December weather forecastZillah, WA
December
Weather in December
The first month of the winter, December, is still a cold month in Zillah, Washington, with an average temperature ranging between max 36.7°F (2.6°C) and min 25.7°F (-3.5°C).Temperature
December is the month that records the lowest temperatures, with averages ranging from a high of 36.7°F (2.6°C) to a low of 25.7°F (-3.5°C).Humidity
In Zillah, the average relative humidity in December is 81%.Rainfall
In Zillah, in December, it is raining for 10.5 days, with typically 0.87" (22mm) of accumulated precipitation. Throughout the year, there are 98.5 rainfall days, and 6.97" (177mm) of precipitation is accumulated.Snowfall
Months with snowfall in Zillah are January through March, September, November and December. In Zillah, Washington, in December, snow falls for 5 days, with typically accumulated 1.42" (36mm) of snow. In Zillah, during the entire year, snow falls for 17.1 days and aggregates up to 6.69" (170mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 42min of daylight.On the first day of the month, sunrise is at 7:24 am and sunset at 4:15 pm. On the last day of December, in Zillah, sunrise is at 7:44 am and sunset at 4:24 pm PST.
Sunshine
In December, the average sunshine in Zillah is 5.7h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Zillah. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the ordinary person.Note: The daily maximum UV index of 2 in December interprets into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Be alert! Nearly double the UV rays 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
Zillah, WA
- Average high temperature in December: 36.7°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is December (36.7°F).
- Average low temperature in December: 25.7°F
The month with the highest average low temperature is August (60.8°F).
The coldest month (with the lowest average low temperature) is December (25.7°F).
Average pressure in December
Zillah, WA
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is August (29.93"Hg).
Average wind speed in December
Zillah, WA
- Average wind speed in December: 4.7mph
The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest month (with the lowest average wind speed) is December (4.7mph).
Average humidity in December
Zillah, WA
- Average humidity in December: 81%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is July (38%).
Average rainfall in December
Zillah, WA
- Average rainfall in December: 0.87"
The wettest month (with the highest rainfall) is January (1.02").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days in December
Zillah, WA
- Average rainfall days in December: 10.5 days
The month with the highest number of rainy days is March (12.1 days).
The month with the least rainy days is July (3.5 days).
Average snowfall in December
Zillah, WA
- Average snowfall in December: 1.42"
The month with the highest snowfall is February (2.4").
The months with the least snowfall are April, May, June, July, August and October (0").
Average snowfall days in December
Zillah, WA
- Average snowfall days in December: 5 days
The month with the highest number of snowfall days is December (5 days).
The months with the least snowfall days are April, May, June, July, August and October (0 days).
Average daylight in December /
Average sunshine in December
Zillah, WA
- Average daylight in December: 8h and 42min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 5h and 42min
The months with the most sunshine are July and August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 30min).
Average sunshine days in December
Zillah, WA
- Average sunshine days in December: 16.1 days
The month with the most sunshine days is July (25.8 days).
The month with the least sunshine days is February (14.6 days).
Average UV index in December
Zillah, WA
- Average UV index in December: 2
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Zillah, WA
- Average cloud cover in December: 40
The month with the most cloud cover is January (Cloud cover 42).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in December
Zillah, WA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
