BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA   DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, NOVEMBER 13, 2013 ALL TIMES ARE IN EASTERN STANDARD TIME   COLDEST OF SEASON TO DATE AT 21F THIS MORNING FIRST MEASURABLE SNOW OF THE SEASON YESTERDAY A TRACE OF SNOW REMAINS ON GROUND THIS MORNING   YESTERDAY... The rain/slush mix abruptly transitioned to all snow at approximately 7:21 a.m.  The transition from rain to snow was quite apparent.  A wall of white could be seen slowly progressing southward across the area, eventually enveloping the summit beginning at 7:21 a.m.   Check out the member area of bluehill.org for a photo.   Snowfall reached 0.2 inch on the summit, making this the first measurable snowfall of the season.  The liquid to snow ratio was 1:4 or 5.  Light accumulation was visible on nearby Chickatawbut Hill (3 miles E).  Little if any accumulation was visible below an elevation of about 450-500 feet. A trace of snow was still on the ground early this morning. The record snowfall for November 12 is 8.1 inches in 1987.   Light snow was observed on Sunday, November 3 and Friday, November 8, but no accumulation occurred on those dates.   The long term (1886-2012) average date of the first snowfall is November 18, and the 30-year (1981-2010) average date of the first snowfall is November 20.  Last year, the first measurable snowfall occurred on November 7 with 3.5 inches.   TODAY... A low temperature of 21F (21.0 in Hazen shelter) surpassed 24F for yesterday, occurring at midnight last night, and 27F back on November 4. This morning minimum was 13 degrees colder than average for the date, but well short of the record of 14F established in 1926. In addition, 21 degrees was the coldest it has been since 18F last March 18.   Today's Observations:   7 A.M. Weather: Clear, stratocumulus/cumulus layer along and offshore NE-SE and distant SSE, few stratocumulus along horizon distant to the WNW-NNW Temperature: 22F; Dew Point: 14F; Wind: WNW at 13 kts, Wind: Wind chill 10F Sea-level pressure: 30.25 ins. Hg, rising then rising more rapidly Visibility: 60 miles, except 70 miles NW, light rain and thin fog all quadrants 6-hr min temp: 21F 24-hr precip: 0.06 inch 24-hr snowfall: 0.2 inch BHO SA 1155 CLR 60 243/22/14/3013/025/ SC/CU LYR ALG/OFFSHR NE-SE AND DSNT SSE FEW SC ALG HRZN DSNT WNW-NW VSBY NW 70 LGT DSNT HZ WNDCHILL 10F TOTAL NEW SNW PST 24 HRS 0.2 IN/ 8/800 53012  MANUAL 70006 ASOS 70007 10023 20021   10 A.M. Weather: Clear, stratocumulus/cumulus layer distant offshore NE-SE, few stratocumulus along horizon distant WNW-NNW Temperature: 28F; Dew Point: 13F; Wind: NW at 14 kts, Wind: Direction variable W-NNW Sea-level pressure: 30.28 ins. Hg, rising then rising more slowly Visibility: 75 miles, light distant haze BHO SA 1455 CLR 75 253/28/13/3214/028/ SC/CU LYR DSNT OFFSHR NE-SE FEW SC DSNT WNW-NNW ALG HRZN/ LGT DSNT HZ WND 28V34/ 8/800 51010   1 P.M. Weather: Clear, stratocumulus/cumulus distant offshore ENE-SE, few cumulus/stratocumulus distant NW-NNW Temperature: 34F; Dew Point: 15F; Wind: NW at 11 kts, Wind: Direction variable W-NNW Sea-level pressure: 30.23 ins. Hg, falling then falling more rapidly Visibility: 80 miles, light distant haze 6-hr max temp: 35F BHO SA 1755 CLR 80 237/34/15/3111/023/ SC/CU DSNT ENE-SE OFFSHR FEW CU/SC DSNT NW-N LGT DSNT HZ WND 26V33/ 8/800 58016 10035 20022   WEATHER SUMMARY FOR TUESDAY, NOVEMBER 12, 2013   TEMPERATURE (DEGREES F) MAX.....48    NORMAL.....51 MIN.....24    NORMAL.....35 MEAN....36    NORMAL.....43   DEPARTURE FROM 30-YEAR NORMAL......................