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Contents
- The climate of Thermopolis
- The best time to visit Thermopolis
- The worst time to visit Thermopolis
- Spring weather in Thermopolis
- Summer weather in Thermopolis
- Autumn weather in Thermopolis
- Winter weather in Thermopolis
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The climate of Thermopolis
Thermopolis, Wyoming belongs to the BWk zone based on the Köppen climate classification, commonly referred to as a mid-latitude desert climate. Situated in the United States, Thermopolis experiences significant variations in weather parameters throughout the year, characterized by seasonal temperature changes and fluctuations in rainfall.
Temperature highs in Thermopolis increase from 28.9°F (-1.7°C) in January and February to a peak of 84.9°F (29.4°C) in July, then decrease to 28.2°F (-2.1°C) in December. Temperature lows follow a similar pattern, starting at 12.6°F (-10.8°C) in January, rising to 61.3°F (16.3°C) in July, and then dropping again to 12.9°F (-10.6°C) in December. The rainfall ranges from 0.43" (11mm) in January to a high of 1.93" (49mm) in May, before eventually dropping to 0.51" (13mm) in December. Snowfall is common in the winter months from January to April, with an absence of snow from May to September then a slight return in October at 0.47" (12mm).
The relative humidity tends to be higher in the colder months from January to February and from November to December, peaking at 81% and 78%, respectively. Conversely, the driest months are from June to August when the relative humidity drops to 35%. The proportion of daylight hours varies over the course of the year, with the shortest day in December at 9 hours and the longest day in June at 15.4 hours.
Temperature highs in Thermopolis increase from 28.9°F (-1.7°C) in January and February to a peak of 84.9°F (29.4°C) in July, then decrease to 28.2°F (-2.1°C) in December. Temperature lows follow a similar pattern, starting at 12.6°F (-10.8°C) in January, rising to 61.3°F (16.3°C) in July, and then dropping again to 12.9°F (-10.6°C) in December. The rainfall ranges from 0.43" (11mm) in January to a high of 1.93" (49mm) in May, before eventually dropping to 0.51" (13mm) in December. Snowfall is common in the winter months from January to April, with an absence of snow from May to September then a slight return in October at 0.47" (12mm).
The relative humidity tends to be higher in the colder months from January to February and from November to December, peaking at 81% and 78%, respectively. Conversely, the driest months are from June to August when the relative humidity drops to 35%. The proportion of daylight hours varies over the course of the year, with the shortest day in December at 9 hours and the longest day in June at 15.4 hours.
The best time to visit Thermopolis
When planning a trip to Thermopolis, consider the season and prevailing weather conditions. Weather-wise, the best time to visit is generally between June and September, when the weather is warmest with high temperatures averaging from 73°F (22.8°C) to 84.9°F (29.4°C). The relative humidity is lowest during these months, resulting in drier and more comfortable conditions, especially for outdoor activities.
The worst time to visit Thermopolis
On the other hand, the least advisable time to visit Thermopolis would be from December to February. During these months, Thermopolis experiences its coldest weather with the lowest temperatures falling to an average of 12.6°F (-10.8°C) to 13.1°F (-10.5°C). Snowfall is also more frequent in these months, ranging from 2.83" (72mm) to 4.57" (116mm). Traveling might become inconvenient due to extreme cold and possible snowy conditions.
Spring weather in Thermopolis
Thermopolis experiences spring from March to May. During these months, the weather begins to warm with temperatures increasing from 44.1°F (6.7°C) in March to 63.5°F (17.5°C) in May. Rainfall is moderately high during spring, peaking at 1.93" (49mm) in May. The relative humidity falls progressively as the spring season advances, with average rates dropping from 65% in March to 51% in May.
Summer weather in Thermopolis
Summer time in Thermopolis spans from June to August. These months are characterized by the warmest temperatures, averaging between 76.5°F (24.7°C) to 84.9°F (29.4°C). Rainfall is relatively low, with an average of less than 1.06" (27mm) throughout summer. The relative humidity drops to its lowest values for the year, reaching 35% from June to August.
