December weather forecast
Isleton, CA

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Weather in December

The first month of the winter, December, is still a cool month in Isleton, California, with an average temperature fluctuating between 41.7°F (5.4°C) and 55°F (12.8°C).

Temperature

Isleton records the coldest temperatures in December, averaging a high of 55°F (12.8°C) and a low of 41.7°F (5.4°C).

Humidity

In Isleton, the average relative humidity in December is 71%.

Rainfall

In Isleton, California, in December, during 9.7 rainfall days, 1.73" (44mm) of precipitation is typically accumulated. In Isleton, during the entire year, the rain falls for 68.7 days and collects up to 11.18" (284mm) of precipitation.

Daylight

December has the shortest days of the year in Isleton, with an average of 9h and 36min of daylight.
On the first day of the month, sunrise is at 7:04 am and sunset at 4:46 pm. On the last day of December, sunrise is at 7:22 am and sunset at 4:56 pm PST.

Sunshine

The month with the least sunshine is December, with an average of 5.9h of sunshine.

UV index

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Isleton. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.
Note: The maximum daily UV index of 3 in December converts into the following recommendations:
Make use of precautions - Suggestions to resist sunburn are communicated. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
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Frequently asked questions

What part of the year is the coldest in Isleton?

With average high and low temperatures of 55°F (12.8°C) and 41.7°F (5.4°C) respectively, December is Isleton's coldest month.

What is the average December temperature in Isleton?

The average high-temperature and low-temperature during December are 55°F (12.8°C) and 41.7°F (5.4°C) respectively. The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines relative humidity and air temperature, in September is calculated to be 89.6°F (32°C).

What is the average humidity in December in Isleton?

In December, the average relative humidity in Isleton is 71%.

How much does it rain in Isleton in December?

In Isleton, in December, it is raining for 9.7 days, with typically 1.73" (44mm) of accumulated precipitation.

What is the month with the shortest days in Isleton?

With an average of 9h and 36min of daylight, December has the shortest days of the year.

How many hours of daylight does Isleton have in December?

The average day length in December is 9h and 34min.

When are sunrise and sunset in December in Isleton?

In December, on the first day of the month, sunrise is at 7:04 am and sunset at 4:46 pm. On the last day of the month, in Isleton, California, sunrise is at 7:22 am and sunset at 4:56 pm PST.

What is the month with the least sunshine in Isleton?

The month with the least sunshine in Isleton is December, with an average of 5.9h of sunshine.

How long on average sun shines in December in Isleton?

In Isleton, California, the average sunshine duration in December is 5.9h.

When is the lowest UV index in Isleton?

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

How high is the UV index in December in Isleton?

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

Average temperature in December
Isleton, CA

Average temperature in December - Isleton, CA
  • Average high temperature in December: 55°F

The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is December (55°F).

  • Average low temperature in December: 41.7°F

The month with the highest average low temperature is September (58.1°F).
The coldest month (with the lowest average low temperature) is January (41.5°F).

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Average pressure in December
Isleton, CA

Average pressure in December - Isleton, CA
  • Average pressure in December: 30.11"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).

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Average wind speed in December
Isleton, CA

Average wind speed in December - Isleton, CA
  • Average wind speed in December: 5.3mph

The windiest month (with the highest average wind speed) is June (7.6mph).
The calmest month (with the lowest average wind speed) is November (4.7mph).

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Average humidity in December
Isleton, CA

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

The months with the highest relative humidity are January and March (74%).
The month with the lowest relative humidity is September (49%).

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Average rainfall in December
Isleton, CA

Average rainfall in December - Isleton, CA
  • Average rainfall in December: 1.73"

The wettest month (with the highest rainfall) is February (2.17").
The driest month (with the least rainfall) is August (0").

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Average rainfall days in December
Isleton, CA

Average rainfall days in December - Isleton, CA
  • Average rainfall days in December: 9.7 days

The month with the highest number of rainy days is March (13 days).
The month with the least rainy days is August (0.7 days).

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

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

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in December: 5h and 5min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).

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Average sunshine days in December
Isleton, CA

Average sunshine days in December - Isleton, CA
  • Average sunshine days in December: 20.5 days

The month with the most sunshine days is August (29.9 days).
The month with the least sunshine days is March (17.3 days).

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Average UV index in December
Isleton, CA

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

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in December
Isleton, CA

Average cloud cover in December - Isleton, CA
  • Average cloud cover in December: 35

The months with the most cloud cover are March and December (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 4).

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Average visibility in December
Isleton, CA

Average visibility in December - Isleton, 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).

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Isleton, California, USA

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