This exception can be explained in part since during the first winter of the study, there were 21 days of extreme cold. If there were about half that number, the trend would be Thus caution should always be used when reviewing trends since the start and end points can cause exaggerated and skewed results.
The maximum number of days of extreme temperatures during the 55 winter seasons is listed by season if two or fewer seasons had the same maximum number of days. Table 3. During warm spells in the winter, nighttime temperatures frequently remain above freezing. Chinooks, warm downslope winds, are common along the eastern slopes. Numerous valleys provide ideal pockets for the collection of cold air drainage at night.
It is common to have temperatures in the valleys considerably lower than on the nearby mountainside. Big Piney, in the Green River Valley, is such a location. Mean January temperatures in the Bighorn Basin show the variation between the lower and upper parts of the valley.
Discussion about temperature records is always of interest to the general public or special interest groups. Many a bet has been waged during coffee breaks and many are surprised by the answers. Figure 3. In Figure 3. Days with freezing temperatures or colder exceed days in the mountains but only about half that amount over portions of the eastern plains and central river basins.
Heat Stress Index is defined as the combination of high temperature and humidity that humans can physically tolerate. In the US, extreme heat may have a greater impact on human health Kalkstein and Davis, , especially among the elderly Changnon et al. The combined effects of temperature and humidity cannot be directly measured but can be assessed by a calculation of an "apparent temperature" A. The apparent temperature of "how hot it feels" should not be confused with the Heat Index 17 Figure 3.
To include values below these limits would be a misuse of the Heat Index, but rejecting those conditions would introduce bias. Therefore employment of the Steadman apparent temperature is used.
The 85th percentile values have been shown to be closely correlated with weather-related mortality statistics Kalkstein and Davis, These conditions are exceeded on average about a dozen days during July and August. In several instances, the apparent temperature is lower than the actual temperature because of very low relative humidity. Early freezes in the fall and late freezes in the spring are typical in Wyoming. This results in long winters and short growing seasons.
Wyoming is in a region of the Country where frequent variations from cold to mild periods, especially in the fall and spring occur. The average growing season freeze-free period for the principle agricultural areas is approximately days Figure 3. In the mountains and high valleys freezing temperatures may occur any time during the summer.
For the places like Star Valley and Jackson Hole, the growing season is even shorter. The earliest and latest expected freezing dates across Wyoming are shown in Figure 3. Rain falls throughout the year in Wyoming. The month with the most rain in Wyoming is August , with an average rainfall of 3. The month with the least rain in Wyoming is February , with an average rainfall of 2. As with rainfall, we consider the snowfall accumulated over a sliding day period centered around each day of the year.
Wyoming experiences significant seasonal variation in monthly snowfall. The snowy period of the year lasts for 4. The month with the most snow in Wyoming is February , with an average snowfall of 5. The snowless period of the year lasts for 8. The least snow falls around July 19 , with an average total accumulation of 0.
The length of the day in Wyoming varies significantly over the course of the year. In , the shortest day is December 21 , with 9 hours, 25 minutes of daylight; the longest day is June 20 , with 14 hours, 55 minutes of daylight. The earliest sunrise is at AM on June 13 , and the latest sunrise is 2 hours, 0 minutes later at AM on November 6. The earliest sunset is at PM on December 6 , and the latest sunset is 3 hours, 53 minutes later at PM on June Daylight saving time DST is observed in Wyoming during , starting in the spring on March 14 , lasting 7.
The figure below presents a compact representation of key lunar data for 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.
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body.
Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night. The muggier period of the year lasts for 4. The month with the most muggy days in Wyoming is July , with The month with the fewest muggy days in Wyoming is February , with 0.
This section discusses the wide-area hourly average wind vector speed and direction at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages. The average hourly wind speed in Wyoming experiences significant seasonal variation over the course of the year. The windier part of the year lasts for 7. The windiest month of the year in Wyoming is March , with an average hourly wind speed of The calmer time of year lasts for 5.
The calmest month of the year in Wyoming is July , with an average hourly wind speed of 7. The wind is most often from the north for 1. The wind is most often from the west for 1. The wind is most often from the south for 5. Wyoming is located near a large body of water e. This section reports on the wide-area average surface temperature of that water. The average water temperature experiences significant seasonal variation over the course of the year.
The time of year with warmer water lasts for 3. Peruvian Amazon Cruise. South Pacific. North America. Colors of Morocco. Costa Rica Adventure. Secluded Zanzibar. Welcome to iExplore. Email Address. Select Map Options. Reviews for Wyoming 11 Reviews. Nice place. But this in not the place to live if you have children that need any pediatric specialists.
Read More. Agree Disagree Beautiful state As long as I had the capability to come and go as I Brown and empty. If you like camping, skiing, Try Now.
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