174  
CXUS51 KBUF 052130  
CLMROC  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BUFFALO NY  
141 PM EDT SAT AUG 1 2020  
   
...............................
 
 
   
..THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF JULY 2020
 
 
CLIMATE NORMAL PERIOD 1981 TO 2010  
CLIMATE RECORD PERIOD 1871 TO 2020  
 
WEATHER OBSERVED NORMAL DEPART LAST YEAR'S  
VALUE DATE(S) VALUE FROM VALUE DATE(S)  
NORMAL    
............................................................
 
 
TEMPERATURE (F)  
RECORD  
HIGH 102 07/10/1936  
07/09/1936  
LOW 24 07/01/2016  
HIGHEST 97 07/09 92 07/20  
07/16  
LOWEST 59 07/31 53 07/08  
07/05  
AVG. MAXIMUM 85.9 81.0 4.9 83.9  
AVG. MINIMUM 65.3 60.7 4.6 64.3  
MEAN 75.6 70.8 4.8 74.1  
DAYS MAX >= 90 8 2.3 5.7 5  
DAYS MAX <= 32 0 0.0 0.0 0  
DAYS MIN <= 32 0 0.0 0.0 0  
DAYS MIN <= 0 0 0.0 0.0 0  
 
PRECIPITATION (INCHES)  
RECORD  
MAXIMUM 9.70 1947  
MINIMUM 0.43 1933  
TOTALS 5.54 3.33 2.21 2.64  
DAYS >= .01 10 10  
DAYS >= .10 5 4  
DAYS >= .50 2 2  
DAYS >= 1.00 2 1  
GREATEST  
24 HR. TOTAL 3.18 07/11 TO 07/11  
 
SNOWFALL (INCHES)  
RECORDS  
TOTAL MM MM  
TOTALS 0.0 0.0 0.0 0.0  
SINCE 7/1 0.0 0.0 0.0 0.0  
SNOWDEPTH AVG. 0 MM MM 0  
DAYS >= 1.0 0 0.0 0.0 0  
GREATEST  
SNOW DEPTH 0 MM 0 MM  
24 HR TOTAL 0.0 MM  
 
DEGREE_DAYS  
HEATING TOTAL 0 12 -12 0  
SINCE 7/1 0 12 -12 0  
COOLING TOTAL 337 193 144 291  
SINCE 1/1 547 329 218 384    
.............................................................
 
 
WIND (MPH)  
AVERAGE WIND SPEED 7.5  
HIGHEST WIND SPEED/DIRECTION 25/250  
HIGHEST GUST SPEED/DIRECTION 33/270 DATE 07/27  
 
SKY COVER  
POSSIBLE SUNSHINE (PERCENT) MM  
AVERAGE SKY COVER 0.50  
NUMBER OF DAYS FAIR 5  
NUMBER OF DAYS PC 22  
NUMBER OF DAYS CLOUDY 3  
 
AVERAGE RH (PERCENT) 67  
 
WEATHER CONDITIONS. NUMBER OF DAYS WITH  
THUNDERSTORM 6 MIXED PRECIP 0  
HEAVY RAIN 2 RAIN 6  
LIGHT RAIN 9 FREEZING RAIN 0  
LT FREEZING RAIN 0 HAIL 0  
HEAVY SNOW 0 SNOW 0  
LIGHT SNOW 0 SLEET 0  
FOG 8 FOG W/VIS <= 1/4 MILE 0  
HAZE 3  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
   
..PERSISTENT SUMMER HEAT
 
 
RELENTLESS HEAT WAS UPON WESTERN NEW YORK THROUGH THE MONTH OF JULY,  
AND FOR THE FIRST TIME IN RECORDED HISTORY, A MONTH FEATURED EVERY  
DAY AVERAGING 70F OR GREATER. THE PINNACLE OF THE HEAT WAVE WAS  
EARLY IN THE MONTH WHEN THE TEMPERATURE SOARED TO 97F/9TH AND  
93F/10TH. THE 97F READING WAS 5 DEGREES REMOVED FROM THE ALL-TIME  
WARMEST TEMPERATURE RECORDED AT ROCHESTER, AND WAS THE WARMEST  
TEMPERATURE SINCE 98F ON JULY 21ST 2011. A DRY GROUND AIDED IN THE  
BUILDING HEAT EARLY IN THE MONTH, THOUGH SEVERAL BOUTS OF  
THUNDERSTORMS AND RAIN MID MONTH ONWARD ALLOWED VEGETATION TO  
FRESHEN.  
 
