December weather forecast
Lewes, DE

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Weather in December

December in Lewes ushers in the full force of winter, depicted by falling temperatures, decreased daylight hours, and the onset of snowfall. With the daily temperature ranging from 39.2°F (4°C) to 46.9°F (8.3°C), the city sees the lowest temperatures of the year. December's weather conditions contrast greatly with November's, particularly due to the presence of 1.2 snowfall days and 0.91" (23mm) of snowfall, representing the onset of winter. Alongside significantly reduced daylight hours (9.5 hours/day), the noticeably higher cloud cover further shapes the wintry December atmosphere. Despite the chilling temperatures, warm holiday cheer envelops the city with a captivating winter wonderland aura.

Temperature

The shift from November to December coincides with a small decrease in the average high-temperature, down to a chilly 46.9°F (8.3°C) from a fresh 54.5°F (12.5°C). Nights in Lewes during December maintain a steady temperature, averaging at a wintry 39.2°F (4°C).

Humidity

The average relative humidity in December in Lewes is 76%.

Rainfall

In December, the rain falls for 11.9 days. Throughout December, 3.07" (78mm) of precipitation is accumulated. In Lewes, during the entire year, the rain falls for 173.6 days and collects up to 36.97" (939mm) of precipitation.

Snowfall

Months with snowfall are January through March, November and December. In Lewes, during December, snow falls for 1.2 days and regularly aggregates up to 0.91" (23mm) of snow. In Lewes, during the entire year, snow falls for 10.1 days and aggregates up to 3.39" (86mm) of snow.

Ocean temperature

In December, the average ocean temperature is 48.7°F (9.3°C).
Note: Swimming in 48.7°F (9.3°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

With an average of 9h and 30min of daylight, December has the shortest days of the year.
On the first day of December in Lewes, Delaware, sunrise is at 7:00 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:49 pm EST.

Sunshine

In Lewes, the average sunshine in December is 5.2h.

UV index

January and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: An average UV index of 2 in December transforms into this advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. When the Sun is at its strongest around midday, find shade and limit exposure. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
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Frequently asked questions

What are December temperatures in Lewes?

In December, in Lewes, the average high-temperature is 46.9°F (8.3°C), and the average low-temperature is 39.2°F (4°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which represents the influence of relative humidity on air temperature, in July is calculated to be 86°F (30°C).

What is the average humidity in December in Lewes?

In December, the average relative humidity is 76%.

How much does it rain in Lewes in December?

In Lewes, during December, the rain falls for 11.9 days and regularly aggregates up to 3.07" (78mm) of precipitation.

How much does it snow in Lewes in December?

In December, in Lewes, Delaware, it is snowing for 1.2 days. Throughout December, 0.91" (23mm) of snow is accumulated.

What is the ocean temperature in December in Lewes?

In Lewes, the average seawater temperature in December is 48.7°F (9.3°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the month with the shortest days in Lewes?

The month with the shortest days in Lewes, Delaware, is December, with an average of 9h and 30min of daylight.

What is the average length of the day in December in Lewes?

The average day length in December in Lewes is 9h and 31min.

What time are sunrise and sunset in December in Lewes?

On the first day of December in Lewes, Delaware, sunrise is at 7:00 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:49 pm EST.

How long on average sun shines in December in Lewes?

In Lewes, the average sunshine duration in December is 5.2h.

What is the month with the lowest UV index in Lewes?

January and December, with an average maximum UV index of 2, are months with the lowest UV index in Lewes.

What is the UV index intensity in December in Lewes?

