December weather forecast
Morongo Valley, CA

Share

Weather in December

December, the first month of the winter in Morongo Valley, is also a moderate month, with temperature in the range of an average high of 55.9°F (13.3°C) and an average low of 41.4°F (5.2°C).

Temperature

With its high average temperature of 55.9°F (13.3°C) and a low of 41.4°F (5.2°C), December is regarded as the coldest month.

Humidity

With an average relative humidity of 47%, December is the most humid month.

Rainfall

The month with the most rainfall is December, when the rain falls for 4 days and typically aggregates up to 0.47" (12mm) of precipitation.

Snowfall

February and December are months with snowfall. December is the month with the most snowfall. Snow falls for 0.2 days and accumulates 0.35" (9mm) 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, sunrise is at 6:34 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 4:47 pm PST.

Sunshine

December has the least sunshine of the year, with an average of 7h of sunshine.

UV index

November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: The maximum UV index of 3 during December translates into these guidelines:
Guard yourself - Precautionary measures against sun damage are advocated. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Updated: Aug 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest month?

With average high and low temperatures of 55.9°F (13.3°C) and 41.4°F (5.2°C) respectively, December is Morongo Valley's coldest month.

What are the temperatures in December?

In December, the average high-temperature and low-temperature are 55.9°F (13.3°C) and 41.4°F (5.2°C) respectively.

What is the most humid month?

The most humid month is December, with an average relative humidity of 47%.

What is the average humidity in December?

In December, the average relative humidity is 47%.

What is the rainiest month?

December is the month with the most rainfall. Rain falls for 4 days and accumulates 0.47" (12mm) of precipitation.

How much does it rain in December?

In December, the rain falls for 4 days. Throughout December, 0.47" (12mm) of precipitation is accumulated.

When does it snow the most?

The month with the most snowfall is December, when snow falls for 0.2 days and typically aggregates up to 0.35" (9mm) of snow.

When does it start to snow?

December is the first month it typically snows. Throughout December, in the average 0.2 snowfall days, it receives 0.35" (9mm) of snow.

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.

How many hours of daylight does Morongo Valley have in December?

In December, the average day length is 9h and 56min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 6:34 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 4:47 pm PST.

What is the month with the least sunshine?

December has the least sunshine of the year, with an average of 7h of sunshine.

How long on average sun shines in December?

In Morongo Valley, the average sunshine duration in December is 7h.

When is the lowest UV index?

November and December, with an average maximum UV index of 3, are months with the lowest UV index.

How high is the UV index in December?

In December, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Morongo Valley, CA

Average temperature in December - Morongo Valley, CA
  • Average high temperature in December: 55.9°F

The warmest month (with the highest average high temperature) is July (92.8°F).
The month with the lowest average high temperature is December (55.9°F).

  • Average low temperature in December: 41.4°F

The month with the highest average low temperature is August (70.9°F).
The coldest month (with the lowest average low temperature) is December (41.4°F).

Average pressure in December
Morongo Valley, CA

Average pressure in December - Morongo Valley, CA
  • Average pressure in December: 30.07"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.81"Hg).

Average wind speed in December
Morongo Valley, CA

Average wind speed in December - Morongo Valley, CA
  • Average wind speed in December: 6.7mph

The windiest month (with the highest average wind speed) is April (8.9mph).
The calmest month (with the lowest average wind speed) is January (6.5mph).

Average humidity in December
Morongo Valley, CA

Average humidity in December - Morongo Valley, CA
  • Average humidity in December: 47%

The month with the highest relative humidity is December (47%).
The month with the lowest relative humidity is August (26%).

Average rainfall in December
Morongo Valley, CA

Average rainfall in December - Morongo Valley, CA
  • Average rainfall in December: 0.47"

The wettest month (with the highest rainfall) is December (0.47").
The driest month (with the least rainfall) is June (0").

Average rainfall days in December
Morongo Valley, CA

Average rainfall days in December - Morongo Valley, CA
  • Average rainfall days in December: 4 days

The months with the highest number of rainy days are July and December (4 days).
The month with the least rainy days is June (0.8 days).

Average snowfall in December
Morongo Valley, CA

Average snowfall in December - Morongo Valley, CA
  • Average snowfall in December: 0.35"

The month with the highest snowfall is December (0.35").
The months with the least snowfall are January, March, April, May, June, July, August, September, October and November (0").

Average snowfall days in December
Morongo Valley, CA

Average snowfall days in December - Morongo Valley, CA
  • Average snowfall days in December: 0.2 days

The month with the highest number of snowfall days is February (0.3 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).

Average daylight in December /
Average sunshine in December
Morongo Valley, CA

Average daylight in December / Average sunshine in December - Morongo Valley, CA
  • 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 0min

The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 7h and 0min).

Average sunshine days in December
Morongo Valley, CA

Average sunshine days in December - Morongo Valley, CA
  • Average sunshine days in December: 25.5 days

The month with the most sunshine days is October (28.8 days).
The month with the least sunshine days is July (24.5 days).

Average UV index in December
Morongo Valley, CA

Average UV index in December - Morongo Valley, CA
  • Average UV index in December: 3

The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are November and December (UV index 3).

Average cloud cover in December
Morongo Valley, CA

Average cloud cover in December - Morongo Valley, CA
  • 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 5).

Average visibility in December
Morongo Valley, CA

Average visibility in December - Morongo Valley, CA
  • 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).

Morongo Valley, California, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location