December weather forecast and climate
Olney, MO

December, the first month of the winter, in Olney, is also a wintry month, with average temperature fluctuating between 28.4°F (-2°C) and 41°F (5°C).

Temperature

In December, the average high-temperature decreases, from a cool 52.5°F (11.4°C) in November, to a cold 41°F (5°C). The average low-temperature, in December, is 28.4°F (-2°C).

Humidity

In Olney, the average relative humidity is 77%.

Rainfall

In December, the rain falls for 6.5 days. Throughout December, 1.73" (44mm) of precipitation is accumulated. In Olney, during the entire year, the rain falls for 139.8 days and collects up to 28.7" (729mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall in Olney, Missouri. In December, in Olney, Missouri, it is snowing for 4 days. Throughout December, 1.54" (39mm) of snow is accumulated. Throughout the year, in Olney, there are 19.7 snowfall days, and 9.49" (241mm) of snow is accumulated.

Daylight

With an average of 9.5h of daylight, December has the shortest days of the year.

Sunshine

The average sunshine in Olney is 4.9h.

UV index

Months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to the UV radiation for the average person.
Note: The daily maximum UV index of 2 interpret into the following advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in December in Olney?

In December, the average high-temperature is 41°F (5°C), and the average low-temperature is 28.4°F (-2°C).

What is the average humidity in December in Olney?

The average relative humidity in December is 77%.

How many days does it rain in December in Olney?

In Olney, Missouri, in December, it is raining for 6.5 days, with typically 1.73" (44mm) of accumulated precipitation.

How much does it snow in Olney in December?

In December, in Olney, Missouri, it is snowing for 4 days. Throughout December, 1.54" (39mm) of snow is accumulated.

What is the month with the shortest days in Olney?

With an average of 9.5h of daylight, December has the shortest days of the year.

What is the average length of the day in December in Olney?

In Olney, the average length of the day in December is 9.5h.

How long on average sun shines in December in Olney?

In December, the average sunshine in Olney is 4.9h.

When is the lowest UV index in Olney?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the UV index reading in December in Olney?

In Olney, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health threat from unprotected exposure to the UV radiation.
Average temperature in December - Olney, MO
  • Average high temperature in December: 5°C

The warmest month (with the highest average high temperature) is July (30.4°C).
The month with the lowest average high temperature is January (2.3°C).

  • Average low temperature in December: -2°C

The month with the highest average low temperature is July (19.8°C).
The coldest month (with the lowest average low temperature) is January (-5.3°C).

Average pressure in December - Olney, MO
  • Average pressure in December: 1020.2mbar

The month with the highest atmospheric pressure is January (1021.2mbar).
The month with the lowest atmospheric pressure is June (1013mbar).

Average wind speed in December - Olney, MO
  • Average wind speed in December: 14.5km/h

The windiest month (with the highest average wind speed) is January (15km/h).
The calmest month (with the lowest average wind speed) is July (9.6km/h).

Average humidity in December - Olney, 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 - Olney, MO
  • Average rainfall in December: 44mm

The wettest month (with the highest rainfall) is May (86mm).
The driest months (with the least rainfall) are January and February (37mm).

Average rainfall days in December - Olney, MO
  • Average rainfall days in December: 6.5 days

The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is December (6.5 days).

Average snowfall in December - Olney, MO
  • Average snowfall in December: 39mm

The month with the highest snowfall is January (79mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

Average snowfall days in December - Olney, MO
  • Average snowfall days in December: 4 days

The month with the highest number of snowfall days is February (5.9 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in December / Average sunshine in December - Olney, MO
  • Average daylight in December: 9.5h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in December: 4.9h

The month with the most sunshine is June (Average sunshine: 10.2h).
The month with the least sunshine is January (Average sunshine: 4.4h).

Average sunshine days in December - Olney, MO
  • Average sunshine days in December: 20 days

The month with the most sunshine days is December (20 days).
The month with the least sunshine days is May (12.2 days).

Average UV index in December - Olney, MO
  • Average UV index in December: 2

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in December - Olney, MO
  • Average cloud cover in December: 49

The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 30).

Average visibility in December - Olney, MO
  • Average visibility in December: 9km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).