Climate and monthly weather forecast
Shelley, ID

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The climate of Shelley

Shelley, Idaho, USA, situated in a mid-latitude steppe, is categorized under the Köppen climate classification as BSk. This classification identifies a semi-arid climate with a clear distinction between the seasons. A comprehensive overview of the climatological data indicates a wide variation in climate conditions throughout the year.

The temperature in Shelley shifts between a high of 85.3°F (29.6°C) in July and a low of 14.7°F (-9.6°C) in January. The weather is typically hot in summer and quite cold in winter. There are fluctuations in rainfall with January and November receiving 1.06" (27mm) while lowest precipitation is reported in July with a measure of 0.51" (13mm). The average number of rainy days range from 6.1 in January to 15.9 in May.

Snowfall is concentrated in the winter months with the highest at 7.44" (189mm) in January and virtually non-existent from June to September. The annual average humidity relative scales from a high of 90% in January, descending to a low of 36% in July and August. Levels of sunlight vary from 4.8 hours per day in January to an apex of 11.9 hours in July.

The best time to visit Shelley

The most favorable time to visit Shelley is during the summer months, specifically from June to August, when the weather is warm and conducive for outdoor explorations. With temperatures extending from 73.8°F (23.2°C) to 85.3°F (29.6°C) and daily sunlight hours peaking at 15.4 hours, visitors have ample opportunity to enjoy local attractions. Relative humidity averages at a comfortable 48% and rainfall is at its lowest, making it the best season for outdoor activities.

The worst time to visit Shelley

The least suitable time to visit Shelley would be the winter period, specifically from December to February. Throughout this season, temperatures can be unbearably low, dropping to as low as 14.7°F (-9.6°C) in January. Moreover, the probability of snowfall is quite high, reaching 7.44" (189mm) in January. Therefore, the cold winter months present unfavorable conditions for tourists keen on outdoor activities.

Spring weather in Shelley

Spring in Shelley, extending from March to May, witnesses a gradual rise in temperatures ranging from 42.1°F (5.6°C) to 63°F (17.2°C). Rainfall is at a modest level with figures of 1.3" (33mm) in March to 1.57" (40mm) in May. The average number of daylight hours trends upwards, reaching a maximum of 14.7 hours by the end of the period.

Summer weather in Shelley

Summer, from June to August, is the warmest period in Shelley. Temperatures inch up to 73.8°F (23.2°C) in June and peak at 85.3°F (29.6°C) in July. Rainfall dwindles to 0.51" (13mm) in July before making a slight rebound to 0.83" (21mm) in August. Sunlight is abundant, treating Shelley to an average of over 15 hours of daylight each day.

Autumn weather in Shelley

The transition from summer to winter, namely the autumn months of September to November, in Shelley comes with a gradual decrease in temperatures, daylight hours, and an increase in the amount of precipitation. Temperatures can range from 72.9°F (22.7°C) in September to 41°F (5°C) by November. Rainfall ranges from 1.06" (27mm) in September to 0.75" (19mm) in November.

Winter weather in Shelley

During the winter period which lasts from December to February, Shelley is predominantly cold. Temperatures plummet to lows between 27.9°F (-2.3°C) and 14.7°F (-9.6°C) and snowfall is at its highest, with a peak of 7.44" (189mm) in December. The sunlight hours reduce to just above 9 per day, making this the shortest day period of the year. The humidity rises back up to 86% by February, while wind speeds hover between 6.2mph (10km/h) and 8.9mph (14.3km/h), potentially making conditions feel even colder.

Weather in January

In Shelley, Idaho, January is a winter month with dominant wintry weather features. The temperatures are cold and snowfall is frequent, with an impressive 7.44" (189mm) of snow falling throughout the month. While the daytime temperatures gently creep up from December, night temperatures drop, often feeling frosty. Weather in January »

Weather in February

As Shelley, Idaho moves into February, winter remains well entrenched, but there are subtle indications of the upcoming spring. Temperatures rise marginally and the volume of snowfall reduces to 5.28" (134mm), even though the number of snowfall days is still pretty high. Weather in February »

Weather in March

In March, the weather in Shelley, Idaho is caught between winter's chill and spring's mild warmth. The most noticeable change is in the rise in temperatures, with the high reaching 42.1°F (5.6°C). Despite the cooler nights, the air tends to become less dense as the relative humidity falls to 76%. Weather in March »

Weather in April

April in Shelley, Idaho brings a definitive break from winter, with more spring-like weather patterns. A steady rise in both day and night temperatures underlines the transition into the warmer part of the year. The disappearance of snowfall signals the end of winter, giving way to increased rainfall - a consistent feature of spring. Weather in April »

Weather in May

May’s weather in Shelley, Idaho is typified by signs of early summer. The temperatures continue to rise, and rainfall becomes more prevalent. The warmth is further emphasized by the increased daylight hours reaching 14.7 hours. Delightfully, the heavy winter clouds start to disperse, and the city is frequently bathed in sunlight almost throughout the day. Weather in May »

Weather in June

The arrival of June brings summer's delight to Shelley, Idaho as the weather experiences a warm transformation. Temperatures now reach a sweltering high of 73.8°F (23.2°C). The blend of low humidity, increased daylight and sunshine hours serve as perfect conditions for outdoor activities. Weather in June »

