Climate and monthly weather forecastWilmington, DE
Climate and monthly weather forecast
The climate of Wilmington
Predominantly typified by a Humid subtropical climate, Wilmington, Delaware, USA finds itself under the Köppen climate classification of Cfa. Its geographical position sees it experiencing a blend of temperate and subtropical features. Following formal climate definition, Wilmington resides in a zone with no dry season while hot and wet summers and mild winters are predominant.Immersing deeper into Wilmington's climate provides a clearer understanding of its weather. Temperature range begins from a plot of 25.3°F (-3.7°C) in January, escalating to a high of 84.9°F (29.4°C) in July. Relative humidity tends to stay quite constant, varying slightly from 72% in April to 78% in October. Generally, the relative humidity ranges within the 70s band, depicting a moisture-rich atmosphere.
Rainfall seems to be a regular facet of Wilmington's climate. Figures show that August tops the rainfall chart with 4.09" (104mm) while January receives the least amount at 2.36" (60mm). Intriguingly, there is notable snowfall between January and March then again mildly in November and December, with January receiving the highest snow accumulation of 3.03" (77mm).
The best time to visit Wilmington
With consideration to favorable weather conditions, visiting Wilmington between the months of May and June seems ideal. This period witnesses average temperatures oscillating from 61.3°F (16.3°C) to 79.5°F (26.4°C), offering a pleasant and satisfying weather condition for outdoor exploration and activities.Wilmington's daylight hours in these months are relatively high, falling between 14.4 hours in May and a peak of 15 hours in June, thus promising longer days for exploration. The weather during these months does come with an elevated UV Index of 6, necessitating visitors to ensure adequate skin protection.
The worst time to visit Wilmington
From the available data, the least favourable period to visit Wilmington occurs between January and February. In these winter months, average temperatures range from a low of 25.3°F (-3.7°C) to a maximum of only 40.8°F (4.9°C). Besides, the hours of daylight drop significantly to around 9.7 to 10.7 hours for outright engagement in outdoor activities. Snowfall is also prevalent during this period, especially in January with snow recorded to reach up to 3.03" (77mm).Spring weather in Wilmington
Spring, from March to May, in Wilmington bears notable improvements in weather conditions. Temperatures start to rise, with averages moving from 49.3°F (9.6°C) in March to 71.6°F (22°C) by May. Rainfall average increases at a steady rate peaking at 3.19" (81mm) in May. The city also enjoys an increase in daily sunlight hours, stretching from 12 hours in March to 14.4 hours in May.Summer weather in Wilmington
Summer in Wilmington, spanning from June to August, is characterized by high temperatures, increased rainfall and plentiful sunlight. Average temperatures peak at 84.9°F (29.4°C) in July but drop slightly to 82.9°F (28.3°C) in August. Monthly rainfall also spikes to its highest at 4.09" (104mm) in August. However, sunshine isn't lost, with daylight hours reaching their zenith of 15 hours in June.Autumn weather in Wilmington
Autumn, from September to November, brings a decline in temperature averages from 76.3°F (24.6°C) in September to 52.2°F (11.2°C) in November. Conversely, humidity rises, reaching its peak in October with a reading of 78%. Rainfall reduces gradually from its summer level, with November recording the lowest autumn rainfall of 2.44" (62mm).Winter weather in Wilmington
Winter months of December, January and February in Wilmington come with substantial chills and snowfall. December initiates the winter season with an average temperature of 43.7°F (6.5°C) that dips further to 37°F (2.8°C) in January. Concurrently, snowfall predominates, reaching its peak in January with 3.03" (77mm). The daylight hours also diminish, plateauing at approximately 9.7 hours in December and January.Weather in January
Commencing the year, January weather in Wilmington, Delaware, USA displays a set of standard winter conditions. Characterised by cold temperatures, it brings a notable amount of snowfall with 3.03" (77mm) spread over 6.8 days. In succession to the frosty extremes of the first month, February maintains the winter attributes. Weather in January »Weather in February
The second month of the year in Wilmington possesses colder temperatures, lighter snowfall, and increased rainfall as compared to January. One interesting aspect is the considerable rise in daylight hours, indicating the advent of the spring season. Weather in February »Weather in March
As Wilmington makes the transition from winter to spring, March introduces more mild weather with warming temperatures. March is unique because it receives 2.95" (75mm) of rainfall, the first notable increase after the decline in February. Weather in March »Weather in April
