Frost Dates for Ontonagon, MI

Based on data from Ontonagon 6 Se weather station, 6 miles away

Elevation: 617 ft

Frost Dates

Last Spring Frost (50%) May 27

First Fall Frost (50%) October 1

30% Probability

Last Spring Frost June 2

First Fall Frost September 25

Hard Freeze (28°F)

Last Spring Hard Freeze May 10

First Fall Hard Freeze October 14

46.87°N, 89.31°W © OpenStreetMap

Growing Season

127 Days May 27 to October 1

USDA Hardiness Zone

Zone 5a

Avg. annual minimum: −20 to −15°F

Learn more

Köppen Climate

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

0° 20° 40° 60° 80°

17°

Jan

19°

Feb

29°

Mar

41°

Apr

54°

May

63°

Jun

67°

Jul

66°

Aug

60°

Sep

47°

Oct

34°

Nov

23°

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	25°	17°	9°
February	30°	19°	9°
March	40°	29°	18°
April	52°	41°	30°
May	66°	54°	41°
June	75°	63°	50°
July	79°	67°	55°
August	78°	66°	54°
September	71°	60°	48°
October	56°	47°	38°
November	41°	34°	27°
December	30°	23°	16°

Precipitation

0" 2" 4" 5.4"

3.6"

Jan

2.7"

Feb

3.4"

Mar

4.8"

Apr

5.4"

May

5.2"

Jun

4.8"

Jul

5.0"

Aug

5.1"

Sep

4.8"

Oct

3.9"

Nov

4.0"

Dec

Precipitation table

Average monthly precipitation (inches)
Month	Precipitation
January	3.6
February	2.7
March	3.4
April	4.8
May	5.4
June	5.2
July	4.8
August	5.0
September	5.1
October	4.8
November	3.9
December	4.0

Sunrise / Sunset

Jan: 8:44 AM – 5:28 PM · 8h 44m

Feb: 8:10 AM – 6:13 PM · 10h 03m

Mar: 8:19 AM – 7:54 PM · 11h 36m

Apr: 7:16 AM – 8:38 PM · 13h 21m

May: 6:28 AM – 9:18 PM · 14h 50m

Jun: 6:08 AM – 9:46 PM · 15h 39m

Jul: 6:23 AM – 9:42 PM · 15h 19m

Aug: 7:00 AM – 9:02 PM · 14h 01m

Sep: 7:42 AM – 8:01 PM · 12h 19m

Oct: 8:24 AM – 7:00 PM · 10h 37m

Nov: 8:09 AM – 5:15 PM · 9h 06m

Dec: 8:42 AM – 5:03 PM · 8h 21m

Daylight Eastern Time (ET) Longest: 15h 40m · Shortest: 8h 20m

Sunrise and sunset table

Sunrise, sunset, and daylight on the 15th of each month (Eastern Time (ET))
Month	Sunrise	Sunset	Daylight
January	8:44 AM	5:28 PM	8h 44m
February	8:10 AM	6:13 PM	10h 03m
March	8:19 AM	7:54 PM	11h 36m
April	7:16 AM	8:38 PM	13h 21m
May	6:28 AM	9:18 PM	14h 50m
June	6:08 AM	9:46 PM	15h 39m
July	6:23 AM	9:42 PM	15h 19m
August	7:00 AM	9:02 PM	14h 01m
September	7:42 AM	8:01 PM	12h 19m
October	8:24 AM	7:00 PM	10h 37m
November	8:09 AM	5:15 PM	9h 06m
December	8:42 AM	5:03 PM	8h 21m

Nearby Stations

Greenland 6n, MI May 23 - October 1 Bergland Dam, MI May 26 - September 27 Baraga 7nw, MI May 25 - September 23 Paulding, MIMay 31 - September 19 Watton 2wsw, MI May 25 - September 25 Alberta Ford For Ctr, MI May 23 - October 1

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