Frost Dates for Ayer's Cliff, Canada

Based on data from Magog weather station, 8 miles away

Frost Dates

Last Spring Frost (50%) iA 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. May 13
First Fall Frost (50%) iA 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. October 1
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30% Probability iOnly a 30% chance of frost remaining by this date. Use these dates for a safer planting window, especially for tender plants sensitive to cold.

Last Spring Frost May 18
First Fall Frost September 27

Hard Freeze (−2°C)

Last Spring Hard Freeze April 26
First Fall Hard Freeze October 16
45.17°N, -72.04°W © OpenStreetMap

Growing Season

141 Days May 13 to October 1

USDA Hardiness Zone iHardiness zones indicate which perennial plants can survive winter in your area. For annual vegetables, frost dates and growing season length matter more than hardiness zone.

Zone 4b

Avg. annual minimum: −25 to −20°F (−32 to −29°C)

Learn more

Köppen Climate iThe Köppen climate classification system categorizes climates based on temperature and precipitation patterns.

Dfb Warm-Summer Continental

Warm summers and cold, snowy winters. A shorter growing season than hot-summer continental. Hardy vegetables, root crops, and cool-season greens do well. Season extension is valuable.

Köppen climate map

Temperature

-15° 0° 15° 30°
-10°
High: -5°C
Avg: -10°C
Low: -14°C
Jan
-8°
High: -3°C
Avg: -8°C
Low: -13°C
Feb
-2°
High: 2°C
Avg: -2°C
Low: -7°C
Mar
5°
High: 10°C
Avg: 5°C
Low: 0°C
Apr
12°
High: 18°C
Avg: 12°C
Low: 7°C
May
17°
High: 23°C
Avg: 17°C
Low: 12°C
Jun
20°
High: 25°C
Avg: 20°C
Low: 15°C
Jul
19°
High: 24°C
Avg: 19°C
Low: 14°C
Aug
14°
High: 19°C
Avg: 14°C
Low: 9°C
Sep
8°
High: 12°C
Avg: 8°C
Low: 3°C
Oct
1°
High: 5°C
Avg: 1°C
Low: -2°C
Nov
-5°
High: -2°C
Avg: -5°C
Low: -9°C
Dec
0°C
−2°C
Avg High Avg Temp Avg Low Light Frost (0°C) Hard Frost (−2°C)

Precipitation

0 mm 50 mm 100 mm
84 mm
83.8 mm
Jan
71 mm
71.1 mm
Feb
76 mm
76.2 mm
Mar
89 mm
88.9 mm
Apr
107 mm
106.7 mm
May
114 mm
114.3 mm
Jun
124 mm
124.5 mm
Jul
124 mm
124.5 mm
Aug
114 mm
114.3 mm
Sep
114 mm
114.3 mm
Oct
76 mm
76.2 mm
Nov
84 mm
83.8 mm
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h11.5h13.5h14.5h15.5h15h14h12.5h10.5h9.5h8.5h
Jan: 7:33 AM – 4:27 PM · 8h 55m
Feb: 6:55 AM – 5:05 PM · 10h 10m
Mar: 6:11 AM – 5:49 PM · 11h 37m
Apr: 5:21 AM – 6:39 PM · 13h 17m
May: 4:40 AM – 7:20 PM · 14h 41m
Jun: 4:17 AM – 7:43 PM · 15h 26m
Jul: 4:26 AM – 7:34 PM · 15h 08m
Aug: 5:03 AM – 6:57 PM · 13h 55m
Sep: 5:51 AM – 6:09 PM · 12h 18m
Oct: 6:39 AM – 5:21 PM · 10h 41m
Nov: 7:22 AM – 4:38 PM · 9h 16m
Dec: 7:43 AM – 4:17 PM · 8h 33m
Daylight Longest: 15h 28m · Shortest: 8h 32m

Nearby Stations

Bonsecours, Canada May 20 - September 19 Lennoxville, Canada May 14 - October 1 Bromptonville, Canada May 23 - September 26 Coaticook, Canada May 14 - September 30 Newport, VTMay 14 - September 30 Brome, Canada May 23 - September 16

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