December weather forecast
Westley, CA

Share

Weather in December

December, the first month of the winter in Westley, is still a mild month, with an average temperature varying between 55.4°F (13°C) and 41°F (5°C).

Temperature

December is the coldest month, with an average high-temperature of 55.4°F (13°C) and an average low-temperature of 41°F (5°C).

Humidity

The average relative humidity in December is 71%.

Rainfall

The wettest months are March and December, with an average 0.47" (12mm) of rainfall.

Daylight

The month with the shortest days is December, with an average of 9h and 36min of daylight.
On the first day of December, sunrise is at 7:01 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:56 pm PST.

Sunshine

With an average of 6h of sunshine, December has the least sunshine of the year.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: The maximum UV index of 3 during December translates into these guidelines:
Ensure safety - Sun damage prevention is strongly urged. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. 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.
Updated: Aug 24, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What part of the year is the coldest?

Westley witnesses the coldest weather in December, with temperatures averaging a high of 55.4°F (13°C) and a low of 41°F (5°C).

What is the usual temperature for Westley in December?

An average high-temperature, in December, in Westley, is 55.4°F (13°C) and the average low-temperature is 41°F (5°C). In September, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, is appraised at 91.4°F (33°C).

What is the average humidity in December?

The average relative humidity in December is 71%.

What is the wettest month?

The months with the most rainfall are March and December, with an average 0.47" (12mm) of precipitation.

How many days does it rain in December?

In Westley, during December, the rain falls for 6.9 days and regularly aggregates up to 0.47" (12mm) of precipitation.

What is the month with the shortest days in Westley?

The month with the shortest days is December, with an average of 9h and 36min of daylight.

How many hours of daylight does Westley have in December?

In December, the average day length is 9h and 37min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:01 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:56 pm PST.

What is the month with the least sunshine?

December has the least sunshine of the year, with an average of 6h of sunshine.

How many hours of sunshine does Westley have in December?

The average sunshine duration in December is 6h.

What is the month with the lowest UV index?

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

What is the UV index intensity in December?

The average daily maximum UV index in December is 3. A UV Index value of 3 to 5 symbolizes a medium health risk from exposure to the Sun's UV radiation.
Average low temperature
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Westley, CA

Average temperature in December - Westley, CA
  • Average high temperature in December: 55.4°F

The warmest month (with the highest average high temperature) is July (96.4°F).
The month with the lowest average high temperature is December (55.4°F).

  • Average low temperature in December: 41°F

The months with the highest average low temperature are July and August (60.8°F).
The coldest months (with the lowest average low temperature) are January and December (41°F).

Average pressure in December
Westley, CA

Average pressure in December - Westley, CA
  • Average pressure in December: 30.12"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in December
Westley, CA

Average wind speed in December - Westley, CA
  • Average wind speed in December: 5.5mph

The windiest month (with the highest average wind speed) is June (6.7mph).
The calmest months (with the lowest average wind speed) are January and November (5.1mph).

Average humidity in December
Westley, CA

Average humidity in December - Westley, CA
  • Average humidity in December: 71%

The month with the highest relative humidity is January (72%).
The month with the lowest relative humidity is July (39%).

Average rainfall in December
Westley, CA

Average rainfall in December - Westley, CA
  • Average rainfall in December: 0.47"

The wettest months (with the highest rainfall) are March and December (0.47").
The driest months (with the least rainfall) are June and August (0.04").

Average rainfall days in December
Westley, CA

Average rainfall days in December - Westley, CA
  • Average rainfall days in December: 6.9 days

The month with the highest number of rainy days is March (8.5 days).
The month with the least rainy days is June (1 days).

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

Average daylight in December / Average sunshine in December - Westley, CA
  • Average daylight in December: 9h and 4min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in December: 6h and 0min

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

Average sunshine days in December
Westley, CA

Average sunshine days in December - Westley, CA
  • Average sunshine days in December: 22.8 days

The month with the most sunshine days is August (28.9 days).
The month with the least sunshine days is March (20.9 days).

Average UV index in December
Westley, CA

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

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

Average cloud cover in December
Westley, CA

Average cloud cover in December - Westley, CA
  • Average cloud cover in December: 33

The month with the most cloud cover is March (Cloud cover 34).
The month with the least cloud cover is July (Cloud cover 4).

Average visibility in December
Westley, CA

Average visibility in December - Westley, 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).

Westley, California, USA

Weather forecast for your location

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