Climate and monthly weather forecastShelley, ID
Climate and monthly weather forecast
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
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January is the most humid month, with an average relative humidity of 90%.
In Shelley, during the entire year, the rain falls for 124.6 days and collects up to 12.24" (311mm) of precipitation.
January through May, September through December are months with snowfall.
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.
Throughout the year, there are 75.1 snowfall days, and 30.59" (777mm) of snow is accumulated.
The month with the least sunshine is January, with an average of 4.8h of sunshine.
January and December, with an average maximum UV index of 1, are months with the lowest UV index.
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.
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.
June through August are months without snowfall.
June has the longest days of the year, with an average of 15h and 24min of daylight.
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).
The months with the lowest humidity in Shelley, Idaho, are July and August, with an average relative humidity of 36%.
The month with the least rainfall is July, when the rain falls for 8.3 days and typically collects 0.51" (13mm) of precipitation.
With an average of 11.9h of sunshine, July has the most sunshine of the year.
July is the month with the highest UV index, with an average maximum UV index of 6.
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.
December has the shortest days of the year in Shelley, with an average of 9h and 0min of daylight.
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 in January:
30.3"Hg - Average pressure in February:
30.16"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
29.96"Hg - Average pressure in May:
29.92"Hg - Average pressure in June:
29.91"Hg
- Average pressure in July:
29.95"Hg - Average pressure in August:
29.95"Hg - Average pressure in September:
29.98"Hg - Average pressure in October:
30.06"Hg - Average pressure in November:
30.17"Hg - Average pressure in December:
30.26"Hg
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 in January:
6mph - Average wind speed in February:
7.2mph - Average wind speed in March:
7.8mph - Average wind speed in April:
8.9mph - Average wind speed in May:
8mph - Average wind speed in June:
8.6mph
- Average wind speed in July:
7.5mph - Average wind speed in August:
7.1mph - Average wind speed in September:
7.5mph - Average wind speed in October:
7.5mph - Average wind speed in November:
7.1mph - Average wind speed in December:
6.2mph
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
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 in January:
1.06" - Average rainfall in February:
0.91" - Average rainfall in March:
1.3" - Average rainfall in April:
1.34" - Average rainfall in May:
1.57" - Average rainfall in June:
1.1"
- Average rainfall in July:
0.51" - Average rainfall in August:
0.83" - Average rainfall in September:
1.06" - Average rainfall in October:
0.91" - Average rainfall in November:
0.75" - Average rainfall in December:
0.91"
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 in January:
6.1 days - Average rainfall days in February:
8.4 days - Average rainfall days in March:
14 days - Average rainfall days in April:
15.3 days - Average rainfall days in May:
15.9 days - Average rainfall days in June:
10.7 days
- Average rainfall days in July:
8.3 days - Average rainfall days in August:
9.3 days - Average rainfall days in September:
10.1 days - Average rainfall days in October:
10 days - Average rainfall days in November:
8.5 days - Average rainfall days in December:
8 days
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 in January:
7.44" - Average snowfall in February:
5.28" - Average snowfall in March:
4.76" - Average snowfall in April:
1.57" - Average snowfall in May:
0.59" - Average snowfall in June:
0"
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 in January:
16.3 days - Average snowfall days in February:
15.5 days - Average snowfall days in March:
10.6 days - Average snowfall days in April:
5 days - Average snowfall days in May:
0.6 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0.1 days - Average snowfall days in October:
1.5 days - Average snowfall days in November:
8.8 days - Average snowfall days in December:
16.7 days
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 in January:
9h and 24min - Average daylight in February:
10h and 30min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 30min - Average daylight in May:
14h and 42min - Average daylight in June:
15h and 24min
- Average daylight in July:
15h and 0min - Average daylight in August:
13h and 54min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 42min - Average daylight in December:
9h and 0min
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).
- Average sunshine in January:
4h and 48min - Average sunshine in February:
5h and 36min - Average sunshine in March:
7h and 30min - Average sunshine in April:
9h and 54min - Average sunshine in May:
10h and 48min - Average sunshine in June:
11h and 42min
- Average sunshine in July:
11h and 54min - Average sunshine in August:
11h and 48min - Average sunshine in September:
9h and 54min - Average sunshine in October:
7h and 24min - Average sunshine in November:
6h and 18min - Average sunshine in December:
5h and 6min
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 in January:
14.6 days - Average sunshine days in February:
10.3 days - Average sunshine days in March:
10 days - Average sunshine days in April:
10.2 days - Average sunshine days in May:
11 days - Average sunshine days in June:
15.4 days
- Average sunshine days in July:
17.8 days - Average sunshine days in August:
16.9 days - Average sunshine days in September:
17.3 days - Average sunshine days in October:
18.9 days - Average sunshine days in November:
17.5 days - Average sunshine days in December:
13 days
The month with the most sunshine days is October (18.9 days).
The month with the least sunshine days is March (10 days).
Average UV index
Shelley, ID
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Shelley, ID
The month with the most cloud cover is February (Cloud cover 51).
The months with the least cloud cover are July and August (Cloud cover 11).
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).
