BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, JUNE 20, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME PARTIAL SUNSHINE TODAY WITH MODERATE HUMIDITY AND LIGHT WINDS...MORE RAIN EXPECTED LATER TODAY... A total of 0.91 inch of rainfall occurred from Thursday afternoon to mid-day on Friday, which brings the monthly total over two inches. This is below the average for June to date, though nine of the first 19 days in June have brought measurable rainfall. Partial sunshine early this morning has given way to a mostly cloudy sky early this afternoon. Winds have been very light today, and only three miles of wind were measured in the four hours from 6-10 AM EDT today. The dew point peaked in the middle 60s early today, and is has been in the low 60s since sunrise. Today's observations: 7 A.M. Weather: Scattered stratocumulus and thin overcast cirrus, few stratus fractus, fog bank offshore NE-E Temperature: 64F, Dew point: 62F, Wind: Calm Sea-level pressure: 29.72 inches Hg, steady Visibility: 20 miles 6-hour minimum temp: 60F 24-hour rainfall: 0.15 inches BHO SA 1155 5 SCT 250 –OVC 20 066/64/62/0000/972/ FEW STFRA FG BNK OFFSHR NE-E/ 8/501 55000 70015 10064 20060 10 A.M. Weather: Broken stratocumulus, broken dense cirrus, overcast cirrus, sun dimly visible, hazy Temperature: 70F, Dew point: 62F, Wind: S at 3 kt Sea-level pressure: 29.72 inches Hg, falling Visibility: 50 miles BHO SA 1455 20 SCT E35 BKN 200 BKN 250 OVC 50 065/70/62/ 1803/972/ SUN DMLY VSBL HAZY WND LGT AND VRB/ 8/501 58001 1 P.M. Weather: Broken stratocumulus, broken altocumulus, overcast cirrus, few moderate cumulus, hazy Temperature: 74F, Dew point: 63F, Wind: SSW at 5 kts Sea-level pressure: 29.65 inches Hg, falling Visibility: 50 miles 6-hour max. temp: 75F BHO SA 1755 E35 BKN 180 BKN 250 OVC 50 039/74/63/2005/965/ FEW MDT CU HAZY WND LGT AND VRB/ 8/531 56026 10075 20064 WEATHER SUMMARY FOR FRIDAY, JUNE 19 TEMPERATURE (DEGREES F) MAX.....70 NORMAL.....76 MIN.....61 NORMAL.....57 MEAN....66 NORMAL.....67 DEPARTURE FROM 30-YEAR NORMAL...........-1 TOTAL DEPARTURE FOR THE MONTH..........-69 [-3.8 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............0 DEPARTURE.......-2 TOTAL HEATING UNITS FOR THE MONTH............88 DEPARTURE......+28 TOTAL HEATING UNITS FOR THE SEASON.........6209 DEPARTURE.....-148 TOTAL HEATING UNITS LAST SEASON TO DATE....5942 DIFFERENCE....+267 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............33 SE AT 12:10 A.M. AEROVANE..............31 SE AT 12:10 A.M. ASOS..................29 SSE AT 12:01 A.M. DAVIS.................30 ESE AT N/A FASTEST MILE FOR YESTERDAY...............23 SE AT 12:02 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE............22 SSE AT 12:02 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........24 SE AT 12:02 A.M. AVERAGE WIND SPEED AND DIRECTION.......11.4 SE ASOS.................9.6 DAVIS...............10.7 SE [132 DEG] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.15 DEPARTURE....+0.02 ASOS..............0.16 TOTAL PRECIPITATION FOR JUNE..............2.07 DEPARTURE....-0.43 ASOS..............2.08 TOTAL PRECIPITATION FOR THE YEAR..........20.57 DEPARTURE....-3.67 ASOS.............21.63 PRELIMINARY CLIMATE SUMMARY FOR JUNE 2009 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 6/1 69/41/55/-7/0/706/78 29 SSW AERO 25 MPH SSW 6/2 76/53/65/+3/T/525/58 28 S AERO 24 MPH S 6/3 69/54/62/0/T/254/28 23 SSW 6/4 73/53/63/0/0/327/36 22 SSE 6/5 64/51/58/-5/0.05/000/00 21 NE 6/6 73/51/62/-1/0.01/428/47 25 SSE 6/7 79/56/68/+4/0/583/64 28 W AERO 24 MPH W 6/8 73/57/65/+1/0/529/58 18 ENE 6/9 59/51/55/-9/0.10/000/00 27 E 6/10 59/52/56/-8/0.00/000/00 21 NE 6/11 57/52/55/-10/0.17/000/00 23 NNE AERO 21 MPH NE 6/12 70/53/62/-3/0.43/119/13 30 SSE AERO 29 MPH SSE 6/13 75/59/67/+2/T/796/87 23 NNE 6/14 63/54/59/-6/0.34/101/11 20 E 6/15 60/52/56/-10/0.06/027/03 20 NE 6/16 64/51/58/-8/T/.../.. 22 NNE 6/17 74/50/62/-4/0/.../.. 28 S AERO 24 MPH S 6/18 65/52/59/-7/.../.../.. 35 ESE 6/19 70/61/66/-1/.../.../.. 33 SE AERO 31 MPH SE 6/20 ..overnight low temperature 60...normal low is now 57 NEW DAILY RECORDS FOR JUNE 2009 TO DATE... None DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JUNE 20 HIGH 94F IN 1953 LOW 41F IN 1918 PRECIP 2.62 INS 1945 PEAK GUST 63 MPH NE IN 1967 RECORDS FOR JUNE 21 HIGH 92F IN 1949 LOW 42F IN 1940 PRECIP 1.40 INS 1903 PEAK GUST 51 MPH SSW IN 2000 TODAY'S REPORT PREPARED BY: Mike Iacono