Frost Dates for Charlestown, MD

Based on data from Conowingo Dam weather station, 12 miles away

Elevation: 36 ft

Frost Dates

Last Spring Frost (50%) April 3

First Fall Frost (50%) November 6

30% Probability

Last Spring Frost April 9

First Fall Frost November 1

Hard Freeze (28°F)

Last Spring Hard Freeze March 24

First Fall Hard Freeze November 17

39.57°N, 75.97°W © OpenStreetMap

Growing Season

217 Days April 3 to November 6

USDA Hardiness Zone

Zone 7b

Avg. annual minimum: 5 to 10°F

Learn more

Köppen Climate

Cfa Humid Subtropical

Hot, humid summers and mild winters with rain year-round. Long growing seasons support a wide variety of vegetables, fruits, and ornamentals. The most common climate in the eastern US.

Köppen climate map

Temperature

20° 40° 60° 80°

33°

Jan

35°

Feb

42°

Mar

54°

Apr

64°

May

73°

Jun

78°

Jul

76°

Aug

69°

Sep

57°

Oct

46°

Nov

38°

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	40°	33°	25°
February	43°	35°	26°
March	51°	42°	34°
April	64°	54°	44°
May	74°	64°	54°
June	83°	73°	64°
July	88°	78°	69°
August	85°	76°	67°
September	79°	69°	60°
October	67°	57°	48°
November	55°	46°	37°
December	45°	38°	31°

Precipitation

0" 3" 6" 8.7"

5.3"

Jan

5.5"

Feb

6.3"

Mar

5.8"

Apr

7.2"

May

7.3"

Jun

8.7"

Jul

7.9"

Aug

8.4"

Sep

8.0"

Oct

6.7"

Nov

6.9"

Dec

Precipitation table

Average monthly precipitation (inches)
Month	Precipitation
January	5.3
February	5.5
March	6.3
April	5.8
May	7.2
June	7.3
July	8.7
August	7.9
September	8.4
October	8.0
November	6.7
December	6.9

Sunrise / Sunset

Jan: 7:29 AM – 4:59 PM · 9h 29m

Feb: 7:04 AM – 5:34 PM · 10h 30m

Mar: 7:24 AM – 7:05 PM · 11h 41m

Apr: 6:33 AM – 7:37 PM · 13h 03m

May: 5:55 AM – 8:06 PM · 14h 11m

Jun: 5:41 AM – 8:29 PM · 14h 47m

Jul: 5:54 AM – 8:27 PM · 14h 33m

Aug: 6:22 AM – 7:56 PM · 13h 34m

Sep: 6:52 AM – 7:07 PM · 12h 15m

Oct: 7:22 AM – 6:18 PM · 10h 56m

Nov: 6:57 AM – 4:43 PM · 9h 46m

Dec: 7:24 AM – 4:37 PM · 9h 12m

Daylight Eastern Time (ET) Longest: 14h 49m · Shortest: 9h 11m

Sunrise and sunset table

Sunrise, sunset, and daylight on the 15th of each month (Eastern Time (ET))
Month	Sunrise	Sunset	Daylight
January	7:29 AM	4:59 PM	9h 29m
February	7:04 AM	5:34 PM	10h 30m
March	7:24 AM	7:05 PM	11h 41m
April	6:33 AM	7:37 PM	13h 03m
May	5:55 AM	8:06 PM	14h 11m
June	5:41 AM	8:29 PM	14h 47m
July	5:54 AM	8:27 PM	14h 33m
August	6:22 AM	7:56 PM	13h 34m
September	6:52 AM	7:07 PM	12h 15m
October	7:22 AM	6:18 PM	10h 56m
November	6:57 AM	4:43 PM	9h 46m
December	7:24 AM	4:37 PM	9h 12m

Nearby Stations

Octoraro Lake, PA April 26 - October 22 Aberdeen Phillips Fld, MD April 10 - October 30 Safe Harbor Dam, PA April 1 - November 10 Newark Ag Farm, DE April 7 - November 2 Avondale 2 N, PA April 19 - October 26 Lancaster 2ne Fltr Plt, PA April 19 - October 24

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