Cold steppe climate
Climate Arco - Idaho
Annual high57ºF
Annual low30ºF
Precipitation10.42 inch
| Month | HighºF | LowºF | Precipinch |
|---|---|---|---|
| Jan | 30 | 7 | 1.00 |
| Feb | 34 | 11 | 0.75 |
| Mar | 46 | 24 | 0.86 |
| Apr | 58 | 32 | 1.00 |
| May | 67 | 40 | 1.27 |
| Jun | 76 | 46 | 1.28 |
| Jul | 86 | 52 | 0.71 |
| Aug | 85 | 50 | 0.62 |
| Sep | 74 | 41 | 0.64 |
| Oct | 60 | 32 | 0.63 |
| Nov | 42 | 20 | 0.71 |
| Dec | 30 | 9 | 0.95 |
- JanHigh 30ºFLow 7ºFPrecip 1.00 inch
- FebHigh 34ºFLow 11ºFPrecip 0.75 inch
- MarHigh 46ºFLow 24ºFPrecip 0.86 inch
- AprHigh 58ºFLow 32ºFPrecip 1.00 inch
- MayHigh 67ºFLow 40ºFPrecip 1.27 inch
- JunHigh 76ºFLow 46ºFPrecip 1.28 inch
- JulHigh 86ºFLow 52ºFPrecip 0.71 inch
- AugHigh 85ºFLow 50ºFPrecip 0.62 inch
- SepHigh 74ºFLow 41ºFPrecip 0.64 inch
- OctHigh 60ºFLow 32ºFPrecip 0.63 inch
- NovHigh 42ºFLow 20ºFPrecip 0.71 inch
- DecHigh 30ºFLow 9ºFPrecip 0.95 inch
Climate summary
What is the average weather in Arco, Idaho?
Arco experiences a cold semi-arid climate, marked by very large seasonal temperature contrasts due to its inland location. Summers are warm, but winters are very cold. The area is dry overall, with precipitation generally low and arriving in brief showers. Spring is the wettest season, while fall is the driest.
Arco weather averages
Annual high57ºF
Annual low30ºF
Precipitation10.42 inch
Daily normals Arco - Idaho - January
| Day | HighºF | LowºF | Prec/ | Prec/ | Snow/ | Snow/ |
|---|---|---|---|---|---|---|
| Jan 1 | 29.4 | 6.7 | 0.03 | 0.03 | 0.20 | 0.20 |
| Jan 2 | 29.4 | 6.7 | 0.06 | 0.06 | 0.30 | 0.30 |
| Jan 3 | 29.4 | 6.7 | 0.09 | 0.09 | 0.50 | 0.50 |
| Jan 4 | 29.4 | 6.6 | 0.12 | 0.12 | 0.60 | 0.60 |
| Jan 5 | 29.5 | 6.6 | 0.15 | 0.15 | 0.80 | 0.80 |
| Jan 6 | 29.5 | 6.6 | 0.17 | 0.17 | 1.00 | 1.00 |
| Jan 7 | 29.6 | 6.6 | 0.20 | 0.20 | 1.20 | 1.20 |
| Jan 8 | 29.6 | 6.6 | 0.23 | 0.23 | 1.40 | 1.40 |
| Jan 9 | 29.7 | 6.6 | 0.25 | 0.25 | 1.70 | 1.70 |
| Jan 10 | 29.8 | 6.6 | 0.27 | 0.27 | 1.90 | 1.90 |
| Jan 11 | 29.8 | 6.6 | 0.30 | 0.30 | 2.10 | 2.10 |
| Jan 12 | 29.9 | 6.6 | 0.32 | 0.32 | 2.40 | 2.40 |
| Jan 13 | 30.0 | 6.7 | 0.34 | 0.34 | 2.60 | 2.60 |
| Jan 14 | 30.1 | 6.7 | 0.36 | 0.36 | 2.90 | 2.90 |
| Jan 15 | 30.1 | 6.7 | 0.38 | 0.38 | 3.10 | 3.10 |
| Jan 16 | 30.2 | 6.8 | 0.40 | 0.40 | 3.40 | 3.40 |
| Jan 17 | 30.3 | 6.8 | 0.42 | 0.42 | 3.60 | 3.60 |