In December, the average daily maximum UV index in Lewes is 2. A UV Index value of 2, and less, symbolizes a low health risk from exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAMJJASONDecember
Nov
December
Jan
Average high temperature
54.5°F 12.5°C
46.9°F 8.3°C
41.2°F 5.1°C
Average low temperature
46.4°F 8°C
39.2°F 4°C
32°F 0°C
Average pressure
30.12" 765mmHg
30.1" 765mmHg
30.09" 764mmHg
Average wind speed
12.1mph 19.5km/h
11.9mph 19.2km/h
12.5mph 20.1km/h
Average max. wind speed
12.9mph 20.8km/h
12.8mph 20.6km/h
13.3mph 21.4km/h
Average wind speed gusts
18.6mph 29.9km/h
18.7mph 30.1km/h
19.4mph 31.2km/h
Average humidity
73%
76%
74%
Average rainfall
2.68" 68mm
3.07" 78mm
2.2" 56mm
Average rainfall days
9.9
11.9
9.6
Average snowfall
0.08" 2mm
0.91" 23mm
0.98" 25mm
Average snowfall days
0.4
1.2
3.7
Average sea temperature
56.6°F 13.7°C
48.8°F 9.3°C
42.4°F 5.8°C
Average daylight
10h 1min
9h 3min
9h 5min
Average sunshine
5h 5min
5h 1min
5h 3min
Average sunshine days
17.6
16.3
17.1
Average UV index
3
2
2
Average cloud cover
35%
43%
41%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in December
Lewes, DE

Average temperature in December - Lewes, DE
  • Average high temperature in December: 46.9°F

The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (41.2°F).

  • Average low temperature in December: 39.2°F

The month with the highest average low temperature is July (73°F).
The coldest month (with the lowest average low temperature) is January (32°F).

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Average pressure in December
Lewes, DE

Average pressure in December - Lewes, DE
  • 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).

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Average wind speed in December
Lewes, DE

Average wind speed in December - Lewes, DE
  • Average wind speed in December: 11.9mph

The windiest month (with the highest average wind speed) is January (12.5mph).
The calmest month (with the lowest average wind speed) is August (8.3mph).

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Average humidity in December
Lewes, DE

Average humidity in December - Lewes, DE
  • Average humidity in December: 76%

The month with the highest relative humidity is May (81%).
The month with the lowest relative humidity is November (73%).

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Average rainfall in December
Lewes, DE

Average rainfall in December - Lewes, DE
  • Average rainfall in December: 3.07"

The wettest month (with the highest rainfall) is August (4.13").
The driest month (with the least rainfall) is January (2.2").

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Average rainfall days in December
Lewes, DE

Average rainfall days in December - Lewes, DE
  • Average rainfall days in December: 11.9 days

The month with the highest number of rainy days is July (18.6 days).
The month with the least rainy days is January (9.6 days).

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Average snowfall in December
Lewes, DE

Average snowfall in December - Lewes, DE
  • Average snowfall in December: 0.91"

The month with the highest snowfall is January (0.98").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in December
Lewes, DE

Average snowfall days in December - Lewes, DE
  • Average snowfall days in December: 1.2 days

The month with the highest number of snowfall days is January (3.7 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average sea temperature in December
Lewes, DE

Average sea temperature in December - Lewes, DE
  • Average sea temperature in December: 48.8°F

The best month for swimming (with the highest average sea temperature) is August (76.9°F).
The coldest month (with the lowest average sea temperature) is February (40.7°F).

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Average daylight in December /
Average sunshine in December
Lewes, DE

Average daylight in December / Average sunshine in December - Lewes, DE
  • Average daylight in December: 9h and 3min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in December: 5h and 1min

The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).

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Average sunshine days in December
Lewes, DE

Average sunshine days in December - Lewes, DE
  • Average sunshine days in December: 16.3 days

The month with the most sunshine days is November (17.6 days).
The month with the least sunshine days is May (9.8 days).

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Average UV index in December
Lewes, DE

Average UV index in December - Lewes, DE
  • Average UV index in December: 2

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).

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Average cloud cover in December
Lewes, DE

Average cloud cover in December - Lewes, DE
  • Average cloud cover in December: 43

The months with the most cloud cover are February and March (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 26).

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Average visibility in December
Lewes, DE

Average visibility in December - Lewes, DE
  • Average visibility in December: 6mi

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).

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Lewes, Delaware, USA

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