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Contents
- 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
Weather in January
January, the same as December, in Mammoth, Montana, is a freezing cold winter month, with an average temperature ranging between max 28.8°F (-1.8°C) and min 13.6°F (-10.2°C). With the onset of January, a modest change to a still subzero cold 28.8°F (-1.8°C) from December's 26.4°F (-3.1°C) is noted in high-temperature. Weather in January »
Weather in February
February, the last month of the winter in Mammoth, is another freezing cold month, with an average temperature fluctuating between 13.8°F (-10.1°C) and 29.3°F (-1.5°C). Mammoth sees the arrival of February with an average high-temperature of a still subzero cold 29.3°F (-1.5°C), indicating a subtle variation from January. Weather in February »
Weather in March
The first month of the spring, March, is a cold month in Mammoth, Montana, with an average temperature varying between 38.1°F (3.4°C) and 21.9°F (-5.6°C). Mammoth in March experiences a slight uptick in the average high-temperature, adjusting from February's subzero cold 29.3°F (-1.5°C) to an icy 38.1°F (3.4°C). Weather in March »
Weather in April
April in Mammoth, Montana, is a frosty spring month, with an average temperature fluctuating between 27.7°F (-2.4°C) and 46.4°F (8°C). The shift from March to April introduces a subtle increase in the average high-temperature, moving from an icy 38.1°F (3.4°C) to a chilly 46.4°F (8°C). Weather in April »
Weather in May
The last month of the spring, May, is a refreshing month in Mammoth, Montana, with an average temperature ranging between max 58.1°F (14.5°C) and min 35.2°F (1.8°C). Mammoth's transition into May sees a rise in the average high-temperature, advancing from a frosty 46.4°F (8°C) in April to a refreshing 58.1°F (14.5°C). Weather in May »
Weather in June
June, the first month of the summer in Mammoth, is an agreeable month, with temperature in the range of an average low of 41.9°F (5.5°C) and an average high of 68.5°F (20.3°C). With the onset of June, Mammoth's weather sees a temperature rise, transitioning from a refreshing 58.1°F (14.5°C) in May to a pleasant 68.5°F (20.3°C). Weather in June »
Weather in July
July in Mammoth, Montana, is a moderately hot summer month, with temperature in the range of an average low of 47.7°F (8.7°C) and an average high of 79.5°F (26.4°C). The month of July sees the highest average temperatures, reaching 79.5°F (26.4°C) at the peak and 47.7°F (8.7°C) at the low. Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Mammoth, Montana, with an average temperature varying between 78.3°F (25.7°C) and 47.1°F (8.4°C). The commencement of August brings an average high-temperature of a still warm 78.3°F (25.7°C), marking an inconsequential divergence from July. Weather in August »
Weather in September
September, the first month of the autumn in Mammoth, is also an enjoyable month, with an average temperature ranging between min 41.2°F (5.1°C) and max 67.6°F (19.8°C). The onset of September brings a small change in high-temperatures, falling from a moderately hot 78.3°F (25.7°C) in August to a comfortable 67.6°F (19.8°C). Weather in September »
Weather in October
October, like September, in Mammoth, Montana, is another fresh autumn month, with an average temperature varying between 30.9°F (-0.6°C) and 50.7°F (10.4°C). The shift into October is marked by a considerable temperature decrease, with the average high-temperature dropping from an enjoyable 67.6°F (19.8°C) in September to a fresh 50.7°F (10.4°C). Weather in October »
Weather in November
The last month of the autumn, November, is also an icy month in Mammoth, Montana, with an average temperature varying between 20.3°F (-6.5°C) and 36.5°F (2.5°C). Mammoth in November experiences a subtle temperature decline, with average high-temperatures reducing from a cool 50.7°F (10.4°C) in October to a wintry 36.5°F (2.5°C). Weather in November »
Weather in December
The first month of the winter, December, is also a subzero cold month in Mammoth, Montana, with temperature in the range of an average low of 11.3°F (-11.5°C) and an average high of 26.4°F (-3.1°C). The lowest temperatures are recorded in December, with averages reaching a high of 26.4°F (-3.1°C) and a low of 11.3°F (-11.5°C). Weather in December »
Updated: Jun 7, 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?
January is the most humid month, with an average relative humidity of 85%.
What is the driest month?
The month with the least rainfall is January, when the rain falls for 11.7 days and typically collects 0.59" (15mm) of precipitation.
How much does it rain?
Throughout the year, there are 158 rainfall days, and 12.2" (310mm) of precipitation is accumulated.
When does it snow?
Months with snowfall are January through April, October through December.
How many days does it snow in Mammoth?
In Mammoth, during the entire year, snow falls for 20.8 days and aggregates up to 5.12" (130mm) of snow.
What are the months with the lowest UV index in Mammoth?
The months with the lowest UV index in Mammoth are January through April, October through December, with an average maximum UV index of 2.
When does it snow the most?
The month with the most snowfall is February, when snow falls for 6.2 days and typically aggregates up to 1.81" (46mm) of snow.
When is Daylight Saving Time (DST)?
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.
What is the rainiest month?
May is the month with the most rainfall. Rain falls for 18.4 days and accumulates 1.85" (47mm) of precipitation.
When it does not snow?
May through September are months without snowfall.
When are the longest days?
The month with the longest days is June, with an average of 15h and 36min of daylight.
What is the hottest time of year?
In Mammoth, July is the warmest month, with temperatures averaging a high of 79.5°F (26.4°C) and a low of 47.7°F (8.7°C).
What are the least humid months?
The months with the lowest humidity are July and August, with an average relative humidity of 46%.
