BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, MAY 22, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME TEMPERATURES REACH UPPER 80'S EARLY AFTERNOON FOR THE SECOND DAY IN A ROW Today's high temerature has reached 87F by 2 P.M. EDT, which is still 6 degrees lower than the record for today's date of 93F in 1911. Yesterday's high temperature of 89F also fell short of the record for the date of 92F which occurred in 1921. Today's observations: 7 A.M. Weather: Clear, few cirrus NW-NE, hazy Temperature: 66F, Dew point: 45F, Wind: SSW at 12 kts Sea-level pressure: 30.11 inches Hg, rising Visibility: 25 miles, west-northwest 35 miles 6-hour minimum temp: 59F 24-hour precipitation: 0.00 inch BHO SA 1155 CLR 25 195/66/45/2112/011/ FEW CI NW-NE HAZY VSBY WNW 35/ 8/001 51009 10066 20059 10 A.M. Weather: Clear, few cirrus W-N-NE, hazy Temperature: 80F, Dew point: 50F, Wind: WSW at 8 kts, Wind: direction variable S to WNW Sea-level pressure: 30.09 inches Hg, falling Visibility: 25 miles BHO SA 1455 CLR 25 188/80/50/2408/009/ FEW CI W-N-NE HAZY WND 19V29/ 8/001 58007 1 P.M. Weather: Broken cirrus, hazy Temperature: 85F, Dew point: 46F, Wind: WSW at 12G23 kts, Wind: Direction variable S to WNW Sea-level pressure: 30.03 inches Hg, falling Visibility: 25 miles 6-hour maximum temp: 87F BHO SA 1755 E250 BKN 25 171/85/46/2412G23/003/ HAZY WND 19V30/ 8/001 56017 10087 20066 WEATHER SUMMARY FOR THURSDAY, MAY 21 TEMPERATURE (DEGREES F) MAX.....89 NORMAL.....69 MIN.....59 NORMAL.....49 MEAN....74 NORMAL.....59 DEPARTURE FROM 30-YEAR NORMAL..........+15 TOTAL DEPARTURE FOR THE MONTH..........+55 [+2.4 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............ 0 DEPARTURE.......-7 TOTAL HEATING UNITS FOR THE MONTH...........157 DEPARTURE......-55 TOTAL HEATING UNITS FOR THE SEASON.........6053 DEPARTURE.....-185 TOTAL HEATING UNITS LAST SEASON TO DATE....5856 DIFFERENCE....+197 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............37 S AT 3:08 P.M. AEROVANE.............34 S AT 3:08 P.M. ASOS.................37 SSW AT 3:08 P.M. DAVIS................40 SSW AT 3:52 P.M. FASTEST MILE FOR YESTERDAY..............28 SSW AT 4:12 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........28 SSW AT 6:06 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........29 SSW AT 4:03 P.M. AVERAGE WIND SPEED AND DIRECTION.......17.9 SSW ASOS................17.3 DAVIS...............18.1 SSW [213 DEG] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE....-0.12 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........2.38 DEPARTURE....-0.19 ASOS..............2.37 TOTAL PRECIPITATION FOR THE YEAR..........16.99 DEPARTURE....-3.53 ASOS.............18.05 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE..... 0.0 TOTAL SNOWFALL FOR THE MONTH................0.0 DEPARTURE.....-0.1 TOTAL SNOWFALL FOR THE SEASON..............78.9 DEPARTURE.....18.8 PRELIMINARY CLIMATE SUMMARY FOR MAY 2009 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system gust when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 5/1 64/53/59/+7/T/000/00 37 SSW AERO 37 MPH SSW 5/2 68/52/60/+8/0.05/263/31 32 WNW 5/3 64/48/56/+3/T/068/08 25 S 5/4 64/48/56/+3/0.01/009/01 17 SSW 5/5 52/44/48/-5/0.95/000/00 43 NNE AERO 40 MPH NNE 5/6 63/43/53/-1/0.40/189/22 24 SSE 5/7 68/49/59/+5/0.60/009/01 29 S 5/8 75/52/64/+10/0/690/80 28 S 5/9 71/55/63/+8/0.14/104/12 31 W TSTM 5/10 65/46/56/+1/0/840/97 53 W Aero 50 MPH W 5/11 63/41/52/-3/0/781/90 24 WNW 5/12 63/45/54/-2/0/696/80 22 ENE 5/13 70/45/58/+2/0/732/84 31 SSE AERO 29 MPH SSE 5/14 62/47/55/-2/0.10/166/19 53 S AERO 52 MPH S 5/15 76/54/65/+8/0/474/54 38 S AERO 38 MPH S 5/16 68/54/61/+4/T/457/52 35 S AERO 35 MPH S 5/17 61/49/55/-2/0.09/009/01 35 WNW AERO 33 MPH WNW 5/18 53/42/48/-10/0.04/168/19 27 NE 5/19 70/42/56/-2/0/813/92 28 S 5/20 82/49/66/+8/0/771/87 31 SSW 5/21 89/59/74/+15/0/870/98 37 S AERO 34 MPH S 5/22 our morning low temp: 59F; the normal low is now 49F NEW DAILY RECORDS FOR MAY 2009... 5/14: RECORD PEAK WIND GUST 53 MPH S; surpasses previous record of 50 MPH SW in 1976 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR MAY 22 HIGH 93F IN 1911 LOW 35F IN 1907 PRECIP 3.75 INCHES IN 1920 PEAK GUST 49e MPH SSW IN 1947 RECORDS FOR MAY 23 HIGH 92F IN 1964,1992 LOW 38F IN 1976 PRECIP 0.97 INS IN 1979 PEAK GUST 49e MPH W IN 1945 TODAY'S REPORT PREPARED BY: Stephanie Radner