Climate and monthly weather forecastHartly, DE
Climate and monthly weather forecast
Weather in January
January, like December, in Hartly, Delaware, is an icy winter month, with an average temperature fluctuating between 27.9°F (-2.3°C) and 39.2°F (4°C). In Hartly, January is the coldest month, with temperatures averaging a high of 39.2°F (4°C) and a low of 27.9°F (-2.3°C). Weather in January »Weather in February
February, the last month of the winter in Hartly, is a frosty month, with an average temperature ranging between min 29.8°F (-1.2°C) and max 43°F (6.1°C). A minimal variation is noted in Hartly's average high-temperature at the onset of February, reaching a frosty 43°F (6.1°C) from January's 39.2°F (4°C). Weather in February »Weather in March
March, the first month of the spring in Hartly, is a cool month, with an average temperature varying between 36.7°F (2.6°C) and 50.2°F (10.1°C). With the onset of March, Hartly's weather sees a minor temperature rise, transitioning from a frosty 43°F (6.1°C) in February to a cool 50.2°F (10.1°C). Weather in March »Weather in April
April in Hartly, Delaware, is an enjoyable spring month, with an average temperature fluctuating between 46.4°F (8°C) and 62.2°F (16.8°C). Hartly sees an increase in the average high-temperature with the arrival of April, moving from March's cool 50.2°F (10.1°C) to a comfortable 62.2°F (16.8°C). Weather in April »Weather in May
The last month of the spring, May, is an agreeable month in Hartly, Delaware, with temperature in the range of an average high of 71.2°F (21.8°C) and an average low of 55.9°F (13.3°C). With the onset of May, Hartly's average high-temperature sees a rise, moving from April's enjoyable 62.2°F (16.8°C) to an agreeable 71.2°F (21.8°C). Weather in May »Weather in June
The first month of the summer, June, is a moderately hot month in Hartly, Delaware, with an average temperature fluctuating between 79.3°F (26.3°C) and 64°F (17.8°C). June marks a minor ascent in the average high-temperature, adjusting from May's pleasant 71.2°F (21.8°C) to a moderately hot 79.3°F (26.3°C). Weather in June »Weather in July
July, the same as June, is a moderately hot summer month in Hartly, Delaware, with an average temperature ranging between max 84.4°F (29.1°C) and min 69.3°F (20.7°C). Hartly's July weather, marked by an average high temperature of 84.4°F (29.1°C) and an average low temperature of 69.3°F (20.7°C), is the warmest in the year. In July, the average heat index is evaluated at a hot 93.2°F (34°C). Weather in July »Weather in August
August, the last month of the summer in Hartly, is also a moderately hot month, with an average temperature varying between 82.4°F (28°C) and 67.6°F (19.8°C). Hartly's shift from July to August is accompanied by an average high-temperature of a still moderately hot 82.4°F (28°C), a slight deviation from 84.4°F (29.1°C). Weather in August »Weather in September
September, the first month of the autumn in Hartly, is also a moderately hot month, with an average temperature fluctuating between 76.6°F (24.8°C) and 61.9°F (16.6°C). September implies a soft temperature shift, with average high-temperatures reducing from August's 82.4°F (28°C) to a still warm 76.6°F (24.8°C). Weather in September »Weather in October
October, like September, in Hartly, Delaware, is another enjoyable autumn month, with temperature in the range of an average low of 52.7°F (11.5°C) and an average high of 65.5°F (18.6°C). The average high-temperature drops in October, from September's moderately hot 76.6°F (24.8°C) to a refreshing 65.5°F (18.6°C). Weather in October »Weather in November
November, the last month of the autumn in Hartly, is another cool month, with an average temperature ranging between min 41.2°F (5.1°C) and max 54°F (12.2°C). Transition from October to November is accompanied by a temperature drop, with average high-temperatures decreasing from a refreshing 65.5°F (18.6°C) to a fresh 54°F (12.2°C). Weather in November »Weather in December
December, the first month of the winter in Hartly, is still a chilly month, with an average temperature fluctuating between 34.7°F (1.5°C) and 45.9°F (7.7°C). December sees a slight reduction in average high-temperature, with a shift from a cool 54°F (12.2°C) in November to a chilly 45.9°F (7.7°C). Weather in December »Updated: Aug 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
With its average high temperature of 39.2°F (4°C) and a low of 27.9°F (-2.3°C), January is regarded as the coldest month.
January is the month with the least rainfall. Rain falls for 9.7 days and accumulates 2.13" (54mm) of precipitation.
Throughout the year, in Hartly, there are 169.2 rainfall days, and 34.96" (888mm) of precipitation is accumulated.
January through April, November and December are months with snowfall.
Throughout the year, there are 14.4 snowfall days, and 7.44" (189mm) of snow is accumulated.
The months with the lowest UV index are January and December, with an average maximum UV index of 2.
The month with the least sunshine is February, with an average of 5.1h of sunshine.