THE TEMPERATURE AVERAGED 75.6F IN JULY. THIS IS TIED FOR THE 3RD  
WARMEST JULY ON RECORD, AND 4TH WARMEST ALL-TIME MONTHLY TEMPERATURE  
ON RECORD. FROM JULY 5TH TO JULY 10TH THE MAXIMUM TEMPERATURE  
REACHED INTO THE 90S EVERY DAY...AND THESE 6 CONSECUTIVE 90 DEGREE  
DAYS ARE TIED FOR 5TH PLACE FOR CONSECUTIVE DAYS IN THE 90S. THE  
'COOLEST' TEMPERATURE THIS MONTH WAS ONLY 59F, TIED FOR THE WARMEST  
MONTHLY MINIMUM TEMPERATURE ON RECORD. THE OTHER TWO MONTHS WHEN THE  
TEMPERATURE DIPPED TO ONLY 59F WERE JULY OF 1897, AND JULY OF 1887.  
THOUGH HEAT GRIPPED WESTERN NEW YORK THIS MONTH, THERE WERE NO  
RECORDS BROKEN.  
 
PRECIPITATION TOTALED ABOVE NORMAL FOR THE MONTH, WITH THE 5.54  
INCHES OF PRECIPITATION OVER 2 INCHES ABOVE NORMAL. THE  
PRECIPITATION HIGHLIGHT THIS MONTH OCCURRED ON THE 11TH WHEN 3.18  
INCHES OF RAIN FELL. THOUGH NOT A DAILY RECORD (3.26/1897) IT WAS  
THE 10TH GREATEST CALENDAR DAY PRECIPITATION EVENT ON RECORD. HEAVY  
RAINS ALSO FELL ON THE 16TH, WITH 1.70 INCHES RECORDED. THOUGH JULY  
WAS THE 12TH WETTEST ON RECORD, THE 10 DAYS WITH MEASURABLE RAINFALL  
WERE 1 LESS THAN NORMAL. THE DRY ANTECEDENT CONDITIONS ALLOWED FOR  
LITTLE IMPACTS FROM THIS RAIN EVENT.  
 
HIGH PRESSURE GRIPPED THE EASTERN GREAT LAKES REGION THE FIRST 10  
DAYS OF THE MONTH. WITH LITTLE RAINFALL, THE GROUND AND VEGETATION  
DRIED, AND ROCHESTER HAD THE HEAT CRESCENDO ON THE 9TH AT 97F. A  
WEAK COLD FRONT CROSSED WESTERN NEW YORK ON THE 10TH, AND THIS  
BROUGHT AN END TO THE HEAT WAVE WHILE ALSO PRODUCING A FEW ISOLATED  
STRONG THUNDERSTORMS. DRENCHING THUNDERSTORMS CONTINUED ON THE 11TH,  
WITH SEVERAL CELLS PASSING OVER ROCHESTER BRINGING FLASH FLOODING.  
A MORE WIDESPREAD SEVERE EVENT OCCURRED ON THE 16TH OF THE MONTH  
WITH DAMAGING WINDS AND HEAVY DOWNPOURS OF RAIN. THESE RAINS BROUGHT  
DROUGHT RELIEF, WITH PARCHED GRASS RETURNING BACK TO LIFE. A WARM  
FRONT LIFTED ACROSS WESTERN NEW YORK ON THE 22ND, PRODUCING RAIN  
SHOWERS AND GARDEN VARIETY THUNDERSTORMS. ANOTHER ROUND OF SEVERE  
WEATHER CLOSED OUT THE MONTH ON THE 29TH AS SEVERAL SUPERCELLS LEFT  
A TRACK OF DAMAGE...ONE FROM THE SOUTHERN TIER TO THE FINGER LAKES  
REGION AND ANOTHER ALONG THE SOUTHERN LAKE ONTARIO SHORELINE. THE  
SUPERCELL THAT TRACKED TO THE SOUTH OF LAKE ONTARIO BROUGHT A WEAK  
TORNADO TO SOUTHERN MONROE COUNTY DURING THE EARLY EVENING HOURS OF  
THE 29TH.  
 
LAKE ONTARIO QUICKLY WARMED THE FIRST HALF OF THE MONTH, AND THE  
WARMEST WATER TEMPERATURE READING OCCURRED AT MONTHS END, WITH A  
READING OF 78F. WINDS WERE A TICK ABOVE NORMAL FOR THE MONTH, THOUGH  
THERE WERE LITTLE GUSTS, WITH THE HIGHEST BEING JUST 33 MPH ON  
MONDAY THE 27TH.  
 
IN ALL, JULY WAS A HOT MONTH WITH SCATTERED DRENCHING STORMS TO  
CLOSE OUT THE MONTH.  
 

 
 
THOMAS  
 

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab NY Page Main Text Page