Climate and monthly weather forecastRiverton, WY
Climate and monthly weather forecast
The climate of Riverton
Characterized by the Köppen climate classification as BSk, which signifies a mid-latitude steppe climate, Riverton experiences sharp seasonal variations in temperature, precipitation, and sunshine hours. Geographically nestled in the heart of Wyoming, the town is subject to an arid, flatland climate.Throughout the year, Riverton experiences a wide temperature range, with monthly average highs swinging from 31.5°F (-0.3°C) in January to 87.1°F (30.6°C) in July, and lows oscillating between 14.5°F (-9.7°C) in January to 61.5°F (16.4°C) in July. Precipitation also displays significant seasonal variance, with rainfall peaking at 1.42" (36mm) in May and dwindling to as low as 0.31" (8mm) during less rainy months of July, August, and December. Concurrently, the averaged snowfall reaches the maximum of 5.39" (137mm) in April and completely dissipates from June to September.
It is noteworthy to mention the changing patterns of sunlight in Riverton. The town bathes in sunlight for an impressive average of 15.3 hours a day in June, shedding it down to a minimal 9.1 hours a day in December. During the sunnier months, from May to August, Riverton boasts between 11.9 and 12 hours of sunshine.
The best time to visit Riverton
Considering the weather data, it becomes evident that the most comfortable period to visit Riverton would likely he in late spring or early summer, specifically from May to June. During this timeframe, temperatures remain pleasant and range between 54.1°F (12.3°C) and 79.3°F (26.3°C). The rainfall is on the higher side at 1.42" (36mm) in May, descending to 0.47" (12mm) in June, providing an appropriate mixture of sun and slight moisture. Moreover, these months boast the longest daylight hours, ranging from 14.7 hours in May to 15.3 hours in June, maximizing the time for explorations and outdoor activities.The worst time to visit Riverton
Contrastingly, winter months, in particular from December to February, might pose challenges to visitors due to harsher climatic conditions. Temperatures during these months plummet down with highs barely exceeding 32.9°F (0.5°C) and lows reaching a chilling 14.5°F (-9.7°C). Additionally, the town experiences considerable snowfall during this period, peaking at 3.27" (83mm) in February. Limited daylight hours spanning between 9.1 to 10.6 hours, along with reduced visibility, further limit outdoor pursuits during this time.Spring weather in Riverton
Spring in Riverton, extending from March to May, exhibits a gradual increase in temperatures with highs elevating from 46°F (7.8°C) to 64.8°F (18.2°C) and lows warming up from 27.9°F (-2.3°C) to 44.1°F (6.7°C). Rainfall is also on the rise during spring, attaining its annual peak of 1.42" (36mm) in May. Simultaneously, the snowfall shows a declining pattern with the last snow in May registering about 3.39" (86mm) on average. The town enjoys an increase in daylight hours to 14.7 hours in May, accompanied by an enhanced visibility of 6 miles, making it a pleasant time to explore the outdoors.Summer weather in Riverton
Summer, spanning from June to August, presents Riverton at its warmest. The temperatures reach their peak with highs averaging from 79.3°F (26.3°C) to 87.1°F (30.6°C) and lows simmering between 54.7°F (12.6°C) and 61.5°F (16.4°C). Rainfall is reasonably low during this period, coming down to its annual minimum of 0.31" (8mm) in July and August. Remarkably, the town basks in maximum sunlight, boasting up to 15.3 hours of daylight in June. With the highest UV index of 7 in July and a reduced cloud cover to only 12%, conditions are ideal for sun-seekers and outdoor enthusiasts.Autumn weather in Riverton
As Autumn sets in Riverton, from September to November, temperatures start to retract from highs of 75.6°F (24.2°C) to 45°F (7.2°C) and lows from 52.9°F (11.6°C) to 26.4°F (-3.1°C). Rainfall tends to fluctuate during this time, averaging from 0.55" (14mm) in September to 0.47" (12mm) in November. While a mild snowfall of 0.63" (16mm) shows up in September, it significantly increases to 3.35" (85mm) in November. Granted the decrease in daylight hours to 9.7 hours in November, the town still provides ample opportunity to relish the changing leaf colors of the season owing to its average visibility of 6 miles.Winter weather in Riverton
Winter orchestrates chilling temperatures in Riverton, with December to February experiencing highs descending from 30.9°F (-0.6°C) to 31.5°F (-0.3°C) and lows dropping from 14.7°F (-9.6°C) to 14.5°F (-9.7°C). Precipitation takes the form of snowfall, averaging between 2.24" (57mm) in December to 3.27" (83mm) in February. The town witnesses a reduced daylight period falling to a year-low of 9.1 hours in December. Despite the cold winds at an average speed of about 5.7mph (9.2km/h) in December and gradually increasing to 6mph (9.7km/h) in February, the winter season bequeaths an unmatched, frosty beauty to the landscape of Riverton.Weather in January
The frosty, Riverton January starts the year with the lowest temperatures, with the mercury dropping as far down as 14.5°F (-9.7°C) and not rising significantly higher than 31.5°F (-0.3°C). This month is characterized by considerable snowfall, complemented by the dominant force of frosty winds and quite constrained daylight hours. Weather in January »Weather in February
