May weather forecast
Sidney, MT

Weather in May

May, the last month of the spring, in Sidney, is an enjoyable month, with average temperature varying between 46.8°F (8.2°C) and 65.3°F (18.5°C).

Temperature

In May, the average high-temperature rises, from a fresh 52.5°F (11.4°C) in April, to a comfortable 65.3°F (18.5°C). The average low-temperature, in Sidney, is 46.8°F (8.2°C).

Humidity

In Sidney, Montana, the average relative humidity in May is 56%.

Rainfall

In Sidney, in May, it is raining for 10.9 days, with typically 1.22" (31mm) of accumulated precipitation. In Sidney, during the entire year, the rain falls for 85.7 days and collects up to 8.5" (216mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Sidney. May is the last month it regularly snows. During 0.3 snowfall days, in May, Sidney aggregates 0.12" (3mm) of snow. In Sidney, during the entire year, snow falls for 56.1 days, and aggregates up to 8.94" (227mm) of snow.

Daylight

In Sidney, Montana, the average length of the day in May is 15.2h.

Sunshine

The average sunshine in May is 10h.

UV index

In May, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 5 transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in May in Sidney?

In May, the average relative humidity is 56%.

How many days does it rain in May in Sidney?

In Sidney, Montana, during May, the rain falls for 10.9 days and regularly aggregates up to 1.22" (31mm) of precipitation.

What is the last month it snows in Sidney?

May is the last month it regularly snows. During 0.3 snowfall days, in May, Sidney aggregates 0.12" (3mm) of snow.

How many hours of daylight does Sidney have in May?

In Sidney, Montana, the average length of the day in May is 15.2h.

How many hours of sunshine does Sidney have in May?

In May, the average sunshine is 10h.

How high is the UV index in May in Sidney?

In May, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate health threat from unsafe exposure to the Sun's UV rays.

Average temperature in May
Sidney, MT

Average temperature in May - Sidney, MT
  • Average high temperature in May: 18.5°C

The warmest month (with the highest average high temperature) is July (29°C).
The month with the lowest average high temperature is January (-4.8°C).

  • Average low temperature in May: 8.2°C

The month with the highest average low temperature is July (17.2°C).
The coldest month (with the lowest average low temperature) is January (-12.3°C).

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Average pressure in May
Sidney, MT

Average pressure in May - Sidney, MT
  • Average pressure in May: 1013.1mbar

The month with the highest atmospheric pressure is February (1021.5mbar).
The month with the lowest atmospheric pressure is June (1010.3mbar).

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Average wind speed in May
Sidney, MT

Average wind speed in May - Sidney, MT
  • Average wind speed in May: 16.7km/h

The windiest month (with the highest average wind speed) is April (17.9km/h).
The calmest month (with the lowest average wind speed) is February (14.8km/h).

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Average humidity in May
Sidney, MT

Average humidity in May - Sidney, MT
  • Average humidity in May: 56%

The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is August (45%).

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Average rainfall in May
Sidney, MT

Average rainfall in May - Sidney, MT
  • Average rainfall in May: 31mm

The wettest month (with the highest rainfall) is July (34mm).
The driest month (with the least rainfall) is January (6mm).

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Average rainfall days in May
Sidney, MT

Average rainfall days in May - Sidney, MT
  • Average rainfall days in May: 10.9 days

The month with the highest number of rainy days is June (11.4 days).
The months with the least rainy days are January and February (3.2 days).

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Average snowfall in May
Sidney, MT

Average snowfall in May - Sidney, MT
  • Average snowfall in May: 3mm

The month with the highest snowfall is February (45mm).
The months with the least snowfall are June, July, August and September (0mm).

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Average snowfall days in May
Sidney, MT

Average snowfall days in May - Sidney, MT
  • Average snowfall days in May: 0.3 days

The month with the highest number of snowfall days is February (12 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in May / Average sunshine in May - Sidney, MT
  • Average daylight in May: 15.2h

The month with the longest days is June (Average daylight: 15.9h).
The month with the shortest days is December (Average daylight: 8.5h).

  • Average sunshine in May: 10h

The month with the most sunshine is July (Average sunshine: 11.7h).
The month with the least sunshine is February (Average sunshine: 4.3h).

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Average sunshine days in May
Sidney, MT

Average sunshine days in May - Sidney, MT
  • Average sunshine days in May: 16.8 days

The month with the most sunshine days is September (20.7 days).
The month with the least sunshine days is April (15.8 days).

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Average UV index in May
Sidney, MT

Average UV index in May - Sidney, 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 and February (UV index 1).

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Average cloud cover in May
Sidney, MT

Average cloud cover in May - Sidney, MT
  • Average cloud cover in May: 34

The month with the most cloud cover is February (Cloud cover 54).
The month with the least cloud cover is July (Cloud cover 18).

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Average visibility in May
Sidney, MT

Average visibility in May - Sidney, MT
  • Average visibility in May: 10km

The months with the highest visibility are May, June, July, August, September and October (10km).
The months with the lowest visibility are January, February, March, April, November and December (9km).

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