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
Rock Island observes a small decrease in the average high-temperature with the arrival of December, falling from November's agreeable 69.3°F (20.7°C) to a refreshing 61.7°F (16.5°C). During December, Rock Island records an average temperature of 47.3°F (8.5°C) at night.Humidity
In Rock Island, the average relative humidity in December is 76%.Rainfall
In December, in Rock Island, the rain falls for 11.4 days. Throughout December, 2.17" (55mm) of precipitation is accumulated. Throughout the year, there are 163.7 rainfall days, and 29.37" (746mm) of precipitation is accumulated.Snowfall
Months with snowfall in Rock Island are January, February and December. The months with the most snowfall are January and December, with an average 0.12" (3mm) of accumulated snow.Daylight
With an average of 10h and 18min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:04 am and sunset at 5:27 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 5:38 pm CST.
Sunshine
December has the least sunshine of the year in Rock Island, with an average of 4.8h of sunshine.UV index
December is the month with the lowest UV index, with an average maximum UV index of 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.Note: The UV index of 3 during December translates into the following guidance:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. Around midday, solar radiation is most harmful; hence, exposure should be limited. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Frequently asked questions
What is the temperature in December in Rock Island?
What is the average humidity in December in Rock Island?
How much does it rain in Rock Island in December?
What is the snowiest month in Rock Island?
When does it start to snow in Rock Island?
What is the month with the shortest days in Rock Island?
What is the average length of the day in December in Rock Island?
What time are sunrise and sunset in December in Rock Island?
What is the month with the least sunshine in Rock Island?
How many hours of sunshine does Rock Island have in December?
When is the lowest UV index in Rock Island?
What is the UV index intensity in December in Rock Island?
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
Weather forecast for your location
2. Allow the app to use your location