What month has the most sunshine?
July has the most sunshine of the year, with an average of 11.9h of sunshine.
When is the highest UV index?
July is the month with the highest UV index, with an average maximum UV index of 5.
What part of the year is the coldest?
Mammoth notes the coldest temperatures in December, with a average high of 26.4°F (-3.1°C) and a low of 11.3°F (-11.5°C).
What is the month with the shortest days?
December has the shortest days of the year, with an average of 8h and 48min of daylight.
What is the month with the least sunshine?
December has the least sunshine of the year, with an average of 6h of sunshine.
Average temperature
Mammoth, MT
The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is December (26.4°F).
The month with the highest average low temperature is July (47.7°F).
The coldest month (with the lowest average low temperature) is December (11.3°F).
Average pressure
Mammoth, MT
- Average pressure in January:
30.23"Hg - Average pressure in February:
30.14"Hg - Average pressure in March:
30.05"Hg - Average pressure in April:
29.98"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.98"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
29.99"Hg - Average pressure in October:
30.06"Hg - Average pressure in November:
30.14"Hg - Average pressure in December:
30.22"Hg
The month with the highest atmospheric pressure is January (30.23"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Mammoth, MT
- Average wind speed in January:
6.2mph - Average wind speed in February:
6.1mph - Average wind speed in March:
6.2mph - Average wind speed in April:
6.1mph - Average wind speed in May:
5.4mph - Average wind speed in June:
5.3mph
- Average wind speed in July:
4.8mph - Average wind speed in August:
4.6mph - Average wind speed in September:
5mph - Average wind speed in October:
5.9mph - Average wind speed in November:
6.3mph - Average wind speed in December:
6.1mph
The windiest month (with the highest average wind speed) is November (6.3mph).
The calmest month (with the lowest average wind speed) is August (4.6mph).
Average humidity
Mammoth, MT
The month with the highest relative humidity is January (85%).
The months with the lowest relative humidity are July and August (46%).
Average rainfall
Mammoth, MT
- Average rainfall in January:
0.59" - Average rainfall in February:
0.87" - Average rainfall in March:
0.98" - Average rainfall in April:
1.57" - Average rainfall in May:
1.85" - Average rainfall in June:
1.77"
- Average rainfall in July:
0.67" - Average rainfall in August:
0.63" - Average rainfall in September:
0.98" - Average rainfall in October:
0.87" - Average rainfall in November:
0.71" - Average rainfall in December:
0.71"
The wettest month (with the highest rainfall) is May (1.85").
The driest month (with the least rainfall) is January (0.59").
Average rainfall days
Mammoth, MT
- Average rainfall days in January:
11.7 days - Average rainfall days in February:
12.8 days - Average rainfall days in March:
16.4 days - Average rainfall days in April:
18.6 days - Average rainfall days in May:
18.4 days - Average rainfall days in June:
16.3 days
- Average rainfall days in July:
8.8 days - Average rainfall days in August:
8.6 days - Average rainfall days in September:
10.3 days - Average rainfall days in October:
13.1 days - Average rainfall days in November:
11.1 days - Average rainfall days in December:
11.9 days
The month with the highest number of rainy days is April (18.6 days).
The month with the least rainy days is August (8.6 days).
Average snowfall
Mammoth, MT
The month with the highest snowfall is February (1.81").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Mammoth, MT
- Average snowfall days in January:
4.5 days - Average snowfall days in February:
6.2 days - Average snowfall days in March:
1.6 days - Average snowfall days in April:
1.2 days - Average snowfall days in May:
0 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 days - Average snowfall days in October:
0.5 days - Average snowfall days in November:
2.3 days - Average snowfall days in December:
4.5 days
The month with the highest number of snowfall days is February (6.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Mammoth, MT
- Average daylight in January:
9h and 1min - Average daylight in February:
10h and 2min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 4min - Average daylight in May:
14h and 5min - Average daylight in June:
15h and 4min
- Average daylight in July:
15h and 2min - Average daylight in August:
14h and 1min - Average daylight in September:
12h and 3min - Average daylight in October:
10h and 5min - Average daylight in November:
9h and 3min - Average daylight in December:
8h and 5min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in January:
6h and 1min - Average sunshine in February:
6h and 4min - Average sunshine in March:
8h and 2min - Average sunshine in April:
9h and 5min - Average sunshine in May:
10h and 4min - Average sunshine in June:
11h and 3min
- Average sunshine in July:
11h and 5min - Average sunshine in August:
11h and 4min - Average sunshine in September:
9h and 5min - Average sunshine in October:
7h and 2min - Average sunshine in November:
6h and 4min - Average sunshine in December:
6h and 0min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).
Average sunshine days
Mammoth, MT
- Average sunshine days in January:
14.8 days - Average sunshine days in February:
10.8 days - Average sunshine days in March:
11.6 days - Average sunshine days in April:
7.8 days - Average sunshine days in May:
9.1 days - Average sunshine days in June:
10.7 days
- Average sunshine days in July:
17.8 days - Average sunshine days in August:
17.3 days - Average sunshine days in September:
16.4 days - Average sunshine days in October:
15.8 days - Average sunshine days in November:
15.7 days - Average sunshine days in December:
14.8 days
The month with the most sunshine days is July (17.8 days).
The month with the least sunshine days is April (7.8 days).
Average UV index
Mammoth, MT
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover
Mammoth, MT
The month with the most cloud cover is February (Cloud cover 42).
The months with the least cloud cover are July and August (Cloud cover 14).
Average visibility
Mammoth, MT
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
Mammoth, Montana, USA
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