January weather forecast
New Castle, DE

Weather in January

January, like December, in New Castle, Delaware, is another cold winter month, with temperature in the range of an average high of 37.8°F (3.2°C) and an average low of 26.1°F (-3.3°C).

Temperature

The coldest month is January, with an average high-temperature of 37.8°F (3.2°C) and an average low-temperature of 26.1°F (-3.3°C).

Humidity

In January, the average relative humidity is 74%.

Rainfall

The month with the least rainfall in New Castle is January, when the rain falls for 7.8 days and typically collects 1.38" (35mm) of precipitation.

Snowfall

Months with snowfall in New Castle are January through April, November and December. The month with the most snowfall is January, when snow falls for 5.2 days and typically aggregates up to 1.69" (43mm) of snow.

Ocean temperature

In New Castle, Delaware, the average water temperature is 42.4°F (5.8°C).
Note: Swimming in 42.4°F (5.8°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

In New Castle, the average length of the day in January is 9h and 44min.
On the first day of January in New Castle, sunrise is at 7:23 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 5:20 pm EST.

Sunshine

In New Castle, the average sunshine in January is 5.1h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in New Castle. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 2 in January transform into the following instructions:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in New Castle?

With an average high-temperature of 37.8°F (3.2°C) and an average low-temperature of 26.1°F (-3.3°C), January is the coldest month.

What is the temperature in January in New Castle?

In January, in New Castle, the average high-temperature is 37.8°F (3.2°C), and the average low-temperature is 26.1°F (-3.3°C).

What is the average humidity in January in New Castle?

In January, the average relative humidity in New Castle is 74%.

What is the driest month in New Castle?

The month with the least rainfall in New Castle is January, when the rain falls for 7.8 days and typically collects 1.38" (35mm) of precipitation.

How much does it rain in New Castle in January?

In New Castle, in January, during 7.8 rainfall days, 1.38" (35mm) of precipitation is typically accumulated.

What is the snowiest month in New Castle?

The month with the most snowfall in New Castle, Delaware, is January, when snow falls for 5.2 days and typically aggregates up to 1.69" (43mm) of snow.

How many days does it snow in January in New Castle?

In New Castle, in January, snow falls for 5.2 days, with typically accumulated 1.69" (43mm) of snow.

What is the water temperature in January in New Castle?

In New Castle, Delaware, the average seawater temperature in January is 42.4°F (5.8°C). Swimming in 42.4°F (5.8°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.

How many hours of daylight does New Castle have in January?

The average day length in January in New Castle, Delaware, is 9h and 44min.

When is the sunrise / sunset in January in New Castle?

On the first day of January in New Castle, sunrise is at 7:23 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 5:20 pm EST.

How long on average sun shines in January in New Castle?

In January, the average sunshine duration in New Castle is 5.1h.

What is the month with the lowest UV index in New Castle?

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

What is the UV index intensity in January in New Castle?

In January, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
New Castle, DE

Average temperature in January - New Castle, DE
  • Average high temperature in January: 37.8°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 (37.8°F).

  • Average low temperature in January: 26.1°F

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).

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Average pressure in January
New Castle, DE

Average pressure in January - New Castle, DE
  • Average pressure in January: 30.09"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

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Average wind speed in January
New Castle, DE

Average wind speed in January - New Castle, DE
  • Average wind speed in January: 8.7mph

The windiest months (with the highest average wind speed) are February and March (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

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Average humidity in January
New Castle, DE

Average humidity in January - New Castle, DE
  • Average humidity in January: 74%

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 January
New Castle, DE

Average rainfall in January - New Castle, DE
  • Average rainfall in January: 1.38"

The wettest month (with the highest rainfall) is August (2.83").
The driest month (with the least rainfall) is January (1.38").

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Average rainfall days in January
New Castle, DE

Average rainfall days in January - New Castle, DE
  • Average rainfall days in January: 7.8 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (7.8 days).

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Average snowfall in January
New Castle, DE

Average snowfall in January - New Castle, DE
  • Average snowfall in January: 1.69"

The month with the highest snowfall is January (1.69").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in January
New Castle, DE

Average snowfall days in January - New Castle, DE
  • Average snowfall days in January: 5.2 days

The month with the highest number of snowfall days is January (5.2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average sea temperature in January
New Castle, DE

Average sea temperature in January - New Castle, DE
  • Average sea temperature in January: 42.4°F

The best month for swimming (with the highest average sea temperature) is August (76.3°F).
The coldest month (with the lowest average sea temperature) is February (40.9°F).

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Average daylight in January /
Average sunshine in January
New Castle, DE

Average daylight in January / Average sunshine in January - New Castle, DE
  • Average daylight in January: 9h and 44min

The month with the longest days is June (Average daylight: 14h and 56min).
The month with the shortest days is December (Average daylight: 9h and 25min).

  • Average sunshine in January: 5h and 6min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).

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Average sunshine days in January
New Castle, DE

Average sunshine days in January - New Castle, DE
  • Average sunshine days in January: 19.3 days

The month with the most sunshine days is November (20.1 days).
The month with the least sunshine days is May (11.8 days).

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Average UV index in January
New Castle, DE

Average UV index in January - New Castle, DE
  • Average UV index in January: 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 January
New Castle, DE

Average cloud cover in January - New Castle, DE
  • Average cloud cover in January: 44

The months with the most cloud cover are February and March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).

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Average visibility in January
New Castle, DE

Average visibility in January - New Castle, DE
  • Average visibility in January: 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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