January weather forecast
New Castle, DE

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Weather in January

New Castle, Delaware experiences a chilly start to the year in January. Snowfall is common, reaching a peak monthly average of 1.69" (43mm), resulting in snowfall days that are the highest in the year at 5.2 days. The city's weather is characterized by a mixture of clear, cloudy, and overcast days. The level of atmospheric pressure is considerable, affecting the weather patterns. The wind blows at a consistent speed, setting the tone for the rest of the winter season.

Temperature

January, with its high-temperature average of 37.8°F (3.2°C) and a low-temperature average of 26.1°F (-3.3°C), is the coldest month in New Castle.

Humidity

The average relative humidity in January in New Castle is 74%.

Rainfall

January is the month with the least rainfall in New Castle. Rain falls for 7.8 days and accumulates 1.38" (35mm) of precipitation.

Snowfall

Months with snowfall 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 January, the average ocean temperature is 42.4°F (5.8°C).
Note: Unprotected swimming in 42.4°F (5.8°C) is dangerous due to potential cold shock. Especially when temperatures go below 50°F (10°C), leading to hyperventilation.

Daylight

In January, the average length of the day is 9h and 44min.
On the first day of January in New Castle, Delaware, sunrise is at 7:22 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 5:20 pm EST.

Sunshine

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

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the average person.
Note: The maximum UV index, 2 during January, leads to the following recommendations:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. 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. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
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Frequently asked questions

What time of the year is the coldest in New Castle?

January, with an average high of 37.8°F (3.2°C) and a low of 26.1°F (-3.3°C), signifies the coldest month of the year in New Castle, Delaware.

Is January cold in New Castle?

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

What is the average humidity in January in New Castle?

In New Castle, Delaware, the average relative humidity in January 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 many days does it rain in January in New Castle?

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?

January is the month with the most snowfall in New Castle, Delaware. Snow falls for 5.2 days and accumulates 1.69" (43mm) of snow.

How much does it snow in New Castle in January?

In January, in New Castle, it is snowing for 5.2 days. Throughout January, 1.69" (43mm) of snow is accumulated.

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). 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.

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

In January, the average day length in New Castle 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 7:22 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 5:20 pm EST.

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

The average sunshine duration in January is 5.1h.

When is the lowest UV index in New Castle?

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

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

In January, the average daily maximum UV index in New Castle is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability 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 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 4min

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 1min

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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New Castle, Delaware, USA

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