March is the month with the most snowfall. Snow falls for 2.8 days and accumulates 2.6" (66mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
The least humid month is April, with an average relative humidity of 73%.
The most humid month is May, with an average relative humidity of 79%.
In Hartly, snow does not fall in May through October.
The months with the highest UV index are May through August, with an average maximum UV index of 6.
June has the longest days of the year, with an average of 14h and 54min of daylight.
July is the month when Hartly's temperatures reach their peak, with averages of 84.4°F (29.1°C) and lows of 69.3°F (20.7°C).
With an average of 10.7h of sunshine, July has the most sunshine of the year.
The month with the most rainfall is August, when the rain falls for 16.4 days and typically aggregates up to 3.86" (98mm) of precipitation.
With an average of 9h and 30min of daylight, December has the shortest days of the year.
Average temperature
Hartly, DE
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (39.2°F).
The month with the highest average low temperature is July (69.3°F).
The coldest month (with the lowest average low temperature) is January (27.9°F).
Average pressure
Hartly, DE
- Average pressure in January:
30.09"Hg - Average pressure in February:
30.06"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
29.99"Hg - Average pressure in May:
30.02"Hg - Average pressure in June:
29.94"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.05"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.12"Hg - Average pressure in December:
30.1"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed
Hartly, DE
- Average wind speed in January:
9.4mph - Average wind speed in February:
9.5mph - Average wind speed in March:
9.5mph - Average wind speed in April:
9.4mph - Average wind speed in May:
7.6mph - Average wind speed in June:
7.1mph
- Average wind speed in July:
6.1mph - Average wind speed in August:
6mph - Average wind speed in September:
6.7mph - Average wind speed in October:
8.1mph - Average wind speed in November:
8.5mph - Average wind speed in December:
8.7mph
The windiest months (with the highest average wind speed) are February and March (9.5mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity
Hartly, DE
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is April (73%).
Average rainfall
Hartly, DE
- Average rainfall in January:
2.13" - Average rainfall in February:
2.64" - Average rainfall in March:
2.91" - Average rainfall in April:
2.64" - Average rainfall in May:
3.07" - Average rainfall in June:
3.19"
- Average rainfall in July:
3.62" - Average rainfall in August:
3.86" - Average rainfall in September:
2.32" - Average rainfall in October:
2.87" - Average rainfall in November:
2.28" - Average rainfall in December:
3.43"
The wettest month (with the highest rainfall) is August (3.86").
The driest month (with the least rainfall) is January (2.13").
Average rainfall days
Hartly, DE
- Average rainfall days in January:
9.7 days - Average rainfall days in February:
10.3 days - Average rainfall days in March:
15.1 days - Average rainfall days in April:
15.3 days - Average rainfall days in May:
18.3 days - Average rainfall days in June:
17.4 days
- Average rainfall days in July:
19 days - Average rainfall days in August:
16.4 days - Average rainfall days in September:
14.3 days - Average rainfall days in October:
12.6 days - Average rainfall days in November:
9.3 days - Average rainfall days in December:
11.5 days
The month with the highest number of rainy days is July (19 days).
The month with the least rainy days is November (9.3 days).
Average snowfall
Hartly, DE
The month with the highest snowfall is March (2.6").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Hartly, DE
- Average snowfall days in January:
4.5 days - Average snowfall days in February:
4.1 days - Average snowfall days in March:
2.8 days - Average snowfall days in April:
0.2 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.3 days - Average snowfall days in December:
2.5 days
The month with the highest number of snowfall days is January (4.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Hartly, DE
- Average daylight in January:
9h and 48min - Average daylight in February:
10h and 48min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 18min - Average daylight in June:
14h and 54min
- Average daylight in July:
14h and 36min - Average daylight in August:
13h and 42min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 12min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 30min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in January:
5h and 18min - Average sunshine in February:
5h and 6min - Average sunshine in March:
6h and 42min - Average sunshine in April:
8h and 48min - Average sunshine in May:
8h and 54min - Average sunshine in June:
10h and 18min
- Average sunshine in July:
10h and 42min - Average sunshine in August:
10h and 30min - Average sunshine in September:
9h and 24min - Average sunshine in October:
5h and 42min - Average sunshine in November:
5h and 54min - Average sunshine in December:
5h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).
Average sunshine days
Hartly, DE
- Average sunshine days in January:
17.2 days - Average sunshine days in February:
13.6 days - Average sunshine days in March:
13.4 days - Average sunshine days in April:
12.6 days - Average sunshine days in May:
10.3 days - Average sunshine days in June:
10.6 days
- Average sunshine days in July:
9.5 days - Average sunshine days in August:
11.3 days - Average sunshine days in September:
13.4 days - Average sunshine days in October:
16.3 days - Average sunshine days in November:
19.5 days - Average sunshine days in December:
16.8 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (9.5 days).
Average UV index
Hartly, DE
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover
Hartly, DE
The months with the most cloud cover are February and March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 29).
Average visibility
Hartly, DE
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
