A Statistical Preview of Denver's June Weather

...A STATISTICAL PREVIEW OF DENVER’S JUNE WEATHER...
 
JUNE IN DENVER IS A MONTH WHICH RESTS BETWEEN THE COOL RAINS OF MAY AND THE WARM ONSET OF THE SECONDARY WET SEASON KNOWN AS THE NORTH AMERICAN MONSOON. JUNE IN DENVER, ALONG WITH THE REST OF THE FRONT RANGE AND EASTERN PLAINS, IS A MONTH WHICH CAN RECEIVE THE MOST INTENSE SEVERE WEATHER OF THE YEAR AND USUALLY COMES IN THE FORM OF LARGE HAIL. LOW LEVEL GULF MOISTURE OFTEN FINDS IT'S WAY INTO EASTERN COLORADO ON THE WESTERN EDGE OF THE CENTRAL UNITED STATES LOW-LEVEL JET. THE WEAKEST OF UPPER LEVEL DISTURBANCES IN WEST TO NORTHWESTERLY FLOW ALOFT, RIDING OVER THE MOISTURE AT THE LOW LEVELS, CAN IGNITE AN AFTERNOON AND EVENING OF SEVERE WEATHER RANGING FROM HEAVY RAIN TO TENNIS BALL SIZED HAIL TO TORNADOES.
 
WITH DENVER'S ANNUAL NORMAL TEMPERATURES PEAKING IN LATE JULY, A STEADY TREND OF WARMING TEMPERATURES THROUGH LATE JUNE NORMALLY OCCURS. DENVER`S MONTHLY MEAN TEMPERATURE FOR JUNE IS 67.4 DEGREES (1981-2010 AVERAGES) AND IS DENVER`S 3RD WARMEST MONTH OF THE YEAR BEHIND JULY AND AUGUST RESPECTIVELY. JUNE STARTS THE MONTH WITH A NORMAL HIGH OF 77 DEGREES AND ENDS WITH A NORMAL HIGH OF 87 DEGREES. FOR LOW TEMPERATURES, THE MONTH BEGINS WITH A NORMAL OF 48 DEGREES AND FINISHES WITH A NORMAL OF 56.
 
THE WARMEST TEMPERATURE EVER RECORDED DURING THE MONTH OF JUNE, SINCE RECORDS BEGAN IN 1872, WAS A VERY RECENT 105 DEGREES ON BOTH 25TH AND 26 TH DAY OF 2012. JUNE'S COLDEST TEMPERATURE EVER RECORDED IN DENVER WAS 30 DEGREES AND OCCURRED ON THE 2ND DAY OF 1951.
 
JUNE: DENVER`S TOP 5 COLDEST (MEAN TEMPERATURES):
 
60.6 DEGREES 1967
60.9         1951
61.0         1928
61.5         1969
61.6         1904
 
JUNE: DENVER`S TOP 5 WARMEST (MEAN TEMPERATURES):
 
75.0 DEGREES 2012
73.5         1994
73.4         1956
72.8         1933, 2006
72.6         1990
 
SNOW IS VERY RARE IN JUNE, BUT NOT OUT OF THE QUESTION FOR THE MILE HIGH CITY AS THE LAST OF THE COLD SEASON TROUGHS OF LOW PRESSURE AND ASSOCIATED COLD FRONTS CLIP THE NORTHERN SECTION OF THE STATE. SNOW HAS OCCURRED ONLY 7 TIMES IN DENVER SINCE 1882 WITH THE LAST OCCURRENCE IN 1974 WITH A TRACE.
 
