Climate and monthly weather forecast
Grangeville, ID

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The climate of Grangeville

Located in Idaho, USA, Grangeville has a Marine west coast, warm summer climate, as classified by the Köppen climate classification as Cfb. Geographically, it occupies a region with extensive climatic and weather fluctuations throughout the year. Certain weather patterns and statistics define the city's annual climatic regime, which is characterized by warm summers and predominantly cool winters, determining the lifestyle and activities of the inhabitants.

The yearly average high temperatures range from 33.6°F (0.9°C) in January to a peak of 82.6°F (28.1°C) in August, while the lows vary from a bottom of 21.7°F (-5.7°C) in December to 53.2°F (11.8°C), also in August. Throughout the year, differences in temperature can be considerable. The increase from the winter months to the summer months exemplifies these shifts, a typical attribute of this climate system.

Different weather elements such as sunshine hours, rainfall, snowfall, and wind contribute to Grangeville's overall climate. Analysis shows that the longest daylight duration, about 15.7 hours, can be expected in June, whereas December is the month with the shortest daylight time, just 8.7 hours. Between January and December, the rainfall levels oscillate from a low of 0.59" (15mm) in July to a high in April of 2.91" (74mm).

The highest snowfall of 12.8" (325mm) generally occurs in December, with no snowfall from May to September. The pace of the wind fluctuates throughout the year, with the speediest wind, 5.3mph (8.5km/h), occurring in January and November, and the slowest, 3.8mph (6.1km/h), in August.

The best time to visit Grangeville

For potential tourists, June to September is arguably the best time to visit Grangeville. The rationale behind this timing is the reliably warm and comfortable weather conditions. The period see temps soaring to between 62.6°F (17°C) and 82.6°F (28.1°C) and a low rainfall of between 0.59" (15mm) and 0.94" (24mm), which creates ideal conditions for outdoor activities and sightseeing.

Additionally, these months receive the most extended daylight time, ranging from 15 hours in June to 12.5 hours in September, providing ample time for daytime activities. The humidity level drops from 69% in June to a comfortable year-low of 47% in August, adding to the pleasant weather conditions during this period.

The worst time to visit Grangeville

January and February are arguably the least favored months for tourism in Grangeville, mainly due to the cold weather conditions. Temperature highs stay between 33.6°F (0.9°C) and 37.6°F (3.1°C), while lows drop to between 21.7°F (-5.7°C) and 25°F (-3.9°C). During these months, Grangeville experiences the heaviest snowfall, with an average of 12.4" (315mm) in January and 12.9" (328mm) in February.

Furthermore, these months experience the most reduced sunlight hours, with average monthly sunshine duration of 4.8 and 4.9 hours respectively. Consequently, the low temperatures, reduced daylight, and increased snowfall make it inconvenient for outdoor activities and sightseeing.

Spring weather in Grangeville

Spring in Grangeville extends from March to May and is marked by progressively rising temperatures and steady rainfall. The average high temperature elevates from 44.6°F (7°C) in March to 62.6°F (17°C) by May, while the average low temperature rises from 29.7°F (-1.3°C) in March to 38.8°F (3.8°C) in May.

Rainfall during these months ranges within 2.83" (72mm) and 2.32" (59mm), making it one of the wetter periods of the year. As temperatures rise through the period, snowfall decreases, moving from 9.96" (253mm) in March to almost nil in May.

Summer weather in Grangeville

Summer in Grangeville spans from June through August. The season is characterized by high temperatures ranging within 69.4°F (20.8°C) to 82.6°F (28.1°C). Average low temperatures also stay comfortably warm, ranging between 44.2°F (6.8°C) and 53.2°F (11.8°C).

Although it is the driest season with rainfall as low as 0.59" (15mm) in July, the humidity level reduces significantly to make the weather comfortable. This period also experiences zero snowfall, bringing the advantage of clear skies and bright sunshine.

