Frost Dates for Main Bay, AK

Elevation: 17 m

Frost Dates

Last Spring Frost (50%) May 19

First Fall Frost (50%) October 6

30% Probability

Last Spring Frost May 26

First Fall Frost October 1

Hard Freeze (28°F)

Last Spring Hard Freeze April 28

First Fall Hard Freeze October 20

60.52°N, 148.09°W © OpenStreetMap

Growing Season

140 Days May 19 to October 6

USDA Hardiness Zone

Zone 6b

Avg. annual minimum: −5 to 0°F

Learn more

Köppen Climate

Dfc Subarctic

Short, cool summers and long, very cold winters. Growing seasons of 3–4 months require fast-maturing varieties. Root vegetables, potatoes, and cold-hardy greens are the most reliable.

Köppen climate map

Temperature

20° 40° 60°

26°

Jan

27°

Feb

30°

Mar

37°

Apr

43°

May

51°

Jun

56°

Jul

55°

Aug

49°

Sep

40°

Oct

31°

Nov

28°

Dec

32°F

28°F

Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Temperature table

Average monthly temperatures (°F)
Month	Avg High	Avg Temp	Avg Low
January	31°	26°	21°
February	33°	27°	22°
March	37°	30°	22°
April	44°	37°	30°
May	52°	43°	35°
June	59°	51°	43°
July	62°	56°	50°
August	61°	55°	49°
September	55°	49°	43°
October	45°	40°	34°
November	36°	31°	26°
December	33°	28°	24°

Precipitation

0" 6" 12" 18" 22.0"

20.1"

Jan

16.9"

Feb

16.6"

Mar

14.8"

Apr

11.7"

May

7.7"

Jun

9.3"

Jul

14.6"

Aug

19.5"

Sep

22.0"

Oct

21.7"

Nov

22.0"

Dec

Precipitation table

Average monthly precipitation (inches)
Month	Precipitation
January	20.1
February	16.9
March	16.6
April	14.8
May	11.7
June	7.7
July	9.3
August	14.6
September	19.5
October	22.0
November	21.7
December	22.0

Sunrise / Sunset

Jan: 8:54 AM – 3:06 PM · 6h 12m

Feb: 7:39 AM – 4:21 PM · 8h 42m

Mar: 6:20 AM – 5:40 PM · 11h 20m

Apr: 4:52 AM – 7:08 PM · 14h 16m

May: 3:32 AM – 8:28 PM · 16h 56m

Jun: 2:41 AM – 9:19 PM · 18h 37m

Jul: 3:03 AM – 8:57 PM · 17h 54m

Aug: 4:17 AM – 7:43 PM · 15h 26m

Sep: 5:44 AM – 6:16 PM · 12h 31m

Oct: 7:10 AM – 4:50 PM · 9h 41m

Nov: 8:32 AM – 3:28 PM · 6h 57m

Dec: 9:19 AM – 2:41 PM · 5h 22m

Daylight Longest: 18h 41m · Shortest: 5h 19m

Sunrise and sunset table

Sunrise, sunset, and daylight on the 15th of each month (local solar time)
Month	Sunrise	Sunset	Daylight
January	8:54 AM	3:06 PM	6h 12m
February	7:39 AM	4:21 PM	8h 42m
March	6:20 AM	5:40 PM	11h 20m
April	4:52 AM	7:08 PM	14h 16m
May	3:32 AM	8:28 PM	16h 56m
June	2:41 AM	9:19 PM	18h 37m
July	3:03 AM	8:57 PM	17h 54m
August	4:17 AM	7:43 PM	15h 26m
September	5:44 AM	6:16 PM	12h 31m
October	7:10 AM	4:50 PM	9h 41m
November	8:32 AM	3:28 PM	6h 57m
December	9:19 AM	2:41 PM	5h 22m

Nearby Stations

Wally Noerenberg Hatchery, AK May 20 - October 9 Whittier, AKApril 25 - October 14 Portage Glacier V C, AK May 27 - September 12 Port San Juan, AK May 10 - October 7 Cannery Creek, AK May 16 - October 3 Seward 19n, AK May 21 - September 26

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