Hourly Weather in Keystone, Montana, United States
∙ View on Radar5 min
1 hour
6 hours
1 day
Wind
13 km/h
Light
17 km/h
Breezy
18 km/h
Breezy
19 km/h
Breezy
18 km/h
Breezy
18 km/h
Breezy
17 km/h
Breezy
14 km/h
Light
12 km/h
Light
Humidity
35%
Dry
32%
Dry
29%
Very dry
24%
Very dry
22%
Very dry
22%
Very dry
23%
Very dry
23%
Very dry
22%
Very dry
Visibility
16 km
Good
15 km
Good
16 km
Good
16 km
Good
16 km
Good
16 km
Good
16 km
Good
16 km
Good
16 km
Good
Pressure
1009 hPa
Normal
1009 hPa
Normal
1009 hPa
Normal
1009 hPa
Low
1008 hPa
Low
1008 hPa
Low
1007 hPa
Low
1007 hPa
Low
1007 hPa
Low
Clouds
0%
0%
0%
0%
0%
0%
0%
0%
0%
Dew point
10°
9°
9°
6°
5°
5°
6°
6°
5°
UV Index
7
8
9
8
6
4
2
1
0
Air quality
83
Moderate
84
Moderate
84
Moderate
85
Moderate
86
Moderate
91
Moderate
55
Moderate
53
Moderate
52
Moderate
Pollen index
Tree
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
Weed
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
Grass
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
Pollutants
Low risk
High risk
PM10
43.1 μg/m3
43.1 μg/m3
43.1 μg/m3
43.1 μg/m3
43.1 μg/m3
45.3 μg/m3
7.8 μg/m3
7.3 μg/m3
7.1 μg/m3
PM25
26.1 μg/m3
26.3 μg/m3
26.6 μg/m3
27 μg/m3
27.4 μg/m3
30.1 μg/m3
7.6 μg/m3
7.1 μg/m3
7 μg/m3
NO2
0.3 ppb
0.3 ppb
0.2 ppb
0.2 ppb
0.2 ppb
0.2 ppb
0.2 ppb
0.6 ppb
1.1 ppb
SO2
0.3 ppb
0.3 ppb
0.2 ppb
0.2 ppb
0.2 ppb
0.2 ppb
0.2 ppb
0.2 ppb
0.2 ppb
CO
0.2 ppb
0.2 ppb
0.1 ppb
0.1 ppb
0.1 ppb
0.1 ppb
0.1 ppb
0.1 ppb
0.1 ppb
O3
22.9 ppb
25.5 ppb
29 ppb
33.1 ppb
37.4 ppb
44.5 ppb
60.3 ppb
58.3 ppb
56.1 ppb