Autumn weather in Grangeville

Fall in Grangeville, occurring from September to November, is a season of cooling temperatures. The average high temperature ranges from 72.7°F (22.6°C) in September to a chilly 43.3°F (6.3°C) by November. The average low temperature follows this downward trend, from 47.3°F (8.5°C) in September to 29.1°F (-1.6°C) in November.

Rainfall slightly increases compared to summer, from 0.94" (24mm) in September to 2.01" (51mm) in November, but remains relatively lower than in spring or winter. Snow re-emerges in November with an average of 5.67" (144mm) as winter approaches.

Winter weather in Grangeville

Winter in Grangeville stretches from December to February. It is characterized by cold temperatures and heavy snowfall. Temperature highs range from 33.6°F (0.9°C) to 37.6°F (3.1°C) and the lows vary between 21.7°F (-5.7°C) and 25°F (-3.9°C).

December witnesses the highest snowfall of the year, measuring around 12.8" (325mm), making travel during this month slightly difficult. Additionally, winter presents the year's lowest visibility parameters, primarily due to cloudy skies and snowfall. January and February continue the cold trend, with periods of snowfall and chilling temperatures prevailing.

Weather in January

Grangeville, Idaho experiences a cold start to the year with January. The frigid weather sees average high and low temperatures of 35.6°F (2°C) and 24.1°F (-4.4°C), respectively, with an impressive 12.48" (317mm) of snowfall over 15 days. Weather in January »

Weather in February

A seamless transition from January blankets Grangeville with cold winds, snowy conditions and cloudy skies. Noteworthy is the increase in snowfall which reaches 12.95" (329mm) in February. sunlight hours increase to around 10.4 hours a day, although the weather remains cold. Weather in February »

Weather in March

Moving into March, Grangeville begins to shed its white winter cloak as the city experiences higher temperatures. However, substantial snowfall of nearly 10" (254mm) still blankets the ground. There's an observable decrease in cloud cover and increase in daylight hours, promising the forthcoming arrival of spring. Weather in March »

Weather in April

April in Grangeville brings about a noticeable change in the climate as winter transitions to spring. As warmer air replaces the wintry chill, all the snowfalls give way to more rainfall, amounting to close to 3" (76mm) over 19 days. Weather in April »

Weather in May

Grangeville embraces May with warmer temperatures and lengthened daylight hours. The climate sees a significant decrease in cloud cover and rainfall, a mere 2.32" (59mm), signifying the peak of spring. With almost no snowfall, the city welcomes its residents outdoors to enjoy a plethora of springtime activities. Weather in May »

Weather in June

The weather in June in Grangeville shows the unmistakable signs of an approaching summer, with corresponding weather conditions. The remarkable feature in June is the absence of snowfall, paving the way for outdoor enthusiast to seize the day. Weather in June »

Weather in July

July's weather in Grangeville, Idaho is in stark contrast to the beginning of the year. The city experiences the highest temperatures of the year with the mercury soaring to nearly 82°F (27.8°C). As sunlight dominates the weather, the city sees only a negligible 0.59" (15mm) of precipitation over seven days. Weather in July »

Weather in August

As August starts in Grangeville, the scorching hot July gives way to somewhat cooler, yet still warm, weather conditions. Despite the slight dip in the temperature, the city witnesses a maximum temperature of 82.6°F (28.1°C). It's not surprising to see locals and tourists continuing to indulge in various water sports and picnics. Weather in August »

Weather in September

The onset of September in Grangeville brings with it the first hints of the approaching autumn. The temperature begins to fall significantly as compared to the preceding months, but the summer warmth lingers. A remarkable characteristic of September's weather is a slight increase in rainfall to almost 1 inch. Weather in September »

Weather in October

October in Grangeville, Idaho is synonymous with falling leaves, cooler temperatures and shorter days. The shift in weather stands evident, with further reduced daylight hours and a significant decrease in temperature compared to September. Weather in October »

Weather in November

In November, Grangeville experiences a further drop in temperature and increase in precipitation levels. As frosty winds start looming, the city braces itself for the winter with an average of 5.67" (144mm) of snowfall. The transition from fall to winter becomes apparent with the landscape transforming into a white wonderland. Weather in November »

Weather in December

Come December, Grangeville is completely submerged in winter, with the weather becoming harsh and frigid. The visible transition from November is the increase in snowfall, standing at nearly 13" (330mm), the highest of the year. Weather in December »
Updated: Jul 18, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the most humid month?

