July 2010 Climatic Summary

July  temperatures were near normal, averaging 0.5 degrees below normal across the region. Cottonwood was the warm spot averaging 1.3 degrees above normal. The cold spot was at Newcastle in northeast Wyoming, where temperatures averaged 4.2 degrees below normal.
Precipitation in July was near normal. The wettest area was across northwest South Dakota where precipitation averaged 175 to 225 percent of normal. The driest area was across the northern and central Black Hills where precipitation was 40 to 50 percent of normal. The wet spot was in Camp Crook where precipitation was 237 percent of normal. Porcupine 11N was the dry spot with only 33 percent of normal precipitation. The precipitation deficit for the month averaged 0.12 inches.
No snowfall was reported in July.
 

July storm summary...

On July 1…An isolated severe thunderstorm produced 60 mph winds in Pine Haven in Crook County, and 4 miles northwest of Bear Butte State Park in Meade County.
 
On July 2…An isolated severe thunderstorm produced 60 mph winds in Box Elder in Pennington County.
 
On July 3…An upper level disturbance brought severe thunderstorms to south central South Dakota. The largest hail reported was the size of quarters in Harrington and 6 miles south of Tuthill in Bennett County. There were numerous reports of winds in excess of 60 mph, with the strongest gust reported at 78 mph, 2 miles southeast of Okreek in Todd County.
 
On July 10…An isolated severe thunderstorm brought Quarter size hail and 60 mph winds to Colome in Tripp County. Other thunderstorms with heavy rain dropped 2 to inches of rain across northern Jackson County and east central Tripp County causing minor flooding of small creeks and streams. No reports of damaged were received due to the minor flooding.
 
On July 11…Isolated severe thunderstorms dropped quarter size hail 4 miles southwest of Colome in Tripp County, and in Custer, and produced 60 mph winds 7 miles south of Rozet in Campbell County. Scattered thunderstorms dropped 2 to 3 inches of rain from Rochford to Pringle. Small creeks and streams rose quickly from the runoff, with minor low-land flooding along Spring Creek near Hill City.
 
On July 12…An isolated severe thunderstorm dropped golf ball size hail on Hisega and Rockerville in Pennington County.
 
On July 13…An isolated severe thunderstorm dropped large hail and produced damaging winds in Harding County late at night. Hail to the size of golf balls and 70 mph winds were reported just south of Ralph.
 
On July 18…An upper level disturbance brought large hail and damaging winds to northeast Wyoming and northwest South Dakota. The largest hail reported was 1.25 inches in diameter, 5 miles northwest of Sundance in Crook County. The strongest wind gust reported was 69 mph, 8 miles northwest of Rockypoint in Campbell County.   Minor flooding also occurred in Rapid City as heavy rain and hail overwhelmed storm drains leading to ponding of water on several city streets. Rapid Creek rose one to three feet from Rapid City to Farmingdale due to runoff from the heavy rain. Heavy rains of 2 to 4 inches late caused flooding of low lying areas in eastern Pennington, southeastern Meade and southern Haakon counties, with the flooding continuing into the 19th.
 
On July 19…A strong upper level disturbance brought widespread severe weather to region. Across northeast Wyoming there were numerous reports of large hail, with the largest hail reported at 4.25 inches in diameter 5 miles northeast of Rozet in Campbell County. In western South Dakota there were numerous reports of large hail and damaging winds. The largest hail to fall was the size of golf balls in Butte and Meade counties where there were several reports. The strongest wind gust reported was 75 mph in Wall in Pennington County.
 
On July 20…Isolated severe thunderstorms brought large hail and damaging winds to northeast Wyoming. The largest hail reported was the size of golf balls near Oshoto and New Haven in Crook County. The strongest winds reported were 60 mph, 8 miles north of Hulett in Crook County.
 
