BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, JANUARY 20, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME PLENTY OF SUNSHINE TODAY, BUT VERY COLD AND DRY.... Despite the abundance of sunshine today, the air mass over the region is of Arctic origin and is very cold. Temperatures this morning were in the low teens, and have only recovered to the mid 20s this afternoon. Today will be a rare below normal day this month (only the 4th). The dew point has been sitting in the single digits indicating how extremely the dry the air is. With the Arctic air mass, very clear air is in place and has resulted in visibility of around 80 miles most of the day. The high so far today is 25F, 8 degrees below the normal high of 33F. The low since midnight is 12F, this is 5 degrees below the normal low of 17F. Today's Observations: 7 A.M. Weather: Broken altocumulus/altostratus, Stratocumulus offshore distant NE-SE Temperature: 12F; Dew Point: 5F; Wind: NW at 10G18 kts Sea-level pressure: 30.07 ins. Hg, rising, then more rapidly Visibility: 70 miles 6-hr Max temp: 18F 6-hr Min temp: 12F 24-hr Precip:  0.00 ins. 24-hr Snowfall: 0.0 ins. Snow depth: 2 ins. BHO SA 1155 E65 BKN 70 182/12/5/3210G18/007/ SC OFFSHR DSNT NE-SE AND DSNT SSE-S VIRGA NW AND DSNT S/ 8/570 4/002 53039 10018 20012 10 A.M. Weather: Clear, stratocumulus offshore distant NE-SE, few altocumulus distant NE-E-SE, few cirrus distant NNE-NE Temperature: 17F; Dew Point: 6F; Wind: NW at 10G19 kts Sea-level pressure: 30.13 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 80 203/17/6/3310G19/013/ SC OFFSHR DSNT NE-SE FEW AC DSNT NE-E-SE FEW CI DSNT NNE-NE/ 8/571 51021   1 P.M. Weather: Clear, stratocumulus offshore distant NE-SE Temperature: 24F; Dew Point: 6F; Wind: NW at 12G18 kts Sea-level pressure: 30.14 ins. Hg, rising, then steady Visibility: 80 miles 6-hr Max temp: 24F 6-hr Min temp: 12F 6-hr Precip:  0.00 ins. 6-hr Snowfall: 0.0 ins. Snow depth: 2 ins BHO SA 1755 CLR 80 205/24/6/3212G18/014/ SC OFFSHR DSNT NE-SE/ 8/500 4/002 50002 10024 20012 SUMMARY FOR SUNDAY, JANUARY 19, 2020 TEMPERATURE (DEGREES F) MAX.....40   NORMAL.....33 MIN.....21   NORMAL.....17 MEAN....31   NORMAL.....25 DEPARTURE FROM 30-YEAR NORMAL..................... +6 TOTAL DEPARTURE FOR THE MONTH....................+172 [+8.8 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............34  DEPARTURE....... -6 TOTAL HEATING UNITS FOR THE MONTH..............579  DEPARTURE......-169 TOTAL HEATING UNITS FOR THE SEASON............2830  DEPARTURE......-222 TOTAL HEATING UNITS LAST SEASON TO DATE.......2990  DEPARTURE......-160 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................44 W   AT   4:36 P.M.                      AERO.........................44 W   AT   7:02 P.M.                      ASOS.........................43 WNW AT   4:37 P.M.                    DAVIS........................45 W   AT   4:35 P.M. RMY 42 FASTEST MILE FOR YESTERDAY......................34 W   AT   4:53 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................29 W   AT   4:54 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................31 W   AT   4:52 P.M. AVERAGE WIND SPEED AND DIRECTION..............14.5 W                                    ASOS.......................14.8                    DAVIS......................14.2 WNW [288 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.14                          ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........0.89  DEPARTURE......-1.82                          ASOS..............0.89 TOTAL PRECIPITATION FOR THE YEAR...........0.89  DEPARTURE......-1.82                          ASOS..............0.89 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M......... 0.0  DEPARTURE.......-0.5 TOTAL SNOWFALL FOR THE MONTH............... 4.2  DEPARTURE.......-6.4 TOTAL SNOWFALL FOR THE SEASON..............24.2  DEPARTURE.......-2.4 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  28/16/22/-4/..../0.0/.../..            43 WNW AERO 40 WNW RMY N/A 01/10  48/23/36/11/T/..../0.0/.../..          37 SW  AERO 37 SW  RMY 39 01/11  65/46/56/+31/..../0.0/.../..           53 SSW AERO 53 SSW RMY N/A           01/12  68/36/52/+27/..../0.0/.../..           60 SSW AERO 62 SSW RMY N/A 01/13  39/31/35/+10/0.01/T/.../..             21 NE  AERO 20 NE  RMY N/A 01/14  38/31/35/+10/0.01/0.0/.../..           16 W   AERO 15 W   RMY N/A 01/15  48/35/42/+17/0.00/0.0/.../..           24 W   AERO 23 W   RMY 24 01/16  42/24/33/+8/0.06/T/.../..              54 W   AERO 52 W   RMY 59     01/17  24/10/17/-8/0.00/0.0/..../..           50 NW  AERO 48 NW  RMY N/A 01/18  28/8/18/-7/0.35/2.8/..../..            28 WSW AERO 24 ESE RMY N/A 01/19  40/21/31/+6/0.02/0.2/..../..           44 W   AERO 44 W   RMY 42 01/19 The low since midnight is 12F, daily normal minimum is 17F DAILY RECORDS FOR JANUARY 1/11/20: DAILY RECORD MAXIMUM TEMPERATURE OF 65F,           BREAKS PREVIOUS RECORD OF 60F SET IN 1975. 1/11/20: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 46F,           BREAKS PREVIOUS RECORD OF 40F SET IN 1983. 1/12/20: DAILY RECORD MAXIMUM TEMPERATURE OF 68F,           BREAKS PREVIOUS RECORD OF 60 SET IN 2018.          TIES HIGHEST MAXIMUM FOR JANUARY,           ADDITIONAL 68F ON 1/26/1950. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):   RECORDS FOR JANUARY 20 HIGH 59F IN 1951 LOW -9F IN 1901 PRECIP 1.95 INS. IN 1978 SNOWFALL 19.0 INS. IN 1978 PEAK GUST 76e MPH NE IN 1978 RECORDS FOR JANUARY 21 HIGH 65F IN 1906 LOW -4F IN 1888,1893 PRECIP 2.49 INS. IN 1979 SNOWFALL 9.0 INS. IN 2014 PEAK GUST 78e MPH SE IN 1979 TODAY'S REPORT PREPARED BY: Matt Douglas