Climate and monthly weather forecast
Harrison, MT

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Weather in January

January, the same as December, in Harrison, Montana, is another subzero cold winter month, with an average temperature varying between 13.8°F (-10.1°C) and 30.2°F (-1°C). Harrison's shift into January sets the average high-temperature at a still subzero cold 30.2°F (-1°C), a figure that deviates only slightly from December's 28°F (-2.2°C). Weather in January »

Weather in February

February, the last month of the winter in Harrison, is another freezing cold month, with temperature in the range of an average low of 14.4°F (-9.8°C) and an average high of 30.9°F (-0.6°C). February's beginning signals an average high-temperature of a still subzero cold 30.9°F (-0.6°C), barely different from January's 30.2°F (-1°C). Weather in February »

Weather in March

March, the first month of the spring in Harrison, is an icy month, with temperature in the range of an average high of 41°F (5°C) and an average low of 24.1°F (-4.4°C). An increase in the average high-temperature marks March, moving from February's freezing cold 30.9°F (-0.6°C) to an icy 41°F (5°C). Weather in March »

Weather in April

April in Harrison, Montana, is a fresh spring month, with an average temperature varying between 50.4°F (10.2°C) and 30.4°F (-0.9°C). Entering April, Harrison sees a temperature rise, with the average high-temperature advancing from March's wintry 41°F (5°C) to a fresh 50.4°F (10.2°C). Weather in April »

Weather in May

The last month of the spring, May, is a refreshing month in Harrison, Montana, with an average temperature fluctuating between 62.6°F (17°C) and 37.9°F (3.3°C). The transition from April to May brings a temperature rise, with average high-temperatures increasing from a fresh 50.4°F (10.2°C) to a refreshing 62.6°F (17°C). Weather in May »

Weather in June

The first month of the summer, June, is an agreeable month in Harrison, Montana, with an average temperature fluctuating between 44.4°F (6.9°C) and 72.9°F (22.7°C). With the onset of June, Harrison sees a temperature rise, with the average high-temperature moving from May's refreshing 62.6°F (17°C) to a pleasant 72.9°F (22.7°C). Weather in June »

Weather in July

July in Harrison, Montana, is a warm summer month, with an average temperature fluctuating between 83.5°F (28.6°C) and 50.2°F (10.1°C). July, marked by an average high-temperature of 83.5°F (28.6°C) and a low-temperature of 50.2°F (10.1°C), is the warmest month. In July, the average heat index is appraised at 84.2°F (29°C). Weather in July »

Weather in August

The last month of the summer, August, is another warm month in Harrison, Montana, with an average temperature fluctuating between 50.5°F (10.3°C) and 81.9°F (27.7°C). The beginning of August reveals an average high-temperature of a still moderately hot 81.9°F (27.7°C), showing minimal deviation from the previous month. Weather in August »

Weather in September

The first month of the autumn, September, is still a pleasant month in Harrison, Montana, with temperature in the range of an average high of 70.9°F (21.6°C) and an average low of 44.4°F (6.9°C). September comes with a drop in the average high-temperature, falling from August's moderately hot 81.9°F (27.7°C) to a pleasant 70.9°F (21.6°C). Weather in September »

Weather in October

October, the same as September, is a cool autumn month in Harrison, Montana, with temperature in the range of an average high of 53.8°F (12.1°C) and an average low of 33.4°F (0.8°C). The shift into October is marked by a considerable temperature decrease, with the average high-temperature dropping from a pleasant 70.9°F (21.6°C) in September to a cool 53.8°F (12.1°C). Weather in October »

Weather in November

November, the last month of the autumn in Harrison, is another cold month, with an average temperature fluctuating between 22.5°F (-5.3°C) and 39°F (3.9°C). As Harrison, Montana, welcomes November, there is a noticeable shift in the average high-temperature, dropping from October's cool 53.8°F (12.1°C) to a wintry 39°F (3.9°C). Weather in November »

Weather in December

The first month of the winter, December, is still a freezing cold month in Harrison, Montana, with an average temperature varying between 12.7°F (-10.7°C) and 28°F (-2.2°C). Harrison reaches its lowest average temperatures in December, measuring 28°F (-2.2°C) at the peak and 12.7°F (-10.7°C) at the lowest. Weather in December »
Updated: Aug 23, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the most humid month?

