Home

Idaho Weather / Climate

Idaho Weather / Climate

Average Temperature Throughout Idaho

Idaho Weather / Climate

Average Temperature Throughout Idaho

  • As one would observe, the state of Idaho is at a considerably high elevation. Naturally then, the highest average temperatures are observed in the parts of the state at a lower elevation like the Clearwater and Little Salmon river basins or the area between the Snake River valley and Lewiston. Other areas that experience warm temperate climate are the valleys of Boise, Payette and Weiser rivers.

  • The highest temperatures recorded are at a place called Swan Falls and the annual mean temperature here is about 55 degrees F.

  • The place that records the lowest temperatures in the state is Obsidian, which is located at the height of 6,780 feet. This place reports the annual lowest average temperature which is 35.4 degrees F. Other examples of places experiencing cold temperature are Sun Valley, Stanley and Island Park.

  • In certain areas like the rugged forests or other areas of the valley, the temperature goes lower than the recorded temperature at Obsidian.  The monthly mean temperatures recorded in areas around the Snake River basin and its tributaries as also between the Twin Falls and Idaho Falls range from 32 degrees F to lower than that, in the months from December to January.

  • In the lower elevated sections however the monthly mean temperature are freezing or below freezing, specifically in the winters (from December to January). Extremely low level areas like Riggins and Lewiston, for example, have never recorded a monthly mean temperature of 32 degrees or lower.

  • Idaho’s climate and its eccentricity can be seen through the simple fact that the coldest monthly mean temperature to be ever recorded is a chilling -20 degrees F. On the other hand the warmest monthly mean temperature to be recorded is 104 degrees F.

Precipitation and its Effect on Idaho’s Climate

  • Precipitation has a massive impact on the climate of any area. It decides the amount of rainfall or snowfall an area is going to receive. In the case of Idaho’s climate, the Pacific Ocean is perhaps the greatest source of precipitation.

  •  A lot of storm activity coupled with thundering can be witnessed in the eastern parts of Idaho when moisture laden air is brought in from the south at high levels.

  •  Statistically, it is worth noting that areas in Clearwater, Payette and Boise River basins receive an average up to 40 to 50 inches of rainfall per year. Other areas like the Central Plains and Southwestern Valleys located at lower elevations receive only 10 inches or less per year.

  • Both moisture and height of elevation come in to play when it comes to snowfall distribution. Past records have documented proof of northern parts of Idaho receiving up to 500 inches of snowfall.

  •  Another interesting coincidence is that the greatest long term, seasonal average (13 years) and the greatest snow depth, were both 182 inches and at the same place - Mullan Pass. Idaho’s climate can be a bit chilly sometimes. In fact most of the tallest mountain ranges are covered with snow in the winter months.

Effect of Idaho’s Climate on Distribution of Sunshine

  • The average percentage of sunshine experienced throughout the state of Idaho ranges from 50% in the north to 70% in the southern parts.

  • The possibility of sunshine in the winter months is usually low due to the clouds and fog. Thus the average percentage of sunshine in the months of winter in the northern parts is as low 30% whereas in the southern parts the condition is a bit better with 40% of sunshine.

  • July and August, however, are the months in which the percentage of sunshine goes up to 80% in most of the parts of the state.

All in all, after considering several climatic factors, one can safely say that Idaho may not be a state of Sun and Sand. However, it does have breath taking views and other tourist attractions to capture souls.

Monthly Normal High and Low Temperatures

City Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Boise 37/24 44/29 54/34 62/39 71/47 80/54 89/60 88/60 77/51 64/41 48/32 37/24
Lewiston 39/28 46/31 54/36 62/41 70/47 78/54 88/59 88/59 77/51 62/41 47/34 39/28
Pocatello 32/16 39/21 48/27 58/33 68/39 78/46 88/51 87/50 76/42 62/33 44/25 34/17

Idaho Weather Maps


Idaho Climate Graph

Idaho Weather Map

Idaho Hardliness Zones

Idaho Climate Map

 

  • As one would observe, the state of Idaho is at a considerably high elevation. Naturally then, the highest average temperatures are observed in the parts of the state at a lower elevation like the Clearwater and Little Salmon river basins or the area between the Snake River valley and Lewiston. Other areas that experience warm temperate climate are the valleys of Boise, Payette and Weiser rivers.

  • The highest temperatures recorded are at a place called Swan Falls and the annual mean temperature here is about 55 degrees F.

  • The place that records the lowest temperatures in the state is Obsidian, which is located at the height of 6,780 feet. This place reports the annual lowest average temperature which is 35.4 degrees F. Other examples of places experiencing cold temperature are Sun Valley, Stanley and Island Park.

  • In certain areas like the rugged forests or other areas of the valley, the temperature goes lower than the recorded temperature at Obsidian.  The monthly mean temperatures recorded in areas around the Snake River basin and its tributaries as also between the Twin Falls and Idaho Falls range from 32 degrees F to lower than that, in the months from December to January.

  • In the lower elevated sections however the monthly mean temperature are freezing or below freezing, specifically in the winters (from December to January). Extremely low level areas like Riggins and Lewiston, for example, have never recorded a monthly mean temperature of 32 degrees or lower.

  • Idaho’s climate and its eccentricity can be seen through the simple fact that the coldest monthly mean temperature to be ever recorded is a chilling -20 degrees F. On the other hand the warmest monthly mean temperature to be recorded is 104 degrees F.

Precipitation and its Effect on Idaho’s Climate

  • Precipitation has a massive impact on the climate of any area. It decides the amount of rainfall or snowfall an area is going to receive. In the case of Idaho’s climate, the Pacific Ocean is perhaps the greatest source of precipitation.

  •  A lot of storm activity coupled with thundering can be witnessed in the eastern parts of Idaho when moisture laden air is brought in from the south at high levels.

  •  Statistically, it is worth noting that areas in Clearwater, Payette and Boise River basins receive an average up to 40 to 50 inches of rainfall per year. Other areas like the Central Plains and Southwestern Valleys located at lower elevations receive only 10 inches or less per year.

  • Both moisture and height of elevation come in to play when it comes to snowfall distribution. Past records have documented proof of northern parts of Idaho receiving up to 500 inches of snowfall.

  •  Another interesting coincidence is that the greatest long term, seasonal average (13 years) and the greatest snow depth, were both 182 inches and at the same place - Mullan Pass. Idaho’s climate can be a bit chilly sometimes. In fact most of the tallest mountain ranges are covered with snow in the winter months.

Effect of Idaho’s Climate on Distribution of Sunshine

  • The average percentage of sunshine experienced throughout the state of Idaho ranges from 50% in the north to 70% in the southern parts.

  • The possibility of sunshine in the winter months is usually low due to the clouds and fog. Thus the average percentage of sunshine in the months of winter in the northern parts is as low 30% whereas in the southern parts the condition is a bit better with 40% of sunshine.

  • July and August, however, are the months in which the percentage of sunshine goes up to 80% in most of the parts of the state.

All in all, after considering several climatic factors, one can safely say that Idaho may not be a state of Sun and Sand. However, it does have breath taking views and other tourist attractions to capture souls.

Monthly Normal High and Low Temperatures

City Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Boise 37/24 44/29 54/34 62/39 71/47 80/54 89/60 88/60 77/51 64/41 48/32 37/24
Lewiston 39/28 46/31 54/36 62/41 70/47 78/54 88/59 88/59 77/51 62/41 47/34 39/28
Pocatello 32/16 39/21 48/27 58/33 68/39 78/46 88/51 87/50 76/42 62/33 44/25 34/17

   More in Travel