Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
December
Weather in December
Temperature
In Harmony, December is the coldest month, with temperatures averaging a high of 59.4°F (15.2°C) and a low of 48.2°F (9°C).Humidity
The average relative humidity in December is 67%.Rainfall
The wettest months are March and December, with an average 1.3" (33mm) of rainfall.Daylight
The month with the shortest days is December, with an average of 9h and 48min of daylight.On the first day of December, sunrise is at 6:55 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 5:01 pm PST.
Sunshine
With an average of 6.3h of sunshine, December has the least sunshine of the year in Harmony.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: In December, the maximum UV index of 4 suggests these recommendations:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. To protect against the Sun's most potent rays, avoid direct exposure around midday. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year?
What are December temperatures in Harmony?
What is the average humidity in December?
What is the wettest month?
How many days does it rain in December?
What is the month with the shortest days?
What is the average length of the day in December?
What time are sunrise and sunset in December?
What is the month with the least sunshine?
How many hours of sunshine does Harmony have in December?
When is the lowest UV index?
How high is the UV index in December?
Average temperature in December
Harmony, CA
- Average high temperature in December: 59.4°F
The warmest month (with the highest average high temperature) is September (75.4°F).
The month with the lowest average high temperature is December (59.4°F).
- Average low temperature in December: 48.2°F
The month with the highest average low temperature is September (59.9°F).
The coldest month (with the lowest average low temperature) is February (47.8°F).
Average pressure in December
Harmony, CA
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is September (29.91"Hg).
Average wind speed in December
Harmony, CA
- Average wind speed in December: 6.9mph
The windiest month (with the highest average wind speed) is May (8.6mph).
The calmest months (with the lowest average wind speed) are July, August, September, October and November (6.5mph).
Average humidity in December
Harmony, CA
- Average humidity in December: 67%
The month with the highest relative humidity is March (71%).
The month with the lowest relative humidity is October (61%).
Average rainfall in December
Harmony, CA
- Average rainfall in December: 1.3"
The wettest months (with the highest rainfall) are March and December (1.3").
The driest months (with the least rainfall) are June and August (0.04").
Average rainfall days in December
Harmony, CA
- Average rainfall days in December: 6.5 days
The month with the highest number of rainy days is March (8.5 days).
The month with the least rainy days is August (0.8 days).
Average daylight in December /
Average sunshine in December
Harmony, CA
- Average daylight in December: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in December: 6h and 2min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 18min).
Average sunshine days in December
Harmony, CA
- Average sunshine days in December: 23.8 days
The month with the most sunshine days is August (29.3 days).
The month with the least sunshine days is February (21.2 days).
Average UV index in December
Harmony, CA
- Average UV index in December: 4
The month with the highest UV index is August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).
Average cloud cover in December
Harmony, CA
- Average cloud cover in December: 27
The month with the most cloud cover is March (Cloud cover 28).
The months with the least cloud cover are July, August and September (Cloud cover 8).
Average visibility in December
Harmony, 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).