Average Weather in December in Nyssa Oregon, United States
Daily high temperatures decrease by 7°F, from 41°F to 35°F, rarely falling below 23°F or exceeding 52°F.
Daily low temperatures decrease by 5°F, from 27°F to 22°F, rarely falling below 8°F or exceeding 39°F.
For reference, on July 27, the hottest day of the year, temperatures in Nyssa typically range from 61°F to 93°F, while on January 1, the coldest day of the year, they range from 22°F to 35°F.
Average High and Low Temperature in December
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in December
Gorobinci, Macedonia (5,994 miles away); Ankara, Turkey (6,357 miles); and Pasragad Branch, Iran (6,934 miles) are the far-away foreign places with temperatures most similar to Nyssa (view comparison).
The month of December in Nyssa experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 57% throughout the month.
The clearest day of the month is December 10, with clear, mostly clear, or partly cloudy conditions 44% of the time.
For reference, on January 11, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 60%, while on July 28, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 84%.
Cloud Cover Categories in December
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Nyssa, the chance of a wet day over the course of December is essentially constant, remaining around 22% throughout.
For reference, the year's highest daily chance of a wet day is 23% on December 1, and its lowest chance is 3% on July 30.
Over the course of December in Nyssa, the chance of a day with only rain decreases from 16% to 10%, the chance of a day with mixed snow and rain remains an essentially constant 4% throughout, and the chance of a day with only snow increases from 3% to 6%.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Nyssa is essentially constant, remaining about 0.9 inches throughout, and rarely exceeding 2.1 inches or falling below 0.1 inches.
The highest average 31-day accumulation is 1.0 inches on December 7.
Average Monthly Rainfall in December
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. As with rainfall, we consider the liquid-equivalent snowfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day liquid-equivalent snowfall during December in Nyssa is essentially constant, remaining about 0.3 inches throughout, and rarely exceeding 1.0 inches or falling to 0.0 inches.
The highest average 31-day liquid-equivalent accumulation is 0.4 inches on December 26.
Average Monthly Liquid-Equivalent Snowfall in December
Over the course of December in Nyssa, the length of the day is essentially constant. The shortest day of the month is December 21, with 8 hours, 54 minutes of daylight and the longest day is December 1, with 9 hours, 9 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Nyssa is 8:02 AM on December 1 and the latest sunrise is 20 minutes later at 8:22 AM on December 31.
The earliest sunset is 5:10 PM on December 9 and the latest sunset is 10 minutes later at 5:20 PM on December 31.
Daylight saving time is observed in Nyssa during 2018, but it neither starts nor ends during December, so the entire month is in standard time.
For reference, on June 21, the longest day of the year, the Sun rises at 6:05 AM and sets 15 hours, 28 minutes later, at 9:34 PM, while on December 21, the shortest day of the year, it rises at 8:19 AM and sets 8 hours, 54 minutes later, at 5:13 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December
The chance that a given day will be muggy in Nyssa is essentially constant during December, remaining around 0% throughout.
For reference, on August 3, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in December
The average hourly wind speed in Nyssa is essentially constant during December, remaining within 0.2 miles per hour of 6.0 miles per hour throughout.
For reference, on April 11, the windiest day of the year, the daily average wind speed is 7.3 miles per hour, while on January 13, the calmest day of the year, the daily average wind speed is 5.6 miles per hour.
The highest daily average wind speed during December is 6.2 miles per hour on December 1.
Average Wind Speed in December
Wind Direction in December
The growing season in Nyssa typically lasts for 5.6 months (171 days), from around April 25 to around October 14, rarely starting before April 5 or after May 15, and rarely ending before September 24 or after November 4.
The month of December in Nyssa is reliably fully outside of the growing season.
Time Spent in Various Temperature Bands and the Growing Season in December
The average accumulated growing degree days in Nyssa are essentially constant during December, remaining around 3,116°F throughout.
Growing Degree Days in December
The average daily incident shortwave solar energy in Nyssa is essentially constant during December, remaining within 0.1 kWh of 1.6 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 1.6 kWh on December 23.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Nyssa are 43.877 deg latitude, -116.995 deg longitude, and 2,211 ft elevation.
The topography within 2 miles of Nyssa contains only modest variations in elevation, with a maximum elevation change of 128 feet and an average elevation above sea level of 2,201 feet. Within 10 miles contains only modest variations in elevation (1,007 feet). Within 50 miles contains very significant variations in elevation (5,492 feet).
The area within 2 miles of Nyssa is covered by cropland (72%), shrubs (17%), and artificial surfaces (10%), within 10 miles by cropland (67%) and grassland (24%), and within 50 miles by shrubs (55%) and grassland (21%).
This report illustrates the typical weather in Nyssa year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Nyssa.
For each station, the records are corrected for the elevation difference between that station and Nyssa according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Nyssa is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Nyssa and a given station.
The stations contributing to this reconstruction are: Ontario Municipal Airport (77%, 16 kilometers, north); Caldwell Industrial Airport (20%, 39 kilometers, southeast); and Burns Municipal Airport (2.2%, 161 kilometers, west).
Time zones for aiports and weather stations are provided by AskGeo.com .