Climate and monthly weather forecastAlton, ID
Climate and monthly weather forecast
Weather in January
January, the same as December, in Alton, Idaho, is another subzero cold winter month, with an average temperature fluctuating between 26.2°F (-3.2°C) and 7.9°F (-13.4°C). January brings a marginal elevation to a still subzero cold 26.2°F (-3.2°C) from December's 25.2°F (-3.8°C) in Alton's average high-temperatures. Weather in January »Weather in February
The last month of the winter, February, is also a subzero cold month in Alton, Idaho, with an average temperature fluctuating between 10.2°F (-12.1°C) and 27.3°F (-2.6°C). The arrival of February sees a recorded average high-temperature of a still subzero cold 27.3°F (-2.6°C), showing little divergence from the previous month's conditions. Weather in February »Weather in March
The first month of the spring, March, is a cold month in Alton, Idaho, with an average temperature ranging between min 18°F (-7.8°C) and max 34.5°F (1.4°C). With the start of March, the average high-temperature marginally shifts from February's freezing cold 27.3°F (-2.6°C) to a cold 34.5°F (1.4°C). Weather in March »Weather in April
April is a frosty spring month in Alton, Idaho, with temperature in the range of an average high of 44.2°F (6.8°C) and an average low of 25°F (-3.9°C). A rise in the average high-temperature is observed during April, moving from a cold 34.5°F (1.4°C) in March to a chilly 44.2°F (6.8°C). Weather in April »Weather in May
The last month of the spring, May, is a mild month in Alton, Idaho, with temperature in the range of an average low of 33.3°F (0.7°C) and an average high of 56.3°F (13.5°C). The arrival of May brings a change in Alton's weather, with average high-temperatures moving from April's chilly 44.2°F (6.8°C) to a moderate 56.3°F (13.5°C). Weather in May »Weather in June
The first month of the summer, June, is an agreeable month in Alton, Idaho, with an average temperature varying between 40.6°F (4.8°C) and 68.9°F (20.5°C). With the transition into June, Alton experiences an increase in average high-temperatures, moving up from a moderate 56.3°F (13.5°C) in May to an agreeable 68.9°F (20.5°C). Weather in June »Weather in July
July is a moderately hot summer month in Alton, Idaho, with an average temperature ranging between max 79°F (26.1°C) and min 48.9°F (9.4°C). Alton's warmest weather arrives in July, when temperatures average a high of 79°F (26.1°C) and a low of 48.9°F (9.4°C). Weather in July »Weather in August
August, the last month of the summer in Alton, is also a moderately hot month, with an average temperature fluctuating between 77.7°F (25.4°C) and 48.6°F (9.2°C). August's beginning signals an average high-temperature of a still moderately hot 77.7°F (25.4°C), barely different from July's 79°F (26.1°C). Weather in August »Weather in September
September, the first month of the autumn in Alton, is still a pleasant month, with temperature in the range of an average high of 68°F (20°C) and an average low of 42.3°F (5.7°C). The arrival of September corresponds with a shift in temperature, down from a moderately hot 77.7°F (25.4°C) in August to a pleasant 68°F (20°C). Weather in September »Weather in October
October, like September, in Alton, Idaho, is a cool autumn month, with an average temperature varying between 30.4°F (-0.9°C) and 50.5°F (10.3°C). The transition from September to October brings a clear temperature drop, with average high-temperatures decreasing from an agreeable 68°F (20°C) to a cool 50.5°F (10.3°C). Weather in October »Weather in November
The last month of the autumn, November, is another cold month in Alton, Idaho, with an average temperature fluctuating between 36.5°F (2.5°C) and 19.4°F (-7°C). The arrival of November signals a shift in temperature, down from a fresh 50.5°F (10.3°C) in October to a cold 36.5°F (2.5°C). Weather in November »Weather in December
The first month of the winter, December, is also a subzero cold month in Alton, Idaho, with an average temperature varying between 9.5°F (-12.5°C) and 25.2°F (-3.8°C). Alton's temperature records reveal December as the coldest month, marked by average highs of 25.2°F (-3.8°C) and lows of 9.5°F (-12.5°C). Weather in December »Updated: Aug 26, 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
The months with the highest humidity are January and February, with an average relative humidity of 92%.
In Alton, Idaho, during the entire year, the rain falls for 117.5 days and collects up to 20.24" (514mm) of precipitation.
Months with snowfall are January through June, September through December.
Throughout the year, there are 116.1 snowfall days, and 91.14" (2315mm) of snow is accumulated.
The month with the least sunshine is January, with an average of 4.4h of sunshine.
January, November and December, with an average maximum UV index of 1, are months with the lowest UV index.
The month with the most snowfall is February, when snow falls for 21.3 days and typically aggregates up to 18.39" (467mm) of snow.
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.
May is the month with the most rainfall. Rain falls for 17.3 days and accumulates 2.6" (66mm) of precipitation.
With an average of 15h and 12min of daylight, June has the longest days of the year.
The months with the highest UV index are June and July, with an average maximum UV index of 5.
Alton experiences its average highest temperatures in July, reaching a peak of 79°F (26.1°C) and a minimum of 48.9°F (9.4°C).
The month with the least rainfall is July, when the rain falls for 7.8 days and typically collects 0.63" (16mm) of precipitation.
In Alton, snow does not fall in July and August.
The month with the most sunshine is July, with an average of 11.9h of sunshine.
