May weather forecastPompeys Pillar, MT
May
Weather in May
The last month of the spring, May, is an enjoyable month in Pompeys Pillar, Montana, with an average temperature fluctuating between 45.5°F (7.5°C) and 65.8°F (18.8°C).Temperature
The transition to May introduces an increase in the average high-temperature, shifting from a fresh 55°F (12.8°C) in April to a comfortable 65.8°F (18.8°C). During the May nights, an average temperature of 45.5°F (7.5°C) is observed.Humidity
In Pompeys Pillar, the average relative humidity in May is 57%.Rainfall
May is the month with the most rainfall. Rain falls for 13.6 days and accumulates 1.81" (46mm) of precipitation.Snowfall
Months with snowfall are January through May, September through December. May is the last month it regularly snows. During 0.5 snowfall days, in May, Pompeys Pillar aggregates 0.2" (5mm) of snow. Throughout the year, in Pompeys Pillar, there are 56.7 snowfall days, and 25.16" (639mm) of snow is accumulated.Daylight
In Pompeys Pillar, the average length of the day in May is 14h and 59min.On the first day of May, sunrise is at 5:57 am and sunset at 8:20 pm. On the last day of the month, sunrise is at 5:24 am and sunset at 8:54 pm MDT.
Sunshine
In May, the average sunshine is 10.2h.UV index
In Pompeys Pillar, the average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for average individuals.Note: In May, the maximum UV index of 5 suggests these recommendations:
Heed the precautions - Suggestions to avoid sunburn are made. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Pompeys Pillar, MT
- Average high temperature in May: 65.8°F
The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is December (31.3°F).
- Average low temperature in May: 45.5°F
The month with the highest average low temperature is July (62.8°F).
The coldest month (with the lowest average low temperature) is January (17.8°F).
Average pressure in May
Pompeys Pillar, MT
- Average pressure in May: 29.91"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in May
Pompeys Pillar, MT
- Average wind speed in May: 8.9mph
The windiest month (with the highest average wind speed) is April (9.1mph).
The calmest month (with the lowest average wind speed) is July (7.3mph).
Average humidity in May
Pompeys Pillar, MT
- Average humidity in May: 57%
The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is August (38%).
Average rainfall in May
Pompeys Pillar, MT
- Average rainfall in May: 1.81"
The wettest month (with the highest rainfall) is May (1.81").
The driest month (with the least rainfall) is August (0.63").
Average rainfall days in May
Pompeys Pillar, MT
- Average rainfall days in May: 13.6 days
The month with the highest number of rainy days is May (13.6 days).
The month with the least rainy days is December (5.9 days).
Average snowfall in May
Pompeys Pillar, MT
- Average snowfall in May: 0.2"
The month with the highest snowfall is February (5.43").
The months with the least snowfall are June, July and August (0").
Average snowfall days in May
Pompeys Pillar, MT
- Average snowfall days in May: 0.5 days
The month with the highest number of snowfall days is February (12.5 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in May /
Average sunshine in May
Pompeys Pillar, MT
- Average daylight in May: 15h and 0min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in May: 10h and 12min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 36min).
Average sunshine days in May
Pompeys Pillar, MT
- Average sunshine days in May: 14.4 days
The month with the most sunshine days is September (21.5 days).
The month with the least sunshine days is February (13.3 days).
Average UV index in May
Pompeys Pillar, MT
- Average UV index in May: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in May
Pompeys Pillar, MT
- Average cloud cover in May: 33
The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is July (Cloud cover 13).
Average visibility in May
Pompeys Pillar, MT
- Average visibility in May: 6mi
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).
