September 2013 Climatic Summary
 
September temperatures across the entire region were nearly 5 degrees above average for the month. The location with the warmest departure from average was Dupree, which was 8.1 degrees above normal, while the location with the coolest departure was Camp Crook, at 3.3 degrees above normal.
 
Precipitation in September averaged around 119 percent of normal across the entire area.  Many locations across Northeast Wyoming, the northern Black Hills and northwestern South Dakota were well above average for precipitation. Bison had 5.29 inches of precipitation for September, which was 417 percent of normal. The southwest and south central South Dakota plains were below normal for September precipitation, with most locations receiving between 40 and 80 percent of average precipitation.
 
 Early season snow fell across parts of Northeast Wyoming in September. Gillette received around two inches of snow, while the Wright area picked up around four inches of snow.
 
September storm summary...
 
September 8th – Strong to severe thunderstorms moved across Northeast Wyoming and western South Dakota during the afternoon and evening hours. Most of the hail ranged from nickel sized to around half dollar sized. The strongest storm produced softball sized hail 4 miles northwest of Rozet, Wyoming.
 
September 18th – Another round of thunderstorms crossed Northeast Wyoming and northwest South Dakota in the afternoon. Nickel to half dollar sized hail and wind gusts to 60 mph were reported.
 
September 26th – Showers and storms developed across the Black Hills area late in the afternoon and evening. Nickel to half dollar sized hail was reported at several locations.
 
September 27th – Early season snow fell across parts of Northeast Wyoming late in the month. Snowfall accumulations of 1 to 4 inches were reported in many locations.
 
 
LOCAL EXTREMES
Rapid City
Lead
Gillette
Temperature
Temperature
Date
Temperature
Date
Temperature
Date
Max. Temp.
94
7th
87
17th
98
4th
Min. Temp.
39
28th
36
27th, 28th
32
27th
Precipitation
Rapid City
Lead
Gillette
Monthly Data
Amount
Date
Amount
Date
Amount
Date
Precipitation
0.95
 
3.70
 
2.37
 
Snowfall
0.0
 
0.0
 
2.0
 
Daily Data
Amount
Date
Amount
Date
Amount
Date
Max. Precipitation
0.54
8th
0.95
25th
0.78
26th
Max. Snowfall
 
 
 
 
2.0
27th

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