Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
Greycliff's transition into May sees a rise in the average high-temperature, advancing from a frosty 46.6°F (8.1°C) in April to a mild 56.8°F (13.8°C). Nightly temperatures drop to an average low of 37.4°F (3°C) in May.Humidity
In Greycliff, the average relative humidity in May is 67%.Rainfall
The month with the most rainfall in Greycliff is May, when the rain falls for 19.8 days and typically aggregates up to 3.15" (80mm) of precipitation.Snowfall
Months with snowfall in Greycliff are January through May, September through December. May is the last month it regularly snows. During 1.9 snowfall days, in May, Greycliff aggregates 1.3" (33mm) of snow. Throughout the year, there are 67.6 snowfall days, and 38.19" (970mm) of snow is accumulated.Daylight
The average length of the day in May is 14h and 57min.On the first day of the month, sunrise is at 6:05 am and sunset at 8:27 pm. On the last day of May, in Greycliff, sunrise is at 5:32 am and sunset at 9:01 pm MDT.
Sunshine
In Greycliff, Montana, the average sunshine in May is 9.9h.UV index
The average daily maximum UV index in May in Greycliff is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: In May, a regular UV index of 4 translates into these guidelines:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Greycliff in May?
What is the average humidity in May in Greycliff?
What is the wettest month in Greycliff?
How many days does it rain in May in Greycliff?
What is the last month it snows in Greycliff?
What is the average length of the day in May in Greycliff?
When are sunrise and sunset in May in Greycliff?
How long on average sun shines in May in Greycliff?
How high is the UV index in May in Greycliff?
Average temperature in May
Greycliff, MT
- Average high temperature in May: 56.8°F
The warmest month (with the highest average high temperature) is July (78.6°F).
The month with the lowest average high temperature is December (28.4°F).
- Average low temperature in May: 37.4°F
The month with the highest average low temperature is August (52.9°F).
The coldest month (with the lowest average low temperature) is February (15.3°F).
Average pressure in May
Greycliff, MT
- Average pressure in May: 29.93"Hg
The months with the highest atmospheric pressure are January and December (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in May
Greycliff, MT
- Average wind speed in May: 6.8mph
The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest month (with the lowest average wind speed) is July (5.9mph).
Average humidity in May
Greycliff, MT
- Average humidity in May: 67%
The month with the highest relative humidity is February (80%).
The month with the lowest relative humidity is August (47%).
Average rainfall in May
Greycliff, MT
- Average rainfall in May: 3.15"
The wettest month (with the highest rainfall) is May (3.15").
The driest month (with the least rainfall) is January (0.47").
Average rainfall days in May
Greycliff, MT
- Average rainfall days in May: 19.8 days
The month with the highest number of rainy days is May (19.8 days).
The months with the least rainy days are January and December (5.3 days).
Average snowfall in May
Greycliff, MT
- Average snowfall in May: 1.3"
The month with the highest snowfall is March (7.09").
The months with the least snowfall are June, July and August (0").
Average snowfall days in May
Greycliff, MT
- Average snowfall days in May: 1.9 days
The month with the highest number of snowfall days is February (12.9 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in May /
Average sunshine in May
Greycliff, 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: 9h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 12min).
Average sunshine days in May
Greycliff, MT
- Average sunshine days in May: 7.7 days
The month with the most sunshine days is January (19.8 days).
The month with the least sunshine days is May (7.7 days).
Average UV index in May
Greycliff, MT
- Average UV index in May: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in May
Greycliff, MT
- Average cloud cover in May: 36
The month with the most cloud cover is February (Cloud cover 41).
The months with the least cloud cover are July and August (Cloud cover 16).
Average visibility in May
Greycliff, 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).
Greycliff, Montana, USA
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