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
During the shift to December, Rock Island records a mild decrease in average high-temperature, moving from an agreeable 69.3°F (20.7°C) in November to a refreshing 61.7°F (16.5°C). During December, the temperature is averaged to a low of 47.3°F (8.5°C) at night.Humidity
The average relative humidity in December is 76%.Rainfall
In Rock Island, in December, during 11.4 rainfall days, 2.17" (55mm) of precipitation is typically accumulated. Throughout the year, there are 163.7 rainfall days, and 29.37" (746mm) of precipitation is accumulated.Snowfall
January, February and December are months with snowfall. The months with the most snowfall are January and December, with an average 0.12" (3mm) of accumulated 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 7:04 am and sunset at 5:27 pm. On the last day of December, sunrise is at 7:20 am and sunset at 5:38 pm CST.
Sunshine
The month with the least sunshine in Rock Island is December, with an average of 4.8h of sunshine.UV index
With an average maximum UV index of 3, December is the month with the lowest UV index. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the average person.Note: The maximum daily UV index of 3 in December converts into the following recommendations:
Undertake precautions - Obligation exists to protect against skin and eye damage. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Always opt for UVA and UVB-resistant sunglasses on radiant days. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Rock Island in December?
What is the average humidity in December?
How much does it rain in December?
When does it snow the most?
When does it start snowing?
What is the month with the shortest days?
How many hours of daylight does Rock Island have in December?
What time are sunrise and sunset in December?
What is the month with the least sunshine?
How long on average sun shines in December?
When is the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Rock Island, TX
- Average high temperature in December: 61.7°F
The warmest month (with the highest average high temperature) is August (95°F).
The month with the lowest average high temperature is January (60.4°F).
- Average low temperature in December: 47.3°F
The month with the highest average low temperature is August (75°F).
The coldest month (with the lowest average low temperature) is January (44.2°F).
Average pressure in December
Rock Island, 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 (29.92"Hg).
Average wind speed in December
Rock Island, TX
- Average wind speed in December: 7.9mph
The windiest month (with the highest average wind speed) is April (8.7mph).
The calmest month (with the lowest average wind speed) is September (5.9mph).
Average humidity in December
Rock Island, TX
- Average humidity in December: 76%
The months with the highest relative humidity are March, May and June (78%).
The month with the lowest relative humidity is August (69%).
Average rainfall in December
Rock Island, TX
- Average rainfall in December: 2.17"
The wettest month (with the highest rainfall) is May (4.17").
The driest month (with the least rainfall) is February (1.34").
Average rainfall days in December
Rock Island, TX
- Average rainfall days in December: 11.4 days
The month with the highest number of rainy days is September (18.3 days).
The month with the least rainy days is January (10.4 days).
Average snowfall in December
Rock Island, TX
- Average snowfall in December: 0.12"
The months with the highest snowfall are January and December (0.12").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").
Average snowfall days in December
Rock Island, TX
- Average snowfall days in December: 0.3 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
Rock Island, 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: 9h and 48min).
The month with the least sunshine is December (Average sunshine: 4h and 48min).
Average sunshine days in December
Rock Island, TX
- Average sunshine days in December: 17.6 days
The month with the most sunshine days is January (19.3 days).
The month with the least sunshine days is September (9.1 days).
Average UV index in December
Rock Island, TX
- Average UV index in December: 3
The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in December
Rock Island, TX
- Average cloud cover in December: 48
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in December
Rock Island, TX
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, August, September, October, November and December (6mi).
The months with the lowest visibility are May, June and July (5mi).
Rock Island, Texas, USA
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