Frost Dates for Sleepy Hollow, WY

Based on data from Gillette 4se weather station, 3 miles away

Elevation: 4560 ft

Frost Dates

Last Spring Frost (50%) May 15

First Fall Frost (50%) October 1

30% Probability

Last Spring Frost May 21

First Fall Frost September 25

Hard Freeze (28°F)

Last Spring Hard Freeze May 2

First Fall Hard Freeze October 10

44.23°N, 105.43°W © OpenStreetMap

Growing Season

139 Days May 15 to October 1

USDA Hardiness Zone

Zone 5a

Avg. annual minimum: −20 to −15°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

10° 30° 50° 70° 90°

26°

Jan

27°

Feb

37°

Mar

44°

Apr

53°

May

64°

Jun

72°

Jul

71°

Aug

61°

Sep

47°

Oct

35°

Nov

26°

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	36°	26°	16°
February	38°	27°	17°
March	49°	37°	25°
April	56°	44°	32°
May	66°	53°	41°
June	77°	64°	50°
July	86°	72°	57°
August	85°	71°	56°
September	75°	61°	46°
October	59°	47°	34°
November	46°	35°	24°
December	36°	26°	16°

Precipitation

0" 1" 2" 3" 3.7"

1.6"

Jan

1.5"

Feb

2.2"

Mar

2.7"

Apr

3.7"

May

3.5"

Jun

3.1"

Jul

3.0"

Aug

2.9"

Sep

2.6"

Oct

1.6"

Nov

1.9"

Dec

Precipitation table

Average monthly precipitation (inches)
Month	Precipitation
January	1.6
February	1.5
March	2.2
April	2.7
May	3.7
June	3.5
July	3.1
August	3.0
September	2.9
October	2.6
November	1.6
December	1.9

Sunrise / Sunset

Jan: 7:40 AM – 4:42 PM · 9h 02m

Feb: 7:10 AM – 5:23 PM · 10h 14m

Mar: 7:22 AM – 7:00 PM · 11h 38m

Apr: 6:25 AM – 7:39 PM · 13h 14m

May: 5:41 AM – 8:16 PM · 14h 35m

Jun: 5:23 AM – 8:41 PM · 15h 19m

Jul: 5:37 AM – 8:38 PM · 15h 01m

Aug: 6:11 AM – 8:01 PM · 13h 51m

Sep: 6:48 AM – 7:05 PM · 12h 17m

Oct: 7:25 AM – 6:09 PM · 10h 44m

Nov: 7:06 AM – 4:28 PM · 9h 22m

Dec: 7:37 AM – 4:18 PM · 8h 41m

Daylight Mountain Time (MT) Longest: 15h 20m · Shortest: 8h 40m

Sunrise and sunset table

Sunrise, sunset, and daylight on the 15th of each month (Mountain Time (MT))
Month	Sunrise	Sunset	Daylight
January	7:40 AM	4:42 PM	9h 02m
February	7:10 AM	5:23 PM	10h 14m
March	7:22 AM	7:00 PM	11h 38m
April	6:25 AM	7:39 PM	13h 14m
May	5:41 AM	8:16 PM	14h 35m
June	5:23 AM	8:41 PM	15h 19m
July	5:37 AM	8:38 PM	15h 01m
August	6:11 AM	8:01 PM	13h 51m
September	6:48 AM	7:05 PM	12h 17m
October	7:25 AM	6:09 PM	10h 44m
November	7:06 AM	4:28 PM	9h 22m
December	7:37 AM	4:18 PM	8h 41m

Nearby Stations

Gillette Campbell AP, WY May 22 - September 25 Dillinger, WY May 25 - September 17 Moorcroft 3s, WY May 22 - September 28 Echeta 2 Nw, WY May 21 - September 23 Weston 1 E, WY May 23 - September 18 Wright 12w, WY May 25 - September 23

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