BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, OCTOBER 11, 2018  ALL TIMES ARE IN EASTERN STANDARD TIME OVERCAST AND FOGGY WITH DECREASING TEMPERATURES IN THE AFTERNOON.... Pressure has decreased by over 5 mb between the 7 A.M.  and the 1 P.M. observations. Winds have also shifted from S to NE shortly after 1 P.M. Fog has limited visibility to 5 miles throughout the day. Temperatures have increased to  70F so far today. This is 8 degrees above the normal maximum of 62F. Before the wind shift, temperatures decreased from  70F to 62F around noontime. The low since midnight is 62F,  which is 17 degrees above our normal low of 45F.   PRELIMINARY STATS FOR SEPTEMBER 2018 TEMPERATURE, Deg. F Avg. Max. 72.5 [+0.9] Avg. Min. 58.6 [+4.0] Mean 65.6 [+2.5] 24-hour corrected mean: 64.8 Max. for month: 92F on 3rd, 6th Min. for month: 47F on 23rd HEATING DEGREE DAYS Total heating units: 87 [-30] Total for the season: 87 [-55] Total for last season: 93 COOLING DEGREE DAYS Total cooling units: 110 [+50] Total for the season: 863 [+266] Total for last season: 707 PRECIPITATION, Inches Total: 9.13 [+5.07] Greatest in 24 hrs: 3.32 ins. on the 18th-19th WIND, mph Avg. uncorrected wind speed: 9.4 Avg. corrected wind speed: 10.1 Prevailing wind direction: NE [12% of total hours] Peak gust and direction: 37 SSW SUNSHINE: Campbell-Stokes card minutes: 7608 minutes of possible 21582 or 35% Astronomical total minutes: 7924 minutes of possible 22447 or 35% BHO Lowest September Sunshine, hours (1886-2018): 1) 120.7 in 1934  [34%] 2) 126.8 in 2018  [35%] 3) 130.8 in 1889  [36%] 4) 131.1 in 1996  [36%] 5) 133.0 in 1907  [37%] BHO Wettest Septembers, inches (1886-2018): 1) 12.37 in 1999 2) 11.04 in 1933 3) 10.23 in 1896 4) 10.00 in 1961 5) 9.62 in 1987 6) 9.58 in 1888 7) 9.36 in 1918 8) 9.13 in 2018 9) 8.81 in 1907 10) 8.78 in 1996       Today's Observations: 7 A.M. Weather: Fog Temperature: 65F; Dew Point: 65F; Wind: S at 6 kts, Wind: Light Sea-level pressure: 29.83 ins. Hg, falling steadily        Visibility: 1/2 mile, fog 6-hr Max temp: 67F 6-hr Min temp: 64F 24-hr Precip: 0.00 ins.    BHO SA 1155 W3 X 1/2F 103/65/65/1706/983/ WND LGT/ 8////  56008 10067 20064 10 A.M. Weather: Overcast stratocumulus, few stratus fractus in all directions Temperature: 69F; Dew Point: 66F; Wind: S at 6 kts, Wind: Light  Sea-level pressure: 29.79 ins. Hg, falling rapidly Visibility: 5 miles, fog 3-hr Precip: 0.00 ins. BHO SA 1455 E15 OVC 5F 087/69/66/1806/979/ FEW STFA ALQDS  WND LGT/ 8/4// 58016 1 P.M. Weather: Overcast stratus Temperature: 62F; Dew Point: 61F; Wind: NE at 8 kts Sea-level pressure: 29.73 ins. Hg, falling rapidly     Visibility: 5 miles, fog 6-hr Max temp: 70F 6-hr Min temp: 62F  6-hr Precip: 0.00 ins. BHO SA 1755 E15 OVC 5F 069/62/61/0408/973/ 8/6// 58028  10070 20062     SUMMARY FOR WEDNESDAY, OCTOBER 10, 2018  TEMPERATURE (DEGREES F) MAX.....82   NORMAL.....62 MIN.....65   NORMAL.....45 MEAN....74   NORMAL.....54 DEPARTURE FROM 30-YEAR NORMAL......................+20 TOTAL DEPARTURE FOR THE MONTH......................+55 [+5.3 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............0   DEPARTURE........-12 TOTAL HEATING UNITS FOR THE MONTH..............52   DEPARTURE........-48 TOTAL HEATING UNITS FOR THE SEASON............139   DEPARTURE.......-104 TOTAL HEATING UNITS LAST SEASON TO DATE.......121   DIFFERENCE.......+18 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY...............9  DEPARTURE..........+9 TOTAL COOLING UNITS FOR THE MONTH..............11  DEPARTURE..........+7 TOTAL COOLING UNITS FOR THE SEASON............874  DEPARTURE........+273 TOTAL COOLING UNITS LAST SEASON TO DATE.......727  DIFFERENCE.......+147 PEAK GUST AND AVERAGE WIND SPEED (MPH)  PEAK WIND GUST FOR YESTERDAY....................24 WSW AT 1:58  P.M.                    AERO.........................23 WSW AT 1:57  P.M.                    ASOS.........................25 SW  AT 1:55  P.M.                    DAVIS........................25 W   AT 1:18  P.M. RMY 25 FASTEST MILE FOR YESTERDAY......................18 SW  AT 1:20  P.M.  