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 snowfall in December
- Average snowfall 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
Weather in December
Temperature
December, on average, is the coldest month, registering a high temperature of 61°F (16.1°C) and a low of 43°F (6.1°C).Humidity
In December, the average relative humidity is 56%.Rainfall
December is the month with the most rainfall. Rain falls for 6.5 days and accumulates 1.38" (35mm) of precipitation.Snowfall
January, March through December are months without snowfall.Daylight
The month with the shortest days is December, with an average of 10h and 0min of daylight.On the first day of December, sunrise is at 6:35 am and sunset at 4:40 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 4:50 pm PST.
Sunshine
The month with the least sunshine is December, with an average of 6.7h of sunshine.UV index
The month with the lowest UV index is December, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: The UV index of 3 during December leads to these advisories:
Undertake protective steps - Preventing sun damage is advised. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Experience reduced UV exposure by about half when donning a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the coldest?
What is the average December temperature?
What is the average humidity in December?
What is the rainiest month?
How many days does it rain in December?
When it does not snow?
What is the month with the shortest days?
How many hours of daylight does Romoland have in December?
What time are sunrise and sunset in December?
What is the month with the least sunshine?
How long on average sun shines in December?
What is the month with the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Romoland, CA
- Average high temperature in December: 61°F
The warmest month (with the highest average high temperature) is August (89.6°F).
The month with the lowest average high temperature is December (61°F).
- Average low temperature in December: 43°F
The month with the highest average low temperature is August (63.3°F).
The coldest month (with the lowest average low temperature) is December (43°F).
Average pressure in December
Romoland, CA
- Average pressure in December: 30.07"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in December
Romoland, CA
- Average wind speed in December: 4.8mph
The windiest month (with the highest average wind speed) is April (5.5mph).
The calmest months (with the lowest average wind speed) are August and September (4.2mph).
Average humidity in December
Romoland, CA
- Average humidity in December: 56%
The month with the highest relative humidity is May (60%).
The month with the lowest relative humidity is August (47%).
Average rainfall in December
Romoland, CA
- Average rainfall in December: 1.38"
The wettest month (with the highest rainfall) is December (1.38").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in December
Romoland, CA
- Average rainfall days in December: 6.5 days
The month with the highest number of rainy days is March (7.2 days).
The month with the least rainy days is June (1.3 days).
Average snowfall in December
Romoland, CA
- Average snowfall in December: 0"
The month with the highest snowfall is February (0.04").
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in December
Romoland, CA
- Average snowfall days in December: 0 days
The month with the highest number of snowfall days is February (0.2 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in December /
Average sunshine in December
Romoland, CA
- Average daylight in December: 10h and 0min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in December: 6h and 4min
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 42min).
Average sunshine days in December
Romoland, CA
- Average sunshine days in December: 23.5 days
The month with the most sunshine days is June (26.9 days).
The month with the least sunshine days is February (21.6 days).
Average UV index in December
Romoland, CA
- Average UV index in December: 3
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in December
Romoland, CA
- Average cloud cover in December: 24
The months with the most cloud cover are March and December (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in December
Romoland, 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).
Romoland, California, USA
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