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Climatological Report (Monthly)
Issued by NWS Medford, OR
Issued by NWS Medford, OR
000 CXUS56 KMFR 021146 CLMMFR CLIMATE REPORT NATIONAL WEATHER SERVICE MEDFORD, OR 545 AM PDT FRI JUN 02 2023 ................................... ...THE MEDFORD OR CLIMATE SUMMARY FOR THE MONTH OF MAY 2023... CLIMATE NORMAL PERIOD 1991 TO 2020 CLIMATE RECORD PERIOD 1911 TO 2023 WEATHER OBSERVED NORMAL DEPART LAST YEAR`S VALUE DATE(S) VALUE FROM VALUE DATE(S) NORMAL ................................................................ TEMPERATURE (F) RECORD HIGH 103 05/30/1986 LOW 28 05/04/1996 05/06/1968 05/01/1954 HIGHEST 93 05/14 88 05/25 LOWEST 38 05/07 34 05/20 AVG. MAXIMUM 78.0 73.9 4.1 69.7 AVG. MINIMUM 50.4 46.9 3.5 45.0 MEAN 64.2 60.4 3.8 57.4 DAYS MAX >= 90 6 2.7 3.3 0 DAYS MAX <= 32 0 0.0 0.0 0 DAYS MIN <= 32 0 0.3 -0.3 0 DAYS MIN <= 0 0 0.0 0.0 0 PRECIPITATION (INCHES) RECORD MAXIMUM 4.58 1945 TOTALS 1.03 1.34 -0.31 0.82 DAILY AVG. 0.03 0.04 -0.01 0.03 DAYS >= .01 6 8.7 -2.7 10 DAYS >= .10 2 4.0 -2.0 5 DAYS >= .50 1 0.5 0.5 0 DAYS >= 1.00 0 0.0 0.0 0 GREATEST 24 HR. TOTAL 0.50 05/08 TO 05/08 SNOWFALL (INCHES) RECORDS TOTAL 0.1 1988 TOTALS 0.0 0.0 0.0 T SINCE 7/1 4.7 3.4 1.3 MM DEGREE DAYS HEATING TOTAL 122 179 -57 241 SINCE 7/1 4231 4151 80 MM COOLING TOTAL 103 37 66 10 SINCE 1/1 120 40 80 MM FREEZE DATES RECORD EARLIEST 09/13/1921 LATEST 06/12/1952 EARLIEST 11/10 LATEST 04/15 ................................................................ WIND (MPH) AVERAGE WIND SPEED 4.9 HIGHEST WIND SPEED/DIRECTION 22/350 DATE 05/21 HIGHEST GUST SPEED/DIRECTION 30/230 DATE 05/10 SKY COVER POSSIBLE SUNSHINE (PERCENT) MM AVERAGE SKY COVER 0.29 NUMBER OF DAYS FAIR 21 NUMBER OF DAYS PC 5 NUMBER OF DAYS CLOUDY 5 AVERAGE RH (PERCENT) 55 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 2 MIXED PRECIP 0 HEAVY RAIN 2 RAIN 2 LIGHT RAIN 6 FREEZING RAIN 0 LT FREEZING RAIN 0 HAIL 0 HEAVY SNOW 0 SNOW 0 LIGHT SNOW 0 SLEET 0 FOG 2 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. && THE COOLING TREND FROM THE END OF APRIL CARRIED INTO THE BEGINNING OF MAY WHEN AVERAGE TEMPERATURES HOVERED AROUND 5 TO 10 DEGREES BELOW NORMAL THROUGH THE FIRST 10 DAYS OF THE MONTH. THIS WAS DUE TO YET ANOTHER UPPER LEVEL TROUGH THAT DROPPED SOUTHWARD INTO THE REGION THAT LINGERED THROUGH THE 5TH, FOLLOWED QUICKLY BY A PERIOD OF BROAD TROUGHING