Our Trips. Travel Map. About Matador Careers Advertise. Skiing is nothing without the lingo. Photo: Ray J. This post is proudly produced in partnership with Visit Idaho. What did you think of this story? Download the mobile app. You've been signed up! Follow us on social media Facebook. No, thanks That's okay. The US average is 28 inches of snow per year. On average, there are sunny days per year in Idaho. The US average is sunny days. Snowfall Precipitation July High Low Annual Rainfall US Avg: Annual Snowfall US Avg: 25".
Precipitation Days US Avg: Deviations to this diurnal trend in wind direction are evident when a strong surface high pressure system is positioned west of the valley. In this case, winds will be northwest until the high pressure system moves east of the city then winds shift southeast. Similarly, deep low pressure systems to the west of Boise or highs to the east have the opposite effect to overcome the diurnal influences.
The mountain ranges both to the north and southwest of the valley act to channel winds through the valley in both the northwest and southeast directions. Wind direction other than northwest or southeast is uncommon but they do occur.
North to northeast winds from the Boise Mountains occur briefly on hot summer evenings pushing temperatures even higher due to downslope warming. Southwest winds blow occasionally when a large mid-latitude cyclone affects the Pacific Northwest in Winter. Overall wind direction climatology for the Treasure Valley indicates that 85 percent of all wind comes from either the northwest or southeast direction and evenly split between the two directions.
Locations at both ends of the Valley, at Mountain Home and Ontario, are windier due to channeling effects or in the case of northwest flow at Ontario , downsloping from the Blue Mountains in Eastern Oregon which causes Northwest winds to accelerate.
Boise is located about midway through the valley and closer to the Boise front range, so these channeling effects are not as pronounced as they are at the endpoints of the valley, thus lighter winds occur at Boise.
That is not to say that Boise does not have strong winds at times. They do occur and under varying circumstances. Strong winds at Boise occur in the following situations:. This means that nights cool down quickly and the days heat quickly as well. This is due to the overall dryness to the air and the higher elevation. Mountain barriers block very cold air masses from the east and north and also dry out Pacific air masses from the west. Because Boise lies within the main belt of the westerlies, Maritime Polar air masses dominate the region much of year, but they are considerably modified by the time they reach the local area.
This makes Boise temperatures milder in winter for this northern location but also hotter in Summer. Average annual temperature is 5 degrees warmer than cities at the same latitude east of the Rockies. The area has a cool season maximum of precipitation while the warm season is mostly dry. The bulk of the annual precipitation is received between November and May with three quarters of the amount.
The winter months are characterized by steady widespread precipitation while the warm season months have more spotty convective showers and thunderstorms. Boise and the Treasure Valley have a high frequency of night time precipitation in the winter months with 75 percent of the total falling between midnight and 8am local time. This overnight precipitation happens with uncanny regularity and often results in adverse traveling conditions in the early morning hours with roads covered in ice, snow, rain or a combination of all three.
Snowfall at Boise averages around 20 inches per year but can vary from a low of only a few inches to 30 to 40 inches. With milder temperatures frequently in the Treasure Valley during the winter, snowfall is not as great as in other mid-latitude locations. In contrast, the surrounding mountains get abundant snowfall in a normal year because of the higher elevation, colder temperatures and the mountain orographic wind flow effects producing these greater amounts of snow.
July mornings in Idaho are perfect for hiking the alpine zone or traversing through miles of nature trails in Sun Valley. August is warm to hot in the summer of Idaho , with mostly clear skies.
Little precipitation occurs in the north and east, but windstorms and forest fires are a threat to the tree-covered mountain slopes. White water rafting is enjoyable in the morning sun on the Boise River. Mountain biking is popular with the vast number of trails and loops.
Falcons, hawks, eagles, and other birds in the wild keep the interests of the bird watchers and hobbyists alive. Catch the time after sunrise for the best pictures. Light summer clothing keeps perspiration at bay during the day, but layered clothing is better to counter the drop in temperatures during the night.
Expect temperatures to cool off gradually by the end of summer in August in Idaho. Thunderstorms occasionally extend to the early fall season, but the rainfall is moderate at best. The daily sunshine lasts for 8 hours, which makes summer clothing relevant in early fall days.
Fall is the time to explore colors and enjoy the beauty of nature. The conditions cool down significantly by mid-September, which makes it an ideal time to soak in one of the many hot springs. Scenic byways and rural roads offer unmatched natural beauty but wear a jacket or sweater during the breezy evenings. A September visit to Idaho offers one of the best weather conditions of the year.
October is warm to cold in the fall season of Idaho and full of brilliant colors. Fall colors are at their peak by mid-October, and the refreshing air, scenic wilderness, and abundant wildlife make the conditions lively. Hues of yellow, orange, red, and purple color the beautiful landscape. The hunting and fishing and seasons are in full swing, with plenty of deer, elk, mountain sheep as well as trout, bass, and salmon for company.
The harvest season brings ample sugar beets, potatoes, onions, apples, pumpkins in the numerous farmers' markets of the countryside. Rain is negligible, but jackets and long pants offer comfort in the autumn than shorts and t-shirts of summer. Pack in layers if the objective is to explore the colors in the mountains in October in Idaho. The precipitation picks up to register 3" November sees the first signs of snow in the high mountains.
Sunny days are rare by the end of November as the trees begin to show bare limbs. The conditions are unpredictable, with shades of sunny, cold, or icy weather in different regions. The Sawtooth Scenic Byway along state highway 75 has some of the wildest forests in the country, with abundant wildlife sightings during the fall season.
Lake Coeur d'Alene has many miles of forested shoreline, sandy beaches, coves, and bays that make it an ideal fall getaway. November is the last month in Idaho with comfortable day temperatures. The north and central parts are snowier than the rest of the regions and receive between 5" mm to 15" mm. The winter brings cold air masses from the polar region that reaches the far south.
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