February is slightly warmer compared to January, however, it remains a cold month with an overall drop in humidity. Biting cold temperatures prevail throughout the month, and the snow continues to blanket the town of Riverton from time to time. Weather in February »Weather in March
In March, Riverton starts to witness the transition from winter to spring. However, the town receives the most rainfall of the year, 0.79 inch, a substantial increase compared to previous months. With it comes a noteworthy increase in the daily average temperature, allowing the snow to start melting and turn into a consistent drizzle. Weather in March »Weather in April
From bitterly cold temperatures, the town of Riverton finds itself enjoying slightly more warmth in April. Although it is a wet month, it seems the frequent rains serve to cleanse the residues of winter from the town. Sunshine lingers longer in the sky, due to longer daylight hours, mirroring Riverton’s transition into the comfortably pleasant territory. Weather in April »Weather in May
Warming up to 64.8°F (18.2°C), May in Riverton signals the imminent arrival of summer. It is under these conditions, with noticeably less rain but not yet fully embraced by summer heat, that there emerges the ideal climate for outdoor activities. Weather in May »Weather in June
In Riverton, June finally brings an end to the rainy season and marks the onset of the warmest part of the year. This change invites the community to partake in a range of outdoor events and activities, from festivals and fairs to outdoor grilling. Weather in June »Weather in July
The zenith of summer heat in Riverton is July, with temperatures soaring to a scorching 87.1°F (30.6°C). It is also the driest month, receiving a mere 0.31" (8mm) of rainfall. The sky is more or less clear, allowing the sun to beam down with unfiltered intensity. Weather in July »Weather in August
August in Riverton brings about slight reductions in temperature compared to July, but it still ranks among the warmer months of the year. With the rainfall remaining low and the daylight hours still relatively prolonged, summer holds its grip firm. Weather in August »Weather in September
With temperatures falling to a slightly chillier 75.6°F (24.2°C), September sees the commencement of autumn in Riverton. As summer transitions into fall, a mere 0.55" (14mm) of rainfall make it the driest period of the year. Weather in September »Weather in October
October sees a significant drop in temperature in Riverton, laying solid grounds for the upcoming winter season. The town bathes in the warm glow of the setting sun that gets noticeably earlier every day, signaling the call of winter. Weather in October »Weather in November
November in Riverton is chilly, to say the least, with the temperature dropping rapidly to a high of 45°F (7.2°C). As the cold grows more intense, the town is greeted by snowfall, subtly transitioning from autumn to the harsh Wyoming winter. Weather in November »Weather in December
December brings the full force of winter to Riverton with temperatures plunging to as low as 14.7°F (-9.6°C). The snow-covered landscapes characterized by this month are postcard-worthy, creating an awe-inspiring winter wonderland. Weather in December »Updated: Jun 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January is the most humid month in Riverton, with an average relative humidity of 77%.
The month with the least rainfall is January, when the rain falls for 2.5 days and typically collects 0.24" (6mm) of precipitation.
Throughout the year, in Riverton, there are 67.3 rainfall days, and 6.93" (176mm) of precipitation is accumulated.
Months with snowfall in Riverton are January through May, September through December.
Throughout the year, there are 42.8 snowfall days, and 25.47" (647mm) of snow is accumulated.
With an average of 6.6h of sunshine, January has the least sunshine of the year in Riverton.
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from MST to MDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from MDT to MST.
April is the month with the most snowfall. Snow falls for 5.7 days and accumulates 5.39" (137mm) of snow.
The month with the most rainfall is May, when the rain falls for 9.9 days and typically aggregates up to 1.42" (36mm) of precipitation.
June through August are months without snowfall.
The month with the longest days is June, with an average of 15h and 18min of daylight.
July stands out as Riverton's warmest month, with temperatures ranging between an average high of 87.1°F (30.6°C) and a low of 61.5°F (16.4°C).
The months with the lowest humidity are July and August, with an average relative humidity of 31%.
July has the most sunshine of the year, with an average of 12h of sunshine.
July is the month with the highest UV index, with an average maximum UV index of 7.
December brings the lowest temperatures, with an average high of 30.9°F (-0.6°C) and an average low of 14.7°F (-9.6°C).
With an average of 9h and 6min of daylight, December has the shortest days of the year.
Average temperature
Riverton, WY
The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is December (30.9°F).
The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is January (14.5°F).