January is the most humid month, with an average relative humidity of 88%.

How much does it rain?

Throughout the year, there are 146.2 rainfall days, and 23.35" (593mm) of precipitation is accumulated.

When does it snow?

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

How much does it snow?

In Grangeville, during the entire year, snow falls for 80.3 days and aggregates up to 60.47" (1536mm) of snow.

What is the month with the least sunshine?

With an average of 4.8h of sunshine, January has the least sunshine of the year.

What is the snowiest month?

February is the month with the most snowfall. Snow falls for 15.3 days and accumulates 12.95" (329mm) of snow.

What is the month with the lowest UV index?

With an average maximum UV index of 1, February is the month with the lowest UV index in Grangeville.

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 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 rainiest month?

April is the month with the most rainfall in Grangeville. Rain falls for 19.3 days and accumulates 2.91" (74mm) of precipitation.

When it does not snow?

June through August are months without snowfall.

When are the longest days in Grangeville?

June has the longest days of the year in Grangeville, with an average of 15h and 42min of daylight.

What is the driest month?

July is the month with the least rainfall. Rain falls for 7.3 days and accumulates 0.59" (15mm) of precipitation.

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

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

What is the warmest month?

In Grangeville, August registers the highest temperatures, averaging 82.6°F (28.1°C) at the peak and 53.2°F (11.8°C) at the lowest.

What is the least humid month?

The least humid month is August, with an average relative humidity of 47%.

What month has the most sunshine?

August has the most sunshine of the year, with an average of 11.9h of sunshine.

What time of the year is the coldest?

December, noted for its average high-temperature of 33.6°F (0.9°C) and an average low-temperature of 21.7°F (-5.7°C), is considered the coldest month.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 8h and 42min of daylight.

Average temperature
Grangeville, ID

Average temperature - Grangeville, ID

The warmest month (with the highest average high temperature) is August (82.6°F).
The month with the lowest average high temperature is December (33.6°F).

The month with the highest average low temperature is August (53.2°F).
The coldest month (with the lowest average low temperature) is December (21.7°F).

Average pressure
Grangeville, ID

Average pressure - Grangeville, ID

The month with the highest atmospheric pressure is January (30.21"Hg).
The months with the lowest atmospheric pressure are June and August (29.94"Hg).

Average wind speed
Grangeville, ID

Average wind speed - Grangeville, ID

The windiest months (with the highest average wind speed) are January and November (4.9mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).

Average humidity
Grangeville, ID

Average humidity - Grangeville, ID

The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is August (47%).

Average rainfall
Grangeville, ID

Average rainfall - Grangeville, ID

The wettest month (with the highest rainfall) is April (2.91").
The driest month (with the least rainfall) is July (0.59").

Average rainfall days
Grangeville, ID

Average rainfall days - Grangeville, ID

The month with the highest number of rainy days is April (19.3 days).
The month with the least rainy days is August (6.8 days).

Average snowfall
Grangeville, ID

Average snowfall - Grangeville, ID

The month with the highest snowfall is February (12.95").
The months with the least snowfall are June, July and August (0").

Average snowfall days
Grangeville, ID

Average snowfall days - Grangeville, ID

The month with the highest number of snowfall days is December (16.9 days).
The months with the least snowfall days are June, July and August (0 days).

Average daylight / Average sunshine
Grangeville, ID

Average daylight / Average sunshine - Grangeville, ID

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).

The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).

Average sunshine days
Grangeville, ID

Average sunshine days - Grangeville, ID

The month with the most sunshine days is August (22.2 days).
The month with the least sunshine days is March (7.5 days).

Average visibility
Grangeville, ID

Average visibility - Grangeville, ID

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

Grangeville, Idaho, USA

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