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
Sunnyvale records a mild change in average high-temperature during December, easing from a refreshing 64°F (17.8°C) in November to a moderate 55.8°F (13.2°C). The temperature in Sunnyvale, Texas, lowers to an average of 41.7°F (5.4°C) during December nights.Humidity
The average relative humidity in December is 70%.Rainfall
In Sunnyvale, in December, during 10.2 rainfall days, 2.28" (58mm) of precipitation is typically accumulated. In Sunnyvale, during the entire year, the rain falls for 149.6 days and collects up to 33.35" (847mm) of precipitation.Snowfall
In Sunnyvale, snow does not fall in March through December.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 7:11 am and sunset at 5:19 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 5:30 pm CST.
Sunshine
December has the least sunshine of the year in Sunnyvale, Texas, with an average of 5.5h of sunshine.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: A maximum UV index of 3 in December translates into the following recommendations:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Frequently asked questions
What are December temperatures in Sunnyvale?
What is the average humidity in December in Sunnyvale?
How much does it rain in Sunnyvale in December?
When it does not snow in Sunnyvale?
Does it snow in Sunnyvale in December?
What is the month with the shortest days in Sunnyvale?
What is the average length of the day in December in Sunnyvale?
What time are sunrise and sunset in December in Sunnyvale?
What is the month with the least sunshine in Sunnyvale?
How long on average sun shines in December in Sunnyvale?
What are the months with the lowest UV index in Sunnyvale?
What is the UV index reading in December in Sunnyvale?
Average temperature in December
Sunnyvale, TX
- Average high temperature in December: 55.8°F
The warmest month (with the highest average high temperature) is August (95.5°F).
The month with the lowest average high temperature is January (54.3°F).
- Average low temperature in December: 41.7°F
The months with the highest average low temperature are July and August (75.7°F).
The coldest month (with the lowest average low temperature) is January (38.8°F).
Average pressure in December
Sunnyvale, TX
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Sunnyvale, TX
- Average wind speed in December: 8.4mph
The windiest month (with the highest average wind speed) is March (9.8mph).
The calmest month (with the lowest average wind speed) is September (6.6mph).
Average humidity in December
Sunnyvale, TX
- Average humidity in December: 70%
The month with the highest relative humidity is May (75%).
The month with the lowest relative humidity is August (58%).
Average rainfall in December
Sunnyvale, TX
- Average rainfall in December: 2.28"
The wettest month (with the highest rainfall) is October (4.29").
The driest month (with the least rainfall) is February (1.85").
Average rainfall days in December
Sunnyvale, TX
- Average rainfall days in December: 10.2 days
The month with the highest number of rainy days is May (15.4 days).
The month with the least rainy days is January (7.6 days).
Average snowfall in December
Sunnyvale, TX
- Average snowfall in December: 0"
The month with the highest snowfall is February (0.67").
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in December
Sunnyvale, TX
- Average snowfall days in December: 0.2 days
The month with the highest number of snowfall days is February (1.2 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average daylight in December /
Average sunshine in December
Sunnyvale, TX
- Average daylight in December: 10h and 0min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in December: 5h and 3min
The month with the most sunshine is August (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in December
Sunnyvale, TX
- Average sunshine days in December: 19 days
The month with the most sunshine days is January (21.8 days).
The month with the least sunshine days is September (13 days).
Average UV index in December
Sunnyvale, TX
- Average UV index in December: 3
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 3).
Average cloud cover in December
Sunnyvale, TX
- Average cloud cover in December: 38
The month with the most cloud cover is February (Cloud cover 42).
The month with the least cloud cover is August (Cloud cover 20).
Average visibility in December
Sunnyvale, TX
- 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).
Sunnyvale, Texas, USA
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