Climate and monthly weather forecast
Hartline, WA

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Weather in January

January is a wintry winter month in Hartline, Washington, with temperature in the range of an average high of 32°F (0°C) and an average low of 21.9°F (-5.6°C). With the onset of January, the average high-temperature stands at an icy 32°F (0°C), closely aligned with December's 31.6°F (-0.2°C). Weather in January »

Weather in February

The last month of the winter, February, is also an icy month in Hartline, Washington, with an average temperature varying between 35.6°F (2°C) and 24.1°F (-4.4°C). February's advent denotes a minor fluctuation in the average high-temperature to a still icy 35.6°F (2°C) from January's 32°F (0°C). Weather in February »

Weather in March

March, the first month of the spring in Hartline, is a chilly month, with an average temperature varying between 46°F (7.8°C) and 32°F (0°C). Entering March, Hartline sees a temperature rise, with the average high-temperature advancing from February's icy 35.6°F (2°C) to a frosty 46°F (7.8°C). Weather in March »

Weather in April

April is a refreshing spring month in Hartline, Washington, with an average temperature ranging between min 37.9°F (3.3°C) and max 57°F (13.9°C). In April, the average high-temperature increases from a chilly 46°F (7.8°C) in March to a moderate 57°F (13.9°C). Weather in April »

Weather in May

The last month of the spring, May, is a refreshing month in Hartline, Washington, with temperature in the range of an average low of 46°F (7.8°C) and an average high of 67.6°F (19.8°C). Noticing a change, the average high-temperature during May moves from April's mild 57°F (13.9°C) to a comfortable 67.6°F (19.8°C). Weather in May »

Weather in June

The first month of the summer, June, is a moderately hot month in Hartline, Washington, with an average temperature varying between 51.8°F (11°C) and 74.3°F (23.5°C). June's arrival brings a modest temperature shift, moving from an enjoyable 67.6°F (19.8°C) in May to a moderately hot 74.3°F (23.5°C). Weather in June »

Weather in July

July, like June, in Hartline, Washington, is another warm summer month, with an average temperature varying between 59.7°F (15.4°C) and 84.9°F (29.4°C). Hartline witnesses the warmest weather in July, with temperatures averaging a high of 84.9°F (29.4°C) and a low of 59.7°F (15.4°C). Weather in July »

Weather in August

August, the last month of the summer in Hartline, is another warm month, with an average temperature ranging between min 61.3°F (16.3°C) and max 84.2°F (29°C). On the advent of August, Hartline's average high-temperature exhibits a minor adjustment to a still moderately hot 84.2°F (29°C) from July's 84.9°F (29.4°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a pleasant month in Hartline, Washington, with an average temperature ranging between min 53.2°F (11.8°C) and max 72.7°F (22.6°C). The beginning of September marks a decrease in the average high-temperature, transitioning from a warm 84.2°F (29°C) in August to a pleasant 72.7°F (22.6°C). Weather in September »

Weather in October

October, like September, is another refreshing autumn month in Hartline, Washington, with an average temperature fluctuating between 41.4°F (5.2°C) and 56.3°F (13.5°C). The shift into October brings a noticeable decrease in the average high-temperature, falling from a pleasant 72.7°F (22.6°C) in September to a moderate 56.3°F (13.5°C). Weather in October »

Weather in November

November, the last month of the autumn in Hartline, is another cold month, with an average temperature fluctuating between 41.4°F (5.2°C) and 30.7°F (-0.7°C). The shift from October to November is characterized by a clear decrease in the average high-temperature, reducing from a refreshing 56.3°F (13.5°C) to a cold 41.4°F (5.2°C). Weather in November »

Weather in December

The first month of the winter, December, is also a subzero cold month in Hartline, Washington, with temperature in the range of an average high of 31.6°F (-0.2°C) and an average low of 21.4°F (-5.9°C). December, marked by an average high-temperature of 31.6°F (-0.2°C) and a low-temperature of 21.4°F (-5.9°C), is the coldest month. Weather in December »
Updated: Feb 14, 2024 | Published by: Weather U.S. | Resources

Frequently asked questions

What is the most humid month in Hartline?

