December weather forecast
Winterthur, DE

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Weather in December

The first month of the winter, December, is also a frosty month in Winterthur, Delaware, with an average temperature fluctuating between 43.7°F (6.5°C) and 32.7°F (0.4°C).

Temperature

With the onset of December, Winterthur experiences a modest temperature adjustment, with the average high-temperature gently receding from a cool 52.2°F (11.2°C) in November to a chilly 43.7°F (6.5°C). During the month of December, Winterthur experiences a steady low-temperature average of 32.7°F (0.4°C).

Humidity

The average relative humidity in December in Winterthur is 77%.

Rainfall

In Winterthur, Delaware, during December, the rain falls for 11.5 days and regularly aggregates up to 3.31" (84mm) of precipitation. In Winterthur, during the entire year, the rain falls for 168.9 days and collects up to 35.55" (903mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Winterthur. In Winterthur, Delaware, in December, snow falls for 3.2 days, with typically accumulated 1.54" (39mm) of snow. In Winterthur, during the entire year, snow falls for 21.9 days and aggregates up to 12.05" (306mm) of snow.

Daylight

December has the shortest days of the year in Winterthur, with an average of 9h and 24min of daylight.
On the first day of December, sunrise is at 7:05 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:47 pm EST.

Sunshine

In Winterthur, the average sunshine in December is 5h.

UV index

The months with the lowest UV index in Winterthur are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for average individuals.
Note: The daily maximum UV index of 2 in December interprets into the following advice:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. During bright days, sunglasses that offer UVA and UVB defense are recommended. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
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Frequently asked questions

How cold is it in Winterthur in December?

The average high-temperature, in December, in Winterthur, is 43.7°F (6.5°C), while the average low-temperature is 32.7°F (0.4°C). The average heat index (a.k.a. 'feels like', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in August is evaluated at 89.6°F (32°C).

What is the average humidity in December in Winterthur?

The average relative humidity in December is 77%.

How many days does it rain in December in Winterthur?

In Winterthur, Delaware, in December, it is raining for 11.5 days, with typically 3.31" (84mm) of accumulated precipitation.

How many days does it snow in December in Winterthur?

In December, in Winterthur, Delaware, it is snowing for 3.2 days. Throughout December, 1.54" (39mm) of snow is accumulated.

What is the month with the shortest days in Winterthur?

December has the shortest days of the year in Winterthur, Delaware, with an average of 9h and 24min of daylight.

How many hours of daylight does Winterthur have in December?

The average day length in December in Winterthur is 9h and 25min.

When are sunrise and sunset in December in Winterthur?

In December, on the first day of the month, sunrise is at 7:05 am and sunset at 4:38 pm. On the last day of the month, in Winterthur, Delaware, sunrise is at 7:23 am and sunset at 4:47 pm EST.

How long on average sun shines in December in Winterthur?

In Winterthur, the average sunshine duration in December is 5h.

What are the months with the lowest UV index in Winterthur?

The months with the lowest UV index in Winterthur, Delaware, are January, February, November and December, with an average maximum UV index of 2.

How high is the UV index in December in Winterthur?

In Winterthur, Delaware, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Winterthur, DE

Average temperature in December - Winterthur, DE
  • Average high temperature in December: 43.7°F

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).

  • Average low temperature in December: 32.7°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).

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Average pressure in December
Winterthur, DE

Average pressure in December - Winterthur, 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
Winterthur, DE

Average wind speed in December - Winterthur, DE
  • 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).

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Average humidity in December
Winterthur, DE

Average humidity in December - Winterthur, DE
  • Average humidity in December: 77%

The month with the highest relative humidity is October (78%).
The month with the lowest relative humidity is April (72%).

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Average rainfall in December
Winterthur, DE

Average rainfall in December - Winterthur, DE
  • 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").

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Average rainfall days in December
Winterthur, DE

Average rainfall days in December - Winterthur, DE
  • 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).

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Average snowfall in December
Winterthur, DE

Average snowfall in December - Winterthur, DE
  • Average snowfall in December: 1.54"

The month with the highest snowfall is March (3.58").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Winterthur, DE

Average snowfall days in December - Winterthur, DE
  • 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).

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

Average daylight in December / Average sunshine in December - Winterthur, DE
  • Average daylight in December: 9h and 2min

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 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).

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Average sunshine days in December
Winterthur, DE

Average sunshine days in December - Winterthur, DE
  • 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).

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Average UV index in December
Winterthur, DE

Average UV index in December - Winterthur, 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, February, November and December (UV index 2).

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Average cloud cover in December
Winterthur, DE

Average cloud cover in December - Winterthur, DE
  • Average cloud cover in December: 46

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).

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Average visibility in December
Winterthur, DE

Average visibility in December - Winterthur, 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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Winterthur, Delaware, USA

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