With an average relative humidity of 85%, January is the most humid month in Harrison.

How much does it rain?

In Harrison, during the entire year, the rain falls for 134.2 days and collects up to 11.34" (288mm) of precipitation.

When does it snow?

Months with snowfall are January through June, September through December.

How much does it snow?

In Harrison, during the entire year, snow falls for 79.6 days and aggregates up to 30.08" (764mm) of snow.

What is the month with the least sunshine?

January has the least sunshine of the year, with an average of 5.9h of sunshine.

When does it snow the most?

February is the month with the most snowfall. Snow falls for 16.5 days and accumulates 6.02" (153mm) of snow.

When is Daylight Saving Time (DST)?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from MST to MDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from MDT to MST.

What is the wettest month in Harrison?

June is the month with the most rainfall. Rain falls for 13.5 days and accumulates 1.57" (40mm) of precipitation.

When are the longest days?

The month with the longest days is June, with an average of 15h and 42min of daylight.

What time of the year is the hottest in Harrison?

July is the month that records the highest temperatures, with averages ranging from a high of 83.5°F (28.6°C) to a low of 50.2°F (10.1°C).

When it does not snow in Harrison?

July and August are months without snowfall.

What month has the most sunshine?

With an average of 11.8h of sunshine, July has the most sunshine of the year.

What is the month with the highest UV index?

July is the month with the highest UV index, with an average maximum UV index of 6.

What is the least humid month?

August is the least humid month in Harrison, with an average relative humidity of 44%.

What is the driest month?

The month with the least rainfall is August, when the rain falls for 7.6 days and typically collects 0.51" (13mm) of precipitation.

What is the coldest time of year?

The month of December sees the average lowest temperatures, reaching 28°F (-2.2°C) at the peak and 12.7°F (-10.7°C) at the low.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 8h and 48min of daylight.

What is the month with the lowest UV index?

The month with the lowest UV index is December, with an average maximum UV index of 1.

Average temperature
Harrison, MT

Average temperature - Harrison, MT

The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is December (28°F).

The month with the highest average low temperature is August (50.5°F).
The coldest month (with the lowest average low temperature) is December (12.7°F).

Average pressure
Harrison, MT

Average pressure - Harrison, MT

The months with the highest atmospheric pressure are January and December (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

Average wind speed
Harrison, MT

Average wind speed - Harrison, MT

The windiest month (with the highest average wind speed) is April (5.5mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).

Average humidity
Harrison, MT

Average humidity - Harrison, MT

The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (44%).

Average rainfall
Harrison, MT

Average rainfall - Harrison, MT

The wettest month (with the highest rainfall) is June (1.57").
The driest month (with the least rainfall) is August (0.51").

Average rainfall days
Harrison, MT

Average rainfall days - Harrison, MT

The month with the highest number of rainy days is April (16.5 days).
The month with the least rainy days is August (7.6 days).

Average snowfall
Harrison, MT

Average snowfall - Harrison, MT

The month with the highest snowfall is February (6.02").
The months with the least snowfall are July and August (0").

Average snowfall days
Harrison, MT

Average snowfall days - Harrison, MT

The month with the highest number of snowfall days is February (16.5 days).
The months with the least snowfall days are July and August (0 days).

Average daylight / Average sunshine
Harrison, MT

Average daylight / Average sunshine - Harrison, MT

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 48min).

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 5h and 54min).

Average sunshine days
Harrison, MT

Average sunshine days - Harrison, MT

The month with the most sunshine days is September (18.7 days).
The month with the least sunshine days is April (9.3 days).

Average visibility
Harrison, MT

Average visibility - Harrison, MT

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

Harrison, Montana, USA

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