Monthly weather forecast and climate
Heron, MT

January, like December, is another subzero cold winter month in Heron, Montana, with average temperature fluctuating between 30.7°F (-0.7°C) and 19.6°F (-6.9°C). In January, the average high-temperature is essentially the same as in December - a still freezing cold 30.7°F (-0.7°C). Weather in January »

February, the last month of the winter, in Heron, is a cold month, with average temperature varying between 32°F (0°C) and 19.8°F (-6.8°C). In February, the average high-temperature is essentially the same as in January - a wintry 32°F (0°C). Weather in February »

The first month of the spring, March, is also a wintry month in Heron, Montana, with average temperature varying between 24.8°F (-4°C) and 39.2°F (4°C). In March, the average high-temperature slightly increases, from a cold 32°F (0°C) in February, to a still wintry 39.2°F (4°C). Weather in March »

April is a chilly spring month in Heron, Montana, with average temperature ranging between min 30.6°F (-0.8°C) and max 48.7°F (9.3°C). In Heron, the average high-temperature increases, from a wintry 39.2°F (4°C) in March, to a chilly 48.7°F (9.3°C). Weather in April »

The last month of the spring, May, is a comfortable month in Heron, Montana, with average temperature ranging between min 37.9°F (3.3°C) and max 61.3°F (16.3°C). In Heron, the average high-temperature in May increases, from a chilly 48.7°F (9.3°C) in April, to a comfortable 61.3°F (16.3°C). Weather in May »

The first month of the summer, June, is also an enjoyable month in Heron, Montana, with temperature in the range of an average low of 43°F (6.1°C) and an average high of 66.7°F (19.3°C). In Heron, the average high-temperature in June slightly increases, from 61.3°F (16.3°C) in May, to a still comfortable 66.7°F (19.3°C). Weather in June »

July in Heron, Montana, is a moderately hot summer month, with average temperature fluctuating between 48.7°F (9.3°C) and 77.7°F (25.4°C). In Heron, the average high-temperature rises, from a comfortable 66.7°F (19.3°C) in June, to a warm 77.7°F (25.4°C). Weather in July »

The last month of the summer, August, is also a moderately hot month in Heron, Montana, with average temperature fluctuating between 49.1°F (9.5°C) and 78.3°F (25.7°C). August is the warmest month, with an average high-temperature of 78.3°F (25.7°C) and an average low-temperature of 49.1°F (9.5°C). Weather in August »

September, the first month of the autumn, in Heron, is also an enjoyable month, with average temperature fluctuating between 41.7°F (5.4°C) and 67.8°F (19.9°C). In September, the average high-temperature decreases, from a warm 78.3°F (25.7°C) in August, to a comfortable 67.8°F (19.9°C). Weather in September »

October, like September, in Heron, Montana, is a cool autumn month, with temperature in the range of an average high of 51.1°F (10.6°C) and an average low of 33.3°F (0.7°C). In October, the average high-temperature plummets, from an enjoyable 67.8°F (19.9°C) in September, to a cool 51.1°F (10.6°C). Weather in October »

November, the last month of the autumn, in Heron, is another cold month, with average temperature varying between 37.8°F (3.2°C) and 26.4°F (-3.1°C). In Heron, the average high-temperature in November decreases, from a fresh 51.1°F (10.6°C) in October, to a wintry 37.8°F (3.2°C). Weather in November »

December, the first month of the winter, in Heron, is also a subzero cold month, with temperature in the range of an average high of 29.3°F (-1.5°C) and an average low of 18.7°F (-7.4°C). December is the coldest month, with an average high-temperature of 29.3°F (-1.5°C) and an average low-temperature of 18.7°F (-7.4°C). Weather in December »

What is the most humid month in Heron?

The most humid month is January, with an average relative humidity of 94%.

How much does it rain in Heron?

In Heron, during the entire year, the rain falls for 161.9 days and collects up to 27.48" (698mm) of precipitation.

When does it snow in Heron?

January through May, September through December are months with snowfall.

How many days does it snow in Heron?

Throughout the year, there are 80.8 snowfall days, and 60" (1524mm) of snow is accumulated.

What is the snowiest month in Heron?

The month with the most snowfall in Heron, Montana, is January when snow falls for 15.9 days and typically aggregates up to 15.87" (403mm) of snow.

What is the month with the least sunshine in Heron?

With an average of 3.2h of sunshine, January has the least sunshine of the year.

What are the months with the lowest UV index in Heron?

January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index.

When it does not snow in Heron?

In Heron, Montana, snow does not fall in June through August.

When are the longest days in Heron?

With an average of 16h of daylight, June has the longest days of the year in Heron, Montana.

When is the highest UV index in Heron?

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

What is the warmest month in Heron?

The warmest month in Heron is August, with an average high-temperature of 78.3°F (25.7°C) and an average low-temperature of 49.1°F (9.5°C).

What is the least humid month in Heron?

August is the least humid month in Heron, with an average relative humidity of 52%.

What is the driest month in Heron?

August is the month with the least rainfall in Heron, Montana. Rain falls for 6.9 days and accumulates 0.55" (14mm) of precipitation.

What month has the most sunshine in Heron?

With an average of 11.8h of sunshine, August has the most sunshine of the year in Heron.

What is the coldest month in Heron?

December is the coldest month in Heron, with an average high-temperature of 29.3°F (-1.5°C) and an average low-temperature of 18.7°F (-7.4°C).

What is the wettest month in Heron?

The month with the most rainfall is December when the rain falls for 11.2 days and typically aggregates up to 3.66" (93mm) of precipitation.

What is the month with the shortest days in Heron?

December has the shortest days of the year in Heron, Montana, with an average of 8.5h of daylight.
Average temperature - Heron, MT
Average pressure - Heron, MT

The month with the highest atmospheric pressure is January (30.19").
Months with the lowest atmospheric pressure are June and August (29.92").

Average wind speed - Heron, MT

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 rainfall - Heron, MT

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 - Heron, MT

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 - Heron, MT
Average snowfall days - Heron, MT

The month with the highest number of snowfall days is December (19.5 days).
Months with the least snowfall days are June, July and August (0 days).

Average daylight / Average sunshine - Heron, MT

The month with the longest days is June (Average daylight: 16h).
The month with the shortest days is December (Average daylight: 8.5h).

The month with the most sunshine is August (Average sunshine: 11.8h).
The month with the least sunshine is January (Average sunshine: 3.2h).

Average sunshine days - Heron, MT
Average visibility - Heron, MT