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 average high-temperature decreases in December, shifting from a frosty 44.8°F (7.1°C) in November to a cold 32.4°F (0.2°C). In December, Cass's temperature tends to fall to an average low of 22.1°F (-5.5°C) during the night.Humidity
In Cass, the average relative humidity in December is 82%.Rainfall
In December, in Cass, the rain falls for 6.5 days. Throughout December, 1.3" (33mm) of precipitation is accumulated. Throughout the year, in Cass, there are 137.5 rainfall days, and 27.68" (703mm) of precipitation is accumulated.Snowfall
Months with snowfall in Cass are January through April, October through December. In Cass, in December, snow falls for 8.7 days, with typically accumulated 2.24" (57mm) of snow. In Cass, during the entire year, snow falls for 38.8 days and aggregates up to 15.16" (385mm) of snow.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year in Cass.On the first day of the month, sunrise is at 7:15 am and sunset at 4:34 pm. On the last day of December, in Cass, sunrise is at 7:33 am and sunset at 4:43 pm CST.
Sunshine
The average sunshine in December in Cass is 4.2h.UV index
December is the month with the lowest UV index in Cass, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: An average UV index of 1 in December transforms into this advice:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. During bright days, sunglasses that offer UVA and UVB defense are recommended. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Cass in December?
What is the average humidity in December in Cass?
How much does it rain in Cass in December?
How much does it snow in Cass in December?
What is the month with the shortest days in Cass?
How many hours of daylight does Cass have in December?
What time are sunrise and sunset in December in Cass?
How many hours of sunshine does Cass have in December?
What is the month with the lowest UV index in Cass?
What is the UV index intensity in December in Cass?
Average temperature in December
Cass, IA
- Average high temperature in December: 32.4°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 (25.5°F).
- Average low temperature in December: 22.1°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).
Average pressure in December
Cass, 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
Cass, IA
- Average wind speed in December: 10mph
The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in December
Cass, IA
- Average humidity in December: 82%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is October (74%).
Average rainfall in December
Cass, IA
- Average rainfall in December: 1.3"
The wettest month (with the highest rainfall) is May (4.45").
The driest month (with the least rainfall) is February (1.02").
Average rainfall days in December
Cass, IA
- Average rainfall days in December: 6.5 days
The month with the highest number of rainy days is May (18.2 days).
The month with the least rainy days is January (4.1 days).
Average snowfall in December
Cass, IA
- Average snowfall in December: 2.24"
The month with the highest snowfall is January (5.16").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Cass, IA
- Average snowfall days in December: 8.7 days
The month with the highest number of snowfall days is January (11.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Cass, 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 48min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in December
Cass, IA
- Average sunshine days in December: 18.2 days
The month with the most sunshine days is December (18.2 days).
The month with the least sunshine days is May (10.9 days).
Average UV index in December
Cass, IA
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Cass, IA
- Average cloud cover in December: 56
The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in December
Cass, IA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
Cass, Iowa, USA
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