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

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

Humidity

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

Rainfall

In Fort Sumner, in December, it is raining for 3.2 days, with typically 0.51" (13mm) of accumulated precipitation. In Fort Sumner, during the entire year, the rain falls for 78.6 days and collects up to 9.06" (230mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall. In Fort Sumner, in December, during 3.5 snowfall days, 1.65" (42mm) of snow is typically accumulated. In Fort Sumner, during the entire year, snow falls for 13.6 days and aggregates up to 8.19" (208mm) of snow.

Daylight

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

Sunshine

The months with the least sunshine 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 of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In December, an average UV index of 2 transforms into the following instructions:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. Around midday, solar radiation is most harmful; hence, exposure should be limited. Always opt for UVA and UVB-resistant sunglasses on radiant days. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Updated: Aug 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What time of the year is the coldest?

Fort Sumner's December weather, marked by an average high temperature of 49.3°F (9.6°C) and an average low temperature of 31.5°F (-0.3°C), is the coldest in the year.

What are the temperatures in December?

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

What is the most humid month?

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

What is the average humidity in December?

The average relative humidity in December is 52%.

How much does it rain in December?

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

What is the month with the shortest days?

With an average of 9h and 54min of daylight, December has the shortest days of the year.

What is the average length of the day in December?

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

When is the sunrise / sunset in December?

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, sunrise is at 7:03 am and sunset at 4:57 pm MST.

What is the month with the least sunshine in Fort Sumner?

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

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

In December, the average sunshine duration in Fort Sumner is 7.1h.

When is the lowest UV index?

With an average maximum UV index of 2, December is the month with the lowest UV index.

How high is the UV index in December?

The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's 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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