BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, JANUARY 9, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME AN ALMOST CLEAR DAY WITH A COLD NORTHWESTERLY WIND.... Today we observed a visibility increase following an almost 20 millibar rise in pressure overnight. The visibility of 65 miles this morning rose to 85 miles by 1 P.M. Pressure continued to trend upward, leaving the sky with little to mention as far as cloud cover. A stiff 20 mph wind has persisted from the northwest, keeping temperatures cold despite abundant sunshine. The high temperature so far today is 26F, 8 degrees below the daily normal maximum of 34F. The low since midnight is 16F, which is a degree below the normal low of 17F. PRELIMINARY STATS FOR NOVEMBER 2019 TEMPERATURE, Deg. F Avg. Max. 39.1 [0.0] Avg. Min. 25.0 [+1.4] Mean      32.1 [+0.8] 24-hour corrected mean: 32.3 Max. for month: 58F on the 10th Min. for month: 9F on the 19th HEATING DEGREE DAYS Total heating units:   1014 [-29] Total for the season:  2251 [-54] Total for last season: 2295 PRECIPITATION, Inches Total: 7.81 [+2.92] Greatest in 24 hrs: N/A SNOWFALL, Inches Total: 19.9 [+6.5] Greatest in 24 hrs: 5.8 ins. on the 1st-2nd WIND, mph Avg. uncorrected wind speed: 13.2 mph Avg. corrected wind speed:   13.6 mph Prevailing wind direction:   W [20%] Peak gust and direction:     53 S,W on the 9th, 15th SUNSHINE: Campbell-Stokes card minutes: 6168 minutes of possible 16470 or 37% Astronomical total minutes: 6368 minutes of possible 17000 or 37% Today's Observations: 7 A.M. Weather: Clear, few distant cumulus Temperature: 16F; Dew Point: 5F; Wind: WNW at 13G22 kts Sea-level pressure: 30.51 ins. Hg, rising quickly Visibility: 65 miles 6-hr Max temp: 21F 6-hr Min temp: 16F 24-hr Precip:  0.01 ins. 24-hr Snowfall: Trace BHO SA 1155 CLR 65 333/16/5/2913G22/051/ FEW DSNT CU ALQDS/ 8/100 53052 10021 20016 10 A.M. Weather: Clear, few distant cumulus Temperature: 17F; Dew Point: 5F; Wind: WNW at 10G20 kts Sea-level pressure: 30.65 ins. Hg, rising, then more slowly Visibility: 80 miles 3-hr Precip:  0.00 ins. 3-hr Snowfall: 0.0 ins. BHO SA 1455 CLR 80 380/17/5/2910G20/065/ FEW DSNT CU ALQDS/ 8/100 51047 1 P.M. Weather: Clear, few cirrostratus Temperature: 26F; Dew Point: 5F; Wind: W at 12G21 kts Sea-level pressure: 30.63 ins. Hg, rising then falling Visibility: 85 miles 6-hr Max temp: 26F 6-hr Min temp: 16F 6-hr Precip:  0.00 ins. 6-hr Snowfall: 0.0 ins. BHO SA 1755 CLR 85 375/26/5/3012G21/063/ FEW DSNT CS ALQDS/ 8/005 58005 10026 20016 SUMMARY FOR WEDNESDAY, JANUARY 8, 2020 TEMPERATURE (DEGREES F) MAX.....39   NORMAL.....34 MIN.....22   NORMAL.....18 MEAN....31   NORMAL.....26 DEPARTURE FROM 30-YEAR NORMAL..................... +5 TOTAL DEPARTURE FOR THE MONTH.....................+69 [+8.4 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............34  DEPARTURE....... -5 TOTAL HEATING UNITS FOR THE MONTH..............241  DEPARTURE.......-69 TOTAL HEATING UNITS FOR THE SEASON............2492  DEPARTURE......-123 TOTAL HEATING UNITS LAST SEASON TO DATE.......2551  DEPARTURE.......-59 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................50 W   AT  8:48 P.M.                      AERO.........................46 WNW AT  3:32 P.M.                      ASOS.........................51 WNW AT  9:17 P.M.                    DAVIS........................49 W   AT  5:30 P.M. RMY 47 FASTEST MILE FOR YESTERDAY......................39 W   AT  9:18 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................36 WNW AT  8:49 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................39 W   AT  8:48 P.M. AVERAGE WIND SPEED AND DIRECTION..............14.2 W                                    ASOS.......................13.1                    DAVIS......................14.5 WNW [284 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.01  DEPARTURE......-0.13                          ASOS..............0.01 TOTAL PRECIPITATION FOR THE MONTH..........0.35  DEPARTURE......-0.79                          ASOS..............0.35 TOTAL PRECIPITATION FOR THE YEAR...........0.35  DEPARTURE......-0.79                          ASOS..............0.35 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M........TRACE  DEPARTURE.......-0.6 TOTAL SNOWFALL FOR THE MONTH................1.2  DEPARTURE.......-3.3 TOTAL SNOWFALL FOR THE SEASON..............21.2  DEPARTURE.......+0.7 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     DAILY RECORDS FOR DECEMBER 12/01/19: DAILY RECORD SNOWFALL OF 5.8 INS.,           BREAKS PREVIOUS RECORD OF 2.0 INS. SET IN 1902. 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  38/29/34/+8/..../0.4/.../..            30 WSW AERO 28 WSW RMY N/A 01/08  39/22/31/+5/..../0.4/.../..            50 W   AERO 46 WNW RMY 47 01/09  The low since midnight is 16F, daily normal minimum is 17F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):   RECORDS FOR JANUARY 9 HIGH 62F IN 1937 LOW -9F IN 1968 PRECIP 3.00 INS. IN 1956 SNOWFALL 10.0 INS. IN 1904 PEAK GUST 101e MPH SE IN 1978 [RECORD FOR MONTH] RECORDS FOR JANUARY 10 HIGH 58F IN 2016 LOW -7F IN 2004 PRECIP 2.16 INS. IN 1935 SNOWFALL 6.3 INS. IN 1977 PEAK GUST 73e SE IN 1977 TODAY'S REPORT PREPARED BY: Benjamin Turner