December weather forecast
Fort Sumner, NM

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Weather in December

In December, Fort Sumner, New Mexico, fully embraces winter, with the temperature touching a low of 31.5°F (-0.3°C). The shortest daylight hours are observed during this month. The wind speed reaches its peak, contributing to the overall cold weather. Despite the dip in temperature and increased wind speed, rainfall remains constant. The weather remains predominantly clear with minimal cloud coverage, perfect for enjoying the holiday season.

Temperature

With average high and low temperatures of 49.3°F (9.6°C) and 31.5°F (-0.3°C) respectively, December is Fort Sumner's coldest month.

Humidity

December is the most humid month in Fort Sumner, with an average relative humidity of 52%.

Rainfall

In December, in Fort Sumner, the rain falls for 3.2 days. Throughout December, 0.51" (13mm) of precipitation is accumulated. Throughout the year, in Fort Sumner, there are 78.6 rainfall days, and 9.06" (230mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Fort Sumner, New Mexico, are January through April, October through December. In Fort Sumner, in December, during 3.5 snowfall days, 1.65" (42mm) of snow is typically accumulated. Throughout the year, in Fort Sumner, there are 13.6 snowfall days, and 8.19" (208mm) of snow is accumulated.

Daylight

The month with the shortest days in Fort Sumner is December, with an average of 9h and 54min of daylight.
On the first day of the month, sunrise is at 6:45 am and sunset at 4:46 pm. On the last day of December, sunrise is at 7:03 am and sunset at 4:57 pm MST.

Sunshine

The months with the least sunshine in Fort Sumner are January and December, with an average of 7.1h of sunshine.

UV index

The month with the lowest UV index in Fort Sumner is December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The UV index of 2 during December leads to these advisories:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Updated: Feb 13, 2024 | Published by: Weather U.S. | About Us / Weather Forecasting / Data Sources

Frequently asked questions

What time of the year is the coldest in Fort Sumner?

In Fort Sumner, the lowest temperatures are generally noted in December, averaging a high of 49.3°F (9.6°C) and a low of 31.5°F (-0.3°C).

What is the temperature in December in Fort Sumner?

In December, in Fort Sumner, the average high-temperature is 49.3°F (9.6°C), and the average low-temperature is 31.5°F (-0.3°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which represents the influence of relative humidity on air temperature, in September is appraised at 82.4°F (28°C).

What is the most humid month in Fort Sumner?

The most humid month in Fort Sumner, New Mexico, is December, with an average relative humidity of 52%.

What is the average humidity in December in Fort Sumner?

In Fort Sumner, New Mexico, the average relative humidity in December is 52%.

How much does it rain in Fort Sumner in December?

In December, in Fort Sumner, New Mexico, the rain falls for 3.2 days. Throughout December, 0.51" (13mm) of precipitation is accumulated.

How many days does it snow in December in Fort Sumner?

In Fort Sumner, in December, during 3.5 snowfall days, 1.65" (42mm) of snow is typically accumulated.

What is the month with the shortest days in Fort Sumner?

The month with the shortest days is December, with an average of 9h and 54min of daylight.

How many hours of daylight does Fort Sumner have in December?

In December, the average day length is 9h and 53min.

When is the sunrise / sunset in December in Fort Sumner?

In December, on the first day of the month, sunrise is at 6:45 am and sunset at 4:46 pm. On the last day of the month, in Fort Sumner, New Mexico, sunrise is at 7:03 am and sunset at 4:57 pm MST.

What are the months with the least sunshine in Fort Sumner?

The months with the least sunshine in Fort Sumner are January and December, with an average of 7.1h of sunshine.

How long on average sun shines in December in Fort Sumner?

The average sunshine duration in December is 7.1h.

When is the lowest UV index in Fort Sumner?

December is the month with the lowest UV index in Fort Sumner, New Mexico, with an average maximum UV index of 2.

How high is the UV index in December in Fort Sumner?

The average daily maximum UV index in December in Fort Sumner, New Mexico, is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to UV radiation.
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
Fort Sumner, NM

Average temperature in December - Fort Sumner, NM
  • Average high temperature in December: 49.3°F

The warmest months (with the highest average high temperature) are June and July (90°F).
The month with the lowest average high temperature is December (49.3°F).

  • Average low temperature in December: 31.5°F

The month with the highest average low temperature is July (68.9°F).
The coldest month (with the lowest average low temperature) is January (30.6°F).

Average pressure in December
Fort Sumner, NM

Average pressure in December - Fort Sumner, NM
  • Average pressure in December: 30.09"Hg

The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is April (29.86"Hg).

Average wind speed in December
Fort Sumner, NM

Average wind speed in December - Fort Sumner, NM
  • Average wind speed in December: 11.7mph

The windiest month (with the highest average wind speed) is April (12.9mph).
The calmest month (with the lowest average wind speed) is August (9mph).

Average humidity in December
Fort Sumner, NM

Average humidity in December - Fort Sumner, NM
  • Average humidity in December: 52%

The month with the highest relative humidity is December (52%).
The month with the lowest relative humidity is April (31%).

Average rainfall in December
Fort Sumner, NM

Average rainfall in December - Fort Sumner, NM
  • Average rainfall in December: 0.51"

The wettest month (with the highest rainfall) is July (1.61").
The driest month (with the least rainfall) is January (0.35").

Average rainfall days in December
Fort Sumner, NM

Average rainfall days in December - Fort Sumner, NM
  • Average rainfall days in December: 3.2 days

The month with the highest number of rainy days is July (12.5 days).
The month with the least rainy days is November (2.4 days).

Average snowfall in December
Fort Sumner, NM

Average snowfall in December - Fort Sumner, NM
  • Average snowfall in December: 1.65"

The month with the highest snowfall is November (1.85").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Fort Sumner, NM

Average snowfall days in December - Fort Sumner, NM
  • Average snowfall days in December: 3.5 days

The months with the highest number of snowfall days are January and December (3.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Fort Sumner, NM

Average daylight in December / Average sunshine in December - Fort Sumner, NM
  • Average daylight in December: 9h and 5min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in December: 7h and 1min

The month with the most sunshine is June (Average sunshine: 11h and 54min).
The months with the least sunshine are January and December (Average sunshine: 7h and 6min).

Average sunshine days in December
Fort Sumner, NM

Average sunshine days in December - Fort Sumner, NM
  • Average sunshine days in December: 24.6 days

The month with the most sunshine days is November (25.5 days).
The month with the least sunshine days is July (14 days).

Average UV index in December
Fort Sumner, NM

Average UV index in December - Fort Sumner, NM
  • Average UV index in December: 2

The month with the highest UV index is June (UV index 7).
The month with the lowest UV index is December (UV index 2).

Average cloud cover in December
Fort Sumner, NM

Average cloud cover in December - Fort Sumner, NM
  • Average cloud cover in December: 19

The month with the most cloud cover is December (Cloud cover 19).
The month with the least cloud cover is June (Cloud cover 12).

Average visibility in December
Fort Sumner, NM

Average visibility in December - Fort Sumner, NM
  • 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).

Fort Sumner, New Mexico, USA

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