Climate and monthly weather forecastGreen River, WY

The climate of Green River

Green River, located in Wyoming, USA, features a mid-latitude steppe, classified as a Köppen BSk climate. BSk climates are typically characterized by cold winters and warm summers, with significant temperature variations occurring throughout the year.

Looking closely into the temperature data, highs hit a peak of 81.5°F (27.5°C) in July and dip to a low of 10.8°F (-11.8°C) in January. Low temperatures follow a similar trend, soaring to 60.4°F (15.8°C) in July and dropping to an icy 11.5°F (-11.4°C) in January. Relative humidity hovers around a high of 84% in January and a low of 31% in July and August.

Weather phenomena in Green River exhibit fascinating patterns. Snowfall, which can be seen from 13.5 days in December to zero days in July and August, is clearly a defining characteristic of the local weather. The region receives 4.37" (111mm) of snow in January and December and goes months without any snow from June to September, indicating a distinct winter season.

Sunshine hours, ranging from 5.9 hours in December and January to a sun-soaked 11.8 in July and August, varies with the changing seasons. While the longest daylight hours are seen in June with 15.1 hours, the shortest are in December with just 9.2 hours. Wind, on the other hand, varies from a mild 8.8mph (14.2km/h) in July to 12.2mph (19.6km/h) in April creating a diverse mix of breezy and calm periods.

The best time to visit Green River

The optimal time for a visit to Green River hinges on the visitor's weather preferences. For sun lovers and those keen on enjoying outdoor activities to their fullest extent, the months of June, July, and August are perfect. During this period, daylight extends to its longest between 14.8 hours and 15.1 hours, while the generous sunshine clocks around 11.7 to 11.8 hours.

Visitors during this phase will find temperatures in the range from highs of 70.3°F (21.3°C) to 81.5°F (27.5°C) and lows from 51.3°F (10.7°C) to 60.4°F (15.8°C) making it the most pleasantly warm period in the year. These are also the least humid months with relative humidity around 31% to 36%, providing a dry and comfortable environment.

The worst time to visit Green River

Without any doubt, the least favorable period to visit Green River would be the freezing winter months from December to February. During these months, the high temperatures barely reach above freezing with the maximum temperature fluctuating from 25.7°F (-3.5°C) to 39.7°F (4.3°C), while the lows fall between 10.8°F (-11.8°C) and 24.3°F (-4.3°C).

Snowfall is a common occurrence throughout these months with as much as 6.14" (156mm) in March and snow falling on up to 13.5 days in December. The relative humidity is highest in this season, peaking at 84% in January which exacerbates the chill factor.

Spring weather in Green River

Spring, which spans from March to May, sees a gradual warming trend. High temperatures range from 39.7°F (4.3°C) in March to a more inviting 60.3°F (15.7°C) in May, while lows rise from 24.3°F (-4.3°C) to 41.4°F (5.2°C). The rainfall marginally increases from 1.18" (30mm) to 1.5" (38mm) but snowfall starts to decrease, making way for clearer days.

Visibility holds constant at 6 miles throughout, and the duration of daylight increases from 12 hours in March to a sizable 14.5 hours in May. This period also sees a decrease in cloud coverage, dropping from 36% in March to 26% in May, which gives clearer skies for outdoor activities.

Summer weather in Green River

Summer in Green River, from June to August, is undoubtedly the warmest time of the year. With high temperatures dancing around from 70.3°F (21.3°C) to 81.5°F (27.5°C) and lows from the comfortable range of 51.3°F (10.7°C) to 60.4°F (15.8°C). Rainfall drops to its minimum and the days are longer, with daylight peaking at 15.1 hours in June.

Autumn weather in Green River

The Autumn months, September to November, herald the transition from the warm summer to the chilly winter. The high temperature rapidly dips from 70.3°F (21.3°C) to 38.7°F (3.7°C) while lows follow suit, dropping from 51.3°F (10.7°C) to 23.9°F (-4.5°C). The periods of sunshine lessen from 10.7 hours to 6.9 hours with the daylight hours also contracting from 12.5 hours to 9.9 hours.

