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
With the onset of May, Heron's average high-temperature experiences a rise, moving from April's frosty 48.7°F (9.3°C) to a comfortable 61.3°F (16.3°C). In Heron, the nighttime chill during May is a clear shift from the day's highs, with an average of 37.9°F (3.3°C).Humidity
The average relative humidity in May is 69%.Rainfall
In May, the rain falls for 17.2 days. Throughout May, 2.4" (61mm) of precipitation is accumulated. In Heron, during the entire year, the rain falls for 161.9 days and collects up to 27.48" (698mm) of precipitation.Snowfall
January through May, September through December are months with snowfall in Heron. May is the last month it regularly snows. During 0.3 snowfall days, in May, Heron aggregates 0.04" (1mm) of snow. Throughout the year, in Heron, there are 80.8 snowfall days, and 60" (1524mm) of snow is accumulated.Daylight
In May, the average length of the day is 15h and 13min.On the first day of the month, sunrise is at 6:23 am and sunset at 8:57 pm. On the last day of May, in Heron, sunrise is at 5:48 am and sunset at 9:35 pm MDT.
Sunshine
The average sunshine in May in Heron is 9.8h.UV index
In Heron, the average daily maximum UV index in May is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: A maximum UV index of 4 in May translates into the following recommendations:
Ensure safety - Sun damage prevention is strongly urged. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Frequently asked questions
What are May temperatures in Heron?
What is the average humidity in May in Heron?
How many days does it rain in May in Heron?
What is the last month it snows in Heron?
How many hours of daylight does Heron have in May?
What time are sunrise and sunset in May in Heron?
How many hours of sunshine does Heron have in May?
What is the UV index intensity in May in Heron?
Average temperature in May
Heron, MT
- Average high temperature in May: 61.3°F
The warmest month (with the highest average high temperature) is August (78.3°F).
The month with the lowest average high temperature is December (29.3°F).
- Average low temperature in May: 37.9°F
The month with the highest average low temperature is August (49.1°F).
The coldest month (with the lowest average low temperature) is December (18.7°F).
Average pressure in May
Heron, MT
- Average pressure in May: 29.95"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The months with the lowest atmospheric pressure are June and August (29.92"Hg).
Average wind speed in May
Heron, MT
- Average wind speed in May: 4.3mph
The windiest month (with the highest average wind speed) is April (4.5mph).
The calmest month (with the lowest average wind speed) is December (3.5mph).
Average humidity in May
Heron, MT
- Average humidity in May: 69%
The month with the highest relative humidity is January (94%).
The month with the lowest relative humidity is August (52%).
Average rainfall in May
Heron, MT
- Average rainfall in May: 2.4"
The wettest month (with the highest rainfall) is December (3.66").
The driest month (with the least rainfall) is August (0.55").
Average rainfall days in May
Heron, MT
- Average rainfall days in May: 17.2 days
The month with the highest number of rainy days is April (19.3 days).
The month with the least rainy days is August (6.9 days).
Average snowfall in May
Heron, MT
- Average snowfall in May: 0.04"
The month with the highest snowfall is January (15.87").
The months with the least snowfall are June, July and August (0").
Average snowfall days in May
Heron, MT
- Average snowfall days in May: 0.3 days
The month with the highest number of snowfall days is December (19.5 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in May /
Average sunshine in May
Heron, MT
- Average daylight in May: 15h and 1min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in May: 9h and 5min
The month with the most sunshine is August (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).
Average sunshine days in May
Heron, MT
- Average sunshine days in May: 11.8 days
The month with the most sunshine days is July (20.9 days).
The month with the least sunshine days is March (7.1 days).
Average UV index in May
Heron, 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, November and December (UV index 1).
Average cloud cover in May
Heron, MT
- Average cloud cover in May: 36
The month with the most cloud cover is January (Cloud cover 67).
The month with the least cloud cover is August (Cloud cover 14).
Average visibility in May
Heron, MT
- Average visibility in May: 6mi
The months with the highest visibility are May, June, July, August and September (6mi).
The months with the lowest visibility are January, February and December (3mi).
Heron, Montana, USA
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