MAXIMUM 2-MINUTE ASOS AVERAGE...................17 SW  AT 1:39  P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................19 W   AT 1:19  P.M. AVERAGE WIND SPEED AND DIRECTION..............12.6 WSW                    ASOS.......................12.5                     DAVIS......................12.7 WSW [245 deg.]    PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.15                          ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........1.40  DEPARTURE......-0.08                          ASOS..............1.40  TOTAL PRECIPITATION FOR THE YEAR..........48.48  DEPARTURE......+8.10                          ASOS.............50.32  PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST AERO: Aerovane wind recording system 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 M:    Missing data 9/01 75/58/67/-1/0.00/521/66        17 NE  AERO 15 NE  RMY 16  9/02 83/61/72/+4/0.00/684/87        20 SSW AERO 18 SSW RMY N/A  9/03 92/68/80/+13/0.00/650/83       24 WSW AERO 22 WSW RMY 25 9/04 88/70/79/+12/0.00/695/89       17 W   AERO 16 W   RMY 17  9/05 89/67/78/+11/0.00/638/82       23 SSW AERO 23 SSW RMY 25  9/06 92/70/81/+14/0.56/488/63       29 NNW AERO 29 NNW RMY N/A TSTM 9/07 70/63/67/+1/0.01/000/00        24 NE  AERO 22 NE  RMY N/A  9/08 68/54/61/-5/0.00/031/04        22 NE  AERO 18 NE  RMY 21 9/09 61/53/57/-9/0.00/000/00        23 NE  AERO 21 NE  RMY N/A 9/10 62/56/59/-6/..../000/00        30 E   AERO 28 E   RMY 28 9/11 75/61/68/+3/..../000/00        23 E   AERO 21 E   RMY N/A TSTM  9/12 69/63/66/+1/..../000/00        21 ENE AERO 21 ENE RMY 21  TSTM  9/13 68/62/65/+1/..../091/12        21 NE  AERO 21 NE  RMY N/A TSTM  9/14 75/61/68/+4/..../233/31        13 NE  AERO 12 ENE RMY 12  9/15 76/62/69/+5/0.01/218/29        14 SW  AERO 13 SW  RMY 13 9/16 84/61/73/+10/..../695/93       15 S   AERO 14 S   RMY N/A 9/17 82/64/73/+10/..../372/50       22 SSW AERO 22 SSW RMY N/A 9/18 74/67/71/+9/..../000/00        31 SSW AERO 30 SSW RMY N/A TSTM 9/19 66/57/62/0/..../007/01         28 NE  AERO 25 NE  RMY 26 9/20 63/55/59/-3/..../110/15        22 NE  AERO 21 NE  RMY 19 9/21 70/55/63/+2/..../352/48        37 SSW AERO 37 SSW RMY 41 9/22 70/51/61/0/..../175/24         37 SW  AERO 36 SW  RMY 30 9/23 60/47/54/-6/..../058/08        14 N   AERO 13 N   RMY N/A  9/24 55/50/53/-7/..../000/00        37 ENE AERO 35 ENE RMY 35 9/25 68/51/60/0/..../000/00         36 SE  AERO 37 SE  RMY 38 9/26 79/66/73/+14/..../244/34       35 SSW AERO 37 SSW RMY 37 9/27 66/56/61/+2/..../465/65        26 NNE AERO 25 NNE RMY 28 9/28 56/52/54/-4/..../029/04        24 NNE AERO 21 NNE RMY 23 9/29 71/50/61/+3/..../518/73        20 NW  AERO 18 NW  RMY 20 9/30 68/48/58/0/..../650/92         20 W   AERO 16 W   RMY N/A DAILY RECORDS FOR SEPTEMBER 09/04/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 70F,           BREAKS PREVIOUS RECORD OF 68F SET IN 1937 AND 1959 09/06/18: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 92F,           TIES PREVIOUS RECORD OF 92F SET IN 1900  PRELIMINARY CLIMATE SUMMARY FOR OCTOBER CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST AERO: Aerovane wind recording system 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 M:    Missing data 10/01 65/53/59/+2/..../.../..         21 ENE AERO 18 SSW RMY N/A 10/02 64/53/59/+2/..../.../..         33 S   AERO 32 S   RMY 35 TSTM 10/03 60/52/56/0/..../.../..          18 NNE AERO 14 NNE RMY 14 10/04 69/57/63/+7/..../.../..         29 SSW AERO 29 SSW RMY 32 10/05 64/47/56/0/..../.../..          25 NE  AERO 21 NE  RMY 24 10/06 64/45/55/0/0.00/.../..          23 SSW AERO 23 SSW RMY 25 10/07 75/56/66/+11/..../.../..        28 NE  AERO 24 ENE RMY 27 10/08 56/53/55/+1/..../.../..         22 ENE AERO 20 ENE RMY N/A 10/09 75/56/66/+12/..../.../..        26 WSW AERO 28 SW  RMY 29 10/10 82/65/74/+20/..../.../..        24 WSW AERO 23 WSW RMY 25 10/11 Low temp since midnight is 64F; normal low is 45F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): 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 RECORDS FOR OCTOBER 12 HIGH 87F IN 1954 LOW 31F IN 1906 PRECIP 1.53 INCHES IN 1948 SNOWFALL TRACE IN 1941 PEAK GUST 55 MPH NW IN 1963 TODAY'S REPORT PREPARED BY: Benjamin Turner