December weather forecastPortland, MO
December
Weather in December
December, the first month of the winter in Portland, is also an icy month, with temperature in the range of an average low of 28.6°F (-1.9°C) and an average high of 41.5°F (5.3°C).Temperature
With December's arrival, Portland, Missouri, sees a decrease in average high-temperatures, moving from a fresh 52.9°F (11.6°C) in November to an icy 41.5°F (5.3°C). An average low-temperature of 28.6°F (-1.9°C) is recorded during the nights in December in Portland.Humidity
The average relative humidity in December in Portland is 77%.Rainfall
In Portland, in December, during 6.9 rainfall days, 1.65" (42mm) of precipitation is typically accumulated. In Portland, during the entire year, the rain falls for 139.9 days and collects up to 28.19" (716mm) of precipitation.Snowfall
January through April, October through December are months with snowfall. In Portland, in December, during 3.4 snowfall days, 1.38" (35mm) of snow is typically accumulated. In Portland, during the entire year, snow falls for 17.9 days and aggregates up to 8.78" (223mm) of snow.Daylight
December has the shortest days of the year in Portland, with an average of 9h and 30min of daylight.On the first day of the month, sunrise is at 7:06 am and sunset at 4:45 pm. On the last day of December, in Portland, sunrise is at 7:24 am and sunset at 4:55 pm CST.
Sunshine
The average sunshine in December is 5h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for average individuals.Note: In December, the average maximum UV index of 2 translates into the following recommendations:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. When the Sun is at its strongest around midday, find shade and limit exposure. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Portland, MO
- Average high temperature in December: 41.5°F
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (37°F).
- Average low temperature in December: 28.6°F
The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (23°F).
Average pressure in December
Portland, MO
- 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 (29.91"Hg).
Average wind speed in December
Portland, MO
- Average wind speed in December: 8.9mph
The windiest month (with the highest average wind speed) is January (9.2mph).
The calmest month (with the lowest average wind speed) is July (5.9mph).
Average humidity in December
Portland, MO
- Average humidity in December: 77%
The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Portland, MO
- Average rainfall in December: 1.65"
The wettest month (with the highest rainfall) is May (3.58").
The driest month (with the least rainfall) is January (1.34").
Average rainfall days in December
Portland, MO
- Average rainfall days in December: 6.9 days
The month with the highest number of rainy days is May (16.4 days).
The month with the least rainy days is January (6 days).
Average snowfall in December
Portland, MO
- Average snowfall in December: 1.38"
The month with the highest snowfall is February (2.83").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Portland, MO
- Average snowfall days in December: 3.4 days
The month with the highest number of snowfall days is January (5.6 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
Portland, MO
- Average daylight in December: 9h and 30min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in December: 5h and 0min
The months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).
Average sunshine days in December
Portland, MO
- Average sunshine days in December: 20.3 days
The month with the most sunshine days is January (20.5 days).
The month with the least sunshine days is May (12.3 days).
Average UV index in December
Portland, MO
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Portland, MO
- Average cloud cover in December: 47
The month with the most cloud cover is February (Cloud cover 50).
The months with the least cloud cover are June, July and August (Cloud cover 29).
Average visibility in December
Portland, MO
- 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).
