BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, JUNE 12, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Sky obscured with fog Temperature: 63F, Dew point: 63F, Wind: SSE at 17G26 kts Wind: Peak gust 26 kts SSE at 6:48 A.M. Sea-level pressure: 29.71 inches Hg, falling Visibility: 1/16 mile, fog 6-hour minimum temp: 53F 24-hour rainfall: 0.55 in. BHO SA 1155 W2 X 1/16F 060/63/63/1517G26/971/ PK WND 1526/48/ 8//// 58021 MANUAL 60XX/ ASOS 60036 MANUAL 70055 ASOS 70056 10063 20054 10 A.M. Weather: Scattered stratus fractus, overcast stratus, fog, light drizzle Temperature: 67F, Dew point: 66F, Wind: SSW at 14 kts Sea-level pressure: 29.72 inches Hg, rising Visibility: 3 miles, fog 3-hour precip: trace BHO SA 1455 3 SCT E8 OVC 3L-F 063/67/66/2014/972/ 8/6// 53003 MANUAL 6000/ 1 P.M. Weather: Overcast stratus Temperature: 70F, Dew point: 66F, Wind: WSW at 10 kts Sea-level pressure: 29.74 inches Hg, rising Visibility: 20 miles, hazy 6-hour precip: trace 6-hourly max. temp: 70F BHO SA 1755 E45 OVC 20 071/70/66/2410/974/ CIG RGD BRGHT SPTS IOVC NW-N-NE HAZY/ 8/6// 52008 MANUAL 6000/ 10070 20063 WEATHER SUMMARY FOR THURSDAY, JUNE 11 TEMPERATURE (DEGREES F) MAX.....57 NORMAL.....74 MIN.....52 NORMAL.....55 MEAN....55 NORMAL.....65 DEPARTURE FROM 30-YEAR NORMAL..........-10 TOTAL DEPARTURE FOR THE MONTH..........-32 [-3.1 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............10 DEPARTURE.......+7 TOTAL HEATING UNITS FOR THE MONTH............54 DEPARTURE......+12 TOTAL HEATING UNITS FOR THE SEASON.........6175 DEPARTURE.....-164 TOTAL HEATING UNITS LAST SEASON TO DATE....5928 DIFFERENCE....+247 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............23 NNE AT 7:42 A.M. AEROVANE..............21 NE AT 7:40 A.M. ASOS..................21 NE AT 7:42 A.M. DAVIS.................20 NE AT 7:24 A.M. FASTEST MILE FOR YESTERDAY...............14 ENE AT 7:25 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE............15 ENE AT 7:42 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........15 NNE AT 7:42 A.M. AVERAGE WIND SPEED AND DIRECTION........6.8 NNE ASOS.................6.5 DAVIS................6.9 NE [042 DEG] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.55 DEPARTURE....+0.42 ASOS..............0.56 TOTAL PRECIPITATION FOR JUNE..............0.71 DEPARTURE....-0.72 ASOS..............0.70 TOTAL PRECIPITATION FOR THE YEAR..........19.21 DEPARTURE....-3.96 ASOS.............20.25 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 57/52/55/-10/.../000/00 23 NNE AERO 21 MPH NE 6/12 our morning low temp: 53F; 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 12 HIGH 92F IN 1973 LOW 40F IN 1906 PRECIP 1.79 INS 1955 PEAK GUST 58 MPH NW IN 1991 RECORDS FOR JUNE 13 HIGH 93F IN 1988 LOW 43F IN 1982 PRECIP 6.07 INS 1998 [Record for month] PEAK GUST 69 MPH N IN 1956 TODAY'S REPORT PREPARED BY: Stephanie Radner