BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, OCTOBER 10, 2015 ALL TIMES ARE IN EASTERN STANDARD TIME COLD FRONT PASSES OVERNIGHT, BRINGING 45 MPH GUST AND 0.27 INCHES OF NEW RAIN Yesterday's gusty conditions produced a peak wind gust of 45 MPH at 12:37 PM EST from the South along with a midnight to midnight average wind speed of 17.5 MPH. From 1:00 PM to 2:00 PM EST yesterday afternoon wind's averaged 28 MPH. Rain showers began at approximately 3:00 PM EST in the afternoon with occasional waves of moderate to heavy rainfall totaling 0.27 inches. By midnight temperatures dropped sharply from near 60F to an overnight low of 44F. Clear conditions this morning along with an intrusion of drier, cooler air produced excellent visibility of 80 miles in all directions at the 7:00 AM EST observation. By the 10:00 AM EST observation mostly clear skies were still present with some cirrostratus slowly advancing toward the station from the NW. Today's Observations: 7 A.M. Weather: Clear, few cumulus NE-ESE, few cirrus distant E-SW, few stratocumlus distant NW-N Temperature: 45F; Dew Point: 40F; Wind: NW at 7 kts, Sea-level pressure: 30.06 ins. Hg, rising, then more slowly Visibility: 80 miles 6-hr Max temp: 50F 6-hr Min temp: 44F 24-hr precip: 0.27 ins. BHO SA 1155 CLR 80 178/45/40/3207/006/ FEW CU NE-ESE FEW CI DSNT E-SW FEW SC DSNT NW-N/ 8/801 51028 ASOS 70028 MANUAL 70027 10050 20044 10 A.M. Weather: Clear, few small cumulus in all directions, few cirrostratus distant W-NNE, few cirrus distant E-SSW Temperature: 53F; Dew Point 38F; Wind: N at 9G16 kts, Sea-level pressure: 30.10 ins. Hg, rising, then more slowly Visibility: 75 miles BHO SA 1455 CLR 75 194/53/38/3609G16/010/ FEW SML CU ALQDS FEW CS DSNT W-NNE FEW CI DSNT E-SSW/ 8/105 51016 SUMMARY FOR FRIDAY, OCTOBER 9, 2015 TEMPERATURE (DEGREES F) MAX.....68 NORMAL.....63 MIN.....50 NORMAL.....45 MEAN....59 NORMAL.....54 DEPARTURE FROM 30-YEAR NORMAL........................+5 TOTAL DEPARTURE FOR THE MONTH.......................-16 [-2.0 DEGREES/DAY] COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY...............0 DEPARTURE...........0 TOTAL COOLING UNITS FOR THE MONTH...............0 DEPARTURE..........-2 TOTAL COOLING UNITS FOR THE SEASON............810 DEPARTURE........+211 TOTAL COOLING UNITS LAST SEASON TO DATE.......587 DIFFERENCE.......+223 HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............6 DEPARTURE..........-5 TOTAL HEATING UNITS FOR THE MONTH.............101 DEPARTURE.........+12 TOTAL HEATING UNITS FOR THE SEASON............144 DEPARTURE.........-87 TOTAL HEATING UNITS LAST SEASON TO DATE.......182 DIFFERENCE........-38 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY...................45 S AT 12:37 P.M. ASOS........................47 S AT 12:37 P.M. DAVIS.......................47 S AT 12:36 P.M. RMY 49 FASTEST MILE FOR YESTERDAY.................... 35 S AT 1:21 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE..................33 S AT 1:12 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.................33 S AT 1:12 P.M. AVERAGE WIND SPEED AND DIRECTION..............17.5 s ASOS.......................16.8 DAVIS..................... 15.6 SSW [211 DEG] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.27 DEPARTURE.....+0.13 ASOS...............0.28 TOTAL PRECIPITATION FOR THE MONTH...........0.79 DEPARTURE.....-0.54 ASOS...............0.78 TOTAL PRECIPITATION FOR THE YEAR...........34.19 DEPARTURE.....-5.48 ASOS................N/A *** *** ASOS annual total not available due to erroneous readings PRELIMINARY CLIMATE SUMMARY FOR OCTOBER CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY GUST RMY: R.M. Young wind gust recording system TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 10/1 55/51/53/-4/..../.../.. 39 NE RMY N/A 10/2 51/47/49/-8/..../.../.. 40 NE RMY 43 10/3 51/45/48/-8/..../000/00 38 NE RMY N/A 10/4 55/49/52/-4/0.00/.../.. 35 E RMY 40 10/5 59/46/53/-3/T/.../.. 21 NE RMY 20 10/6 68/43/56/+1/0.00/.../.. 17 NW RMY 17 10/7 69/46/58/+3/0.00/.../.. 20 W RMY 20 10/8 63/49/56/+2/0.00/.../.. 21 S RMY N/A 10/9 68/50/59/+5/0.27/.../.. 45 S RMY 49 10/10 low since midnight is 44F; normal low is now 45F DAILY RECORDS FOR OCTOBER 2015 -NONE SO FAR. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR OCTOBER 10 HIGH 85F IN 1949 LOW 27F IN 1929 PRECIP 2.02 INCHES IN 1998 SNOWFALL 6.8 INCHES IN 1979 (RECORD FOR MONTH) PEAK GUST 59 MPH WNW IN 1958 RECORDS FOR OCTOBER 11 HIGH 80F IN 1919,1949 LOW 28F IN 1993 PRECIP 0.96 INCHES IN 1903 SNOWFALL (NONE) PEAK GUST 66e MPH WNW IN 1941 TODAY'S REPORT PREPARED BY: Brian Fitzgerald