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
December's arrival correlates with a reduction in the average high-temperature, down from a chilly 44.6°F (7°C) in November to a subzero cold 31.8°F (-0.1°C). Throughout the month of December, Castle Grove expects an average low of 21.4°F (-5.9°C).Humidity
In Castle Grove, Iowa, the average relative humidity in December is 82%.Rainfall
In December, the rain falls for 7.7 days. Throughout December, 1.42" (36mm) of precipitation is accumulated. Throughout the year, there are 142.5 rainfall days, and 28.27" (718mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, October through December. In Castle Grove, during December, snow falls for 9.4 days and regularly aggregates up to 3.07" (78mm) of snow. In Castle Grove, Iowa, during the entire year, snow falls for 43.2 days and aggregates up to 17.17" (436mm) of snow.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year.On the first day of December in Castle Grove, sunrise is at 7:15 am and sunset at 4:33 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 4:43 pm CST.
Sunshine
In Castle Grove, the average sunshine in December is 4.2h.UV index
The months with the lowest UV index in Castle Grove, Iowa, are January and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for average individuals.Note: The maximum daily UV index of 1 in December interprets into the following recommendations:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Frequently asked questions
How cold is December in Castle Grove?
What is the average humidity in December in Castle Grove?
How much does it rain in Castle Grove in December?
How much does it snow in Castle Grove in December?
What is the month with the shortest days in Castle Grove?
How many hours of daylight does Castle Grove have in December?
When are sunrise and sunset in December in Castle Grove?
How long on average sun shines in December in Castle Grove?
What is the month with the lowest UV index in Castle Grove?
How high is the UV index in December in Castle Grove?
Average temperature in December
Castle Grove, IA
- Average high temperature in December: 31.8°F
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (25.2°F).
- Average low temperature in December: 21.4°F
The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (13.3°F).
Average pressure in December
Castle Grove, IA
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Castle Grove, IA
- Average wind speed in December: 10mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).
Average humidity in December
Castle Grove, IA
- Average humidity in December: 82%
The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is October (74%).
Average rainfall in December
Castle Grove, IA
- Average rainfall in December: 1.42"
The wettest month (with the highest rainfall) is May (4.25").
The driest months (with the least rainfall) are January and February (1.26").
Average rainfall days in December
Castle Grove, IA
- Average rainfall days in December: 7.7 days
The month with the highest number of rainy days is May (18.6 days).
The month with the least rainy days is January (5.2 days).
Average snowfall in December
Castle Grove, IA
- Average snowfall in December: 3.07"
The month with the highest snowfall is January (5.04").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Castle Grove, IA
- Average snowfall days in December: 9.4 days
The month with the highest number of snowfall days is January (12.1 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
Castle Grove, 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 1min
The months with the most sunshine are July and August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in December
Castle Grove, IA
- Average sunshine days in December: 16.7 days
The month with the most sunshine days is September (17 days).
The month with the least sunshine days is June (10.5 days).
Average UV index in December
Castle Grove, IA
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Castle Grove, IA
- Average cloud cover in December: 57
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in December
Castle Grove, IA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).
Castle Grove, Iowa, USA
Weather forecast for your location
2. Allow the app to use your location
