BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, JUNE 11, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Scattered cumulus, overcast stratus Temperature: 55F, Dew point: 50F, Wind: NE at 8 kts Sea-level pressure: 30.02 inches Hg, rising Visibility: 8 miles, thin fog/haze 6-hour minimum temp: 54F 6-hour rainfall: trace 24-hour rainfall: trace BHO SA 1155 8 SCT E16 OVC 8 166/55/50/0408/002/ THN F/H/ 8/8// 50002 MANUAL 6000/ 10054 20052 10 A.M. Weather: Low overcast stratus Temperature: 55F, Dew point: 52F, Wind: ENE at 8 kts Sea-level pressure: 30.01 inches Hg, falling Visibility: 10 miles, thin fog 3-hour precip: trace BHO SA 1455 E10 OVC 10 161/55/52/0708/001/ THN FG/ 8/6/// 55005 MANUAL 6000/ 1 P.M. Weather: Low overcast stratus Temperature: 56F, Dew point: 53F, Wind: ENE at 10 kts, Wind: Direction variable N to E Sea-level pressure: 29.98 inches Hg, falling Visibility: 10 miles, thin fog 6-hour precip: trace 6-hourly max. temp: 57F BHO SA 1755 E10 OVC 10 153/56/53/0610/998/ WND 01V09/ 8/6// 58008 MANUAL 6000/ 10057 20053 WEATHER SUMMARY FOR WEDNESDAY, JUNE 10 TEMPERATURE (DEGREES F) MAX.....59 NORMAL.....74 MIN.....52 NORMAL.....54 MEAN....56 NORMAL.....64 DEPARTURE FROM 30-YEAR NORMAL...........-8 TOTAL DEPARTURE FOR THE MONTH..........-22 [-2.4 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............9 DEPARTURE.......+6 TOTAL HEATING UNITS FOR THE MONTH............44 DEPARTURE.......+5 TOTAL HEATING UNITS FOR THE SEASON.........6165 DEPARTURE.....-171 TOTAL HEATING UNITS LAST SEASON TO DATE....5928 DIFFERENCE....+237 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............21 NE AT 8:29 P.M. AEROVANE..............18 NE AT 8:29 P.M. ASOS..................18 ENE AT 8:29 P.M. DAVIS.................18 NE AT 7:02 P.M. FASTEST MILE FOR YESTERDAY...............12 NE AT 8:31 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE............14 ENE AT 8:30 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........13 NE AT 8:30 P.M. AVERAGE WIND SPEED AND DIRECTION........6.3 NE ASOS.................6.2 DAVIS................6.4 NNE [24 DEG] * last of several occurrences PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...trace DEPARTURE....-0.13 ASOS..............0.00 TOTAL PRECIPITATION FOR JUNE..............0.16 DEPARTURE....-1.14 ASOS..............0.14 TOTAL PRECIPITATION FOR THE YEAR..........18.66 DEPARTURE....-4.38 ASOS.............19.69 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/.../000/00 21 NE AERO 18 MPH NE 6/11 our morning low temp: 52F; the normal low is 55F 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 11 HIGH 92F IN 1973,1984,1997 LOW 40F IN 1972 PRECIP 2.66 INS 1922 PEAK GUST 43e MPH S IN 1945 RECORDS FOR JUNE 12 HIGH 92F IN 1973 LOW 40F IN 1906 PRECIP 1.79 INS 1955 PEAK GUST 58 MPH NW IN 1991 TODAY'S REPORT PREPARED BY: Stephanie Radner