Weather in July

July is peak summer in Shelley, Idaho, characterized by sizzling temperatures and long, sunny days. Interestingly, the city experiences its highest temperature of the year, topping at 85.3°F (29.6°C). A significant dip in humidity is noticed during this month, making the heat more bearable. Weather in July »

Weather in August

In August, Shelley, Idaho continues to relish the summer heat, though the temperature subtly drops, hinting at the coming autumn. While the rainfall marginally increases from July, the total sunlight hours start to decrease. Daylight hours also begin to drop, yet the city still enjoys a fair amount of sunshine. Weather in August »

Weather in September

Shelley, Idaho in September is a blend of lingering summer heat and incoming autumn coolness. September witnesses a more significant drop in temperature, but the city experiences a rise in rainfall after the drier summer months. Weather in September »

Weather in October

As October stride in, slushy autumn manifests itself in Shelley, Idaho. The weather turns markedly cooler, with temperatures dropping down noticeably from September's highs. An increase in rainfall adds to the atmosphere of a typical cool, wet autumn. Weather in October »

Weather in November

November in Shelley, Idaho marks the start of winter season, as the weather makes a cold turn. There is a significant drop in temperatures as the month registers a chilling low of 26.2°F (-3.2°C). The rainfall further increases making the days damp and a bit gloomy. Weather in November »

Weather in December

December brings the full force of winter to Shelley, Idaho. The fall in temperatures continues, with the mercury often plummeting to chilling lows. Snowfall makes a grand reappearance after a long hiatus, with 6.5" (165mm) settling throughout the city in December. Weather in December »
Updated: Jul 19, 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 90%.

How much does it rain?

In Shelley, during the entire year, the rain falls for 124.6 days and collects up to 12.24" (311mm) of precipitation.

When does it snow in Shelley?

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

What is the snowiest month?

The month with the most snowfall is January, when snow falls for 16.3 days and typically aggregates up to 7.44" (189mm) of snow.

How many days does it snow in Shelley?

Throughout the year, there are 75.1 snowfall days, and 30.59" (777mm) of snow is accumulated.

What is the month with the least sunshine?

The month with the least sunshine is January, with an average of 4.8h of sunshine.

What is the month with the lowest UV index?

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

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 rainiest month?

The month with the most rainfall is May, when the rain falls for 15.9 days and typically aggregates up to 1.57" (40mm) of precipitation.

When it does not snow?

June through August are months without snowfall.

When are the longest days?

June has the longest days of the year, with an average of 15h and 24min of daylight.

What part of the year is the hottest?

July stands out as Shelley's warmest month, with temperatures ranging between an average high of 85.3°F (29.6°C) and a low of 54.9°F (12.7°C).

What are the least humid months?

The months with the lowest humidity in Shelley, Idaho, are July and August, with an average relative humidity of 36%.

What is the driest month?

The month with the least rainfall is July, when the rain falls for 8.3 days and typically collects 0.51" (13mm) of precipitation.

What month has the most sunshine?

With an average of 11.9h 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 are the coldest months?

December, with an average high of 27.9°F (-2.3°C) and a low of 16°F (-8.9°C), signifies the coldest month of the year.

What is the month with the shortest days in Shelley?

December has the shortest days of the year in Shelley, with an average of 9h and 0min of daylight.

Average temperature
Shelley, ID

Average temperature - Shelley, ID

The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is December (27.9°F).

The month with the highest average low temperature is August (55°F).
The coldest month (with the lowest average low temperature) is January (14.7°F).

Average pressure
Shelley, ID

Average pressure - Shelley, ID

The month with the highest atmospheric pressure is January (30.3"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed
Shelley, ID

Average wind speed - Shelley, ID

The windiest month (with the highest average wind speed) is April (8.9mph).
The calmest month (with the lowest average wind speed) is January (6mph).

Average humidity
Shelley, ID

Average humidity - Shelley, ID

The month with the highest relative humidity is January (90%).
The months with the lowest relative humidity are July and August (36%).

Average rainfall
Shelley, ID

Average rainfall - Shelley, ID

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

Average rainfall days
Shelley, ID

Average rainfall days - Shelley, ID

The month with the highest number of rainy days is May (15.9 days).
The month with the least rainy days is January (6.1 days).

Average snowfall
Shelley, ID

Average snowfall - Shelley, ID

The month with the highest snowfall is January (7.44").
The months with the least snowfall are June, July and August (0").

Average snowfall days
Shelley, ID

Average snowfall days - Shelley, ID

The month with the highest number of snowfall days is December (16.7 days).
The months with the least snowfall days are June, July and August (0 days).

Average daylight / Average sunshine
Shelley, ID

Average daylight / Average sunshine - Shelley, ID

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

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

Average sunshine days
Shelley, ID

Average sunshine days - Shelley, ID

The month with the most sunshine days is October (18.9 days).
The month with the least sunshine days is March (10 days).

Average visibility
Shelley, ID

Average visibility - Shelley, ID

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 February (4mi).

Shelley, Idaho, USA

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