October 2006 Climatic Summary

The first two days of October were warm and dry before a cold front moved through on October 3. This system brought some light rain and cooler temperatures for October 3 through 5. High pressure again brought well above normal temperatures on October 6 and 7 before a colder than normal weather regime moved over the region from October 8 through 14. A strong upper level system brought light rain and snow to the plains on October 11, with 3 to 6 inches of snow falling in the northern Black Hills and Bear Lodge mountains. High pressure brought a brief warm-up for October 15 and 16 before cooler air once again moved into the region for October 17 through 22. A strong upper level system brought rain and snow and much colder temperatures from October 20 through 22, with the plains of northeastern Wyoming and northwestern South Dakota receiving 1 to 2 inches of snow and 6 to 10 inches of snow in the northern Black Hills and Bear Lodge mountains. October 23 through 25 saw seasonal temperatures and dry weather. A weak upper level trough brought some light rain and snow to northeastern Wyoming and far western South Dakota on October 26. A strong upper level ridge moved across the area from October 27 through 29 bringing dry weather and well above normal temperatures. On October 30 a cold front moved through the region bringing much colder temperatures for the last two days of October, and some light snow to the northern Black Hills and Bear Lodge mountains.

Temperatures averaged 3 to 5 degrees below normal in October, with every location reporting below normal temperatures. Averages ranged from 2.2 degrees below normal at Gillette 4SE in northeastern Wyoming to 5.8 degrees below normal at Wood.

October was a dry month, with only the Northern Black Hills and Bear Lodge mountains in northeastern Wyoming averaging near normal precipitation. Rainfall deficits for the month averaged 0.74 inches. On the plains of northeastern Wyoming and western South Dakota conditions were quite dry with precipitation averaging only 40 to 60 percent of normal, with some locations reporting less than 20 percent of normal precipitation. Precipitation ranged from 114 percent of normal at Deadwood 2NE to only 7 percent of normal at Winner. Snowfall was slightly above normal with 10 to 15 inches being reported in the northern Black Hills and Bear Lodge mountains. Snowfall on the plains of northeastern Wyoming and western South Dakota was generally 2 to 5 inches.                                                                                                                                                                                

LOCAL EXTREMES

Temperature Data

Rapid City

 

Lead

 

Gillette

 

 

Temperature

Date

Temperature

Date

Temperature 

Date

Maximum Temperature

84 degrees

1st

77 degrees

1st

81 degrees

1st

Minimum Temperature

7 degrees

31st

8 degrees

31st

7 degrees

31st

Precipitation Data

Rapid City

 

Lead

 

Gillette

 

Monthly  Data

Amount

Data

Amount

Date

Amount

Date

Precipitation

0.51 inches

 

1.78 inches

 

0.82 inches

 

Snowfall

3.0 inches

 

13.5 inches

 

1.6 inches

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

0.37 inches

20th

0.46 inches

20th

0.40 inches

20th

Maximum Snowfall

1.4 inches

11th, 20th

5.5 inches

21st

1.0 inches

11th

REGIONAL EXTREMES

Temperature Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

 

Temperature

Site

Date

Temperature

Site

Date

Maximum Temperature

91 degrees

Midland

7th

-4 degrees

Upton 14ENE

31st

Minimum Temperature

0 degrees

Medicine Mtn.

31st

85 degrees

Newcastle

2nd

Precipitation Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

Monthly Data

Amount

Site

Date

Amount

Site

Date

Maximum Precipitation

2.17 inches

Deadwood 2NE

 

1.57 inches

Rockypoint 1N

 

Minimum Precipitation

0.14 inches

Oelrichs

 

0.27 inches

Moorcroft

 

Maximum Snowfall

13.5 inches

Lead

 

5.1 inches

Echeta 2NW

 

Minimum Snowfall

0.0 inches

Edgemont 23NNW

 

Trace

Newcastle

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

0.80 inches

Bear Rdige

21st

0.59 inches

Hulett

21st

Maximum Snowfall

5.5 inches

Lead

21st

2.1 inches

Echeta 2NW

17th

MONTHLY RECORDS

LOCATION

DATE

NEW RECORD

OLD RECORD

DATE

 

 

NO RECORDS SET

 

 


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