BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, JANUARY 14, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME CLOUDY AND COOL THE THEME TODAY, OVERALL QUIET WEATHER.... Not much to talk about today, another day of light wind and cloudy skies. A light onshore flow has allowed low cloud cover to overspread the region, bringing yet another day with no sunshine recorded. The high for today is 38 degrees, this is 5 degrees above the normal high of 33 degrees. The low since midnight is 31 degrees, this is 14 degrees above the normal low of 17 degrees. PRELIMINARY STATS FOR DECEMBER 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: Broken stratus fractus, overcast altostratus Temperature: 33F; Dew Point: 32F; Wind: NW at 6 kts, Sea-level pressure: 30.35 ins. Hg, rising, then falling Visibility: 10 miles 6-hr Max temp: 33F 6-hr Min temp: 31F 24-hr Precip: 0.01 ins. 24-hr Snowfall: Trace. BHO SA 1155 E70 BKN 180 OVC 10 278/33/32/3306/035/ THN F ALQDS MOON DMLY VSBL WND LGT TOTAL NEW SNOW LAST 24HRS TRACE/ 8/07/ 58002 70001 10033 20031 10 A.M. Weather: Broken stratus fractus, broken altostratus, broken cirrostatus, thin overcast cirrus Temperature: 36F; Dew Point: 34F; Wind: NE at 5 kts, Sea-level pressure: 30.36 ins. Hg, rising, then falling Visibility: 10 miles 3-hr Precip: 0.00 ins. 3-hr Snowfall: 0.0 ins. BHO SA 1455 E7 BKN 70 BKN 200 BKN 250 –OVC 10 280/36/34/0505/036/ FEW BINOVC NW THN F ALQDS WND LGT/ 8/776 50002 1 P.M. Weather: Overcast stratus Temperature: 37F; Dew Point: 32F; Wind: SE at 4 kts, Sea-level pressure: 30.27 ins. Hg, falling, then more rapidly Visibility: 40 miles 6-hr Max temp: 38F 6-hr Min temp: 31F 6-hr Precip: 0.00 ins. 6-hr Snowfall: 0.0 ins. BHO SA 1755 E10 OVC 40 250/37/32/1204/027/ HAZY WND LGT/ 8/5// 58030 10038 20033 SUMMARY FOR MONDAY, JANUARY 13, 2020 TEMPERATURE (DEGREES F) MAX.....39 NORMAL.....34 MIN.....31 NORMAL.....17 MEAN....35 NORMAL.....25 DEPARTURE FROM 30-YEAR NORMAL.....................+10 TOTAL DEPARTURE FOR THE MONTH....................+144 [+10.8 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............30 DEPARTURE.......-10 TOTAL HEATING UNITS FOR THE MONTH..............365 DEPARTURE......-143 TOTAL HEATING UNITS FOR THE SEASON............2616 DEPARTURE......-196 TOTAL HEATING UNITS LAST SEASON TO DATE.......2758 DEPARTURE......-142 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................21 NE AT 2:08 A.M. AERO.........................20 NE AT 2:08 A.M. ASOS.........................22 NNE AT 2:08 A.M. DAVIS........................21 NE AT 2:07 A.M. RMY N/A FASTEST MILE FOR YESTERDAY......................15 NE AT 2:09 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................16 NE AT 2:09 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................16 NE AT 2:08 A.M. AVERAGE WIND SPEED AND DIRECTION.............. 6.4 E ASOS....................... 6.7 DAVIS...................... 6.8 ENE [070 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..........0.45 DEPARTURE......-1.40 ASOS..............0.99 TOTAL PRECIPITATION FOR THE YEAR...........0.45 DEPARTURE......-1.40 ASOS..............0.99 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.......-6.1 TOTAL SNOWFALL FOR THE SEASON..............21.2 DEPARTURE.......-2.1 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 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 The low since midnight is 31F, 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 14 HIGH 65F IN 1995 LOW -12F IN 1914 PRECIP 1.45 INS. IN 2008 SNOWFALL 10.3 INS. IN 2008 PEAK GUST 68 MPH WNW IN 1976, S IN 2005 RECORDS FOR JANUARY 15 HIGH 64F IN 1995 LOW -16F IN 1957 [RECORD FOR MONTH] PRECIP 2.63 INS. IN 1958 SNOWFALL 8.8 INS. IN 1983 PEAK GUST 69e MPH SE IN 1940 TODAY'S REPORT PREPARED BY: Matt Douglas