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
In Rosemont, the month of December registers the lowest temperatures, averaging 54.3°F (12.4°C) at the peak and 40.8°F (4.9°C) at the lowest.Humidity
The average relative humidity in December in Rosemont is 71%.Rainfall
In Rosemont, during December, the rain falls for 10.3 days and regularly aggregates up to 2.6" (66mm) of precipitation. In Rosemont, during the entire year, the rain falls for 70.5 days and collects up to 15.04" (382mm) 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 December, sunrise is at 7:04 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:54 pm PST.
Sunshine
The month with the least sunshine in Rosemont is December, with an average of 5.8h of sunshine.UV index
The months with the lowest UV index in Rosemont, California, are January, February, November and December, with an average maximum UV index of 3. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the average person.Note: In December, an average UV index of 3 transforms into the following instructions:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What month is the coldest in Rosemont?
What is the usual temperature for Rosemont in December?
What is the average humidity in December in Rosemont?
How many days does it rain in December in Rosemont?
What is the month with the shortest days in Rosemont?
How many hours of daylight does Rosemont have in December?
When are sunrise and sunset in December in Rosemont?
What is the month with the least sunshine in Rosemont?
How many hours of sunshine does Rosemont have in December?
What is the month with the lowest UV index in Rosemont?
What is the UV index intensity in December in Rosemont?
Average temperature in December
Rosemont, CA
- Average high temperature in December: 54.3°F
The warmest month (with the highest average high temperature) is July (94.5°F).
The month with the lowest average high temperature is December (54.3°F).
- Average low temperature in December: 40.8°F
The month with the highest average low temperature is August (59.9°F).
The coldest months (with the lowest average low temperature) are January and December (40.8°F).
Average pressure in December
Rosemont, CA
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Rosemont, CA
- Average wind speed in December: 5mph
The windiest month (with the highest average wind speed) is February (5.7mph).
The calmest month (with the lowest average wind speed) is September (4.1mph).
Average humidity in December
Rosemont, CA
- Average humidity in December: 71%
The month with the highest relative humidity is March (75%).
The months with the lowest relative humidity are July and September (44%).
Average rainfall in December
Rosemont, CA
- Average rainfall in December: 2.6"
The wettest month (with the highest rainfall) is March (2.72").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in December
Rosemont, CA
- Average rainfall days in December: 10.3 days
The month with the highest number of rainy days is March (12.6 days).
The month with the least rainy days is July (1 days).
Average daylight in December /
Average sunshine in December
Rosemont, CA
- Average daylight in December: 9h and 3min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in December: 5h and 5min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in December
Rosemont, CA
- Average sunshine days in December: 20.1 days
The month with the most sunshine days is July (29.7 days).
The month with the least sunshine days is March (17.6 days).
Average UV index in December
Rosemont, 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
Rosemont, CA
- Average cloud cover in December: 36
The month with the most cloud cover is March (Cloud cover 38).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in December
Rosemont, 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).
Rosemont, California, USA
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