BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, JUNE 6, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME LIGHT SHOWERS OVERNIGHT GIVING WAY TO PARTIAL SUNSHINE THIS AFTERNOON... A period of light rain Friday afternooon and several light showers overnight brought a total of 0.06 inch of precipitation, with a trace occurring after midnight. Low clouds and thin fog early this morning have been slow to burn away, but they have turned to partial sunshine at mid-day. The temperature has climbed from a low of 51 to the upper 60s as of 2 PM EDT. Today's observations: 7 A.M. Weather: Overcast stratus Temperature: 53F, Dew point: 53F, Wind: NNW at 5 kts Sea-level pressure: 29.93 inches Hg, rising Visibility: 5 miles, variable 3-7 miles 6-hour minimum temp: 52F 6-hour precipitation: Trace 24-hour precipitation: 0.06 inch BHO SA 1155 E5 OVC 5VF 136/53/52/3405/993/ VSBY 3V7 WND LGT/ 8/6// 51017 6000/ 70006 10053 20052 10 A.M. Weather: Overcast stratocumulus Temperature: 58F, Dew point: 53F, Wind: N at 3 kts Wind: Light and variable Sea-level pressure: 29.96 inches Hg, rising Visibility: 20 miles, visibility N-E 12 miles, hazy BHO SA 1455 E9 OVC 20 145/58/53/3503/996/ SUN DMLY VSBL VSBY N-E 12 HAZY WND LGT AND VRB/ 8/5// 50009 1 P.M. Weather: Scattered cumulus, thin broken cirrus Temperature: 67F, Dew point: 54F, Wind: SW at 5 kts Wind: Light and variable Sea-level pressure: 29.94 inches Hg, falling Visibility: 40 miles, visibility NE-E 15, hazy BHO SA 1755 E20 SCT 200 –BKN 40 140/67/54/2305/994/ FEW CUFRA VSBY NE-E 15 HAZY WND LGT AND VRB/ 8/101 55005 10067 20053 WEATHER SUMMARY FOR FRIDAY, JUNE 5 TEMPERATURE (DEGREES F) MAX.....64 NORMAL.....73 MIN.....51 NORMAL.....53 MEAN....58 NORMAL.....63 DEPARTURE FROM 30-YEAR NORMAL...........-5 TOTAL DEPARTURE FOR THE MONTH...........-9 [-2.0 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............7 DEPARTURE.......+3 TOTAL HEATING UNITS FOR THE MONTH............22 DEPARTURE........0 TOTAL HEATING UNITS FOR THE SEASON.........6143 DEPARTURE.....-176 TOTAL HEATING UNITS LAST SEASON TO DATE....5918 DIFFERENCE....+225 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............21 NE AT 8:45 P.M. * AEROVANE..............18 NE AT 8:50 P.M. ASOS..................20 ENE AT 8:50 P.M. DAVIS.................19 NE AT 6:32 P.M. FASTEST MILE FOR YESTERDAY...............15 NE AT 8:44 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE............15 ENE AT 8:46 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........15 NE AT 8:45 P.M. AVERAGE WIND SPEED AND DIRECTION........8.4 ESE ASOS.................7.5 DAVIS................7.4 ESE [106 DEG] * Last of several occurrences PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.06 DEPARTURE....-0.07 ASOS..............0.05 TOTAL PRECIPITATION FOR JUNE..............0.06 DEPARTURE....-0.59 ASOS..............0.05 TOTAL PRECIPITATION FOR THE YEAR..........18.56 DEPARTURE....-3.83 ASOS.............19.60 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 recording wind 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 6/2 76/53/65/+3/T/525/58 28 S 6/3 69/54/62/0/T/254/28 23 SSW AERO 20 MPH SSW 6/4 73/53/63/0/0/.../.. 22 SSE AERO 20 MPH SSE 6/5 64/51/58/-5/0.06/.../.. 21 NE 6/6 our morning low temp: 51F, the normal low is 53F 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 6 HIGH 95F IN 1925 LOW 42F IN 1885, 1894, 1920, 1945 PRECIP 3.61 INS IN 2000 PEAK GUST 58 MPH NE IN 2000 RECORDS FOR JUNE 7 HIGH 93F IN 1999 LOW 40F IN 1932 PRECIP 4.01 INS IN 2006 PEAK GUST 58 MPH NE IN 1982 TODAY'S REPORT PREPARED BY: Mike Iacono