Winter Weather in Mills Wyoming, United States
Daily high temperatures increase by 4°F, from 40°F to 44°F, rarely falling below 19°F or exceeding 56°F. The lowest daily average high temperature is 34°F on December 30.
Daily low temperatures are around 20°F, rarely falling below -2°F or exceeding 38°F. The lowest daily average low temperature is 17°F on December 30.
For reference, on July 19, the hottest day of the year, temperatures in Mills typically range from 57°F to 88°F, while on December 30, the coldest day of the year, they range from 17°F to 34°F.
Average High and Low Temperature in the Winter in Mills
The figure below shows you a compact characterization of the hourly average winter temperatures. 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 the Winter in Mills
The winter in Mills experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 49% throughout the season.
The clearest day of the winter is December 19, with clear, mostly clear, or partly cloudy conditions 53% of the time.
For reference, on March 21, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 53%, while on July 4, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 77%.
Cloud Cover Categories in the Winter in Mills
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Mills, the chance of a wet day over the course of the winter is gradually increasing, starting the season at 7% and ending it at 9%.
For reference, the year's highest daily chance of a wet day is 26% on May 23, and its lowest chance is 5% on January 10.
Over the course of the winter in Mills, the chance of a day with only rain remains an essentially constant 2% throughout, the chance of a day with mixed snow and rain remains an essentially constant 2% throughout, and the chance of a day with only snow remains an essentially constant 4% throughout.
Probability of Precipitation in the Winter in Mills
To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during the winter in Mills is essentially constant, remaining about 0.1 inches throughout, and rarely exceeding 0.4 inches.
The lowest average 31-day accumulation is 0.1 inches on December 28.
Average Monthly Rainfall in the Winter in Mills
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 the winter in Mills is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 0.5 inches or falling to 0.0 inches.
The lowest average 31-day liquid-equivalent accumulation is 0.2 inches on January 20.
Average Monthly Liquid-Equivalent Snowfall in the Winter in Mills
Over the course of the winter in Mills, the length of the day is rapidly increasing. From the start to the end of the season, the length of the day increases by 1 hour, 56 minutes, implying an average daily increase of 1 minute, 18 seconds, and weekly increase of 9 minutes, 6 seconds.
The shortest day of the winter is December 21, with 9 hours, 1 minute of daylight and the longest day is February 28, with 11 hours, 11 minutes of daylight.
Hours of Daylight and Twilight in the Winter in Mills
The latest sunrise of the winter in Mills is 7:36 AM on January 3 and the earliest sunrise is 54 minutes earlier at 6:42 AM on February 28.
The earliest sunset is 4:31 PM on December 8 and the latest sunset is 1 hour, 23 minutes later at 5:53 PM on February 28.
Daylight saving time is observed in Mills during 2021, but it neither starts nor ends during the winter, so the entire season is in standard time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:27 AM and sets 15 hours, 21 minutes later, at 8:47 PM, while on December 21, the shortest day of the year, it rises at 7:33 AM and sets 9 hours, 1 minute later, at 4:34 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in the Winter in Mills
The figure below presents a compact representation of key lunar data for the winter of 2021. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.
Moon Rise, Set & Phases in the Winter in Mills
The chance that a given day will be muggy in Mills is essentially constant during the winter, remaining around 0% throughout.
Humidity Comfort Levels in the Winter in Mills
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Mills is decreasing during the winter, decreasing from 14.3 miles per hour to 13.2 miles per hour over the course of the season.
For reference, on January 9, the windiest day of the year, the daily average wind speed is 15.3 miles per hour, while on August 3, the calmest day of the year, the daily average wind speed is 8.5 miles per hour.
The highest daily average wind speed during the winter is 15.3 miles per hour on January 11.
Average Wind Speed in the Winter in Mills
The hourly average wind direction in Mills throughout the winter is predominantly from the west, with a peak proportion of 68% on January 12.
Wind Direction in the Winter in Mills
The growing season in Mills typically lasts for 4.4 months (134 days), from around May 14 to around September 26, rarely starting before April 26 or after June 1, and rarely ending before September 8 or after October 14.
The winter in Mills is reliably fully outside of the growing season.
Time Spent in Various Temperature Bands and the Growing Season in the Winter in Mills
The average accumulated growing degree days in Mills are very rapidly decreasing during the winter, decreasing by 2,474°F, from 2,479°F to 4°F, over the course of the season.
Growing Degree Days in the Winter in Mills
The average daily incident shortwave solar energy in Mills is rapidly increasing during the winter, rising by 1.7 kWh, from 2.2 kWh to 3.9 kWh, over the course of the season.
The lowest average daily incident shortwave solar energy during the winter is 2.0 kWh on December 16.
Average Daily Incident Shortwave Solar Energy in the Winter in Mills
For the purposes of this report, the geographical coordinates of Mills are 42.841 deg latitude, -106.366 deg longitude, and 5,151 ft elevation.
The topography within 2 miles of Mills contains only modest variations in elevation, with a maximum elevation change of 341 feet and an average elevation above sea level of 5,207 feet. Within 10 miles contains only modest variations in elevation (3,114 feet). Within 50 miles contains large variations in elevation (4,774 feet).
The area within 2 miles of Mills is covered by shrubs (73%) and artificial surfaces (18%), within 10 miles by shrubs (49%) and grassland (37%), and within 50 miles by shrubs (60%) and grassland (36%).
This report illustrates the typical weather in Mills, 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Mills.
For each station, the records are corrected for the elevation difference between that station and Mills 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 Mills is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Mills and a given station.
The stations contributing to this reconstruction are: Casper–Natrona County International Airport (KCPR, 91%, 11 kilometers, northwest); Converse County Airport (KDGW, 5%, 81 kilometers, east); Rawlins Municipal Airport (KRWL, 2.2%, 135 kilometers, southwest); and Arlington (KARL, 1.8%, 141 kilometers, south).
Time zones for airports and weather stations are provided by AskGeo.com .