May weather forecast
Halfmoon, MT

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Weather in May

The last month of the spring, May, is a refreshing month in Halfmoon, Montana, with an average temperature fluctuating between 35.2°F (1.8°C) and 59.5°F (15.3°C).

Temperature

May shows a rise in the average high-temperature, moving from April's frosty 46.6°F (8.1°C) to a moderate 59.5°F (15.3°C). Halfmoon undergoes a major shift from daytime highs, averaging a cold 35.2°F (1.8°C) during the night in May.

Humidity

The average relative humidity in May is 68%.

Rainfall

In Halfmoon, in May, it is raining for 13.8 days, with typically 1.1" (28mm) of accumulated precipitation. Throughout the year, in Halfmoon, there are 126.4 rainfall days, and 11.22" (285mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall. May is the last month it regularly snows in Halfmoon, Montana. During 1.5 snowfall days, in May, Halfmoon aggregates 0.55" (14mm) of snow. In Halfmoon, during the entire year, snow falls for 97 days and aggregates up to 33.86" (860mm) of snow.

Daylight

The average length of the day in May is 15h and 15min.
On the first day of May, sunrise is at 6:16 am and sunset at 8:51 pm. On the last day of the month, sunrise is at 5:39 am and sunset at 9:29 pm MDT.

Sunshine

In May, the average sunshine in Halfmoon is 10.4h.

UV index

The average daily maximum UV index in May is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.
Note: In May, the maximum UV index of 4 suggests these recommendations:
Take precautions - Protection against sun damage is advised. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
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Frequently asked questions

What is the average May temperature in Halfmoon?

The high-temperature during May is 59.5°F (15.3°C) and the low-temperature is 35.2°F (1.8°C).

What is the average humidity in May in Halfmoon?

The average relative humidity in May in Halfmoon is 68%.

How many days does it rain in May in Halfmoon?

In Halfmoon, Montana, in May, it is raining for 13.8 days, with typically 1.1" (28mm) of accumulated precipitation.

What is the last month it snows in Halfmoon?

May is the last month it regularly snows in Halfmoon, Montana. During 1.5 snowfall days, in May, Halfmoon aggregates 0.55" (14mm) of snow.

What is the average length of the day in May in Halfmoon?

In May, the average day length in Halfmoon, Montana, is 15h and 15min.

When are sunrise and sunset in May in Halfmoon?

On the first day of May in Halfmoon, sunrise is at 6:16 am and sunset at 8:51 pm. On the last day of the month, sunrise is at 5:39 am and sunset at 9:29 pm MDT.

How long on average sun shines in May in Halfmoon?

In Halfmoon, the average sunshine duration in May is 10.4h.

What is the UV index intensity in May in Halfmoon?

The average daily maximum UV index in May is 4. A UV Index reading of 3 to 5 represents a medium health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Halfmoon, MT

Average temperature in May - Halfmoon, MT
  • Average high temperature in May: 59.5°F

The warmest month (with the highest average high temperature) is July (77.9°F).
The month with the lowest average high temperature is December (25.7°F).

  • Average low temperature in May: 35.2°F

The month with the highest average low temperature is August (45.5°F).
The coldest month (with the lowest average low temperature) is February (13.5°F).

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Average pressure in May
Halfmoon, MT

Average pressure in May - Halfmoon, MT
  • Average pressure in May: 29.96"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in May
Halfmoon, MT

Average wind speed in May - Halfmoon, MT
  • Average wind speed in May: 4.4mph

The windiest month (with the highest average wind speed) is April (4.6mph).
The calmest months (with the lowest average wind speed) are August and December (3.7mph).

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Average humidity in May
Halfmoon, MT

Average humidity in May - Halfmoon, MT
  • Average humidity in May: 68%

The month with the highest relative humidity is January (93%).
The month with the lowest relative humidity is August (55%).

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Average rainfall in May
Halfmoon, MT

Average rainfall in May - Halfmoon, MT
  • Average rainfall in May: 1.1"

The wettest month (with the highest rainfall) is June (1.42").
The driest month (with the least rainfall) is August (0.43").

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Average rainfall days in May
Halfmoon, MT

Average rainfall days in May - Halfmoon, MT
  • Average rainfall days in May: 13.8 days

The month with the highest number of rainy days is April (15.8 days).
The month with the least rainy days is August (6.3 days).

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Average snowfall in May
Halfmoon, MT

Average snowfall in May - Halfmoon, MT
  • Average snowfall in May: 0.55"

The month with the highest snowfall is January (7.72").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in May
Halfmoon, MT

Average snowfall days in May - Halfmoon, MT
  • Average snowfall days in May: 1.5 days

The month with the highest number of snowfall days is December (19.1 days).
The months with the least snowfall days are July and August (0 days).

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Average daylight in May /
Average sunshine in May
Halfmoon, MT

Average daylight in May / Average sunshine in May - Halfmoon, 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: 10h and 2min

The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).

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Average sunshine days in May
Halfmoon, MT

Average sunshine days in May - Halfmoon, MT
  • Average sunshine days in May: 14.2 days

The month with the most sunshine days is July (21.5 days).
The month with the least sunshine days is March (7.7 days).

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Average UV index in May
Halfmoon, MT

Average UV index in May - Halfmoon, 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).

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Average cloud cover in May
Halfmoon, MT

Average cloud cover in May - Halfmoon, MT
  • Average cloud cover in May: 33

The month with the most cloud cover is January (Cloud cover 65).
The months with the least cloud cover are July and August (Cloud cover 15).

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Average visibility in May
Halfmoon, MT

Average visibility in May - Halfmoon, MT
  • Average visibility in May: 6mi

The months with the highest visibility are May, June, July, August, September and October (6mi).
The month with the lowest visibility is January (3mi).

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Halfmoon, Montana, USA

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