-7 TOTAL DEPARTURE FOR THE MONTH......................+2 [+0.0 DEGREE/DAY]   HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............29  DEPARTURE.........+7 TOTAL HEATING UNITS FOR THE MONTH.............247  DEPARTURE.........+3 TOTAL HEATING UNITS FOR THE SEASON............724  DEPARTURE........-83 TOTAL HEATING UNITS LAST SEASON TO DATE.......669  DIFFERENCE.......+55   PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..................42 SW  AT  1:19 A.M.                    AERO.......................43 SW  AT  1:19 A.M.                    ASOS.......................45 SW  AT  1:20 A.M.                     DAVIS......................41 SW  AT  1:19 A.M. FASTEST MILE FOR YESTERDAY....................30 WSW AT  2:06 A.M. *  MAXIMUM 2-MINUTE ASOS AVERAGE.................30 SW  AT  1:20 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE................28 WSW AT  1:40 A.M. AVERAGE WIND SPEED AND DIRECTION............14.2 NW                    ASOS.....................14.0                    DAVIS....................12.3 WNW [300 degrees] * last of several occurrences...   PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.06   DEPARTURE............-0.10                          ASOS..............0.07 TOTAL PRECIPITATION FOR THE MONTH..........0.66   DEPARTURE............-1.22                          ASOS..............0.64 TOTAL PRECIPITATION FOR THE YEAR..........43.61   DEPARTURE............-1.98                          ASOS..............N/A** **ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals   SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M.......0.2     DEPARTURE.............+0.2 TOTAL SNOWFALL FOR THE MONTH.............0.2     DEPARTURE.............-0.2 TOTAL SNOWFALL FOR THE SEASON............0.2     DEPARTURE.............-0.5   PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 2013 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust RMY:  RMY = R.M. Young wind gust recording system added 8/9/2011 TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized   11/1  68/56/62/+16/0.10/0.0/012/02        60 SSW AERO N/A N/A    RMY 66 11/2  65/49/57/+11/0.00/0.0/296/48        22 WSW AERO N/A N/A    RMY 23 11/3  49/30/40/-6/0.06/T/135/22           23 N   AERO N/A N/A    RMY N/A 11/4  42/27/35/-10/0.00/0.0/588/96        24 NNE AERO N/A N/A    RMY 25 11/5  50/29/40/-5/0.00/0.0/487/80         16 SSW AERO N/A N/A    RMY 17 11/6  59/40/50/+5/0.00/0.0/419/69         30 SSW AERO 31 MPH SSW RMY 33 11/7  65/37/51/+6/0.31/0.0/079/13         33 SW  AERO 37 MPH SW  RMY 37 11/8  48/31/40/-4/T/T/0.0/421/70          37 WNW AERO 37 MPH WNW RMY 39 11/9  44/29/37/-7/0.00/0.0/361/66         25 WNW AERO 25 MPH WNW RMY 29 11/10 52/40/46/+2/0.08/0.0/108/18         31 WNW AERO 33 MPH WNW RMY N/A 11/11 51/36/44/+1/0.00/0.0/.../..         36 WNW AERO 37 MPH WNW RMY 37 11/12 48/24/36/-7/0.11/0.2/000/00         42 SW  AERO 43 MPH SW  RMY 43   11/13 morning low temp: 21F; the normal low is now 34F   DAILY RECORDS FOR NOVEMBER 2013 None so far.   DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):   RECORDS FOR NOVEMBER 13 HIGH 66 IN 1931, 1964 LOW 14 IN 1920 PRECIP 1.96 INCHES IN 1982 SNOWFALL 4.6 IN 2004 PEAK GUST 77 S IN 1982   RECORDS FOR NOVEMBER 14 HIGH 70 IN 1993 LOW 11 IN 1905 PRECIP 2.08 INCHES IN 2009 SNOWFALL 3.5 IN 1997 PEAK GUST 63 W IN 2003   TODAY'S REPORT PREPARED BY: Robert Skilling