December weather forecastSignal Hill, CA
December
Weather in December
The first month of the winter, December, is still a refreshing month in Signal Hill, California, with an average temperature fluctuating between 63.5°F (17.5°C) and 52.7°F (11.5°C).Temperature
December, on average, is the coldest month, registering a high temperature of 63.5°F (17.5°C) and a low of 52.7°F (11.5°C).Humidity
In Signal Hill, the average relative humidity in December is 58%.Rainfall
The month with the most rainfall is December, when the rain falls for 5.1 days and typically aggregates up to 1.14" (29mm) of precipitation.Daylight
The month with the shortest days is December, with an average of 10h and 0min of daylight.On the first day of the month, sunrise is at 6:40 am and sunset at 4:43 pm. On the last day of December, sunrise is at 6:57 am and sunset at 4:54 pm PST.
Sunshine
January, February and December, with an average of 6.8h of sunshine, are months with the least sunshine.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: During December, 4 as the daily maximum UV index converts into the following advice:
Act with care - The suggestion to avoid sunburn is emphasized. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Signal Hill, CA
- Average high temperature in December: 63.5°F
The warmest month (with the highest average high temperature) is August (79.5°F).
The month with the lowest average high temperature is December (63.5°F).
- Average low temperature in December: 52.7°F
The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is February (52°F).
Average pressure in December
Signal Hill, CA
- Average pressure in December: 30.07"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are June and September (29.89"Hg).
Average wind speed in December
Signal Hill, CA
- Average wind speed in December: 5.5mph
The windiest month (with the highest average wind speed) is April (6.5mph).
The calmest months (with the lowest average wind speed) are September and October (5mph).
Average humidity in December
Signal Hill, CA
- Average humidity in December: 58%
The month with the highest relative humidity is June (71%).
The month with the lowest relative humidity is November (55%).
Average rainfall in December
Signal Hill, CA
- Average rainfall in December: 1.14"
The wettest month (with the highest rainfall) is December (1.14").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in December
Signal Hill, CA
- Average rainfall days in December: 5.1 days
The month with the highest number of rainy days is March (6 days).
The month with the least rainy days is June (1.8 days).
Average daylight in December /
Average sunshine in December
Signal Hill, 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 48min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 48min).
Average sunshine days in December
Signal Hill, CA
- Average sunshine days in December: 24.5 days
The month with the most sunshine days is January (25.7 days).
The month with the least sunshine days is June (20.8 days).
Average UV index in December
Signal Hill, CA
- Average UV index in December: 4
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 4).
Average cloud cover in December
Signal Hill, CA
- Average cloud cover in December: 22
The months with the most cloud cover are March and December (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 7).
Average visibility in December
Signal Hill, 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).
