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
Weather in December
Temperature
The coldest period tends to be December, when average temperatures fluctuate between a high of 64.9°F (18.3°C) and a low of 49.5°F (9.7°C).Humidity
In Rowland Heights, California, the average relative humidity in December is 51%.Rainfall
The month with the most rainfall in Rowland Heights is December, when the rain falls for 6 days and typically aggregates up to 1.61" (41mm) of precipitation.Daylight
December has the shortest days of the year, with an average of 9h and 54min of daylight.On the first day of the month, sunrise is at 6:39 am and sunset at 4:42 pm. On the last day of December, in Rowland Heights, sunrise is at 6:56 am and sunset at 4:53 pm PST.
Sunshine
The months with the least sunshine are February and December, with an average of 6.8h of sunshine.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: A daily maximum UV index of 4 in December translates into the following instructions:
Guard yourself - Avoiding sunburn is suggested. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Frequently asked questions
What are the coldest months in Rowland Heights?
What is the temperature in December in Rowland Heights?
What is the average humidity in December in Rowland Heights?
What is the rainiest month in Rowland Heights?
How much does it rain in Rowland Heights in December?
What is the month with the shortest days in Rowland Heights?
How many hours of daylight does Rowland Heights have in December?
When is the sunrise / sunset in December in Rowland Heights?
What is the month with the least sunshine in Rowland Heights?
How many hours of sunshine does Rowland Heights have in December?
What is the month with the lowest UV index in Rowland Heights?
What is the UV index intensity in December in Rowland Heights?
Average temperature in December
Rowland Heights, CA
- Average high temperature in December: 64.9°F
The warmest month (with the highest average high temperature) is August (88.3°F).
The month with the lowest average high temperature is December (64.9°F).
- Average low temperature in December: 49.5°F
The month with the highest average low temperature is August (66.2°F).
The coldest month (with the lowest average low temperature) is February (48.9°F).
Average pressure in December
Rowland Heights, 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 (29.88"Hg).
Average wind speed in December
Rowland Heights, CA
- Average wind speed in December: 5.2mph
The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest month (with the lowest average wind speed) is September (4.6mph).
Average humidity in December
Rowland Heights, CA
- Average humidity in December: 51%
The month with the highest relative humidity is June (59%).
The month with the lowest relative humidity is November (46%).
Average rainfall in December
Rowland Heights, CA
- Average rainfall in December: 1.61"
The wettest month (with the highest rainfall) is December (1.61").
The driest months (with the least rainfall) are June and August (0.04").
Average rainfall days in December
Rowland Heights, CA
- Average rainfall days in December: 6 days
The month with the highest number of rainy days is March (6.6 days).
The month with the least rainy days is June (1.1 days).
Average daylight in December /
Average sunshine in December
Rowland Heights, CA
- Average daylight in December: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in December: 6h and 5min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are February and December (Average sunshine: 6h and 48min).
Average sunshine days in December
Rowland Heights, CA
- Average sunshine days in December: 24 days
The month with the most sunshine days is August (28.2 days).
The month with the least sunshine days is February (21.6 days).
Average UV index in December
Rowland Heights, CA
- Average UV index in December: 4
The month with the highest UV index is August (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 4).
Average cloud cover in December
Rowland Heights, 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 5).
Average visibility in December
Rowland Heights, 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).
Rowland Heights, California, USA
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