On July 21…A strong upper level disturbance brought large hail, damaging winds and heavy rains to northeast Wyoming and northwest South Dakota. There were numerous reports of winds in excess of 60 mph across northeast Wyoming, with the strongest winds of 76 mph being reported at Echeta in western Campbell County. The large hail to fall was the size of golf balls, 12 miles west of Upton in Weston County. Heavy rains dropped 2.5 to 5 inches of rain over northwestern South Dakota. The heavy rain covered most of Harding and Perkins Counties. Minor flooding of small creeks and streams were reported and water ran over a few rural roads when water was unable to quickly pass through small culverts already flowing at maximum capacity.  Heavy rains produced minor flooding in Moorcroft and Upton when over 2 inches fell in an hour.
 
On July 22…Scattered thunderstorms produced severe weather across Fall River County. There were numerous reports of hail in excess of 1.0 inches in diameter, with the largest hail being the size of golf balls 10 miles west of Ardmore. Winds of 60 mph were also reported in Ardmore where 6 inch diameter tree branches were broken off trees.
 
On July 23…Scattered thunderstorms produced severe weather across Perkins County. Hail to the size of golf balls were reported in White Butte, with 60 mph winds reported near Bison and Lodgepole. Heavy rains also caused flooding from White Butte to Lemmon along Highway 12 in northeastern Perkins County. In Lemmon, several streets were flooded when one to two inches of rain fell in less than an hour.
 
On July 25…An isolated severe thunderstorm produced 65 mph winds 10 miles southeast of Wright in southern Campbell County.
 
On July 26…Scattered thunderstorms produced large hail across northeast Wyoming and in the northern Black Hills. The largest hail to fall was the size of golf balls 2 miles northeast of Deadwood.
 
On July 29…Scattered severe thunderstorms produced large hail and 60 mph winds across southwest South Dakota and over the central Black Hills. The largest hail fell in Rockerville, where 2.5 inch diameter hail broke numerous windshields and windows. Heavy rains caused minor flooding on the Cheyenne River Reservation in southern Ziebach County. Rainfall amounts of 2 to 3 inches in three hours caused minor flooding along Cherry Creek, Red Scaffold Creek and Rattlesnake Creek. Minor flooding also occurred along Spring Creek from Highway 16 downstream to south of Folsom.

On July 31…An upper level disturbance produced severe weather across northwest South Dakota. There were numerous reports of large hail and winds of 60 mph. The largest hail was 2 inches in diameter and fell near Glad Valley in Ziebach County. 

LOCAL EXTREMES

Temperature Data

Rapid City

 

Lead

 

Gillette

 

 

Temperature

Date

Temperature

Date

Temperature 

Date

Maximum Temperature

98 degrees

31st

90 degrees

31st

100 degrees

31st

Minimum Temperature

46 degrees

7th

40 degrees

7th

41 degrees

7th

Precipitation Data

Rapid City

 

Lead

 

Gillette

 

Monthly Data

Amount

Data

Amount

Date

Amount

Date

Precipitation

1.66 inches

 

1.10 inches

 

2.32 inches

 

Snowfall

0.0 inches

 

0.0 inches

 

0.0 inches

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

0.68 inches 

29th

0.25 inches

6th

0.65 inches

21st

Maximum Snowfall

0.0 inches

 

0.0 inches

 

0.0 inches

 

 
 REGIONAL EXTREMES

Temperature Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

 

Temperature

Site

Date

Temperature

Site

Date

Maximum Temperature

104 degrees

Mission

18th

101 degrees

Colony
Dillinger

31st
31st

Minimum Temperature

37 degrees

Pactola Dam

7th

36 degrees

Upton 14 ENE

7th

Precipitation Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

Monthly Data

Amount

Site

Date

Amount

Site

Date

Maximum Precipitation

5.66 inches

Lemmon

 

3.35 inches

Upton

 

Minimum Precipitation

0.88 inches

Porcupine 11N

 

1.13 inches

Sundance

 

Maximum Snowfall

0.0 inches

 

 

0.0 inches

 

 

Minimum Snowfall

0.0 inches

 

 

0.0 inches

 

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

2.60 inches

Ludlow 3SSE

21st

1.80 inches

Upton

21st

Maximum Snowfall

0.0 inches

 

 

0.0 inches

 

 

 
 MONTHLY RECORDS

LOCATION

DATE

NEW RECORD

OLD RECORD

DATE

 

 

NO RECORDS SET

 

 

 

 Return to Climate Summaries


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