BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, JUNE 5, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Overcast cirrostratus, line of stratocumulus distant E-S, sun dimly visible Temperature: 58F, Dew point: 54F, Wind: SE at 4 kts, Wind: Gradually backing past hour Sea-level pressure: 30.02 inches Hg, rising Visibility: 20 miles, thin fog/haze 6-hour minimum temp: 55F BHO SA 1155 E220 OVC 20 167/58/54/1304/002/ LINE SC DSNT E-S THN F/H SUN DMLY VSBL WND GRDLY BACKING PST HR INVSN PRSNT/ 8/507 51009 10058 20055 10 A.M. Weather: Scattered stratocumulus, overcast cirrostratus, few lower stratus Temperature: 63F, Dew point: 54F, Wind: SE at 6 kts, Wind: Light and variable Sea-level pressure: 30.03 inches Hg, rising Visibility: 25 miles, hazy BHO SA 1455 35 SCT E200 OVC 25 170/63/54/1306/003/ FEW LWR STRA HZY WND L/V/ 8/507 53007 WEATHER SUMMARY FOR THURSDAY, JUNE 4 TEMPERATURE (DEGREES F) MAX.....73 NORMAL.....73 MIN.....53 NORMAL.....53 MEAN....63 NORMAL.....63 DEPARTURE FROM 30-YEAR NORMAL............0 TOTAL DEPARTURE FOR THE MONTH...........-4 [-1.2 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............2 DEPARTURE.......-2 TOTAL HEATING UNITS FOR THE MONTH............15 DEPARTURE.......-3 TOTAL HEATING UNITS FOR THE SEASON.........6136 DEPARTURE.....-179 TOTAL HEATING UNITS LAST SEASON TO DATE....5906 DIFFERENCE....+230 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............22 SSE AT 7:51 P.M. AEROVANE..............20 SSE AT 7:51 P.M. ASOS..................20 S AT 7:51 P.M. DAVIS.................19 S AT 7:09 P.M. FASTEST MILE FOR YESTERDAY...............15 SSE AT 7:52 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE............16 S AT 7:52 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........14 S AT 7:10 P.M. AVERAGE WIND SPEED AND DIRECTION.........8.2 SSW ASOS..................8.3 DAVIS.................7.7 SSW [198 DEG] * last of several occurrences PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE....-0.13 ASOS..............0.00 TOTAL PRECIPITATION FOR JUNE..............0.00 DEPARTURE....-0.52 ASOS..............0.00 TOTAL PRECIPITATION FOR THE YEAR..........18.50 DEPARTURE....-3.76 ASOS.............19.55 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 our morning low temp: 55F, 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 5 HIGH 95F IN 1930 LOW 41F IN 1891 PRECIP 2.83 INS IN 1982 PEAK GUST 57 MPH NNW IN 1988 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 TODAY'S REPORT PREPARED BY: Stephanie Radner