| Jan 18 | 30.4 | 6.9 | 0.44 | 0.44 | 3.80 | 3.80 |
| Jan 19 | 30.5 | 6.9 | 0.45 | 0.45 | 4.00 | 4.00 |
| Jan 20 | 30.5 | 7.0 | 0.47 | 0.47 | 4.30 | 4.30 |
| Jan 21 | 30.6 | 7.1 | 0.49 | 0.49 | 4.50 | 4.50 |
| Jan 22 | 30.7 | 7.1 | 0.50 | 0.50 | 4.70 | 4.70 |
| Jan 23 | 30.8 | 7.2 | 0.52 | 0.52 | 4.90 | 4.90 |
| Jan 24 | 30.9 | 7.3 | 0.54 | 0.54 | 5.20 | 5.20 |
| Jan 25 | 31.0 | 7.4 | 0.55 | 0.55 | 5.40 | 5.40 |
| Jan 26 | 31.1 | 7.5 | 0.57 | 0.57 | 5.70 | 5.70 |
| Jan 27 | 31.2 | 7.6 | 0.59 | 0.59 | 5.90 | 5.90 |
| Jan 28 | 31.3 | 7.7 | 0.61 | 0.61 | 6.20 | 6.20 |
| Jan 29 | 31.4 | 7.8 | 0.63 | 0.63 | 6.50 | 6.50 |
| Jan 30 | 31.5 | 8.0 | 0.65 | 0.65 | 6.70 | 6.70 |
| Jan 31 | 31.6 | 8.1 | 0.67 | 0.67 | 7.00 | 7.00 |
Precipitation and snow add up through the month (/mo) and the year (/yr)
Weather history Arco - September 2026
| Day | HighºF | LowºF | Precip.inch |
|---|---|---|---|
| Sep 1 | 72.0 | 46.9 | 0.00 |
| Sep 2 | 69.1 | 48.0 | 0.00 |
| Sep 3 | 72.0 | 44.1 | 0.00 |
| Sep 4 | 75.9 | 44.1 | 0.00 |
| Sep 5 | 78.1 | 46.0 | 0.00 |
| Sep 6 | 66.9 | 39.0 | 0.00 |
| Sep 7 | 66.9 | 39.0 | 0.00 |
| Sep 8 | 72.0 | 35.1 | 0.00 |
| Sep 9 | 77.0 | 39.0 | 0.00 |
| Sep 10 | 79.0 | 39.9 | 0.00 |
| Sep 11 | 77.0 | 46.0 | 0.00 |
| Sep 12 | 80.1 | 41.0 | 0.00 |
| Sep 13 | 72.0 | 37.0 | 0.00 |
| Sep 14 | – | – | 0.00 |
| Sep 15 | 71.1 | 33.1 | 0.00 |
| Sep 16 | 79.0 | 42.1 | 0.00 |
| Sep 17 | 71.1 | 51.1 | 0.01 |
| Sep 18 | 68.0 | 44.1 | 0.02 |
| Sep 19 | 63.0 | 39.9 | 0.00 |
| Sep 20 | 75.9 | 39.9 | 0.00 |
| Sep 21 | 71.1 | 41.0 | 0.00 |
| Sep 22 | 64.9 | 45.0 | 0.00 |
| Sep 23 | 72.0 | 43.0 | 0.06 |
| Sep 24 | 77.0 | 39.9 | 0.00 |
| Sep 25 | 78.1 | 39.9 | 0.00 |
| Sep 26 | 68.0 | 43.0 | 0.00 |
| Sep 27 | 72.0 | 43.0 | 0.00 |
| Sep 28 | 70.0 | 42.1 | T |
| Sep 29 | 71.1 | 41.0 | 0.00 |
| Sep 30 | 73.9 | 39.9 | 0.00 |
The data for September 2026 is incomplete: some days or values are missing.
- –No data
- –Not yet observed or received
- TTrace, too small to measure
Observed extremes
- Highest max temperature80.1ºF · Sep 12
- Lowest max temperature63.0ºF · Sep 19
- Highest min temperature51.1ºF · Sep 17
- Lowest min temperature33.1ºF · Sep 15
Geo Arco - Idaho
Location
- Country
- United States
- State
- Idaho
- County
- Butte
- City
- Arco
- Zip Code
- 83213
- Elevation
- 5325 ft
- Longitude
- -113.33
- Latitude
- 43.60
- ICAO
- –
- IATA
- –