437
CXUS51 KBUF 031012
CLMROC
CLIMATE REPORT
NATIONAL WEATHER SERVICE BUFFALO NY
826 AM EDT THU MAY 01 2025
...............................
..THE ROCHESTER NY CLIMATE SUMMARY FOR THE MONTH OF APRIL 2025
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1871 TO 2025
WEATHER OBSERVED NORMAL DEPART LAST YEAR'S
VALUE DATE(S) VALUE FROM VALUE DATE(S)
NORMAL
............................................................
TEMPERATURE (F)
RECORD
HIGH 93 04/28/1990
04/30/1970
LOW 11 04/04/1879
HIGHEST 84 04/29 79 04/09
LOWEST 21 04/09 28 04/26
AVG. MAXIMUM 57.6 56.6 1.0 57.8
AVG. MINIMUM 37.7 37.1 0.6 40.5
MEAN 47.7 46.8 0.9 49.1
DAYS MAX >= 90 0 0.0 0.0 0
DAYS MAX <= 32 0 0.4 -0.4 0
DAYS MIN <= 32 7 9.9 -2.9 4
DAYS MIN <= 0 0 0.0 0.0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 5.81 2011
MINIMUM 0.94 1884
TOTALS 3.51 2.99 0.52 4.35
DAYS >= .01 14 16
DAYS >= .10 7 11
DAYS >= .50 2 2
DAYS >= 1.00 1 2
GREATEST
24 HR. TOTAL 1.57 04/02 TO 04/03 1.22 04/03 TO 04/04
SNOWFALL (INCHES)
RECORDS
TOTAL 23.8 1901
TOTALS 2.0 3.0 -1.0 0.9
SINCE 7/1 88.3 101.9 -13.6 MM
SNOWDEPTH AVG. 0 0
DAYS >= 1.0 1 1.0 0.0 0
DAYS >= 0.1 3 2
GREATEST
SNOW DEPTH 1R 04/16 1 04/05
24 HR TOTAL 1.2R 04/08 TO 04/08 MM
DEGREE DAYS
HEATING TOTAL 511 549 -38 467
SINCE 7/1 5579 5993 -414 MM
COOLING TOTAL 0 4 -4 0
SINCE 1/1 0 4 -4 MM
............................................................
WIND (MPH)
AVERAGE WIND SPEED 10.6
HIGHEST WIND SPEED/DIRECTION 40/260
HIGHEST GUST SPEED/DIRECTION 56/260 DATE 04/29
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.73
NUMBER OF DAYS FAIR 1
NUMBER OF DAYS PC 13
NUMBER OF DAYS CLOUDY 16
AVERAGE RH (PERCENT) 61
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 5 MIXED PRECIP 0
HEAVY RAIN 4 RAIN 4
LIGHT RAIN 16 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 1
LIGHT SNOW 7 SLEET 1
FOG 10 FOG W/VIS <= 1/4 MILE 1
HAZE 2
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
.. A COOL START TO APRIL, WITH A MILD FINISH
COOL AND UNSETTLED CONDITIONS DOMINATED THE FIRST HALF OF APRIL WITH
ALL BUT TWO DAYS RECORDING AT LEAST A TRACE OF PRECIPITATION.
MEASURABLE SNOW OCCURRED THREE DAYS, WITH THE GREATEST OCCURRING ON
THE 8TH WITH JUST OVER AN INCH OF SNOW COATING THE GROUNDS AROUND
METRO ROCHESTER. THE FINAL TWELVE DAYS OF THE MONTH FEATURED A MILD
TREND, PUSHING THE OVERALL AVERAGE TEMPERATURE FOR THE MONTH TO
AROUND A DEGREE ABOVE NORMAL.
THE TEMPERATURE AVERAGED 47.7°F THIS MONTH, WHICH IS 0.9 DEGREES
ABOVE NORMAL. THERE WERE 13 DAYS FEATURING BELOW NORMAL TEMPERATURE,
WITH 11 OF THESE DAYS OCCURRING WITHIN THE FIRST 17 DAYS OF THE
MONTH. THE WARMEST DAY OF THE MONTH OCCURRED ON THE 29TH, WITH THE
84°F READING THE FIRST SUCH DAY TOPPING THE 80F MARK. THIS FIRST
80°F TEMPERATURE OCCURRED ONE DAY EARLIER THAN THE LONG TERM NORMAL.
