Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
January is Sunnyvale's coldest month, registering average high temperatures of 54.3°F (12.4°C) and lows of 38.8°F (3.8°C).Humidity
In Sunnyvale, the average relative humidity in January is 67%.Rainfall
In Sunnyvale, in January, during 7.6 rainfall days, 1.93" (49mm) of precipitation is typically accumulated. Throughout the year, there are 149.6 rainfall days, and 33.35" (847mm) of precipitation is accumulated.Snowfall
January and February are months with snowfall. January is the first month it typically snows. Throughout January, in the average 0.4 snowfall days, it receives 0.2" (5mm) of snow. In Sunnyvale, during the entire year, snow falls for 2 days and aggregates up to 0.87" (22mm) of snow.Daylight
The average length of the day in January is 10h and 17min.On the first day of January in Sunnyvale, sunrise is at 7:28 am and sunset at 5:30 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 5:57 pm CST.
Sunshine
In January, the average sunshine in Sunnyvale is 5.8h.UV index
January and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: A daily high UV index of 3 in January leads to these guidelines:
Take necessary precautions - Suggestions to elude sunburn are provided. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the coldest in Sunnyvale?
What is the average January temperature?
What is the average humidity in January?
How much does it rain in January?
When does it start to snow?
What is the average length of the day in January?
When are sunrise and sunset in January?
How many hours of sunshine does Sunnyvale have in January?
When is the lowest UV index?
What is the UV index intensity in January?
Average temperature in January
Sunnyvale, TX
- Average high temperature in January: 54.3°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 January: 38.8°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 January
Sunnyvale, TX
- Average pressure in January: 30.16"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 January
Sunnyvale, TX
- Average wind speed in January: 8.9mph
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 January
Sunnyvale, TX
- Average humidity in January: 67%
The month with the highest relative humidity is May (75%).
The month with the lowest relative humidity is August (58%).
Average rainfall in January
Sunnyvale, TX
- Average rainfall in January: 1.93"
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 January
Sunnyvale, TX
- Average rainfall days in January: 7.6 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 January
Sunnyvale, TX
- Average snowfall in January: 0.2"
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 January
Sunnyvale, TX
- Average snowfall days in January: 0.4 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 January /
Average sunshine in January
Sunnyvale, TX
- Average daylight in January: 10h and 2min
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 January: 5h and 5min
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 January
Sunnyvale, TX
- Average sunshine days in January: 21.8 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 January
Sunnyvale, TX
- Average UV index in January: 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 January
Sunnyvale, TX
- Average cloud cover in January: 32
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 January
Sunnyvale, TX
- Average visibility in January: 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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