Williston
North Dakota, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Williston, ND

The first month of the winter, December, is still a freezing cold month in Williston, North Dakota, with average temperature fluctuating between 24.4°F (-4.2°C) and 3.4°F (-15.9°C).

Temperature

In Williston, North Dakota, the average high-temperature in December decreases, from a wintry 37.9°F (3.3°C) in November, to a subzero cold 24.4°F (-4.2°C). The average low-temperature, is 3.4°F (-15.9°C).

Humidity

With an average relative humidity of 77.1%, December is the most humid month in Williston, North Dakota.

Rainfall

In Williston, in December, during 8.6 rainfall days, 0.6" (15.7mm) of precipitation is typically accumulated. Throughout the year, in Williston, there are 96.5 rainfall days, and 14.4" (364.9mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Williston are January through May, September through December.

Daylight

With an average of 8.4h of daylight, December has the shortest days of the year in Williston.

Sunshine

With an average of 4h of sunshine, December has the least sunshine of the year in Williston.

UV index

Months with the lowest UV index in Williston are January, February, November and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a minimal health vulnerability from the exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 1 interpret into the following advice:
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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in December in Williston?

In Williston, North Dakota, in December, the average high-temperature is 24.4°F (-4.2°C), and the average low-temperature is 3.4°F (-15.9°C).

What is the most humid month in Williston?

The most humid month in Williston, North Dakota, is December, with an average relative humidity of 77.1%.

What is the average humidity in December in Williston?

The average relative humidity in December in Williston is 77.1%.

How much does it rain in Williston in December?

In Williston, North Dakota, in December, during 8.6 rainfall days, 0.6" (15.7mm) of precipitation is typically accumulated.

How many days does it snow in December in Williston?

In December, it is snowing for 9.1 days. Throughout December, 9.5" (241.3mm) of snow is accumulated.

What is the month with the shortest days in Williston?

December has the shortest days of the year in Williston, North Dakota, with an average of 8.4h of daylight.

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

In Williston, the average length of the day in December is 8.4h.

What is the month with the least sunshine in Williston?

December has the least sunshine of the year in Williston, North Dakota, with an average of 4h of sunshine.

How many hours of sunshine does Williston have in December?

The average sunshine in December in Williston is 4h.

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

Months with the lowest UV index in Williston are January, February, November and December, with an average maximum UV index of 1.

How high is the UV index in December in Williston?

In December, the average daily maximum UV index in Williston, North Dakota, is 1. A UV Index value of 2, and less, symbolizes a low health risk from unprotected exposure to the UV radiation.
Average temperature in December - Williston, ND
  • Average high temperature in December: 24.4°F

The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (21.9°F).

  • Average low temperature in December: 3.3°F

The month with the highest average low temperature is July (55.8°F).
The coldest month (with the lowest average low temperature) is January (0.1°F).

Average humidity in December - Williston, ND
  • Average humidity in December: 77.1%

The month with the highest relative humidity is December (77.1%).
The month with the lowest relative humidity is August (54.9%).

Average rainfall in December - Williston, ND
  • Average rainfall in December: 0.6"

Wettest months (with the highest rainfall) are June and July (2.5").
The driest month (with the lowest rainfall) is February (0.4").

Average rainfall days in December - Williston, ND
  • Average rainfall days in December: 8.6 days

The month with the highest number of rainy days is June (11.5 days).
The month with the lowest number of rainy days is February (6 days).

Average snowfall in December - Williston, ND
  • Average snowfall in December: 9.5"

The month with the highest snowfall is January (10").
Months with the lowest snowfall are June, July and August (0").

Average snowfall days in December - Williston, ND
  • Average snowfall days in December: 9.1 days

The month with the highest number of snowfall days is December (9.1 days).
Months with the lowest number of snowfall days are June, July and August (0 days).

Average daylight in December / Average sunshine in December - Williston, ND
  • Average daylight in December: 8.4h

The month with the longest days is June (Average daylight: 16h).
The month with shortest days is December (Average daylight: 8.4h).

  • Average sunshine in December: 4h

The month with most sunshine is July (Average sunshine: 11.8h).
The month with least sunshine is December (Average sunshine: 4h).

Average UV index in December - Williston, ND
  • Average UV index in December: 1

The month with the highest UV index is July (UV index 8).
Months with the lowest UV index are January, February, November and December (UV index 1).