BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, SEPTEMBER 30, 2006 ALL TIMES ARE IN EASTERN STANDARD TIME MOSTLY SUNNY, COOLER AND DRIER TODAY... The low temperature this morning of 42 deg F was the lowest of the season to date and 6 deg F below the normal for the date. The dew point dropped as low as the mid-30s early this morning. The month will average slightly warmer than normal, and precipitation is much below average. Visibility has been very high today from 75 to 80 miles. Today's observations: 7 A.M. Weather: Clear, few cirrus and altocumulus Temperature: 46F, Dew point: 38F, Wind: W at 8 kts Sea-level pressure: 30.18 inches Hg, rising Visibility: 80 miles 6-hourly min. temp. 42 deg. 24-hourly precip. 0.13 in. BHO SA 1155 CLR 80 220/46/38/2708/018/ FEW CI FEW AC SW THN K LYR ALG HRZN N-ENE WND LGT/ 8/001 53024 70013 10046 20042 10 A.M. Weather: Scattered cirrus Temperature: 56F, Dew point: 38F, Wind: WNW at 3 kts, variable Sea-level pressure: 30.22 inches Hg, rising Visibility: 75 miles BHO SA 1455 200 SCT 75 234/56/38/2903/022/ FEW ACSL SW-WNW FEW CU DSNT NW WND LGT AND VRB/ 8/141 51014 1 P.M. Weather: Scattered cumulus, thin broken cirrus Temperature: 61F, Dew point: 40F, Wind: SSE at 11 kts Sea-level pressure: 30.21 inches Hg, falling Visibility: 75 miles BHO SA 1755 35 SCT 250 –BKN 75 231/61/40/1611/021/ 8/201 58003 10062 20046 WEATHER SUMMARY FOR FRIDAY, SEPTEMBER 29 TEMPERATURE (DEGREES F) MAX.....65 NORMAL.....66 MIN.....45 NORMAL.....49 MEAN....55 NORMAL.....58 DEPARTURE FROM 30-YEAR NORMAL........-3 TOTAL DEPARTURE FOR THE MONTH.......+17 (+0.4 DEGREE/DAY) PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.........41 S AT 12:47 P.M. AEROVANE..........42 S AT 12:45 P.M. ASOS..............38 S AT 12:46 P.M. DAVIS.............41 S AT 1:14 P.M. FASTEST MILE FOR YESTERDAY...........30 S AT 12:45 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE........31 S AT 12:47 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.......32 S AT 1:15 P.M. AVERAGE WIND SPEED AND DIRECTION....14.8 W ASOS.............14.6 DAVIS............N/A PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.13 DEPARTURE.....-0.01 ASOS..............0.15 TOTAL PRECIPITATION FOR THE MONTH..........2.58 DEPARTURE.....-1.41 ASOS..............2.57 TOTAL PRECIPITATION FOR THE YEAR..........46.14 DEPARTURE.....+8.68 ASOS.............45.69 PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 2006......CALENDAR DAY DATA DATA REPORTED: DATE MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available 9/1 68/57/63/-4/0/442/56 29 ENE 9/2 63/58/61/-5/T/000/00 45 ENE Aero 42 MPH ENE TD ERNESTO 9/3 68/58/63/-3/0.44/000/00 39 E Aero 37 MPH E 9/4 73/56/65/-1/0/519/66 31 WSW Aero 30 MPH WSW 9/5 71/56/64/-1/0.11/168/22 18 W 9/6 73/59/66/+1/0/194/25 17 WSW 9/7 73/58/66/+1/0/723/94 17 S 9/8 78/59/69/+4/0/631/82 22 SW 9/9 82/61/72/+8/T/682/89 24 SSW 9/10 65/51/58/-6/0/497/65 27 NE 9/11 63/47/55/-9/0/731/96 32 NE 9/12 64/45/55/-8/0/735/97 28 NNE 9/13 64/48/56/-7/T/119/16 23 SSE 9/14 70/56/63/0/0.30/0/0 24 SSE 9/15 69/59/64/+2/T/210/28 23 NE 9/16 76/57/67/+5/0/583/78 18 N 9/17 79/58/69/+7/0/662/89 17 SE 9/18 80/59/70/+9/0/579/78 24 S 9/19 79/61/70/+9/0.77/525/71 30 S 9/20 70/53/62/+1/0.13/523/71 28 WSW Aero 30 MPH WNW 9/21 63/48/56/-4/0/711/97 30 WNW 9/22 68/47/58/-2/0/614/84 23 S 9/23 68/56/62/+2/T/000/00 42 S 9/24 79/61/70/+11/0.02/087/.12 43 SSW Aero 43 MPH SSW 9/25 67/52/60/+1/0/310/43 28 W 9/26 69/51/60/+1/0/689/96 29 WSW 9/27 71/50/61/+3/0/.../.. 23 SSW 9/28 71/54/63/+5/0/.../.. 22 SE 9/29 65/45/55/-3/0.81/.../.. 41 S Aero 42 MPH S 9/30 morning low temp. 42 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR SEPTEMBER 30 HIGH 84F IN 1986 LOW 31F IN 1992 PRECIP 1.93 INCHES IN 1946 PEAK GUST 58 MPH SSE IN 1999 RECORDS FOR OCTOBER 1 HIGH 85F IN 1927 LOW 30F IN 1992 PRECIP 1.44 INCHES IN 1984 PEAK GUST 68e MPH SSE IN 1977 TODAY'S REPORT BY: Mike Iacono