THE COLDEST TEMPERATURE THIS MONTH WAS 21°F, WHICH OCCURRED ON THE
9TH. THIS IS THE COLDEST APRIL TEMPERATURE IN 9 YEARS.
PRECIPITATION TOTALED 3.51 INCHES, WHICH IS A HALF AN INCH ABOVE
NORMAL. THE WETTEST DAY OCCURRED ON THE 2ND WITH A NEW DAILY RECORD
1.53 INCHES OF PRECIPITATION. THE 14 DAYS WITH MEASURABLE
PRECIPITATION MATCHES THE APRIL NORMAL. MEASURABLE SNOW THIS MONTH
TOTALED 2.0 INCHES WHICH IS AN INCH BELOW NORMAL. DATING BACK TO
1884 EVERY APRIL HAS FEATURED AT LEAST A TRACE OF SNOWFALL, EXCEPT
FOR THE 1997-98 SEASON.
COOL, NORTHWEST FLOW BEGAN THE MONTH OF APRIL WITH A FEW FLURRIES OF
SNOW AROUND. A STORM SYSTEM LIFTED OUT OF THE CENTRAL PLAINS ON THE
2ND, WITH A PAIR OF WARM FRONTS BRINGING INITIALLY A LITTLE SNOW,
AND THEN AN ALL DAY RAIN EVENT TO WESTERN NEW YORK. UPPER LEVEL
TROUGHING THEN MAINTAINED UNSETTLED AND COOL WEATHER THROUGH A GOOD
PORTION OF THE FIRST HALF OF APRIL. DAY-TO-DAY PRECIPITATION EVENTS
NEVER TOTALED MUCH RAINFALL OR SNOWFALL THOUGH. TEMPERATURES SPIKED
INTO THE LOWER 70S FOR THE 18TH AND 19TH OF THE MONTH BEFORE A COLD
FRONT WITH STRONG TO SEVERE THUNDERSTORMS WHIPPED ACROSS WESTERN NEW
YORK. THE STRONGEST CLUSTER OF STORMS ADVANCED FROM THE LAKE ERIE
SHORELINE OF CHAUTAUQUA COUNTY INLAND ACROSS CENTRAL ERIE, GENESEE
AND TO MONROE COUNTY DOWNING SEVERAL TREES AND POWER LINES. COOLER,
AND DRIER AIR BEHIND THE FRONT LEFT EASTER SUNDAY SUNNY, ALBEIT
CHILLY. ANOTHER SURFACE LOW BROUGHT A FEW HEAVIER THUNDERSTORMS TO
THE WESTERN SOUTHERN TIER ON MONDAY APRIL 21ST. MILDER TEMPERATURES
THE FINAL WEEK OF THE MONTH BROUGHT THE AVERAGE TEMPERATURE FOR THE
MONTH TO THE POSITIVE SIDE. AHEAD OF A STRONG COLD FRONT ON THE 29TH
ADDITIONAL THUNDERSTORMS BLOSSOMED IN THE MID AFTERNOON AND EARLY
EVENING HOURS ALONG A SOUTHERN LAKE ERIE LAKE BREEZE, WITH NUMEROUS
TREES DOWN, AND LARGE HAIL TO GOLF BALL SIZE OCCURRING FROM THE
SOUTHERN TIER ACROSS WYOMING COUNTY AND INTO NORTHERN PORTIONS OF
LIVINGSTON AND ONTARIO COUNTIES. ADDITIONAL SEVERE THUNDERSTORMS
OCCURRED ALONG THE NORTHEASTERN MONROE COUNTY SHORELINE, WITH
SEVERAL TREES DOWN IN IRONDEQUOIT AND WEBSTER. FOR THE FINAL DAY OF
THE MONTH TEMPERATURES WERE ABOUT 25 TO 30 DEGREES COLDER THAN THE
PREVIOUS DAY, THOUGH SUNSHINE WAS ABUNDANT THROUGHOUT THE DAY.
THE WATER TEMPERATURE ON LAKE ONTARIO REMAINED BETWEEN 39°F AND
44°F. THE WINDS AVERAGED ABOVE NORMAL FOR THE MONTH, AND THE
STRONGEST GUST OCCURRED ON THE 29TH AHEAD OF A COLD FRONT WITH A
SPEED OF 56 MPH FROM THE WEST.
IN ALL A TYPICAL APRIL WITH FLUCTUATING TEMPERATURES, THOUGH LACKING
MUCH END OF THE SEASON SNOW.
THOMAS
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