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
The onset of December is marked by a decrease in temperature, transitioning from a cool 50.4°F (10.2°C) in November to an icy 38.5°F (3.6°C). Callao observes an average nighttime low-temperature of 26.1°F (-3.3°C) during the month of December.Humidity
The average relative humidity in December in Callao, Missouri, is 78%.Rainfall
In Callao, during December, the rain falls for 6.2 days and regularly aggregates up to 1.3" (33mm) of precipitation. Throughout the year, in Callao, there are 134.7 rainfall days, and 26.38" (670mm) of precipitation is accumulated.Snowfall
Months with snowfall in Callao are January through April, October through December. In Callao, during December, snow falls for 4 days and regularly aggregates up to 1.57" (40mm) of snow. Throughout the year, there are 21.8 snowfall days, and 11.14" (283mm) of snow is accumulated.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year in Callao.On the first day of the month, sunrise is at 7:13 am and sunset at 4:46 pm. On the last day of December, in Callao, sunrise is at 7:31 am and sunset at 4:56 pm CST.
Sunshine
In December, the average sunshine in Callao is 4.8h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Callao, Missouri. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for the average person.Note: A maximum daily UV index of 2 during December morphs into the following directions:
Protection from prolonged sun exposure is necessary for babies, children, and individuals with sensitive skin. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
Frequently asked questions
How cold does it get in Callao in December?
What is the average humidity in December in Callao?
How many days does it rain in December in Callao?
How many days does it snow in December in Callao?
What is the month with the shortest days in Callao?
How many hours of daylight does Callao have in December?
When is the sunrise / sunset in December in Callao?
How long on average sun shines in December in Callao?
When is the lowest UV index in Callao?
What is the UV index reading in December in Callao?
Average temperature in December
Callao, MO
- Average high temperature in December: 38.5°F
The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (33.3°F).
- Average low temperature in December: 26.1°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (20.1°F).
Average pressure in December
Callao, MO
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Callao, MO
- Average wind speed in December: 9.9mph
The windiest month (with the highest average wind speed) is February (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).
Average humidity in December
Callao, MO
- Average humidity in December: 78%
The months with the highest relative humidity are May and June (81%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Callao, MO
- Average rainfall in December: 1.3"
The wettest month (with the highest rainfall) is May (3.23").
The driest month (with the least rainfall) is January (1.1").
Average rainfall days in December
Callao, MO
- Average rainfall days in December: 6.2 days
The month with the highest number of rainy days is May (17.6 days).
The month with the least rainy days is January (5.3 days).
Average snowfall in December
Callao, MO
- Average snowfall in December: 1.57"
The month with the highest snowfall is January (3.86").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Callao, MO
- Average snowfall days in December: 4 days
The month with the highest number of snowfall days is January (6.7 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Callao, MO
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in December
Callao, MO
- Average sunshine days in December: 21.3 days
The month with the most sunshine days is December (21.3 days).
The month with the least sunshine days is May (11.8 days).
Average UV index in December
Callao, MO
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Callao, MO
- Average cloud cover in December: 47
The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in December
Callao, MO
- 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).
Callao, Missouri, USA
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