December weather forecastGrimes, CA
December
Weather in December
The first month of the winter, December, is still a cool month in Grimes, California, with an average temperature fluctuating between 41.4°F (5.2°C) and 54.5°F (12.5°C).Temperature
The coldest month is December, with an average high-temperature of 54.5°F (12.5°C) and an average low-temperature of 41.4°F (5.2°C).Humidity
In Grimes, the average relative humidity in December is 69%.Rainfall
In Grimes, in December, it is raining for 11.1 days, with typically 3.03" (77mm) of accumulated precipitation. In Grimes, during the entire year, the rain falls for 75.1 days and collects up to 17.09" (434mm) of precipitation.Daylight
With an average of 9h and 30min of daylight, December has the shortest days of the year.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
With an average of 5.8h of sunshine, December has the least sunshine of the year.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 medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The average daily UV index of 3 in December transforms into the following instructions:
Ensure safety - Recommendations to avert sunburn are presented. Around midday, solar radiation is most harmful; hence, exposure should be limited. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
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).
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).
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%).
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").
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).
Average daylight in December /
Average sunshine in December
Grimes, CA
- Average daylight in December: 9h and 30min
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 48min
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).
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).
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).
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).
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).
