Frost Dates for Plainfield, IL

Based on data from Romeoville Wfo weather station, 6 miles away

Elevation: 617 ft

Frost Dates

Last Spring Frost (50%) April 20

First Fall Frost (50%) October 22

30% Probability

Last Spring Frost April 27

First Fall Frost October 17

Hard Freeze (28°F)

Last Spring Hard Freeze April 8

First Fall Hard Freeze November 1

41.63°N, 88.20°W © OpenStreetMap

Growing Season

185 Days April 20 to October 22

USDA Hardiness Zone

Zone 5b

Avg. annual minimum: −15 to −10°F

Learn more

Köppen Climate

Dfa Hot-Summer Continental

Hot summers and cold winters with year-round precipitation. Moderate growing season supports warm-season crops like tomatoes, peppers, and corn. Winter protection extends the harvest.

Köppen climate map

Temperature

10° 30° 50° 70° 90°

24°

Jan

28°

Feb

39°

Mar

50°

Apr

61°

May

71°

Jun

75°

Jul

73°

Aug

66°

Sep

54°

Oct

40°

Nov

29°

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°	24°	16°
February	36°	28°	20°
March	49°	39°	30°
April	61°	50°	40°
May	72°	61°	50°
June	82°	71°	60°
July	85°	75°	65°
August	83°	73°	63°
September	76°	66°	55°
October	64°	54°	44°
November	49°	40°	32°
December	37°	29°	22°

Precipitation

0" 3" 6" 8.0"

3.1"

Jan

2.5"

Feb

3.5"

Mar

5.0"

Apr

6.5"

May

6.6"

Jun

7.2"

Jul

8.0"

Aug

6.1"

Sep

4.6"

Oct

3.4"

Nov

3.2"

Dec

Precipitation table

Average monthly precipitation (inches)
Month	Precipitation
January	3.1
February	2.5
March	3.5
April	5.0
May	6.5
June	6.6
July	7.2
August	8.0
September	6.1
October	4.6
November	3.4
December	3.2

Sunrise / Sunset

Jan: 7:23 AM – 4:41 PM · 9h 18m

Feb: 6:55 AM – 5:18 PM · 10h 23m

Mar: 7:12 AM – 6:52 PM · 11h 40m

Apr: 6:19 AM – 7:26 PM · 13h 08m

May: 5:38 AM – 7:59 PM · 14h 21m

Jun: 5:23 AM – 8:23 PM · 15h 00m

Jul: 5:36 AM – 8:20 PM · 14h 44m

Aug: 6:06 AM – 7:47 PM · 13h 41m

Sep: 6:39 AM – 6:55 PM · 12h 16m

Oct: 7:12 AM – 6:03 PM · 10h 51m

Nov: 6:49 AM – 4:26 PM · 9h 36m

Dec: 7:18 AM – 4:18 PM · 8h 60m

Daylight Central Time (CT) Longest: 15h 01m · Shortest: 8h 59m

Sunrise and sunset table

Sunrise, sunset, and daylight on the 15th of each month (Central Time (CT))
Month	Sunrise	Sunset	Daylight
January	7:23 AM	4:41 PM	9h 18m
February	6:55 AM	5:18 PM	10h 23m
March	7:12 AM	6:52 PM	11h 40m
April	6:19 AM	7:26 PM	13h 08m
May	5:38 AM	7:59 PM	14h 21m
June	5:23 AM	8:23 PM	15h 00m
July	5:36 AM	8:20 PM	14h 44m
August	6:06 AM	7:47 PM	13h 41m
September	6:39 AM	6:55 PM	12h 16m
October	7:12 AM	6:03 PM	10h 51m
November	6:49 AM	4:26 PM	9h 36m
December	7:18 AM	4:18 PM	8h 60m

Nearby Stations

Joliet Brandon Rd Dam, IL April 19 - October 25 Little Red School Hse, IL April 19 - October 22 Wheaton 3 Se, IL April 27 - October 17 Lisle-Morton Arboretum, IL April 28 - October 16 Aurora, ILApril 19 - October 23 Channahon Dresden Isl Dam, IL April 16 - October 26

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