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 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 stands out as Bryn Mawr's coldest month, with temperatures ranging between an average high of 58.8°F (14.9°C) and a low of 41.4°F (5.2°C).Humidity
In December, the average relative humidity is 51%.Rainfall
December is the month with the most rainfall. Rain falls for 6.4 days and accumulates 1.42" (36mm) of precipitation.Snowfall
In Bryn Mawr, snow does not fall in January, March through December.Daylight
December has the shortest days of the year, with an average of 9h and 54min of daylight.On the first day of December, sunrise is at 6:36 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 6:54 am and sunset at 4:50 pm PST.
Sunshine
December has the least sunshine of the year in Bryn Mawr, with an average of 6.8h of sunshine.UV index
The month with the lowest UV index is December, with an average maximum UV index of 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for average individuals.Note: A maximum high UV index of 3 in December translates into the following recommendations:
Be vigilant - Preventing sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Frequently asked questions
What time of the year is the coldest in Bryn Mawr?
What is the temperature in December in Bryn Mawr?
What is the average humidity in December in Bryn Mawr?
What is the wettest month in Bryn Mawr?
How much does it rain in Bryn Mawr in December?
When it does not snow in Bryn Mawr?
What is the month with the shortest days in Bryn Mawr?
What is the average length of the day in December in Bryn Mawr?
What time are sunrise and sunset in December in Bryn Mawr?
What is the month with the least sunshine in Bryn Mawr?
How many hours of sunshine does Bryn Mawr have in December?
What is the month with the lowest UV index in Bryn Mawr?
How high is the UV index in December in Bryn Mawr?
Average temperature in December
Bryn Mawr, CA
- Average high temperature in December: 58.8°F
The warmest months (with the highest average high temperature) are July and August (90.3°F).
The month with the lowest average high temperature is December (58.8°F).
- Average low temperature in December: 41.4°F
The month with the highest average low temperature is August (64.2°F).
The coldest month (with the lowest average low temperature) is December (41.4°F).
Average pressure in December
Bryn Mawr, 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 (29.84"Hg).
Average wind speed in December
Bryn Mawr, CA
- Average wind speed in December: 5.4mph
The windiest month (with the highest average wind speed) is April (6.3mph).
The calmest month (with the lowest average wind speed) is September (4.7mph).
Average humidity in December
Bryn Mawr, CA
- Average humidity in December: 51%
The month with the highest relative humidity is February (53%).
The month with the lowest relative humidity is August (37%).
Average rainfall in December
Bryn Mawr, CA
- Average rainfall in December: 1.42"
The wettest month (with the highest rainfall) is December (1.42").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in December
Bryn Mawr, CA
- Average rainfall days in December: 6.4 days
The month with the highest number of rainy days is March (6.7 days).
The month with the least rainy days is June (1.3 days).
Average snowfall days in December
Bryn Mawr, CA
- Average snowfall days in December: 0 days
The month with the highest number of snowfall days is February (0.1 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
Bryn Mawr, 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 12min).
The month with the least sunshine is December (Average sunshine: 6h and 48min).
Average sunshine days in December
Bryn Mawr, CA
- Average sunshine days in December: 23.5 days
The month with the most sunshine days is June (28 days).
The month with the least sunshine days is February (21.3 days).
Average UV index in December
Bryn Mawr, 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
Bryn Mawr, CA
- Average cloud cover in December: 22
The months with the most cloud cover are February, March and December (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in December
Bryn Mawr, 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).
Bryn Mawr, California, USA
Weather forecast for your location
2. Allow the app to use your location
