May Climate Summary

..........MAY 2013 DRIER AND SLIGHTLY WARMER THAN NORMAL..........

MAY 2013 STARTED OUT COLD AND WINTRY AS A LARGE UPPER LEVEL TROUGH
OF LOW PRESSURE MOVED ACROSS THE ROCKY MOUNTAIN REGION. THIS SYSTEM
BROUGHT 3.4 INCHES OF SNOW TO DENVER INTERNATIONAL AIRPORT ON THE
FIRST AND SECOND WITH TEMPERATURES 20 DEGREES BELOW NORMAL DURING
THIS PERIOD. THE TEMPERATURE DROPPED TO 19 DEGREES ON THE MORNING OF
THE SECOND...WHICH TIES THE ALL TIME COLDEST TEMPERATURE FOR THE
MONTH OF MAY. TEMPERATURES REBOUNDED ON THE 3RD...HOWEVER THEY STILL
REMAINED AT BELOW NORMAL VALUES THROUGH THE 6TH. A WEAK UPPER LEVEL
DISTURBANCE BROUGHT OVER A THIRD OF AN INCH OF RAIN TO DENVER
INTERNATIONAL AIRPORT FROM THE 7TH THROUGH THE 8TH. A LARGE UPPER
LEVEL RIDGE OF HIGH PRESSURE WHICH AMPLIFIED OVER THE ROCKY MOUNTAIN
REGION BROUGHT MUCH WARMER AND DRIER WEATHER TO NORTH CENTRAL AND
NORTHEASTERN COLORADO BEGINNING ON THE 12TH. HIGH TEMPERATURES FROM
THE 13TH THROUGH THE 17TH WERE IN THE 80`S. THE HIGH TEMPERATURE OF
87 DEGREES ON THE 14TH TIED A RECORD FOR THE DATE AND HIGH OF 88
DEGREES ON THE 17TH WAS THE WARMEST DAY OF THE MONTH. TEMPERATURES
COOLED OFF TO NEAR NORMAL ON THE 18TH AS AN UPPER LEVEL STORM SYSTEM
MOVED INTO COLORADO FROM THE WEST. THIS SYSTEM BROUGHT ONLY LIGHT
PRECIPITATION TO DENVER. ON THE 24TH...A LARGE UPPER LEVEL STORM
SYSTEM DEVELOPED OVER THE PACIFIC NORTHWEST...WITH A DRY
SOUTHWESTERLY FLOW ALOFT OVER COLORADO. THIS PATTERN BROUGHT ABOVE
NORMAL TEMPERATURES TO THE REGION FROM THE 24TH THROUGH THE 28TH.
THIS SYSTEM FINALLY MOVED ACROSS COLORADO ON THE 29TH BRINGING
COOLER TEMPERATURES AND PRECIPITATION TO THE AREA.

TEMPERATURES:

THE AVERAGE TEMPERATURE FOR THE MONTH OF MAY WAS 57.9 DEGREES F
WHICH WAS 0.8 DEGREES ABOVE NORMAL. MAY OF 1934 WAS THE WARMEST MAY
ON RECORD WITH AN AVERAGE TEMPERATURE OF 64.6 DEGREES F. THE COLDEST
MAY ON RECORD WAS 48.7 BACK IN 1917.

THERE WERE NO DAYS IN WHICH THE MAXIMUM TEMPERATURE EXCEEDED 90
DEGREES...AND NO DAYS IN WHICH THE DAYTIME HIGH TEMPERATURE DID NOT
EXCEED 32 DEGREES F. THE HIGHEST TEMPERATURE OF THE MONTH WAS 88
DEGREES WHICH OCCURRED ON THE 17TH AND THE COLDEST TEMPERATURE OF
THE MONTH WAS 19 DEGREES ON THE MORNING OF THE 2ND.

BELOW IS A LIST OF TEMPERATURE RECORDS FOR MAY 2013:

DAILY RECORDS:

DATE        TEMPERATURE     TYPE OF RECORD     OLD RECORD   YEAR LAST SET
MAY 2ND     19 DEGREES        RECORD LOW       22 DEGREES       1954
MAY 14TH    87 DEGREES     TIED RECORD HIGH    87 DEGREES       1996

MONTHLY RECORDS:

DATE        TEMPERATURE     TYPE OF RECORD     OLD RECORD   YEAR LAST SET
MAY 2ND     19 DEGREES      TIED RECORD LOW    19  DEGREES   MAY 3RD 1907

PRECIPITATION:

PRECIPITATION FOR THE MONTH OF MAY WAS 0.82 INCHES...WHICH IS 1.30
INCHES BELOW THE NORMAL 0F 2.12 INCHES. THE WETTEST MAY ON RECORD
OCCURRED WAY BACK IN 1876 WHEN 8.57 INCHES OF PRECIPITATION WAS
RECORDED. THE 8.57 INCHES OF PRECIPITATION STILL HOLDS THE RECORD FOR THE
WETTEST MONTH IN DENVER WEATHER HISTORY. THAT SAME YEAR...PRESIDENT
ULYSSES S. GRANT ISSUED THE PROCLAMATION TO MAKE COLORADO THE 38TH STATE OF
THE UNION. THE DRIEST MAY ON RECORD OCCURRED BACK IN 1974...WHEN
ONLY 0.06 INCHES OF PRECIPITATION WAS RECORDED.

3.4 INCHES OF SNOW WAS RECORDED DURING THE MONTH...WHICH IS 2.3
INCHES ABOVE THE NORMAL OF 1.1 INCHES. THE SNOWIEST MAY ON RECORD OCCURRED
WAY BACK IN 1898 WHEN 15.5 INCHES OF SNOW WAS RECORDED.

ELEVEN THUNDERSTORMS WERE OBSERVED AT DENVER INTERNATIONAL AIRPORT DURING
THE MONTH. THERE WAS ONLY ONE DAY WITH DENSE FOG WITH A VISIBILITY AT OR
BELOW 1/4 MILE DURING THE MONTH. A PEAK WIND OF 53 MPH FROM A
SOUTHWESTERLY DIRECTION WAS RECORDED ON THE 26TH.



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