Autumn weather in Thermopolis
Autumn falls between September and November in Thermopolis. During these months, the temperature ranges from 73°F (22.8°C) in September to 41.2°F (5.1°C) in November. Rainfall is slightly higher in autumn compared to summer with an average of 0.79" (20mm) in October falling to 0.63" (16mm) in November. The relative humidity starts to rise again, with the average increasing from 38% in September to 64% in November.
Winter weather in Thermopolis
Winter in Thermopolis strikes from December to February. This period is characterized by the coldest temperatures ranging from 12.6°F (-10.8°C) to 29.8°F (-1.2°C). Snow is a common phenomenon during these months, reaching as high as 4.57" (116mm) in February. The relative humidity in winter rises to peak values of 78% to 81%, making these months the most humid throughout the year.
Weather in January
January in Thermopolis, Wyoming, features a chilly and snowy atmosphere, setting the stage for the beginning of the year. The coldest month of winter with an average high temperature of 28.9°F (-1.7°C) and a low around 12.6°F (-10.8°C). Weather in January »
Weather in February
Thermopolis weather in February carries on with the winter pattern seen in January but with a slight increase in temperatures. This change, though relatively small, is a sign of the forthcoming spring season. February presents the highest snowfall in the year, recording 4.57" (116mm) throughout the month. Weather in February »
Weather in March
March initiates a noticeable transition from winter to spring in Thermopolis. The warming trend commences with temperatures starting to climb above freezing, signaling the retreat of the harsh winter. The snowfall amount decreases to 2.95" (75mm), a significant drop compared to the previous month. Weather in March »
Weather in April
Thermopolis in April is a time of further warming and resurgent plant life. The increased average high temperature of 52.9°F (11.6°C) is a clear departure from the cold of the prior months. Rain is more common with April getting 1.34" (34mm) of rainfall over 13.4 days, marking a shift from snowy to rainy conditions. Weather in April »
Weather in May
May ushers in significant changes in the weather of Thermopolis with a considerable jump in temperatures and the official start of the warm season. It is the month with the highest amount of rainfall, at 1.93" (49mm) throughout the year. Weather in May »
Weather in June
June in Thermopolis welcomes the first full month of summer with temperatures soaring and the greenery thriving. Longer daylight hours and bountiful sunshine contribute to a lively environment. June adds a dash of warmth with temperatures hitting the high of 76.5°F (24.7°C) on average, creating favorable conditions for outdoor pursuits. Weather in June »
Weather in July
July is the warmest month in Thermopolis, with temperatures reaching an average high of 84.9°F (29.4°C). Despite the sweltering heat, the level of humidity is relatively low, providing some relief from the intense summer heat. Wyoming's landscape is filled with dramatic contrasts; the green of thriving vegetation starkly contrasts with clear blue skies. Weather in July »
Weather in August
August in Thermopolis continues the warm trend observed in July but cools down slightly as the month progresses. August records limited rainfall, with only 1.02" (26mm) falling on average over a span of 14.5 days. Higher UV levels calls for increased precautions during outdoor activities. Weather in August »
Weather in September
September depicts a beautiful transition from hot summer days to the crisp fall weather in Thermopolis. The beginning hint of cooler days becomes more prominent as the month proceeds, signalling the arrival of autumn. September marks a decline in the rainfall from the summer peak, recording approximately 0.91" (23mm). Weather in September »
Weather in October
October in Thermopolis exhibits the full onset of autumn season with its cooler weather, shorter days, and strikingly colorful trees. Average temperatures have dropped from the warmth of September, symbolizing Thermopolis's step further into fall. Weather in October »
Weather in November
November in Thermopolis witnesses lower temperatures and less daylight, reminding locals and visitors alike of the upcoming winter. The descent of temperatures below freezing marks a significant shift from fall to winter. Audience experiences the first snow of the season approximately 3.74" (95mm) spread across six days in November. Weather in November »
Weather in December
December brings the full wrath of winter to Thermopolis, with cold temperatures, limited daylight and the chance for snowfall. The winter wonderland experienced in this month gets approximately 2.83" (72mm) of snow distributed over roughly ten days. Weather in December »
Updated: Feb 14, 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
What is the most humid month in Thermopolis?
