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 transition from November to December brings a clear temperature drop, with average high-temperatures decreasing from a frosty 47.3°F (8.5°C) to a wintry 32.2°F (0.1°C). In the month of December, Castana witnesses a consistent average low-temperature of 20.3°F (-6.5°C).Humidity
The average relative humidity in December is 79%.Rainfall
In December, the rain falls for 3.5 days. Throughout December, 1.42" (36mm) of precipitation is accumulated. Throughout the year, in Castana, there are 117.6 rainfall days, and 21.89" (556mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, October through December. In Castana, in December, snow falls for 7 days, with typically accumulated 2.13" (54mm) of snow. In Castana, during the entire year, snow falls for 32.9 days and aggregates up to 11.69" (297mm) of snow.Daylight
December has the shortest days of the year in Castana, Iowa, with an average of 9h and 12min of daylight.On the first day of December in Castana, sunrise is at 7:33 am and sunset at 4:52 pm. On the last day of the month, sunrise is at 7:51 am and sunset at 5:02 pm CST.
Sunshine
In Castana, Iowa, the average sunshine in December is 4.9h.UV index
The months with the lowest UV index are February and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for average individuals.Note: In December, a daily UV index of 1 turns into the following recommendations:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Frequently asked questions
How cold is December in Castana?
What is the average humidity in December in Castana?
How many days does it rain in December in Castana?
How many days does it snow in December in Castana?
What is the month with the shortest days in Castana?
What is the average length of the day in December in Castana?
When is the sunrise / sunset in December in Castana?
How long on average sun shines in December in Castana?
What are the months with the lowest UV index in Castana?
What is the UV index intensity in December in Castana?
Average temperature in December
Castana, IA
- Average high temperature in December: 32.2°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (28°F).
- Average low temperature in December: 20.3°F
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).
Average pressure in December
Castana, 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 (29.86"Hg).
Average wind speed in December
Castana, IA
- Average wind speed in December: 10mph
The windiest month (with the highest average wind speed) is April (10.9mph).
The calmest month (with the lowest average wind speed) is July (7.4mph).
Average humidity in December
Castana, IA
- Average humidity in December: 79%
The month with the highest relative humidity is January (82%).
The months with the lowest relative humidity are April and October (66%).
Average rainfall in December
Castana, IA
- Average rainfall in December: 1.42"
The wettest month (with the highest rainfall) is May (3.31").
The driest month (with the least rainfall) is January (0.67").
Average rainfall days in December
Castana, IA
- Average rainfall days in December: 3.5 days
The month with the highest number of rainy days is May (16.6 days).
The month with the least rainy days is February (2.7 days).
Average snowfall in December
Castana, IA
- Average snowfall in December: 2.13"
The month with the highest snowfall is February (3.03").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Castana, IA
- Average snowfall days in December: 7 days
The month with the highest number of snowfall days is January (8.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Castana, IA
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in December
Castana, IA
- Average sunshine days in December: 20.7 days
The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is June (12 days).
Average UV index in December
Castana, IA
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are February and December (UV index 1).
Average cloud cover in December
Castana, IA
- Average cloud cover in December: 48
The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 26).
Average visibility in December
Castana, 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).
Castana, Iowa, USA
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