredericton (Airport) are 2 stations, which ECCC combines into one record.

Distance from the town	21 km south
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	Doaktown, 63 km

Compared with other towns

How Saint Marys compares

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

July afternoons25.9°C

Saint MarysMedian Canadian town

18°C20°C22°C24°C26°C

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

January nights−14.6°C

Saint MarysMedian Canadian town

−20°C−15°C−10°C−5°C

Colder than 62% of Canadian towns

Rain and snow a year1,022 mm

Saint MarysMedian Canadian town

05001,0001,5002,000

Wetter than 70% of Canadian towns

Snowfall a year241 cm

Saint MarysMedian Canadian town

100200300400

Snowier than 87% of Canadian towns

Next door

Nearby towns’ climate

Places around Saint Marys whose figures come from another normals location. Distances here run 53–69 km: that is how far the nearest places with figures are from Saint Marys.

Town	July high	January low	Rain & snow
Saint Marys Fredericton (Airport)	25.9°C	−14.6°C	1,022 mm
Upper Miramichi 53 km · Doaktown	25.8°C about the same	−16.0°C 1.4°C colder	1,210 mm
Nackawic 54 km · Woodstock/Newbridge	25.3°C 0.6°C cooler	−15.3°C 0.7°C colder	1,161 mm
Springfield 69 km · Sussex/Four Corners	25.7°C about the same	−13.2°C 1.4°C milder	1,152 mm

Month by month

Saint Marys 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	−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

The most changeable month: January, give or take 2.5°C; the steadiest, August

Bars run from each month’s record low to its record high since 1991. March spans the most, from −27.4°C (2014) to 27.2°C (2012).

−40°

−30°

−20°

−10°

0°

10°

20°

30°

40°

JanFebMarAprMayJunJulAugSepOctNovDec

Record low to record high, 1991–2020Normal

Sources

Where Saint Marys’s numbers come from

Averages over 30 years, not a forecast.

Normals: the closest ECCC location with twelve months of temperature normals, Fredericton (Airport), 1991–2020.
Comparisons: all Canadian places of 2,500 or more except city totals and reserves, each read the same way.
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 Saint Marys’s climate

How warm does Saint Marys get in summer?

Summer peaks in July: a typical afternoon reaches 25.9°C.

How cold does Saint Marys get in winter?

Lows sink to −14.6°C on an average January night.

How much rain and snow does Saint Marys get?

Precipitation totals 1,022 mm a year, with October the wettest month (106 mm) and February the driest (63 mm).

How long does snow stay on the ground?

Around 109 days a year see 1 cm of snow or more lying.

Are these figures for Saint Marys itself?

They describe Fredericton (Airport), the nearest normals location, rather than Saint Marys itself.

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

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).