Winter weather in Green River

Winter in Green River, which includes December, January, and February, is an icy period of the year. Maximum temperatures peak at the freezing point, wavering between 25.7°F (-3.5°C) and 39.7°F (4.3°C), while minimum temperatures drop to bone-chilling lows from 10.8°F (-11.8°C) to 24.3°F (-4.3°C). The snowfall, peaking at 4.37" (111mm), adds to the severity of the winter. Limited hours of sunshine and short daylight exposure become characteristic features of these cold months.

Weather in January

The winter frost envelops Green River, Wyoming, in January, as temperatures plunge to their lowest at this time of the year. Transitioning from a colder December, January experiences a slight increase in average low temperature at 10.8°F (-11.8°C) while boasting an average high of 26.6°F (-3°C). Weather in January »

Weather in February

February marks the continuation of winter weather in Green River, Wyoming, boasting a slightly warmer atmosphere than January. The climate experiences a noticeable rise in minimum and maximum temperatures, averaging 13.5°F (-10.3°C) and 28.8°F (-1.8°C) respectively. Weather in February »

Weather in March

Weather in March witnesses a distinct shift towards spring in Green River. As the city emerges from the cold winter, the temperature rises significantly from February's average, with the mercury reading between 24.3°F (-4.3°C) and 39.7°F (4.3°C). Weather in March »

Weather in April

April brings a pronounced change in Green River's weather with a transition from the raw, cold winter to warmer and rejuvenating spring weather. As the harsh winter subsides, temperatures climb significantly high to 48.7°F (9.3°C) and low to 31.5°F (-0.3°C) compared to March. Weather in April »

Weather in May

The last month of the spring, May, is a mild month in Green River, Wyoming, with an average temperature ranging between min 41.4°F (5.2°C) and max 60.3°F (15.7°C). The beginning of May marks a shift in the average high-temperature, moving from April's chilly 48.7°F (9.3°C) to a mild 60.3°F (15.7°C). Weather in May »

Weather in June

June, the first month of the summer in Green River, is a moderately hot month, with an average temperature fluctuating between 52°F (11.1°C) and 73.9°F (23.3°C). Green River sees a rise in temperature during June, with average high-temperatures transitioning from a refreshing 60.3°F (15.7°C) in May to a warm 73.9°F (23.3°C). Weather in June »

Weather in July

July exhibits peak summer conditions in Green River, Wyoming, with temperatures soaring high. An increase in temperature to the year's highest average of 81.5°F (27.5°C) (high) and 60.4°F (15.8°C)(low) delineate the apex of summer. Weather in July »

Weather in August

In Green River, Wyoming, while August sees continuity in the summer season, it also hints at the approaching autumn. The weather experiences a slight dip in the average high temperature from July's peak to 79.3°F (26.3°C). Rainfall rises marginally to 0.55in yet fails to disrupt the bright sunny days and extensive daylight hours, synonymous with summer. Weather in August »

Weather in September

September indicates the onset of autumn in Green River, Wyoming, characterised by a significant drop in temperatures. The weather becomes noticeably milder from the preceding August, as maximum temperatures fall to 70.3°F (21.3°C) and minimum to 51.3°F (10.7°C). Weather in September »

Weather in October

Green River, Wyoming, witnesses the full swing of autumn in October. A pronounced difference is seen, particularly in temperature that dips to a significantly cooler average high of 52.5°F (11.4°C) and low of 36°F (2.2°C), compared to September. Weather in October »

Weather in November

November signifies the onset of winter in Green River, Wyoming, as temperatures plummet and snowfall regains prominence. A steep drop in average temperatures, with highs averaging 38.7°F (3.7°C) and lows around 23.9°F (-4.5°C), mark a colder qtr2 after a noticeably warmer October. Weather in November »

Weather in December

Winter takes a firm hold in Green River, Wyoming, during December. Temperatures continue their downward trend since November, with average lows of 11.5°F (-11.4°C), coldest for the year, and highs at 25.7°F (-3.5°C). An additional increase in snowfall underpins the grip of winter, as shifts in the frequented weather pattern signify the city's complete move into the cold season. Weather in December »