BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA   DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, JANUARY 16, 2013    ALL TIMES ARE IN EASTERN STANDARD TIME   2.5 INCHES SNOWFALL AS OF 7 A.M. 3.5 INCHES SNOWFALL THROUGH 10 A.M.   Snow began between 3 and 4 A.M. this morning and as of 7 A.M. the measurement was 2.5 inches of snow on the boards with visibility 1/4 mile in moderate snow and fog. Total melted; 0.24 inch The snowfall rate was 1 in. per hour   SNOW GOES OVER TO LIGHT FREEZING RAIN/DRIZZLE  HERE AT THE SUMMIT   Snow accumulated another 1.0 inch between 7 A.M. and 10 A.M.; that was the end of it. A change to light freezing rain and light freezing drizzle occurred as snow ended at an unknown time between 9 and 10 A.M. Marginally light freezing rain to non-freezing rain was still occurring early this afternoon with only a very light glaze accumulation.  It appears that the final snow accumulation for this event will be 3.5 inches with all of that falling between 3 A.M. and about 9 A.M.    Today's observations:   7 A.M. Weather: Partial obscurement with overcast stratus, snow and fog obscuring 7/10 of sky, moderate snow and fog, snow increased one inch past hour, total new snow past 24 hours 2.5 ins. Temperature: 30F; Dew Point: 30F; Wind: N at 7 kts Sea-level pressure: 30.10 ins. Hg, falling then more rapidly   Visibility: 1/4 miles, moderate snow and fog  6-hr min. temp: 30F 6-hour precip: 0.24 in. 6-hour snowfall: 2.5 ins. 24-hour precip: 0.24 in. BHO SA 1155 –X E4 OVC 1/4SF 193/30/30/0107/010/ SF7 SNOINCR 1/3/3 TOTAL NEW SNW PST 24 HRS 2.5 INS/ 8/6// 58020 4/003 58020 MANUAL 6024/ ASOS 60023 MANUAL 70024 ASOS 70023 10033 20030   10 A.M. Weather: Obscurement with heavy fog, snow ended unknown time during past hour, light freezing rain and drizzle and thin glaze Temperature: 31F; Dew Point: 31F; Wind: ENE at 4 kts, Sea-level pressure: 30.01 ins. Hg, FALLING RAPIDLY Visibility: 1/16 mile, light freezing rain, light freezing drizzle and heavy fog 3-hour snowfall: 1.0 in. 3-hour precip: 0.11 in.  BHO SA 1455 W3 X 1/16ZR-ZL-F 163/31/31/0604/001/ SEZRZLBUKN THN GLZ PRESFR TOTAL NEW SNW PST 3 HRS 1.0 IN WND LGT/ 8//// 58030 ASOS 60013 MANUAL 6011/   1 P.M. Weather: Obscurement with heavy fog, light freezing rain occurring, freezing drizzle ended past hour, thin glaze   Temperature: 32F; Dew Point: 32F; Wind: N at 7 kts, Wind: Gradually backing Sea-level pressure: 29.91 ins. Hg, falling then more slowly Visibility: 1/16 mile, heavy fog, light freezing rain 6-hour max temp: 32F  6-hour min temp: 29F 6-hour snowfall: 1.0 in. 6-hour precip: 0.17 in.  BHO SA 1755 W3 X 1/16ZR-F 128/32/32/3507/991/ ZLEUKN THN GLZ WND GRDLY BACKING/ 8//// 56035 MANUAL 6017/ ASOS 60018 10032 20029   WEATHER SUMMARY FOR TUESDAY, JANUARY 15   TEMPERATURE (DEGREES F) MAX.....40      NORMAL.....33 MIN.....33      NORMAL.....17 MEAN....37      NORMAL.....25   DEPARTURE FROM 30-YEAR NORMAL......................+12 TOTAL DEPARTURE FOR THE MONTH.....................+124 [+8.1 DEGREES/DAY]   HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............28    DEPARTURE.........-12 TOTAL HEATING UNITS FOR THE MONTH...........465    DEPARTURE........