BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, JANUARY 7, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME QUIET AND COOL WITH INCREASING CLOUDS... Another ho-hum day here at the observatory with light wind and increasing cloud cover as we move through the early afternoon. Visibility has been excellent today at 70 miles. The high temperature today has been 37F. This is 3 degrees above the daily normal maximum of 34F. The low since midnight is 29F, which is 11 degrees above the normal low of 18F. Today's Observations: 7 A.M. Weather: Scattered cirrostratus, thin broken cirrus, few stratocumulus offshore distant NE-ESE and distant SSE-SSW Temperature: 30F; Dew Point: 17F; Wind: WSW at 10 kts Sea-level pressure: 30.04 ins. Hg, rising steadily Visibility: 60 miles 6-hr Max temp: 32F 6-hr Min temp: 29F 24-hr Precip:   Trace 24-hr Snowfall: Trace BHO SA 1155 250 SCT E300 –BKN 60 172/30/17/2410/004/ FEW SC OFFSHR DSNT NE-ESE AND DSNT SSE-SSW/ 8/508 51017 70000 10032 20029 10 A.M. Weather: Broken cirrocumulus, thin broken cirrus, few stratocumulus distant W-N and offshore distant NE-ESE Temperature: 33F; Dew Point: 21F; Wind: SW at 8 kts Sea-level pressure: 30.07 ins. Hg, rising, then more slowly Visibility: 70 miles 3-hr Precip:  0.00 ins. 3-hr Snowfall: 0.0 ins. BHO SA 1455 E200 BKN 250 –BKN 70 184/33/21/2208/007/ FEW SC DSNT W-N AND OFFSHR DSNT NE-ESE/ 8/509 51012 1 P.M. Weather: Broken cirrocumulus, thin broken cirrus, few stratocumulus distant NW-NE-E Temperature: 36F; Dew Point: 18F; Wind: W at 8 kts Sea-level pressure: 30.01 ins. Hg, falling, then more rapidly Visibility: 70 miles 6-hr Max temp: 37F 6-hr Min temp: 29F 6-hr Precip:  0.00 ins. 6-hr Snowfall: 0.0 ins. BHO SA 1755 E180 BKN 250 –BKN 70 161/36/18/2608/001/ FEW SC DSNT NW-NE-E/ 8/509 58023 10037 20029 SUMMARY FOR MONDAY, JANUARY 6, 2020 TEMPERATURE (DEGREES F) MAX.....33   NORMAL.....34 MIN.....23   NORMAL.....18 MEAN....28   NORMAL.....26 DEPARTURE FROM 30-YEAR NORMAL..................... +2 TOTAL DEPARTURE FOR THE MONTH.....................+56 [+9.1 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............37  DEPARTURE....... -2 TOTAL HEATING UNITS FOR THE MONTH..............176  DEPARTURE.......-56 TOTAL HEATING UNITS FOR THE SEASON............2427  DEPARTURE......-109 TOTAL HEATING UNITS LAST SEASON TO DATE.......2473  DEPARTURE.......-46 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................26 W   AT  8:49 P.M.                      AERO.........................21 W   AT  8:55 P.M.                      ASOS.........................25 W   AT  8:55 P.M.                    DAVIS........................27 W   AT  8:48 P.M. RMY N/A FASTEST MILE FOR YESTERDAY......................24 W   AT  8:54 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................20 W   AT  8:55 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................21 W   AT  8:47 P.M. AVERAGE WIND SPEED AND DIRECTION.............. 7.7 SW                                    ASOS....................... 8.2                    DAVIS...................... 7.8 WSW [235 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...TRACE  DEPARTURE......-0.14                          ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........0.30  DEPARTURE......-0.56                          ASOS..............0.31 TOTAL PRECIPITATION FOR THE YEAR...........0.30  DEPARTURE......-0.56                          ASOS..............0.31 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M........TRACE  DEPARTURE.......-0.5 TOTAL SNOWFALL FOR THE MONTH................0.5  DEPARTURE.......