December weather forecast and climate
Grafton, ND

December, the first month of the winter, in Grafton, is still a freezing cold month, with temperature in the range of an average low of 7.5°F (-13.6°C) and an average high of 18.3°F (-7.6°C).

Temperature

In December, the average high-temperature plummets, from a cold 34.9°F (1.6°C) in November, to a freezing cold 18.3°F (-7.6°C). In Grafton, North Dakota, the average low-temperature is 7.5°F (-13.6°C).

Humidity

The average relative humidity in Grafton is 89%.

Rainfall

In Grafton, in December, it is raining for 2.5 days, with typically 0.79" (20mm) of accumulated precipitation. In Grafton, during the entire year, the rain falls for 97.8 days and collects up to 15.83" (402mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. The month with the most snowfall is December when snow falls for 14 days and typically aggregates up to 3.94" (100mm) of snow.

Daylight

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

Sunshine

The average sunshine in December is 3.8h.

UV index

In Grafton, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 2 interpret into the following advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. 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 Grafton?

In Grafton, in December, the average high-temperature is 18.3°F (-7.6°C), and the average low-temperature is 7.5°F (-13.6°C).

What is the average humidity in December in Grafton?

In Grafton, the average relative humidity in December is 89%.

How many days does it rain in December in Grafton?

In December, in Grafton, the rain falls for 2.5 days. Throughout December, 0.79" (20mm) of precipitation is accumulated.

How much does it snow in Grafton in December?

In Grafton, North Dakota, during December, snow falls for 14 days and regularly aggregates up to 3.94" (100mm) of snow.

What is the snowiest month in Grafton?

The month with the most snowfall is December when snow falls for 14 days and typically aggregates up to 3.94" (100mm) of snow.

What is the month with the shortest days in Grafton?

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

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

The average length of the day in December in Grafton, North Dakota, is 8.4h.

How long on average sun shines in December in Grafton?

In Grafton, North Dakota, the average sunshine in December is 3.8h.

How high is the UV index in December in Grafton?

In December, the average daily maximum UV index in Grafton, North Dakota, is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from the exposure to the Sun's UV rays.
Average temperature in December - Grafton, ND
  • Average high temperature in December: -7.6°C

The warmest month (with the highest average high temperature) is August (26.9°C).
The month with the lowest average high temperature is January (-9.6°C).

  • Average low temperature in December: -13.6°C

The month with the highest average low temperature is July (15.5°C).
The coldest month (with the lowest average low temperature) is January (-17.3°C).

Average pressure in December - Grafton, ND
  • Average pressure in December: 1020mbar

The month with the highest atmospheric pressure is February (1021.5mbar).
The month with the lowest atmospheric pressure is June (1010.9mbar).

Average wind speed in December - Grafton, ND
  • Average wind speed in December: 15.5km/h

The windiest month (with the highest average wind speed) is October (17km/h).
The calmest months (with the lowest average wind speed) are July and August (13.1km/h).

Average humidity in December - Grafton, ND
  • Average humidity in December: 89%

The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is August (59%).

Average rainfall in December - Grafton, ND
  • Average rainfall in December: 20mm

The wettest month (with the highest rainfall) is June (71mm).
The driest months (with the least rainfall) are January and February (14mm).

Average rainfall days in December - Grafton, ND
  • Average rainfall days in December: 2.5 days

The month with the highest number of rainy days is June (15.9 days).
The month with the least rainy days is February (1.6 days).

Average snowfall in December - Grafton, ND
  • Average snowfall in December: 100mm

The month with the highest snowfall is December (100mm).
Months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in December - Grafton, ND
  • Average snowfall days in December: 14 days

The month with the highest number of snowfall days is January (14.7 days).
Months with the least snowfall days are June, July, August and September (0 days).

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

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

  • Average sunshine in December: 3.8h

The month with the most sunshine is July (Average sunshine: 11h).
The month with the least sunshine is January (Average sunshine: 3.2h).

Average sunshine days in December - Grafton, ND
  • Average sunshine days in December: 17 days

The month with the most sunshine days is August (19.8 days).
The month with the least sunshine days is June (11.5 days).

Average UV index in December - Grafton, ND
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January, February and November (UV index 1).

Average cloud cover in December - Grafton, ND
  • Average cloud cover in December: 61

The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 24).

Average visibility in December - Grafton, ND
  • Average visibility in December: 8km

Months with the highest visibility are May, July, August and September (10km).
Months with the lowest visibility are January, February, March and December (8km).