May weather forecast
Hamilton, MT

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A strong suspension bridge over a fast river in Hamilton, Montana, overlooking scenic trees and hilly landscapes over the other side of the shore
A strong suspension bridge over a fast river in Hamilton, Montana, overlooking scenic trees and hilly landscapes over the other side of the shore

Weather in May

May signals the onset of warmer temperatures, an increase in daylight and sunshine hours, and a further decline in snowfall. Hinting at the arrival of summer, snowfall dwindles from 5.67" (144mm) in April to a bare minimum 0.67" (17mm). May emerges as warm, with consistent rainfall, providing an ideal climate for plant growth. With the creeping up of temperatures, Hamilton begins to welcome summertime during this month. Hamilton's residents and visitors can look forward to clearer skies and longer days, turning the city into a bustling hub of activities.

Temperature

Hamilton's transition into May is marked by a temperature shift, moving from a frosty 43.5°F (6.4°C) in April to a refreshing 56.7°F (13.7°C). Hamilton documents a significant temperature variance in May, with the mean nighttime lows settling at a wintry 33.4°F (0.8°C).

Humidity

In Hamilton, the average relative humidity in May is 71%.

Rainfall

In Hamilton, in May, during 19.5 rainfall days, 1.97" (50mm) of precipitation is typically accumulated. In Hamilton, during the entire year, the rain falls for 163.6 days and collects up to 20.83" (529mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall. May is the last month it regularly snows in Hamilton, Montana. During 2.3 snowfall days, in May, Hamilton aggregates 0.67" (17mm) of snow. In Hamilton, during the entire year, snow falls for 101.1 days and aggregates up to 59.17" (1503mm) of snow.

Daylight

In Hamilton, Montana, the average length of the day in May is 15h and 1min.
On the first day of the month, sunrise is at 6:21 am and sunset at 8:45 pm. On the last day of May, in Hamilton, sunrise is at 5:48 am and sunset at 9:20 pm MDT.

Sunshine

In May, the average sunshine is 10.4h.

UV index

In May, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for average individuals.
Note: A maximum daily UV index of 4 during May morphs into the following directions:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
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Frequently asked questions

What is the usual temperature for Hamilton in May?

In Hamilton, 56.7°F (13.7°C) is the average high-temperature and 33.4°F (0.8°C) is the average low-temperature during May.

What is the average humidity in May in Hamilton?

The average relative humidity in May in Hamilton is 71%.

How many days does it rain in May in Hamilton?

In Hamilton, during May, the rain falls for 19.5 days and regularly aggregates up to 1.97" (50mm) of precipitation.

What is the last month it snows in Hamilton?

May is the last month it regularly snows in Hamilton. During 2.3 snowfall days, in May, Hamilton aggregates 0.67" (17mm) of snow.

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

In May, the average day length in Hamilton, Montana, is 15h and 1min.

What time are sunrise and sunset in May in Hamilton?

On the first day of May in Hamilton, sunrise is at 6:21 am and sunset at 8:45 pm. On the last day of the month, sunrise is at 5:48 am and sunset at 9:20 pm MDT.

How many hours of sunshine does Hamilton have in May?

The average sunshine duration in May in Hamilton is 10.4h.

What is the UV index intensity in May in Hamilton?

In May, the average daily maximum UV index in Hamilton is 4. A UV Index reading of 3 to 5 represents a moderate health threat from exposure to Sun's UV rays.
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
Hamilton, MT

Average temperature in May - Hamilton, MT
  • Average high temperature in May: 56.7°F

The warmest month (with the highest average high temperature) is July (77°F).
The month with the lowest average high temperature is December (26.8°F).

  • Average low temperature in May: 33.4°F

The month with the highest average low temperature is August (46.9°F).
The coldest month (with the lowest average low temperature) is December (14°F).

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Average pressure in May
Hamilton, MT

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

The month with the highest atmospheric pressure is January (30.21"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in May
Hamilton, MT

Average wind speed in May - Hamilton, MT
  • Average wind speed in May: 4.5mph

The windiest month (with the highest average wind speed) is January (5.3mph).
The calmest month (with the lowest average wind speed) is August (4.1mph).

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Average humidity in May
Hamilton, MT

Average humidity in May - Hamilton, MT
  • Average humidity in May: 71%

The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is August (50%).

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Average rainfall in May
Hamilton, MT

Average rainfall in May - Hamilton, MT
  • Average rainfall in May: 1.97"

The wettest months (with the highest rainfall) are February and April (2.36").
The driest month (with the least rainfall) is August (0.75").

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Average rainfall days in May
Hamilton, MT

Average rainfall days in May - Hamilton, MT
  • Average rainfall days in May: 19.5 days

The month with the highest number of rainy days is May (19.5 days).
The month with the least rainy days is July (8 days).

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Average snowfall in May
Hamilton, MT

Average snowfall in May - Hamilton, MT
  • Average snowfall in May: 0.67"

The month with the highest snowfall is February (13.03").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in May
Hamilton, MT

Average snowfall days in May - Hamilton, MT
  • Average snowfall days in May: 2.3 days

The month with the highest number of snowfall days is February (19.3 days).
The months with the least snowfall days are June, July and August (0 days).

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

Average daylight in May / Average sunshine in May - Hamilton, 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 2min

The months with the most sunshine are July and August (Average sunshine: 11h and 42min).
The months with the least sunshine are January and December (Average sunshine: 5h and 24min).

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Average sunshine days in May
Hamilton, MT

Average sunshine days in May - Hamilton, MT
  • Average sunshine days in May: 8.5 days

The month with the most sunshine days is July (18.9 days).
The month with the least sunshine days is February (5.6 days).

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Average UV index in May
Hamilton, MT

Average UV index in May - Hamilton, MT
  • Average UV index in May: 4

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are February and December (UV index 1).

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Average cloud cover in May
Hamilton, MT

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

The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 13).

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Average visibility in May
Hamilton, MT

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

The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March and December (4mi).

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Hamilton, Montana, USA

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