-2.8 TOTAL SNOWFALL FOR THE SEASON..............20.5  DEPARTURE.......+1.2 PRELIMINARY CLIMATE SUMMARY FOR DECEMBER CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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 12/01  32/16/24/-13/..../5.8/011/02           33 ENE AERO 32 ENE RMY N/A 12/02  37/25/31/-5/..../2.7/000/00            52 NE  AERO 47 NE  RMY 53 12/03  30/23/27/-9/..../4.6/000/00            32 N   AERO 35 N   RMY 36 12/04  34/22/28/-7/..../0.0/000/00            23 WNW AERO 23 NNW RMY N/A 12/05  41/26/34/-1/..../0.0/343/62            33 NW  AERO 35 NW  RMY 37 12/06  33/23/28/-7/0.02/0.1/000/00            25 NW  AERO 23 NW  RMY 29 12/07  31/18/25/-9/0.00/0.0/519/94            25 NW  AERO 23 NW  RMY N/A 12/08  36/15/26/-8/0.00/0.0/402/73            31 SSW AERO 32 SSW RMY N/A 12/09  57/36/47/+13/..../0.0/000/00           53 S   AERO 52 S   RMY 54 12/10  58/37/48/+15/..../0.0/044/08           35 SW  AERO 39 SW  RMY N/A 12/11  36/23/30/-3/..../3.0/236/43            25 NW  AERO 25 NW  RMY N/A 12/12  29/17/23/-10/..../1.8/488/89           29 W   AERO 30 W   RMY 25 12/13  46/22/34/+2/..../0.0/000/00            25 SSE AERO 25 SSE RMY N/A 12/14  58/46/52/+20/..../0.0/000/00           45 S   AERO 41 S   RMY N/A 12/15  48/28/38/+6/0.00/0.0/284/52            53 W   AERO 53 W   RMY 50 12/16  30/25/28/-3/0.00/0.0/000/00            36 W   AERO 36 W   RMY N/A 12/17  35/23/29/-2/..../1.0/000/00            22 NNW AERO 21 NE  RMY 23 12/18  33/18/26/-5/.../0.0/229/42             44 WNW AERO 45 WNW RMY N/A 12/19  20/9/15/-15/.../0.0/534/98             51 W   AERO 47 W   RMY N/A 12/20  29/11/20/-10/0.00/0.0/540/99           32 W   AERO 30 W   RMY 29 12/21  31/16/24/-6/0.00/0.0/163/30            16 SSE AERO 15 SSE RMY N/A 12/22  40/26/33/+4/0.00/0.0/212/39           23 SW  AERO 21 SW  RMY 23 12/23  54/33/44/+15/0.00/0.0/540/99          30 WSW AERO 30 SW  RMY 30 12/24  42/29/36/+7/0.00/0.0/507/93           30 NW  AERO 27 NW  RMY 30 12/25  42/25/34/+6/0.00/0.0/289/53           16 NNE AERO 16 N   RMY N/A 12/26  39/29/34/+6/0.00/0.0/174/32           22 ENE AERO 20 ENE RMY 22 12/27  47/31/39/+11/0.00/0.0/000/00          32 SSW AERO 30 SSW RMY 34 12/28  47/30/39/+11/0.00/0.0/470/86          23 W   AERO 22 W   RMY N/A 12/29  42/28/35/+8/..../0.0/383/70           22 WNW AERO 21 WNW RMY 23 12/30  36/32/34/+7/..../0.8/000/00           40 E   AERO 37 E   RMY 37 12/31  40/32/36/+9/..../0.0/000/00           35 E   AERO 32 E   RMY N/A     PRELIMINARY CLIMATE SUMMARY FOR JANUARY CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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 01/01  38/30/34/+7/..../0.0/..../..           39 W   AERO 38 W   RMY 41 01/02  46/29/38/+11/0.00/0.0/..../..          28 SW  AERO 28 SW  RMY 30 01/03  46/40/43/+17/0.00/0.0/..../..          21 SW  AERO 18 SW  RMY N/A 01/04  46/36/41/+15/..../0.0/..../..          16 NNW AERO 16 NNW RMY N/A 01/05  36/24/30/+4/..../0.5/..../..           43 NW  AERO 46 NW  RMY 43 01/06  33/23/28/+2/T/T/..../..                26 W   AERO 21 W   RMY N/A 01/07  The low since midnight is 29F, daily normal minimum is 18F DAILY RECORDS FOR DECEMBER 12/01/19: DAILY RECORD SNOWFALL OF 5.8 INS.,           BREAKS PREVIOUS RECORD OF 2.0 INS. SET IN 1902. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):   RECORDS FOR JANUARY 7 HIGH 60F IN 1930 LOW -8F IN 2018 PRECIP 1.97 INS. IN 1977 SNOWFALL 16.0 INS. IN 1977 PEAK GUST 74 MPH NW IN 1968 RECORDS FOR JANUARY 8 HIGH 65F IN 2008 LOW -8F IN 1968 PRECIP 1.70 INS. IN 1958,1979 SNOWFALL 12.5 INS. IN 1996 PEAK GUST 77 MPH NNW IN 1958 TODAY'S REPORT PREPARED BY: Matt Douglas