With an average relative humidity of 81%, January is the most humid month.
What is the driest month in Thermopolis?
The month with the least rainfall is January, when the rain falls for 4.3 days and typically collects 0.43" (11mm) of precipitation.
How many days does it rain in Thermopolis?
Throughout the year, in Thermopolis, Wyoming, there are 117.2 rainfall days, and 11.14" (283mm) of precipitation is accumulated.
When does it snow in Thermopolis?
January through May, September through December are months with snowfall in Thermopolis.
How many days does it snow in Thermopolis?
Throughout the year, in Thermopolis, there are 51.2 snowfall days, and 21.3" (541mm) of snow is accumulated.
What are the months with the lowest UV index in Thermopolis?
January through April, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
What is the snowiest month in Thermopolis?
The month with the most snowfall in Thermopolis, Wyoming, is February, when snow falls for 11.1 days and typically aggregates up to 4.57" (116mm) of snow.
What is the month with the least sunshine in Thermopolis?
February has the least sunshine of the year in Thermopolis, with an average of 6.2h of sunshine.
When is Daylight Saving Time (DST) in Thermopolis?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Thermopolis, Wyoming, 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.
What is the rainiest month in Thermopolis?
May is the month with the most rainfall in Thermopolis, Wyoming. Rain falls for 17 days and accumulates 1.93" (49mm) of precipitation.
When it does not snow in Thermopolis?
June through August are months without snowfall.
When are the longest days in Thermopolis?
With an average of 15h and 24min of daylight, June has the longest days of the year.
What is the warmest month in Thermopolis?
July, marked by an average high-temperature of 84.9°F (29.4°C) and a low-temperature of 61.3°F (16.3°C), is the warmest month.
What are the least humid months in Thermopolis?
July and August, with an average relative humidity of 35%, are the least humid months.
What month has the most sunshine in Thermopolis?
With an average of 11.9h of sunshine, July has the most sunshine of the year.
When is the highest UV index in Thermopolis?
With an average maximum UV index of 6, July is the month with the highest UV index.
What time of the year is the coldest in Thermopolis?
December is the month that records the lowest temperatures in Thermopolis, Wyoming, with averages ranging from a high of 28.2°F (-2.1°C) to a low of 12.9°F (-10.6°C).
What is the month with the shortest days in Thermopolis?
The month with the shortest days in Thermopolis is December, with an average of 9h and 0min of daylight.
Average temperature
Thermopolis, WY
The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is December (28.2°F).
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (12.6°F).
Average pressure
Thermopolis, WY
- Average pressure in January:
30.19"Hg - Average pressure in February:
30.13"Hg - Average pressure in March:
30.01"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.91"Hg - Average pressure in June:
29.88"Hg
- Average pressure in July:
29.95"Hg - Average pressure in August:
29.95"Hg - Average pressure in September:
29.97"Hg - Average pressure in October:
30.02"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.17"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed
Thermopolis, WY
- Average wind speed in January:
5mph - Average wind speed in February:
5.2mph - Average wind speed in March:
6.2mph - Average wind speed in April:
7.1mph - Average wind speed in May:
6.8mph - Average wind speed in June:
6.6mph
- Average wind speed in July:
5.8mph - Average wind speed in August:
5.5mph - Average wind speed in September:
5.7mph - Average wind speed in October:
5.9mph - Average wind speed in November:
5.2mph - Average wind speed in December:
5.2mph
The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is January (5mph).
Average humidity
Thermopolis, WY
The month with the highest relative humidity is January (81%).
