Frost Dates for Butte Bert Mooney AP, MT

Elevation: 1678 m

Frost Dates

Last Spring Frost (50%) June 13

First Fall Frost (50%) September 5

30% Probability

Last Spring Frost June 21

First Fall Frost August 31

Hard Freeze (28°F)

Last Spring Hard Freeze May 21

First Fall Hard Freeze September 17

45.96°N, 112.50°W © OpenStreetMap

Growing Season

84 Days June 13 to September 5

USDA Hardiness Zone

Zone 4a

Avg. annual minimum: −30 to −25°F

Learn more

Köppen Climate

BSk Cold Semi-Arid (Steppe)

Cool to cold with low rainfall and wide temperature swings. Common in the western Great Plains and central Asia. Short growing seasons benefit from season extension techniques.

Köppen climate map

Temperature

0° 30° 60° 90°

20°

Jan

22°

Feb

32°

Mar

39°

Apr

48°

May

56°

Jun

64°

Jul

62°

Aug

53°

Sep

41°

Oct

28°

Nov

19°

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	32°	20°	8°
February	35°	22°	10°
March	44°	32°	19°
April	51°	39°	26°
May	61°	48°	34°
June	70°	56°	41°
July	81°	64°	46°
August	80°	62°	44°
September	69°	53°	37°
October	54°	41°	27°
November	40°	28°	16°
December	31°	19°	7°

Precipitation

0" 1" 2" 2.8"

0.9"

Jan

1.0"

Feb

1.4"

Mar

1.9"

Apr

2.8"

May

2.7"

Jun

2.2"

Jul

2.5"

Aug

2.3"

Sep

1.7"

Oct

1.2"

Nov

0.9"

Dec

Precipitation table

Average monthly precipitation (inches)
Month	Precipitation
January	0.9
February	1.0
March	1.4
April	1.9
May	2.8
June	2.7
July	2.2
August	2.5
September	2.3
October	1.7
November	1.2
December	0.9

Sunrise / Sunset

Jan: 8:14 AM – 5:04 PM · 8h 50m

Feb: 7:41 AM – 5:48 PM · 10h 07m

Mar: 7:51 AM – 7:28 PM · 11h 37m

Apr: 6:51 AM – 8:10 PM · 13h 19m

May: 6:04 AM – 8:49 PM · 14h 45m

Jun: 5:44 AM – 9:16 PM · 15h 32m

Jul: 5:59 AM – 9:12 PM · 15h 13m

Aug: 6:35 AM – 8:33 PM · 13h 58m

Sep: 7:15 AM – 7:34 PM · 12h 18m

Oct: 7:55 AM – 6:35 PM · 10h 39m

Nov: 7:39 AM – 4:51 PM · 9h 12m

Dec: 8:12 AM – 4:40 PM · 8h 28m

Daylight Mountain Time (MT) Longest: 15h 33m · Shortest: 8h 27m

Sunrise and sunset table

Sunrise, sunset, and daylight on the 15th of each month (Mountain Time (MT))
Month	Sunrise	Sunset	Daylight
January	8:14 AM	5:04 PM	8h 50m
February	7:41 AM	5:48 PM	10h 07m
March	7:51 AM	7:28 PM	11h 37m
April	6:51 AM	8:10 PM	13h 19m
May	6:04 AM	8:49 PM	14h 45m
June	5:44 AM	9:16 PM	15h 32m
July	5:59 AM	9:12 PM	15h 13m
August	6:35 AM	8:33 PM	13h 58m
September	7:15 AM	7:34 PM	12h 18m
October	7:55 AM	6:35 PM	10h 39m
November	7:39 AM	4:51 PM	9h 12m
December	8:12 AM	4:40 PM	8h 28m

Nearby Stations

Divide, MTJune 10 - September 7 Anaconda, MTJune 1 - September 14 Boulder, MTJune 7 - September 8 Wise Rvr 3 Wnw, MT Twin Bridges, MT June 8 - September 2 Glen 4 N, MT

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