JUNE: DENVER`S SNOWIEST
 
 0.4 INCHES 1919
 0.3        1951
 T         1917, 1937, 1947, 1974
 
WITH THE POSSIBILITY OF SEVERE WEATHER IN FULL FORCE DURING THE MONTH OF JUNE, RAINFALL TOTALS FROM STRONG THUNDERSTORMS ARE THE MEASURE OF INTEREST. WITH JUNE BRACKETED BY THE WETTEST MONTHS OF MAY AND JULY, DENVER'S 10TH WETTEST MONTH IN HISTORY OCCURRED IN JUNE, 1882. THE 4TH HIGHEST 24 HOUR PRECIPITATION TOTAL IN DENVER HISTORY HOWEVER, OCCURRED ON JUNE 11TH, 1970 AS 3.16 INCHES OF RAIN FELL. THIS WAS BEHIND THE TOP 3 OF 6.50 INCHES ON MAY 22ND OF 1876, 3.27 INCHES ON MAY 6TH OF 1973 AND 3.25 INCHES APRIL 13TH, 1967.
 
JUNE: DENVER`S WETTEST
 
4.96 INCHES 1882
4.86        2009
4.69        1967
4.14        1965
3.99        2005
 
JUNE: DENVER`S DRIEST
 
 T INCHES 1890
0.08        1916
0.09        1881, 1980
0.12        1952, 2006
0.13        1893
 
                    ...THE OUTLOOK FOR JUNE 2014...
 
WITH DENVER AND THE FRONT RANGE RECEIVING WELL ABOVE NORMAL PRECIPITATION FOR MAY, JUNE LOOKS TO HAVE AN ABOVE NORMAL BIAS AS WELL. AS WE LOOK TOWARD THE MONTH WHICH BRINGS ON THE SUMMER HEAT IN COLORADO, THE MID TO LONG RANGE FORECAST MODELS INDICATE A PROGRESSIVE PATTERN OF WEAK RIDGES AND TROUGHS WITH THE GULF OPEN TO THE HIGH PLAINS STATES. THE CLIMATE PREDICTION CENTER'S ONE MONTH OUTLOOK FOR THE REGION CALLS FOR NEAR NORMAL TEMPERATURES. FOR PRECIPITATION, A BIAS TOWARD A HIGHER CHANCE FOR ABOVE NORMAL PRECIPITATION.
 
                       ...JUNE STATISTICS...
 
...TEMPERATURES (1981-2010 NORMALS)...
 
AVERAGE HIGH........................... 82.4
AVERAGE LOW............................ 52.3
MONTHLY MEAN........................... 67.4
DAYS WITH HIGH 90 OR ABOVE.............   8 (7.9)
DAYS WITH HIGH 32 OR BELOW.............   0 (0.0)
DAYS WITH LOW 32 OR BELOW..............   0 (<0.1)
DAYS WITH LOWS ZERO OR BELOW...........   0 (0.0)
 
...PRECIPITATION...
 
MONTHLY MEAN...........................   1.98 INCHES
DAYS WITH MEASURABLE PRECIPITATION.....   8 (8.4)
AVERAGE SNOWFALL........................ 0.0 INCHES
 
...MISCELLANEOUS JUNE AVERAGES...
 
HEATING DEGREE DAYS.................... 133
COOLING DEGREE DAYS....................   62
WIND SPEED (MPH).......................    8.9*
WIND DIRECTION......................... SOUTH*
DAYS WITH THUNDERSTORMS................   10* (9.9)
DAYS WITH DENSE FOG....................    0* (<0.4)
PERCENT OF SUNSHINE....................   70*
(NOTE: SUNSHINE DATA ARE NO LONGER COLLECTED AS OF OCTOBER 1, 2009)
 
* = 1971-2002 NORMALS
 
...JUNE EXTREMES...
 
RECORD HIGH............................ 104 DEGREES ON 6/26/1994
RECORD LOW............................. 30 DEGREES ON 6/2/1951
WARMEST................................ 73.5 DEGREES IN 1994
MAXIMUM COOLING DEGREE DAYS............ 263 IN 1994
MINIMUM COOLING DEGREE DAYS............ 28 IN 2003
COLDEST................................ 60.6 DEGREES IN 1967
MAXIMUM HEATING DEGREE DAYS............ 164 IN 1951
MINIMUM HEATING DEGREE DAYS............   0 IN 1952, 1956 & 1977
WETTEST................................   4.96 INCHES IN 1882
DRIEST.................................   T IN 1890
 
WFO Boulder


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