April in Wilmington, Delaware, brings forth the radiant buds of spring with noticeable changes from the past month's weather. With rains contributing 2.87" (73mm), it's a season of growth accompanied by a surge in humidity and relative pressure. Weather in April »Weather in May
The climactic layout for May in Wilmington constitutes a mixture of relatively high temperatures, substantial daylight and increased rainfall. With 71.6°F (22°C) as the high temperature, it is the doorway through which the heat of summer steps in. Weather in May »Weather in June
June ushers in summer in Wilmington with its characteristic lengthy days, elevated temperatures and intensified sunlight. The peak summer month, it presents Wilmington with a high temperature of 79.5°F (26.4°C). A substantial rise in sea temperature contributes to the overall coziness of the month, inviting beachgoers. Weather in June »Weather in July
In Wilmington, the zenith of summer arrives with July, characterized by the year's highest temperatures, prolonged sunshine, and minimal cloud cover. The zenith temperature hits 84.9°F (29.4°C), a feature quintessentially July, generating the hottest month of the year. Weather in July »Weather in August
August in Wilmington presents a continuation of the summer heat with slightly lower temperatures than the preceding month, and considerable daylight. The most rainfall seen this year showers down in August, with 4.09" (104mm) collected. Weather in August »Weather in September
September in Wilmington signifies an onset of fall with declining temperatures, yet preserving the warmth of the passing summer. September paves the way for decreased rainfall compared with the wet August, registering only 2.4" (61mm). Weather in September »Weather in October
October‘s weather in Wilmington Delaware exhibits a perceptible shift from September's with temperatures plunging to more chilly levels, shorter days, and a notable rise in wind speed. The impending winter season starts to make its presence felt with the first snowfall experienced since early spring, albeit a minor 0.04" (1mm). Weather in October »Weather in November
November, the last month of the autumn in Wilmington, is cool month, with temperature in the range of an average low of 38.8°F (3.8°C) and an average high of 52.2°F (11.2°C). As October shifts into November, a slight alteration in temperatures is observed, with average highs reducing from a comfortable 64.6°F (18.1°C) to a fresh 52.2°F (11.2°C). Weather in November »Weather in December
Completing the climatic cycle of the year, December in Wilmington is characterized by cold temperatures, decreased daylight hours and significantly increased snowfall. December is the first month since March to witness a conspicuous amount of snow, registering 1.54" (39mm). Weather in December »Updated: Feb 10, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Wilmington, Delaware, experiences its lowest temperatures in January, with an average peak of 37°F (2.8°C) and a low of 25.3°F (-3.7°C).
The month with the least rainfall is January, when the rain falls for 9.3 days and typically collects 2.36" (60mm) of precipitation.
Throughout the year, in Wilmington, there are 168.9 rainfall days, and 35.55" (903mm) of precipitation is accumulated.
January through May, October through December are months with snowfall.
Throughout the year, there are 21.9 snowfall days, and 12.05" (306mm) of snow is accumulated.
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
With an average ocean temperature of 33.8°F (1°C), February is the month with the coldest seawater.
February has the least sunshine of the year, with an average of 4.9h of sunshine.
March is the month with the most snowfall in Wilmington, Delaware. Snow falls for 4.7 days and accumulates 3.58" (91mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Wilmington, Delaware, 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.
April is the least humid month in Wilmington, Delaware, with an average relative humidity of 72%.
The months with the highest UV index in Wilmington are May through August, with an average maximum UV index of 6.
In Wilmington, snow does not fall in June through September.
With an average of 14h and 54min of daylight, June has the longest days of the year.
July, characterized by an average high temperature of 84.9°F (29.4°C) and a low temperature of 68.4°F (20.2°C), is generally the warmest month in Wilmington, Delaware.
The month with the most sunshine is July, with an average of 10.6h of sunshine.
August is the month with the most rainfall in Wilmington, Delaware. Rain falls for 17.3 days and accumulates 4.09" (104mm) of precipitation.
August is the month with the warmest seawater in Wilmington, with an average ocean temperature of 73.4°F (23°C).
With an average relative humidity of 78%, October is the most humid month.
The month with the shortest days is December, with an average of 9h and 24min of daylight.
Average temperature
Wilmington, DE
The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (37°F).
The month with the highest average low temperature is July (68.4°F).
The coldest month (with the lowest average low temperature) is January (25.3°F).