With an average relative humidity of 42%, August is the least humid month.
December, characterized by an average high temperature of 25.2°F (-3.8°C) and a low temperature of 9.5°F (-12.5°C), is generally the coldest month.
December has the shortest days of the year, with an average of 9h and 12min of daylight.
Average temperature
Alton, ID
The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is December (25.2°F).
The month with the highest average low temperature is July (48.9°F).
The coldest month (with the lowest average low temperature) is January (7.9°F).
Average pressure
Alton, ID
- Average pressure in January:
30.29"Hg - Average pressure in February:
30.16"Hg - Average pressure in March:
30.06"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.91"Hg - Average pressure in June:
29.9"Hg
- Average pressure in July:
29.95"Hg - Average pressure in August:
29.95"Hg - Average pressure in September:
29.97"Hg - Average pressure in October:
30.05"Hg - Average pressure in November:
30.15"Hg - Average pressure in December:
30.25"Hg
The month with the highest atmospheric pressure is January (30.29"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed
Alton, ID
- Average wind speed in January:
4.2mph - Average wind speed in February:
4.8mph - Average wind speed in March:
4.8mph - Average wind speed in April:
5.5mph - Average wind speed in May:
5.5mph - Average wind speed in June:
5.8mph
- Average wind speed in July:
5.3mph - Average wind speed in August:
5.6mph - Average wind speed in September:
5.4mph - Average wind speed in October:
4.8mph - Average wind speed in November:
4.7mph - Average wind speed in December:
4.2mph
The windiest month (with the highest average wind speed) is June (5.8mph).
The calmest months (with the lowest average wind speed) are January and December (4.2mph).
Average humidity
Alton, ID
The months with the highest relative humidity are January and February (92%).
The month with the lowest relative humidity is August (42%).
Average rainfall
Alton, ID
- Average rainfall in January:
2.17" - Average rainfall in February:
2.44" - Average rainfall in March:
2.13" - Average rainfall in April:
2.48" - Average rainfall in May:
2.6" - Average rainfall in June:
1.3"
- Average rainfall in July:
0.63" - Average rainfall in August:
0.79" - Average rainfall in September:
1.14" - Average rainfall in October:
1.22" - Average rainfall in November:
1.46" - Average rainfall in December:
1.89"
The wettest month (with the highest rainfall) is May (2.6").
The driest month (with the least rainfall) is July (0.63").
Average rainfall days
Alton, ID
- Average rainfall days in January:
6 days - Average rainfall days in February:
7.2 days - Average rainfall days in March:
11.5 days - Average rainfall days in April:
14.7 days - Average rainfall days in May:
17.3 days - Average rainfall days in June:
10.9 days
- Average rainfall days in July:
7.8 days - Average rainfall days in August:
8.5 days - Average rainfall days in September:
9.1 days - Average rainfall days in October:
9.1 days - Average rainfall days in November:
6.9 days - Average rainfall days in December:
8.5 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (6 days).
Average snowfall
Alton, ID
- Average snowfall in January:
18.11" - Average snowfall in February:
18.39" - Average snowfall in March:
14.29" - Average snowfall in April:
9.65" - Average snowfall in May:
2.56" - Average snowfall in June:
0.08"
The month with the highest snowfall is February (18.39").
The months with the least snowfall are July and August (0").
Average snowfall days
Alton, ID
- Average snowfall days in January:
19.8 days - Average snowfall days in February:
21.3 days - Average snowfall days in March:
18.3 days - Average snowfall days in April:
12.3 days - Average snowfall days in May:
3.4 days - Average snowfall days in June:
0.4 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0.5 days - Average snowfall days in October:
5.6 days - Average snowfall days in November:
12.9 days - Average snowfall days in December:
21.6 days
The month with the highest number of snowfall days is December (21.6 days).
The months with the least snowfall days are July and August (0 days).
Average daylight / Average sunshine
Alton, ID
- Average daylight in January:
9h and 30min - Average daylight in February:
10h and 36min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 36min - Average daylight in June:
15h and 12min
- Average daylight in July:
14h and 54min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 48min - Average daylight in December:
9h and 12min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January:
4h and 24min - Average sunshine in February:
4h and 30min - Average sunshine in March:
6h and 18min - Average sunshine in April:
9h and 6min - Average sunshine in May:
10h and 24min - Average sunshine in June:
11h and 24min
- Average sunshine in July:
11h and 54min - Average sunshine in August:
11h and 48min - Average sunshine in September:
10h and 6min - Average sunshine in October:
7h and 6min - Average sunshine in November:
6h and 6min - Average sunshine in December:
4h and 42min
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 24min).
Average sunshine days
Alton, ID
- Average sunshine days in January:
11.3 days - Average sunshine days in February:
6.8 days - Average sunshine days in March:
7.8 days - Average sunshine days in April:
7.6 days - Average sunshine days in May:
8.8 days - Average sunshine days in June:
16.2 days
- Average sunshine days in July:
18.8 days - Average sunshine days in August:
18.1 days - Average sunshine days in September:
18.3 days - Average sunshine days in October:
18 days - Average sunshine days in November:
14.9 days - Average sunshine days in December:
9.4 days
The month with the most sunshine days is July (18.8 days).
The month with the least sunshine days is February (6.8 days).
Average UV index
Alton, ID
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover
Alton, ID
The month with the most cloud cover is February (Cloud cover 62).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility
Alton, ID
The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January and February (3mi).