January is the most humid month in Hartline, with an average relative humidity of 89%.

How many days does it rain in Hartline?

Throughout the year, in Hartline, there are 102.1 rainfall days, and 9.65" (245mm) of precipitation is accumulated.

When does it snow in Hartline?

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

What is the snowiest month in Hartline?

January is the month with the most snowfall in Hartline, Washington. Snow falls for 8.4 days and accumulates 4.41" (112mm) of snow.

How much does it snow in Hartline?

In Hartline, Washington, during the entire year, snow falls for 33.4 days and aggregates up to 14.65" (372mm) of snow.

What is the month with the least sunshine in Hartline?

The month with the least sunshine in Hartline is January, with an average of 4.1h of sunshine.

When is Daylight Saving Time (DST) in Hartline?

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

What is the wettest month in Hartline?

The months with the most rainfall are May and December, with an average 1.18" (30mm) of precipitation.

When it does not snow in Hartline?

May through August are months without snowfall in Hartline.

When are the longest days in Hartline?

June has the longest days of the year in Hartline, with an average of 15h and 54min of daylight.

What month is the hottest in Hartline?

Hartline witnesses the warmest weather in July, with temperatures averaging a high of 84.9°F (29.4°C) and a low of 59.7°F (15.4°C).

What is the driest month in Hartline?

The months with the least rainfall are July and August Rain falls for 4.2 days and accumulates 0.2" (5mm) of rain.

What is the month with the highest UV index in Hartline?

July is the month with the highest UV index in Hartline, with an average maximum UV index of 7.

What is the least humid month in Hartline?

The least humid month in Hartline, Washington, is August, with an average relative humidity of 36%.

What month has the most sunshine in Hartline?

With an average of 12.1h of sunshine, August has the most sunshine of the year.

When is the lowest UV index in Hartline?

The month with the lowest UV index in Hartline is November, with an average maximum UV index of 1.

What are the coldest months in Hartline?

In Hartline, December is the coldest month, with temperatures averaging a high of 31.6°F (-0.2°C) and a low of 21.4°F (-5.9°C).

What is the month with the shortest days in Hartline?

December has the shortest days of the year, with an average of 8h and 30min of daylight.

Average temperature
Hartline, WA

Average temperature - Hartline, WA

The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is December (31.6°F).

The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is December (21.4°F).

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Average pressure
Hartline, WA

Average pressure - Hartline, WA

The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).

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Average wind speed
Hartline, WA

Average wind speed - Hartline, WA

The windiest month (with the highest average wind speed) is April (7mph).
The calmest month (with the lowest average wind speed) is January (4.9mph).

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Average rainfall
Hartline, WA

Average rainfall - Hartline, WA

The wettest months (with the highest rainfall) are May and December (1.18").
The driest months (with the least rainfall) are July and August (0.2").

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Average rainfall days
Hartline, WA

Average rainfall days - Hartline, WA

The month with the highest number of rainy days is March (12.1 days).
The month with the least rainy days is August (3.2 days).

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Average snowfall
Hartline, WA

Average snowfall - Hartline, WA

The month with the highest snowfall is January (4.41").
The months with the least snowfall are May, June, July and August (0").

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Average snowfall days
Hartline, WA

Average snowfall days - Hartline, WA

The month with the highest number of snowfall days is December (10.5 days).
The months with the least snowfall days are May, June, July and August (0 days).

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Average daylight / Average sunshine
Hartline, WA

Average daylight / Average sunshine - Hartline, WA

The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).

The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).

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Average sunshine days
Hartline, WA

Average sunshine days - Hartline, WA

The month with the most sunshine days is August (25.8 days).
The month with the least sunshine days is March (14.7 days).

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Average visibility
Hartline, WA

Average visibility - Hartline, WA

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

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Hartline, Washington, USA

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