December weather forecastBrooklyn, IA
December
Weather in December
The first month of the winter, December, is also an icy month in Brooklyn, Iowa, with an average temperature ranging between max 32.9°F (0.5°C) and min 22.1°F (-5.5°C).Temperature
The shift from November to December involves a decrease in the average high-temperature, dropping from a frosty 46.2°F (7.9°C) to a wintry 32.9°F (0.5°C). The average low-temperature in Brooklyn, Iowa, during December nights is a freezing cold 22.1°F (-5.5°C).Humidity
In December, the average relative humidity is 81%.Rainfall
In Brooklyn, Iowa, during December, the rain falls for 7.2 days and regularly aggregates up to 1.26" (32mm) of precipitation. Throughout the year, in Brooklyn, there are 135.6 rainfall days, and 27.48" (698mm) of precipitation is accumulated.Snowfall
Months with snowfall in Brooklyn are January through May, October through December. In Brooklyn, in December, during 7.3 snowfall days, 2.13" (54mm) of snow is typically accumulated. Throughout the year, in Brooklyn, there are 35.5 snowfall days, and 13.98" (355mm) of snow is accumulated.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year in Brooklyn.On the first day of the month, sunrise is at 7:18 am and sunset at 4:40 pm. On the last day of December, sunrise is at 7:36 am and sunset at 4:49 pm CST.
Sunshine
In Brooklyn, the average sunshine in December is 4.5h.UV index
In Brooklyn, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: During December, 2 as the daily maximum UV index converts into the following advice:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Brooklyn, IA
- Average high temperature in December: 32.9°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in December: 22.1°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (13.6°F).
Average pressure in December
Brooklyn, IA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in December
Brooklyn, IA
- Average wind speed in December: 10.2mph
The windiest months (with the highest average wind speed) are January and April (10.7mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity in December
Brooklyn, IA
- Average humidity in December: 81%
The months with the highest relative humidity are January, February and July (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Brooklyn, IA
- Average rainfall in December: 1.26"
The wettest month (with the highest rainfall) is May (4.21").
The driest month (with the least rainfall) is January (1.02").
Average rainfall days in December
Brooklyn, IA
- Average rainfall days in December: 7.2 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is February (4.6 days).
Average snowfall in December
Brooklyn, IA
- Average snowfall in December: 2.13"
The month with the highest snowfall is January (4.49").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Brooklyn, IA
- Average snowfall days in December: 7.3 days
The month with the highest number of snowfall days is January (9.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Brooklyn, IA
- Average daylight in December: 9h and 12min
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 30min
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 0min).
Average sunshine days in December
Brooklyn, IA
- Average sunshine days in December: 18.5 days
The month with the most sunshine days is December (18.5 days).
The month with the least sunshine days is June (10.8 days).
Average UV index in December
Brooklyn, IA
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Brooklyn, IA
- Average cloud cover in December: 53
The month with the most cloud cover is January (Cloud cover 56).
The months with the least cloud cover are August and September (Cloud cover 30).
Average visibility in December
Brooklyn, IA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
