December weather forecast
Hereford, OR

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Weather in December

The first month of the winter, December, is still a freezing cold month in Hereford, Oregon, with temperature in the range of an average low of 18.5°F (-7.5°C) and an average high of 30.7°F (-0.7°C).

Temperature

The coldest time of the year is December, with temperatures averaging a high of 30.7°F (-0.7°C) and a low of 18.5°F (-7.5°C).

Humidity

In Hereford, the average relative humidity in December is 86%.

Rainfall

The month with the most rainfall is December, when the rain falls for 8.6 days and typically aggregates up to 1.77" (45mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. The month with the most snowfall is December, when snow falls for 14.7 days and typically aggregates up to 10.59" (269mm) of snow.

Daylight

December has the shortest days of the year, with an average of 8h and 54min of daylight.
On the first day of the month, sunrise is at 7:09 am and sunset at 4:13 pm. On the last day of December, sunrise is at 7:28 am and sunset at 4:22 pm PST.

Sunshine

In Hereford, the average sunshine in December is 5.1h.

UV index

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: In December, a daily maximum UV index of 2 leads to the following instructions:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.

Frequently asked questions

What is the coldest time of year?

December proves to be the coldest month, recording an average maximum temperature of 30.7°F (-0.7°C) and a minimum temperature of 18.5°F (-7.5°C).

How cold is December?

During December, Hereford experiences an average high-temperature of 30.7°F (-0.7°C) and a low-temperature of 18.5°F (-7.5°C). In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines relative humidity and air temperature, is estimated at 80.6°F (27°C).

What is the average humidity in December?

In December, the average relative humidity in Hereford is 86%.

What is the rainiest month?

December is the month with the most rainfall. Rain falls for 8.6 days and accumulates 1.77" (45mm) of precipitation.

How much does it rain in December?

In Hereford, during December, the rain falls for 8.6 days and regularly aggregates up to 1.77" (45mm) of precipitation.

When does it snow the most?

December is the month with the most snowfall in Hereford, Oregon. Snow falls for 14.7 days and accumulates 10.59" (269mm) of snow.

How much does it snow in December?

In Hereford, in December, snow falls for 14.7 days, with typically accumulated 10.59" (269mm) of snow.

What is the month with the shortest days in Hereford?

The month with the shortest days in Hereford is December, with an average of 8h and 54min of daylight.

What is the average length of the day in December?

In December, the average day length is 8h and 54min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:09 am and sunset at 4:13 pm. On the last day of the month, in Hereford, sunrise is at 7:28 am and sunset at 4:22 pm PST.

How long on average sun shines in December?

In Hereford, the average sunshine duration in December is 5.1h.

What is the UV index reading in December?

In Hereford, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Hereford, OR

Average temperature in December - Hereford, OR
  • Average high temperature in December: 30.7°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is December (30.7°F).

  • Average low temperature in December: 18.5°F

The month with the highest average low temperature is August (53.8°F).
The coldest month (with the lowest average low temperature) is December (18.5°F).

Average pressure in December
Hereford, OR

Average pressure in December - Hereford, OR
  • Average pressure in December: 30.19"Hg

The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is August (29.92"Hg).

Average wind speed in December
Hereford, OR

Average wind speed in December - Hereford, OR
  • Average wind speed in December: 5.8mph

The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest months (with the lowest average wind speed) are September and October (5.4mph).

Average humidity in December
Hereford, OR

Average humidity in December - Hereford, OR
  • Average humidity in December: 86%

The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is August (40%).

Average rainfall in December
Hereford, OR

Average rainfall in December - Hereford, OR
  • Average rainfall in December: 1.77"

The wettest month (with the highest rainfall) is December (1.77").
The driest month (with the least rainfall) is August (0.31").

Average rainfall days in December
Hereford, OR

Average rainfall days in December - Hereford, OR
  • Average rainfall days in December: 8.6 days

The month with the highest number of rainy days is March (15.6 days).
The month with the least rainy days is August (4.4 days).

Average snowfall in December
Hereford, OR

Average snowfall in December - Hereford, OR
  • Average snowfall in December: 10.59"

The month with the highest snowfall is December (10.59").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Hereford, OR

Average snowfall days in December - Hereford, OR
  • Average snowfall days in December: 14.7 days

The month with the highest number of snowfall days is December (14.7 days).
The months with the least snowfall days are June, July and August (0 days).

Average daylight in December /
Average sunshine in December
Hereford, OR

Average daylight in December / Average sunshine in December - Hereford, OR
  • Average daylight in December: 8h and 5min

The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in December: 5h and 1min

The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).

Average sunshine days in December
Hereford, OR

Average sunshine days in December - Hereford, OR
  • Average sunshine days in December: 13.9 days

The month with the most sunshine days is July (22.7 days).
The months with the least sunshine days are February and March (11.3 days).

Average UV index in December
Hereford, OR

Average UV index in December - Hereford, OR
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is January (UV index 1).

Average cloud cover in December
Hereford, OR

Average cloud cover in December - Hereford, OR
  • 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 July and August (Cloud cover 9).

Average visibility in December
Hereford, OR

Average visibility in December - Hereford, OR
  • Average visibility in December: 4mi

The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (4mi).

Hereford, Oregon, USA

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