The months with the lowest relative humidity are July and August (35%).
Average rainfall
Thermopolis, WY
- Average rainfall in January:
0.43" - Average rainfall in February:
0.67" - Average rainfall in March:
0.87" - Average rainfall in April:
1.34" - Average rainfall in May:
1.93" - Average rainfall in June:
0.98"
- Average rainfall in July:
1.06" - Average rainfall in August:
1.02" - Average rainfall in September:
0.91" - Average rainfall in October:
0.79" - Average rainfall in November:
0.63" - Average rainfall in December:
0.51"
The wettest month (with the highest rainfall) is May (1.93").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days
Thermopolis, WY
- Average rainfall days in January:
4.3 days - Average rainfall days in February:
6.3 days - Average rainfall days in March:
10 days - Average rainfall days in April:
13.4 days - Average rainfall days in May:
17 days - Average rainfall days in June:
11.3 days
- Average rainfall days in July:
13 days - Average rainfall days in August:
14.5 days - Average rainfall days in September:
9.4 days - Average rainfall days in October:
8.6 days - Average rainfall days in November:
5.1 days - Average rainfall days in December:
4.3 days
The month with the highest number of rainy days is May (17 days).
The months with the least rainy days are January and December (4.3 days).
Average snowfall
Thermopolis, WY
- Average snowfall in January:
3.07" - Average snowfall in February:
4.57" - Average snowfall in March:
2.95" - Average snowfall in April:
2.76" - Average snowfall in May:
0.31" - Average snowfall in June:
0"
The month with the highest snowfall is February (4.57").
The months with the least snowfall are June, July and August (0").
Average snowfall days
Thermopolis, WY
- Average snowfall days in January:
9.3 days - Average snowfall days in February:
11.1 days - Average snowfall days in March:
6.1 days - Average snowfall days in April:
5.1 days - Average snowfall days in May:
0.7 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0.2 days - Average snowfall days in October:
2.4 days - Average snowfall days in November:
6.5 days - Average snowfall days in December:
9.8 days
The month with the highest number of snowfall days is February (11.1 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight / Average sunshine
Thermopolis, WY
- Average daylight in January:
9h and 2min - Average daylight in February:
10h and 3min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 3min - Average daylight in May:
14h and 4min - Average daylight in June:
15h and 2min
- Average daylight in July:
15h and 1min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 4min - Average daylight in December:
9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in January:
6h and 3min - Average sunshine in February:
6h and 1min - Average sunshine in March:
8h and 4min - Average sunshine in April:
10h and 2min - Average sunshine in May:
10h and 4min - Average sunshine in June:
11h and 5min
- Average sunshine in July:
11h and 5min - Average sunshine in August:
11h and 5min - Average sunshine in September:
10h and 4min - Average sunshine in October:
7h and 0min - Average sunshine in November:
6h and 5min - Average sunshine in December:
6h and 3min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 12min).
Average sunshine days
Thermopolis, WY
- Average sunshine days in January:
20.2 days - Average sunshine days in February:
15 days - Average sunshine days in March:
16.3 days - Average sunshine days in April:
10.8 days - Average sunshine days in May:
10.1 days - Average sunshine days in June:
14.2 days
- Average sunshine days in July:
12.2 days - Average sunshine days in August:
11.7 days - Average sunshine days in September:
17.3 days - Average sunshine days in October:
18.9 days - Average sunshine days in November:
19.1 days - Average sunshine days in December:
20.1 days
The month with the most sunshine days is January (20.2 days).
The month with the least sunshine days is May (10.1 days).
Average UV index
Thermopolis, WY
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, April, November and December (UV index 2).
Average cloud cover
Thermopolis, WY
The month with the most cloud cover is February (Cloud cover 35).
The months with the least cloud cover are July and August (Cloud cover 14).
Average visibility
Thermopolis, WY
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Thermopolis, Wyoming, USA
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