December weather forecast
Modesto, CA

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Weather in December

December, the first month of the winter in Modesto, is still a mild month, with an average temperature varying between 41.9°F (5.5°C) and 55.6°F (13.1°C).

Temperature

December is the month when Modesto, California, experiences its coldest temperatures, averaging a high of 55.6°F (13.1°C) and a low of 41.9°F (5.5°C).

Humidity

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

Rainfall

In Modesto, in December, it is raining for 8.2 days, with typically 1.22" (31mm) of accumulated precipitation. Throughout the year, there are 54.3 rainfall days, and 6.54" (166mm) of precipitation is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 36min of daylight.
On the first day of the month, sunrise is at 7:00 am and sunset at 4:45 pm. On the last day of December, sunrise is at 7:18 am and sunset at 4:55 pm PST.

Sunshine

The month with the least sunshine in Modesto is December, with an average of 6h of sunshine.

UV index

January, February, 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 moderate health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum daily UV index of 3 during December translates into the following directions:
Put precautions into practice - Ensuring skin and eye safety is a necessity. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.

Frequently asked questions

What are the coldest months in Modesto?

Modesto, California, experiences its lowest temperatures in December, with an average peak of 55.6°F (13.1°C) and a low of 41.9°F (5.5°C).

What is the temperature in December in Modesto?

The high-temperature, in December, in Modesto, records 55.6°F (13.1°C), while the low-temperature is 41.9°F (5.5°C). In September, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which combines air temperature and relative humidity, is calculated to be 93.2°F (34°C).

What is the average humidity in December in Modesto?

The average relative humidity in December in Modesto, California, is 70%.

How many days does it rain in December in Modesto?

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?

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

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

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

What time are sunrise and sunset in December in Modesto?

On the first day of December in Modesto, California, sunrise is at 7:00 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:55 pm PST.

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.

How many hours of sunshine does Modesto have in December?

In Modesto, the average sunshine duration in December is 6h.

What are the months with the lowest UV index in Modesto?

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

What is the UV index reading in December in Modesto?

In December, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a medium health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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).

Average pressure in December
Modesto, CA

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

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

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).

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%).

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").

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).

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

Average daylight in December / Average sunshine in December - Modesto, 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
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).

Average UV index in December
Modesto, CA

Average UV index in December - Modesto, 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 January, February, November and December (UV index 3).

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).

Average visibility in December
Modesto, CA

Average visibility in December - Modesto, 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).

Modesto, California, USA

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