OVER THE PACIFIC NORTHWEST THAT PERSISTED THROUGH THE 10TH. DURING THIS TIME, SHOWERS AND THUNDERSTORMS WERE A COMMON OCCURRENCE AND THE MEDFORD AIRPORT RECORDED THE VAST MAJORITY OF IT`S MONTHLY PRECIPITATION DURING THE FIRST 8 DAYS OF THE MONTH. CONDITIONS TRANSITIONED TO A MORE SUMMER LIKE PATTERN FOR THE REMAINDER OF THE MONTH WITH DAILY THUNDERSTORMS AND WARMER TEMPERATURES. AROUND THE 11TH, THE FLOW QUICKLY TRANSITIONED FROM ZONAL TO AN AMPLIFIED UPPER LEVEL RIDGE BY THE 14TH. THIS BROUGHT A SHARP WARM UP WITH HIGH TEMPERATURES MORE TYPICAL OF SUMMER VALUES THAN MID-MAY. LOW PRESSURE RETROGRADED AND UNDERCUT THE AMPLIFIED RIDGE, LEADING TO A REX BLOCK PATTERN. THIS LIMITED THE INLAND HEAT, BUT THE ORIENTATION OF THE UPPER LEVEL PATTERN BROUGHT THE WARMEST TEMPERATURES TO THE COAST AND INTO THE UMPQUA BASIN. TEMPERATURES PEAKED ON THE 14TH AND ALTHOUGH MEDFORD ONLY RECORDED 93 DEGREES THAT DAY, BOTH NORTH BEND AND ROSEBURG RECORDED 95 DEGREES. THIS WAS A NEW DAILY RECORD FOR NORTH BEND BUT ROSEBURG FELL SHORT OF THEIR DAILY RECORD BY TWO DEGREES. DESPITE LOW PRESSURE IN THE REGION, TEMPERATURES REMAINED HOT FOR MUCH OF THE AREA AND SEVERAL DAYS OF LOW 90S WERE RECORDED AT THE MEDFORD AIRPORT THROUGH THE 19TH. THE REGION REMAINED UNDER THE INFLUENCE OF THE UPPER LOW THROUGH THE 16TH, THEN HIGH PRESSURE RETURNED AROUND THE 17TH AND DOMINATED THE LOCAL WEATHER THROUGH THE 21ST. THIS MAINTAINED BENIGN WEATHER WITH HOT TEMPERATURES AND DRY CONDITIONS. THE PATTERN TRANSITIONED AGAIN AROUND THE 22ND AS A TROUGH PASSED NORTH OF THE AREA AND BROUGHT A DRY COLD FRONT THROUGH THE REGION. BROAD TROUGHING SETTLED OVER THE PACIFIC NORTHWEST AFTER THIS FRONT AND PERSISTED THROUGH THE END OF THE MONTH. THIS BROUGHT AVERAGE TEMPERATURES CLOSER BACK TO SEASONAL NORMS, THOUGH TEMPERATURES WERE STILL AROUND FIVE DEGREES ABOVE NORMAL. THE MORE NOTICEABLE CHANGE WAS THE RETURN TO A DAILY THUNDERSTORM PATTERN, ESPECIALLY EAST OF THE CASCADES AND ACROSS NORTHERN CALIFORNIA. THE MEDFORD AREA WAS ON THE WESTERN PERIPHERY OF THUNDERSTORMS, SO ONLY A TRACE OF PRECIPITATION WAS RECORDED ON THE 28TH AS A THUNDERSTORM GRAZED BY THE AIRPORT. EAST OF THE CASCADES AND ACROSS NORTHERN CALIFORNIA, HOWEVER, SLOW MOVING STORMS BROUGHT UPWARDS OF HALF TO THREE QUARTERS OF AN INCH OF RAIN AND THE CLIMATE SITES IN THOSE AREAS RECORDED ABOVE NORMAL PRECIPITATION FOR THE MONTH. $$