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
A shift in the average high-temperature occurs in December, reducing from a frosty 47.3°F (8.5°C) in November to an icy 34.3°F (1.3°C). In Cromwell, the expected average low-temperature for December is a subzero cold 22.3°F (-5.4°C).Humidity
In December, the average relative humidity is 79%.Rainfall
In Cromwell, in December, during 5 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. Throughout the year, in Cromwell, there are 127.7 rainfall days, and 23.39" (594mm) of precipitation is accumulated.Snowfall
Months with snowfall in Cromwell are January through May, October through December. In Cromwell, during December, snow falls for 6.5 days and regularly aggregates up to 1.69" (43mm) of snow. Throughout the year, there are 32.6 snowfall days, and 12.01" (305mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of December, sunrise is at 7:24 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:42 am and sunset at 4:59 pm CST.
Sunshine
In Cromwell, the average sunshine in December is 4.8h.UV index
The average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for average individuals.Note: An average UV index of 2 in December transforms into this advice:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. To protect against the Sun's most potent rays, avoid direct exposure around midday. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Frequently asked questions
How cold is it in Cromwell in December?
What is the average humidity in December in Cromwell?
How many days does it rain in December in Cromwell?
How many days does it snow in December in Cromwell?
What is the month with the shortest days in Cromwell?
How many hours of daylight does Cromwell have in December?
When are sunrise and sunset in December in Cromwell?
How long on average sun shines in December in Cromwell?
What is the UV index reading in December in Cromwell?
Average temperature in December
Cromwell, IA
- Average high temperature in December: 34.3°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (29.1°F).
- Average low temperature in December: 22.3°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (15.8°F).
Average pressure in December
Cromwell, IA
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in December
Cromwell, IA
- Average wind speed in December: 10.3mph
The windiest months (with the highest average wind speed) are January and February (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).
Average humidity in December
Cromwell, IA
- Average humidity in December: 79%
The months with the highest relative humidity are January and June (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Cromwell, IA
- Average rainfall in December: 0.79"
The wettest month (with the highest rainfall) is June (4.17").
The driest month (with the least rainfall) is January (0.75").
Average rainfall days in December
Cromwell, IA
- Average rainfall days in December: 5 days
The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (3.7 days).
Average snowfall in December
Cromwell, IA
- Average snowfall in December: 1.69"
The month with the highest snowfall is January (3.15").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Cromwell, IA
- Average snowfall days in December: 6.5 days
The month with the highest number of snowfall days is January (8.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Cromwell, IA
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in December
Cromwell, IA
- Average sunshine days in December: 19.4 days
The month with the most sunshine days is November (20.2 days).
The month with the least sunshine days is May (10.7 days).
Average UV index in December
Cromwell, IA
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Cromwell, IA
- Average cloud cover in December: 48
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are July and September (Cloud cover 30).
Average visibility in December
Cromwell, IA
- 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).
Cromwell, Iowa, USA
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