Average pressure
Riverton, WY
- Average pressure in January:
30.22"Hg - Average pressure in February:
30.14"Hg - Average pressure in March:
30.03"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.91"Hg - Average pressure in June:
29.89"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.96"Hg - Average pressure in September:
29.98"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.11"Hg - Average pressure in December:
30.2"Hg
The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed
Riverton, WY
- Average wind speed in January:
5.5mph - Average wind speed in February:
6mph - Average wind speed in March:
7.1mph - Average wind speed in April:
7.4mph - Average wind speed in May:
6.9mph - Average wind speed in June:
7.5mph
- Average wind speed in July:
6.6mph - Average wind speed in August:
6.3mph - Average wind speed in September:
6.5mph - Average wind speed in October:
6.5mph - Average wind speed in November:
6.2mph - Average wind speed in December:
5.7mph
The windiest month (with the highest average wind speed) is June (7.5mph).
The calmest month (with the lowest average wind speed) is January (5.5mph).
Average humidity
Riverton, WY
The month with the highest relative humidity is January (77%).
The months with the lowest relative humidity are July and August (31%).
Average rainfall
Riverton, WY
- Average rainfall in January:
0.24" - Average rainfall in February:
0.43" - Average rainfall in March:
0.79" - Average rainfall in April:
1.14" - Average rainfall in May:
1.42" - Average rainfall in June:
0.47"
- Average rainfall in July:
0.31" - Average rainfall in August:
0.31" - Average rainfall in September:
0.55" - Average rainfall in October:
0.47" - Average rainfall in November:
0.47" - Average rainfall in December:
0.31"
The wettest month (with the highest rainfall) is May (1.42").
The driest month (with the least rainfall) is January (0.24").
Average rainfall days
Riverton, WY
- Average rainfall days in January:
2.5 days - Average rainfall days in February:
3.7 days - Average rainfall days in March:
5.5 days - Average rainfall days in April:
8.8 days - Average rainfall days in May:
9.9 days - Average rainfall days in June:
7.8 days
- Average rainfall days in July:
6.2 days - Average rainfall days in August:
6.3 days - Average rainfall days in September:
6 days - Average rainfall days in October:
4.9 days - Average rainfall days in November:
2.6 days - Average rainfall days in December:
3.1 days
The month with the highest number of rainy days is May (9.9 days).
The month with the least rainy days is January (2.5 days).
Average snowfall
Riverton, WY
- Average snowfall in January:
1.69" - Average snowfall in February:
3.27" - Average snowfall in March:
4.25" - Average snowfall in April:
5.39" - Average snowfall in May:
3.39" - Average snowfall in June:
0"
The month with the highest snowfall is April (5.39").
The months with the least snowfall are June, July and August (0").
Average snowfall days
Riverton, WY
- Average snowfall days in January:
5.6 days - Average snowfall days in February:
7.8 days - Average snowfall days in March:
5.7 days - Average snowfall days in April:
5.7 days - Average snowfall days in May:
2.3 days - Average snowfall days in June:
0.1 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0.3 days - Average snowfall days in October:
3.1 days - Average snowfall days in November:
5.5 days - Average snowfall days in December:
6.7 days
The month with the highest number of snowfall days is February (7.8 days).
The months with the least snowfall days are July and August (0 days).
Average daylight / Average sunshine
Riverton, WY
- Average daylight in January:
9h and 24min - Average daylight in February:
10h and 36min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 42min - Average daylight in June:
15h and 18min
- Average daylight in July:
15h and 0min - Average daylight in August:
13h and 54min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 42min - Average daylight in December:
9h and 6min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in January:
6h and 36min - Average sunshine in February:
6h and 42min - Average sunshine in March:
8h and 48min - Average sunshine in April:
10h and 42min - Average sunshine in May:
11h and 0min - Average sunshine in June:
11h and 54min
- Average sunshine in July:
12h and 0min - Average sunshine in August:
11h and 54min - Average sunshine in September:
10h and 42min - Average sunshine in October:
7h and 12min - Average sunshine in November:
7h and 0min - Average sunshine in December:
6h and 42min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 6h and 36min).
Average sunshine days
Riverton, WY
- Average sunshine days in January:
24.5 days - Average sunshine days in February:
19.6 days - Average sunshine days in March:
20.9 days - Average sunshine days in April:
15.5 days - Average sunshine days in May:
17 days - Average sunshine days in June:
18.8 days
- Average sunshine days in July:
19.3 days - Average sunshine days in August:
18.9 days - Average sunshine days in September:
20.2 days - Average sunshine days in October:
22.5 days - Average sunshine days in November:
23.1 days - Average sunshine days in December:
23.5 days
The month with the most sunshine days is January (24.5 days).
The month with the least sunshine days is April (15.5 days).
Average UV index
Riverton, WY
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
Riverton, WY
The months with the most cloud cover are February and April (Cloud cover 28).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility
Riverton, WY
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
