December weather forecast
Etiwanda, CA

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Weather in December

The first month of the winter, December, is also an enjoyable month in Etiwanda, California, with an average temperature varying between 45.3°F (7.4°C) and 61.7°F (16.5°C).

Temperature

Etiwanda witnesses the coldest weather in December, with temperatures averaging a high of 61.7°F (16.5°C) and a low of 45.3°F (7.4°C).

Humidity

In December, the average relative humidity is 51%.

Rainfall

In Etiwanda, in December, during 5.5 rainfall days, 0.91" (23mm) of precipitation is typically accumulated. In Etiwanda, California, during the entire year, the rain falls for 42.3 days and collects up to 4.53" (115mm) of precipitation.

Snowfall

January, March through December are months without snowfall.

Daylight

The month with the shortest days is December, with an average of 9h and 54min of daylight.
On the first day of December, sunrise is at 6:38 am and sunset at 4:40 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 4:51 pm PST.

Sunshine

The months with the least sunshine are February and December, with an average of 6.9h of sunshine.

UV index

December is the month with the lowest UV index, with an average maximum UV index of 3. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for average individuals.
Note: The UV index of 3 in December translates into these instructions:
Exercise prevention - Protecting skin and eyes from harm is required. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Updated: Aug 22, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What month is the coldest?

December is the month that records the lowest temperatures, with averages ranging from a high of 61.7°F (16.5°C) to a low of 45.3°F (7.4°C).

What is the average December temperature?

The average high-temperature and low-temperature during December are 61.7°F (16.5°C) and 45.3°F (7.4°C) respectively. The average heat index (a.k.a. 'apparent temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in September is calculated to be 89.6°F (32°C).

What is the average humidity in December?

In December, the average relative humidity in Etiwanda is 51%.

How many days does it rain in December in Etiwanda?

In December, the rain falls for 5.5 days. Throughout December, 0.91" (23mm) of precipitation is accumulated.

When it does not snow?

In Etiwanda, snow does not fall in January, March through December.

What is the month with the shortest days?

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

How many hours of daylight does Etiwanda have in December?

In December, the average day length is 9h and 55min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 6:38 am and sunset at 4:40 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 4:51 pm PST.

What are the months with the least sunshine?

February and December, with an average of 6.9h of sunshine, are months with the least sunshine.

How long on average sun shines in December?

In Etiwanda, the average sunshine duration in December is 6.9h.

When is the lowest UV index?

December is the month with the lowest UV index, with an average maximum UV index of 3.

How high is the UV index in December?

In Etiwanda, the average daily maximum UV index in December is 3. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to Sun's UV rays.
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
Etiwanda, CA

Average temperature in December - Etiwanda, CA
  • Average high temperature in December: 61.7°F

The warmest month (with the highest average high temperature) is August (91.8°F).
The month with the lowest average high temperature is December (61.7°F).

  • Average low temperature in December: 45.3°F

The month with the highest average low temperature is August (66.6°F).
The coldest months (with the lowest average low temperature) are February and December (45.3°F).

Average pressure in December
Etiwanda, CA

Average pressure in December - Etiwanda, 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 (29.86"Hg).

Average wind speed in December
Etiwanda, CA

Average wind speed in December - Etiwanda, CA
  • Average wind speed in December: 5.2mph

The windiest month (with the highest average wind speed) is May (5.9mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).

Average humidity in December
Etiwanda, CA

Average humidity in December - Etiwanda, CA
  • Average humidity in December: 51%

The months with the highest relative humidity are February, March and May (53%).
The month with the lowest relative humidity is August (41%).

Average rainfall in December
Etiwanda, CA

Average rainfall in December - Etiwanda, CA
  • Average rainfall in December: 0.91"

The wettest month (with the highest rainfall) is February (0.98").
The driest month (with the least rainfall) is June (0.04").

Average rainfall days in December
Etiwanda, CA

Average rainfall days in December - Etiwanda, CA
  • Average rainfall days in December: 5.5 days

The month with the highest number of rainy days is March (6.3 days).
The month with the least rainy days is June (0.9 days).

Average snowfall days in December
Etiwanda, CA

Average snowfall days in December - Etiwanda, CA
  • Average snowfall days in December: 0 days

The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

Average daylight in December /
Average sunshine in December
Etiwanda, CA

Average daylight in December / Average sunshine in December - Etiwanda, 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: 6h and 5min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are February and December (Average sunshine: 6h and 54min).

Average sunshine days in December
Etiwanda, CA

Average sunshine days in December - Etiwanda, CA
  • Average sunshine days in December: 24.4 days

The month with the most sunshine days is June (28.3 days).
The month with the least sunshine days is February (22.8 days).

Average UV index in December
Etiwanda, CA

Average UV index in December - Etiwanda, CA
  • Average UV index in December: 3

The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).

Average cloud cover in December
Etiwanda, CA

Average cloud cover in December - Etiwanda, CA
  • Average cloud cover in December: 21

The months with the most cloud cover are February and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).

Average visibility in December
Etiwanda, CA

Average visibility in December - Etiwanda, 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).

Etiwanda, California, USA

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