December weather forecast
Grimes, CA

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Weather in December

The first month of the winter, December, is also a fresh month in Grimes, California, with an average temperature varying between 54.5°F (12.5°C) and 41.4°F (5.2°C).

Temperature

December is the coldest month, with the temperature often reaching an average high of 54.5°F (12.5°C) and an average low of 41.4°F (5.2°C).

Humidity

In Grimes, the average relative humidity in December is 69%.

Rainfall

In December, in Grimes, the rain falls for 11.1 days. Throughout December, 3.03" (77mm) of precipitation is accumulated. Throughout the year, in Grimes, there are 75.1 rainfall days, and 17.09" (434mm) of precipitation is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 30min of daylight.
On the first day of the month, sunrise is at 7:08 am and sunset at 4:45 pm. On the last day of December, sunrise is at 7:26 am and sunset at 4:55 pm PST.

Sunshine

The month with the least sunshine is December, with an average of 5.8h of sunshine.

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 reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: The average daily UV index of 3 in December transforms into the following instructions:
Take measures. Individuals with light skin might experience burns in under 30 minutes. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
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Frequently asked questions

What month is the coldest in Grimes?

The month of December, characterized by an average high of 54.5°F (12.5°C) and a low of 41.4°F (5.2°C), is recognized as the coldest in Grimes, California.

What is the average December temperature in Grimes?

December temperatures vary between a high-temperature of 54.5°F (12.5°C) and a low-temperature of 41.4°F (5.2°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which represents the influence of relative humidity on air temperature, in June is computed to be 91.4°F (33°C).

What is the average humidity in December in Grimes?

In December, the average relative humidity in Grimes is 69%.

How much does it rain in Grimes in December?

In December, in Grimes, the rain falls for 11.1 days. Throughout December, 3.03" (77mm) of precipitation is accumulated.

What is the month with the shortest days in Grimes?

With an average of 9h and 30min of daylight, December has the shortest days of the year.

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

In December, the average day length in Grimes is 9h and 29min.

What time are sunrise and sunset in December in Grimes?

On the first day of December, sunrise is at 7:08 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 4:55 pm PST.

What is the month with the least sunshine in Grimes?

December has the least sunshine of the year in Grimes, with an average of 5.8h of sunshine.

How long on average sun shines in December in Grimes?

The average sunshine duration in December in Grimes is 5.8h.

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

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

What is the UV index reading in December in Grimes?

In Grimes, the average daily maximum UV index in December is 3. A UV Index of 3 to 5 symbolizes a moderate vulnerability 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
Grimes, CA

Average temperature in December - Grimes, CA
  • Average high temperature in December: 54.5°F

The warmest month (with the highest average high temperature) is July (97.2°F).
The month with the lowest average high temperature is December (54.5°F).

  • Average low temperature in December: 41.4°F

The month with the highest average low temperature is July (62.1°F).
The coldest month (with the lowest average low temperature) is December (41.4°F).

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Average pressure in December
Grimes, CA

Average pressure in December - Grimes, CA
  • Average pressure in December: 30.13"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

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Average wind speed in December
Grimes, CA

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

The windiest month (with the highest average wind speed) is March (6.1mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).

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Average humidity in December
Grimes, CA

Average humidity in December - Grimes, CA
  • Average humidity in December: 69%

The month with the highest relative humidity is March (73%).
The months with the lowest relative humidity are July and September (38%).

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Average rainfall in December
Grimes, CA

Average rainfall in December - Grimes, CA
  • Average rainfall in December: 3.03"

The wettest month (with the highest rainfall) is February (3.07").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in December
Grimes, CA

Average rainfall days in December - Grimes, CA
  • Average rainfall days in December: 11.1 days

The month with the highest number of rainy days is March (13.8 days).
The month with the least rainy days is July (0.9 days).

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

Average daylight in December / Average sunshine in December - Grimes, CA
  • Average daylight in December: 9h and 3min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in December: 5h and 5min

The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).

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Average sunshine days in December
Grimes, CA

Average sunshine days in December - Grimes, CA
  • Average sunshine days in December: 19.3 days

The month with the most sunshine days is July (29.7 days).
The month with the least sunshine days is March (16.2 days).

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Average UV index in December
Grimes, CA

Average UV index in December - Grimes, 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).

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Average cloud cover in December
Grimes, CA

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

The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 4).

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Average visibility in December
Grimes, CA

Average visibility in December - Grimes, 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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Grimes, California, USA

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