Average pressure
Wilmington, 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:
30.01"Hg - Average pressure in June:
29.94"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.99"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
Wilmington, DE
- Average wind speed in January:
8.6mph - Average wind speed in February:
8.6mph - Average wind speed in March:
8.6mph - Average wind speed in April:
8.5mph - Average wind speed in May:
6.8mph - Average wind speed in June:
6.3mph
- Average wind speed in July:
5.5mph - Average wind speed in August:
5.4mph - Average wind speed in September:
5.8mph - Average wind speed in October:
7.2mph - Average wind speed in November:
7.7mph - Average wind speed in December:
8mph
The windiest months (with the highest average wind speed) are January, February and March (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).
Average humidity
Wilmington, DE
The month with the highest relative humidity is October (78%).
The month with the lowest relative humidity is April (72%).
Average rainfall
Wilmington, DE
- Average rainfall in January:
2.36" - Average rainfall in February:
2.56" - Average rainfall in March:
2.95" - Average rainfall in April:
2.87" - Average rainfall in May:
3.19" - Average rainfall in June:
3.07"
- Average rainfall in July:
3.58" - Average rainfall in August:
4.09" - Average rainfall in September:
2.4" - Average rainfall in October:
2.72" - Average rainfall in November:
2.44" - Average rainfall in December:
3.31"
The wettest month (with the highest rainfall) is August (4.09").
The driest month (with the least rainfall) is January (2.36").
Average rainfall days
Wilmington, DE
- Average rainfall days in January:
9.3 days - Average rainfall days in February:
10.1 days - Average rainfall days in March:
14.9 days - Average rainfall days in April:
16.3 days - Average rainfall days in May:
18.7 days - Average rainfall days in June:
17.5 days
- Average rainfall days in July:
18.5 days - Average rainfall days in August:
17.3 days - Average rainfall days in September:
13.3 days - Average rainfall days in October:
12.7 days - Average rainfall days in November:
8.8 days - Average rainfall days in December:
11.5 days
The month with the highest number of rainy days is May (18.7 days).
The month with the least rainy days is November (8.8 days).
Average snowfall
Wilmington, DE
- Average snowfall in January:
3.03" - Average snowfall in February:
2.87" - Average snowfall in March:
3.58" - Average snowfall in April:
0.31" - Average snowfall in May:
0.12" - Average snowfall in June:
0"
The month with the highest snowfall is March (3.58").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Wilmington, DE
- Average snowfall days in January:
6.8 days - Average snowfall days in February:
5.8 days - Average snowfall days in March:
4.7 days - Average snowfall days in April:
0.4 days - Average snowfall days in May:
0.1 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:
0.1 days - Average snowfall days in November:
0.8 days - Average snowfall days in December:
3.2 days
The month with the highest number of snowfall days is January (6.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature
Wilmington, DE
The best month for swimming (with the highest average sea temperature) is August (73°F).
The coldest month (with the lowest average sea temperature) is February (34°F).
Average daylight / Average sunshine
Wilmington, DE
- Average daylight in January:
9h and 42min - Average daylight in February:
10h and 42min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 24min - Average daylight in June:
14h and 54min
- Average daylight in July:
14h and 42min - Average daylight in August:
13h and 42min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 6min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 24min
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 24min).
- Average sunshine in January:
5h and 0min - Average sunshine in February:
4h and 54min - Average sunshine in March:
6h and 30min - Average sunshine in April:
8h and 30min - Average sunshine in May:
8h and 36min - Average sunshine in June:
10h and 0min
- Average sunshine in July:
10h and 36min - Average sunshine in August:
10h and 6min - Average sunshine in September:
8h and 48min - Average sunshine in October:
5h and 36min - Average sunshine in November:
5h and 42min - Average sunshine in December:
5h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days
Wilmington, DE
- Average sunshine days in January:
16.8 days - Average sunshine days in February:
13.2 days - Average sunshine days in March:
12.3 days - Average sunshine days in April:
11.9 days - Average sunshine days in May:
9.8 days - Average sunshine days in June:
9.9 days
- Average sunshine days in July:
9.8 days - Average sunshine days in August:
11 days - Average sunshine days in September:
14.2 days - Average sunshine days in October:
15.5 days - Average sunshine days in November:
18.6 days - Average sunshine days in December:
15.9 days
The month with the most sunshine days is November (18.6 days).
The months with the least sunshine days are May and July (9.8 days).
Average UV index
Wilmington, 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, February, November and December (UV index 2).
Average cloud cover
Wilmington, DE
The months with the most cloud cover are February and March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility
Wilmington, 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).
