BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, OCTOBER 20, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Scattered stratocumulus, broken altocumulus Temperature: 58F, Dew point: 58F, Wind: SSW at 10 kts Sea-level pressure: 29.68 inches Hg, rising Visibility: 25 miles 6-hour min temp: 58F 24-hour precipitation: 0.79 inch BHO SA 1155 60 SCT E90 BKN 200 OVC 25 050/58/58/2010/968/ HAZY BINOVC W-NW/ 8/531 51030 6010/ 70079 10070 20058 10 A.M. Weather: Scattered cumulus, overcast altocumulus Temperature: 63F, Dew point: 59F, Wind: SSW at 10 kts Sea-level pressure: 29.67 inches Hg, falling Visibility: 30 miles BHO SA 1455 25 SCT E80 BKN 120 OVC 30 047/63/59/2010/967/ HAZY CLRG LINE WSW-N FEW HIR AC DSNT W-NW WND 17V23/ 8/57/ 56003 1 P.M. Weather: Scattered cumulus, broken altocumulus, few cirrus Temperature: 63F, Dew point: 58F, Wind: SSW at 13 kts Sea-level pressure: 29.63 inches Hg, falling Visibility: 30 miles 6-hour max temp: 64F BHO SA 1755 30 SCT 100 BKN 30 033/63/58/2113/963/ HAZY FEW CI W WND 18V24/ 8/571 58014 10064 20058 WEATHER SUMMARY FOR FRIDAY, OCTOBER 19 TEMPERATURE (DEGREES F) MAX.....70 NORMAL.....59 MIN.....63* NORMAL.....42 MEAN....67 NORMAL.....51 DEPARTURE FROM 30-YEAR NORMAL.........+16 TOTAL DEPARTURE FOR THE MONTH........+114 [+5.8 DEGREES/DAY] * Ties record high minimum for date previously set in 1928. PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............47 SSE AT 8:51 P.M. * AEROVANE.............51 SSE AT 9:00 P.M. ASOS.................48 S AT 9:00 P.M. DAVIS................N/A FASTEST MILE FOR YESTERDAY..............34 SSE AT 7:29 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE...........33 S AT 8:26 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........N/A AVERAGE WIND SPEED AND DIRECTION......18.0 SSE ASOS...............17.7 DAVIS...............N/A * Last of several occurrences. PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.79 DEPARTURE.....+0.65 ASOS..............0.79 TOTAL PRECIPITATION FOR THE MONTH..........2.02 DEPARTURE.....-0.64 ASOS..............2.04 TOTAL PRECIPITATION FOR THE YEAR..........34.90 DEPARTURE.....-5.36 ASOS.............34.16 PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 2007...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 10/1 67/49/58/+1/0/592/84 18 S 10/2 72/50/61/+5/0/323/46 20 SSE 10/3 73/61/67/+11/0/077/11 23 SSE 10/4 84/65/75/+19/0/425/61 21 SSW 10/5 86/61/74/+19/0/618/89 21 SSW 10/6 83/62/73/+18/0/526/76 23 WSW 10/7 71/52/61/+7/0.01/110/16 29 NNE 10/8 58/52/55/+1/0.49/000/00 21 S 10/9 59/50/55/+1/0.10/580/85 29 NNW 10/10 57/50/54/0/0.09/000/00 20 ESE 10/11 58/55/57/+4/0.37/000/00 33 ENE TSTM late evening 10/12 62/42/52/-1/0.18/135/20 42 W Aero 43 MPH W 10/13 59/37/48/-4/0/665/99 25 WNW 10/14 59/42/51/-1/0/629/94 32 W 10/15 62/38/50/-2/0/426/64 29 WNW 10/16 61/43/52/+1/0/650/98 25 NW 10/17 68/41/55/+4/0/462/70 20 SW 10/18 75/57/66/+15/0/.../.. 21 S 10/19 70/63/67/+16/.../0/0 47 SSE Aero 51 MPH SSE 10/20 morning low temp. 58F; normal low now 42F NEW DAILY RECORDS FOR OCTOBER 2007: 10/4 - RECORD HIGH TEMPERATURE 84F; PREVIOUS 83F IN 1898 and 1959. - EQUALED RECORD HIGH MINIMUM TEMPERATURE OF 65F; ALSO IN 1927. 10/5 - RECORD HIGH TEMPERATURE 86F; PREVIOUS 85F IN 1922 10/6 - EQUALED RECORD HIGH TEMPERATURE 83F; ALSO IN 1990. 10/19- EQUALED RECORD HIGH MINIMUM TEMPERATURE 63F; PREVIOUS IN 1928. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR OCTOBER 20 HIGH 78 IN 1965,1984 LOW 24 IN 1972 PRECIP 7.10 INCHES IN 1996 (RECORD FOR MONTH) SNOWFALL TRACE IN 1934,1943 PEAK GUST 63 MPH W IN 1966 RECORDS FOR OCTOBER 21 HIGH 79 IN 1979 LOW 24 IN 1974 PRECIP 2.39 INCHES IN 1944 SNOWFALL TRACE IN 1895,1907,1940 PEAK GUST 69e MPH S IN 1976 TODAY'S REPORT PREPARED By: Mike Iacono