December weather forecast and climate
Modesto, CA

Weather in December

The first month of the winter, December, is also a moderate month in Modesto, California, with temperature in the range of an average high of 55.6°F (13.1°C) and an average low of 41.9°F (5.5°C).

Temperature

The coldest month is December, with an average high-temperature of 55.6°F (13.1°C) and an average low-temperature of 41.9°F (5.5°C).

Humidity

The average relative humidity in December is 70%.

Rainfall

In December, the rain falls for 8.2 days. Throughout December, 1.22" (31mm) of precipitation is accumulated. In Modesto, during the entire year, the rain falls for 54.3 days and collects up to 6.54" (166mm) of precipitation.

Daylight

December has the shortest days of the year in Modesto, with an average of 9.6h of daylight.

Sunshine

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

UV index

Months with the lowest UV index in Modesto are January, February, November and December, with an average maximum UV index of 3. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In December, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the coldest month in Modesto?

With an average high-temperature of 55.6°F (13.1°C) and an average low-temperature of 41.9°F (5.5°C), December is the coldest month in Modesto.

What is the temperature in December in Modesto?

In Modesto, California, in December, the average high-temperature is 55.6°F (13.1°C), and the average low-temperature is 41.9°F (5.5°C).

What is the average humidity in December in Modesto?

In Modesto, the average relative humidity in December is 70%.

How much does it rain in Modesto in December?

In December, in Modesto, California, the rain falls for 8.2 days. Throughout December, 1.22" (31mm) of precipitation is accumulated.

What is the month with the shortest days in Modesto?

December has the shortest days of the year in Modesto, California, with an average of 9.6h of daylight.

What is the average length of the day in December in Modesto?

In December, the average length of the day in Modesto, California, is 9.6h.

What is the month with the least sunshine in Modesto?

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

How long on average sun shines in December in Modesto?

The average sunshine in December is 6h.

What is the month with the lowest UV index in Modesto?

Months with the lowest UV index in Modesto, California, are January, February, November and December, with an average maximum UV index of 3.

How high is the UV index in December in Modesto?

The average daily maximum UV index in December is 3. A UV Index estimate of 3 to 5 represents a moderate vulnerability from the exposure to the Sun's UV rays.

Average temperature in December
Modesto, CA

Average temperature in December - Modesto, CA
  • Average high temperature in December: 55.6°F

The warmest month (with the highest average high temperature) is July (97.7°F).
The month with the lowest average high temperature is December (55.6°F).

  • Average low temperature in December: 41.9°F

The month with the highest average low temperature is July (62.1°F).
The coldest months (with the lowest average low temperature) are January and December (41.9°F).

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Average pressure in December
Modesto, CA

Average pressure in December - Modesto, CA
  • Average pressure in December: 30.12"

The month with the highest atmospheric pressure is January (30.15").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in December
Modesto, CA

Average wind speed in December - Modesto, CA
  • Average wind speed in December: 5.7mph

The windiest month (with the highest average wind speed) is June (7.3mph).
The calmest month (with the lowest average wind speed) is November (5.2mph).

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Average humidity in December
Modesto, CA

Average humidity in December - Modesto, CA
  • Average humidity in December: 70%

The month with the highest relative humidity is January (72%).
The month with the lowest relative humidity is July (37%).

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Average rainfall in December
Modesto, CA

Average rainfall in December - Modesto, CA
  • Average rainfall in December: 1.22"

The wettest month (with the highest rainfall) is March (1.3").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in December
Modesto, CA

Average rainfall days in December - Modesto, CA
  • Average rainfall days in December: 8.2 days

The month with the highest number of rainy days is March (10.3 days).
The month with the least rainy days is August (0.9 days).

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

Average daylight in December / Average sunshine in December - Modesto, CA
  • Average daylight in December: 9.6h

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in December: 6h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6h).

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Average sunshine days in December
Modesto, CA

Average sunshine days in December - Modesto, CA
  • Average sunshine days in December: 22 days

The month with the most sunshine days is August (29.2 days).
The month with the least sunshine days is March (19.6 days).

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Average UV index in December
Modesto, CA

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

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

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Average cloud cover in December
Modesto, CA

Average cloud cover in December - Modesto, CA
  • Average cloud cover in December: 32

The month with the most cloud cover is March (Cloud cover 33).
The month with the least cloud cover is July (Cloud cover 4).

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Average visibility in December
Modesto, CA

Average visibility in December - Modesto, CA
  • Average visibility in December: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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