BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, JANUARY 3, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME OVERCAST, BUT CONTINUED MILD TEMPERATURES.... Overcast skies has been the theme today with no sunshine to speak of thus far. Despite the cloud cover, temperatures are rather mild reaching into the mid 40s. As a matter of fact it never really cooled that much last night with the overnight low of 40 degrees. Wind has been quite light today, but generally out of a southwesterly direction. Visibility has been limited thanks in part to an inversion that's been in place all day. A thin smoke layer has been observed all day thus far as well. The low since midnight is 40F, 22 degrees above the normal low of 18F. The high so far today is 46F, 11 degrees above the daily normal maximum of 35F. Today's Observations: 7 A.M. Weather: Overcast altocumulus/altostratus Temperature: 42F; Dew Point: 30F; Wind: SW at 12 kts Sea-level pressure: 29.79 ins. Hg, rising, then falling Visibility: 35 miles 6-hr Max temp: 42F 6-hr Min temp: 40F 24-hr Precip: 0.00 ins. 24-hr Snowfall: 0.0 ins. BHO SA 1155 E110 OVC 35 088/42/30/2212/979/ FEW BINOVC DSNT E THN K LYR ALQDS/ 8/07/ 50001 10042 20040 10 A.M. Weather: Overcast altocumulus/altostratus Temperature: 43F; Dew Point: 32F; Wind: SW at 8 kts Sea-level pressure: 29.82 ins. Hg, rising unsteadily Visibility: 50 miles 3-hr Precip: 0.00 ins. 3-hr Snowfall: 0.0 ins. BHO SA 1455 E110 OVC 50 099/43/32/2208/982/ THN K LYR ALNG HRZN ALQDS/ 8/07/ 51011 1 P.M. Weather: Overcast altostratus Temperature: 45F; Dew Point: 34F; Wind: W at 3 kts Sea-level pressure: 29.74 ins. Hg, falling, then more rapidly Visibility: 50 miles 6-hr Max temp: 46F 6-hr Min temp: 41F 6-hr Precip: 0.00 ins. 6-hr Snowfall: 0.0 ins. BHO SA 1755 E100 OVC 50 070/45/34/2603/974/ THN K LYR ALNG HRZN ALQDS WND LGT/ 8/05/ 58029 10046 20041 SUMMARY FOR THURSDAY, JANUARY 2, 2020 TEMPERATURE (DEGREES F) MAX.....46 NORMAL.....35 MIN.....29 NORMAL.....19 MEAN....38 NORMAL.....27 DEPARTURE FROM 30-YEAR NORMAL.....................+11 TOTAL DEPARTURE FOR THE MONTH.....................+18 [+8.8 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............27 DEPARTURE.......-11 TOTAL HEATING UNITS FOR THE MONTH...............58 DEPARTURE.......-19 TOTAL HEATING UNITS FOR THE SEASON............2309 DEPARTURE.......-72 TOTAL HEATING UNITS LAST SEASON TO DATE.......2354 DEPARTURE.......-45 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................28 SW AT 7:16 P.M. AERO.........................28 SW AT 7:28 P.M. ASOS.........................30 SW AT 7:15 P.M. DAVIS........................28 SW AT 7:13 P.M. RMY 30 FASTEST MILE FOR YESTERDAY......................24 SSW AT 7:38 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................22 SSW AT 7:48 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................21 SW AT 7:47 P.M. AVERAGE WIND SPEED AND DIRECTION..............12.8 SW ASOS.......................13.2 DAVIS......................12.8 SW [235 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE......-0.15 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........0.00 DEPARTURE......-0.44 ASOS..............0.00 TOTAL PRECIPITATION FOR THE YEAR...........0.00 DEPARTURE......-0.44 ASOS..............0.00 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.......-0.6 TOTAL SNOWFALL FOR THE MONTH................0.0 DEPARTURE.......-1.7 TOTAL SNOWFALL FOR THE SEASON..............20.0 DEPARTURE.......+4.0 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/..../.. 23 SW AERO 21 SW RMY 23 12/23 54/33/44/+15/0.00/0.0/..../.. 30 WSW AERO 30 SW RMY 30 12/24 42/29/36/+7/0.00/0.0/..../.. 30 NW AERO 27 NW RMY 30 12/25 42/25/34/+6/0.00/0.0/..../.. 16 NNE AERO 16 N RMY N/A 12/26 39/29/34/+6/0.00/0.0/..../.. 22 ENE AERO 20 ENE RMY 22 12/27 47/31/39/+11/0.00/0.0/..../.. 32 SSW AERO 30 SSW RMY 34 12/28 47/30/39/+11/0.00/0.0/..../.. 23 W AERO 22 W RMY N/A 12/29 42/28/35/+8/..../0.0/..../.. 22 WNW AERO 21 WNW RMY 23 12/30 36/32/34/+7/..../0.8/..../.. 40 E AERO 37 E RMY 37 12/31 40/32/36/+9/..../0.0/..../.. 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 The low since midnight is 40F, daily normal minimum is 19F 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 3 HIGH 64F IN 2000 LOW -4F IN 1904 PRECIP 1.93 INS. IN 1999 SNOW 11.3 INS. 1996 PEAK GUST 92 MPH S IN 1960 RECORDS FOR JANUARY 4 HIGH 60F IN 2000 LOW -8F IN 1904, 1981 PRECIP 1.79 INS. IN 1982 SNOW 16.5 INS. IN 2018 PEAK GUST 84 MPH S IN 1982 TODAY'S REPORT PREPARED BY: Matt Douglas