-123 TOTAL HEATING UNITS FOR THE SEASON.........2493    DEPARTURE........-399 TOTAL HEATING UNITS LAST SEASON TO DATE....2252    DIFFERENCE.......+241   PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY...............17 N   AT  9:04 A.M.                    AERO....................16 NNW AT  1:58 A.M.                    ASOS....................17 N   AT  9:04 A.M.                    DAVIS...................16 NW  AT  2:00 A.M. RMY 17 THE FASTEST MILE FOR YESTERDAY.............11 N   AT  9:06 A.M.  MAXIMUM 2-MINUTE ASOS AVERAGE..............13 N   AT  9:05 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.............12 NNW AT  9:05 A.M. AVERAGE WIND SPEED AND DIRECTION......... 6.3 NNW                    ASOS.................. 6.0                    DAVIS..................5.7 NNW [340 deg.] * last of several occurrences   PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M... 0.24   DEPARTURE..........+0.09                          ASOS..............0.23 TOTAL PRECIPITATION FOR THE MONTH..........0.42   DEPARTURE..........-1.72                          ASOS..............0.38 TOTAL PRECIPITATION FOR THE YEAR...........0.42   DEPARTURE..........-1.72                          ASOS..............0.38   SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M.........2.5   DEPARTURE............+1.9 TOTAL SNOWFALL FOR THE MONTH...............2.6   DEPARTURE............-5.9 TOTAL SNOWFALL FOR THE SEASON.............18.0   DEPARTURE............-6.5      PRELIMINARY CLIMATE SUMMARY FOR JANUARY 2013 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/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   1/1   35/18/27/0/0.00/0.0/313/57      44 WNW AERO 44 MPH WNW RMY 45 1/2   29/11/20/-7/0.00/0.0/457/83     35 WNW AERO 35 MPH WNW RMY 33 1/3   23/2/13/-13/0.00/0.0/529/96     24 WNW AERO 23 MPH WNW RMY 23 1/4   38/19/29/+3/0.00/0.0/320/58     35 W   AERO 36 MPH W   RMY 36 1/5   40/27/34/+8/0.00/0.0/536/97     36 WNW AERO 37 MPH WNW RMY 38 1/6   42/27/35/+9/T/0.1/471/85        29 SW  AERO 29 MPH SW  RMY 29 1/7   38/27/33/+7/0.00/0.0/538/97     29 NW  AERO 27 MPH NW  RMY N/A 1/8   45/27/36/+10/0.00/0.0/428/77    39 SW  AERO 42 MPH SW  RMY 41 1/9   42/31/37/+11/T/0.0/033/06       40 W   AERO 39 MPH W   RMY N/A 1/10  45/32/39/+14/0.00/0.0/.../..    47 WNW AERO 48 MPH WNW RMY 50 1/11  38/29/34/+9/0.15/0.0/.../..     23 SE  AERO 21 MPH SE  RMY 23  1/12  43/35/40/+15/0.02/0.0/000/00    21 SE  AERO 18 MPH SE  RMY 15 1/13  50/41/46/+21/0.01/0.0/000/00    30 SW  AERO 30 MPH SW  N/A 1/14  59/40/50/+25/T/0.0/.../..       36 S   AERO 37 MPH S   RMY 39 1/15  40/33/37/+12/T/0.0/.../..       17 N   AERO 16 MPH NNW RMY 17   1/16  morning low temp: 29F; the normal low is now 17F       low occurred at 8 A.M.         DAILY RECORDS FOR JANUARY 2013 None so far.   DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):   RECORDS FOR JANUARY 16 HIGH 63F IN 1995 LOW -12F IN 2004 PRECIP 1.32 INS. IN 1936 SNOWFALL 14.0 INS. IN 1965 PEAK GUST 79 MPH WNW IN 1960   RECORDS FOR JANUARY 17 HIGH 55F IN 1973,1995 LOW -8F IN 1907,1982 PRECIP 1.43 INS. IN 1956 SNOWFALL 13.4 INS. IN 1956 PEAK GUST 62 MPH S IN 1994   TODAY'S REPORT PREPARED BY: Robert Skilling