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
December marks a gentle change in average high-temperature, declining from November's pleasant 70.2°F (21.2°C) to a comfortable 62.6°F (17°C). In December, the recorded average low-temperature is a frosty 47.8°F (8.8°C).Humidity
The average relative humidity in December is 77%.Rainfall
In Katy, in December, during 11.9 rainfall days, 2.01" (51mm) of precipitation is typically accumulated. In Katy, during the entire year, the rain falls for 169 days and collects up to 30.12" (765mm) of precipitation.Snowfall
January and December are months with snowfall. December is the month with the most snowfall. Snow falls for 0.2 days and accumulates 0.12" (3mm) of snow.Daylight
December has the shortest days of the year, with an average of 10h and 18min of daylight.On the first day of the month, sunrise is at 7:01 am and sunset at 5:23 pm. On the last day of December, in Katy, sunrise is at 7:18 am and sunset at 5:34 pm CST.
Sunshine
With an average of 4.9h of sunshine, December has the least sunshine of the year.UV index
The month with the lowest UV index is December, with an average maximum UV index of 3. 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 maximum UV index of 3 in December translates into the following recommendations:
Prioritize safety - Suggestions to prevent sun damage are offered. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in December?
What is the average humidity in December?
How many days does it rain in December?
When does it snow the most?
When does it start to snow?
What is the month with the shortest days?
What is the average length of the day in December?
What time are sunrise and sunset in December?
What is the month with the least sunshine?
How many hours of sunshine does Katy have in December?
When is the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Katy, TX
- Average high temperature in December: 62.6°F
The warmest month (with the highest average high temperature) is August (94.6°F).
The month with the lowest average high temperature is January (61°F).
- Average low temperature in December: 47.8°F
The month with the highest average low temperature is August (75.7°F).
The coldest month (with the lowest average low temperature) is January (45°F).
Average pressure in December
Katy, TX
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Katy, TX
- Average wind speed in December: 7.6mph
The windiest month (with the highest average wind speed) is April (8.4mph).
The calmest month (with the lowest average wind speed) is September (5.7mph).
Average humidity in December
Katy, TX
- Average humidity in December: 77%
The months with the highest relative humidity are February and March (78%).
The months with the lowest relative humidity are August and October (71%).
Average rainfall in December
Katy, TX
- Average rainfall in December: 2.01"
The wettest month (with the highest rainfall) is May (4.29").
The driest month (with the least rainfall) is February (1.42").
Average rainfall days in December
Katy, TX
- Average rainfall days in December: 11.9 days
The month with the highest number of rainy days is September (18.8 days).
The month with the least rainy days is January (10.5 days).
Average snowfall in December
Katy, TX
- Average snowfall in December: 0.12"
The month with the highest snowfall is December (0.12").
The months with the least snowfall are February, March, April, May, June, July, August, September, October and November (0").
Average snowfall days in December
Katy, TX
- Average snowfall days in December: 0.2 days
The month with the highest number of snowfall days is January (0.4 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).
Average daylight in December /
Average sunshine in December
Katy, TX
- Average daylight in December: 10h and 2min
The month with the longest days is June (Average daylight: 14h and 0min).
The month with the shortest days is December (Average daylight: 10h and 18min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is December (Average sunshine: 4h and 54min).
Average sunshine days in December
Katy, TX
- Average sunshine days in December: 16.6 days
The month with the most sunshine days is January (18.7 days).
The month with the least sunshine days is September (8.9 days).
Average UV index in December
Katy, TX
- Average UV index in December: 3
The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in December
Katy, TX
- Average cloud cover in December: 48
The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in December
Katy, TX
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, June, August, September, October, November and December (6mi).
The months with the lowest visibility are April, May and July (5mi).
Katy, Texas, USA
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