BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JANUARY 16, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

STRONG NORTHWESTERLY WINDS WITH MOSTLY CLOUDY
SKIES ATOP GREAT BLUE HILL....

Today we experienced thick fog, significant wind, 
and mostly cloudy skies. The morning started off 
foggy with a maximum visibility of 3 miles, decreasing 
to a 1/2 mile by the 10 A.M. observation. By 1 P.M., 
the visibility increased to 75 miles. Wind reached 55 
MPH, occurring around noontime.

Despite significant cold air advection from the 
northwest, the temperature was still above seasonal 
averages. The high so far today is 41 degrees, this 
is 8 degrees above the normal high of 33 degrees. 
The low since midnight is 33 degrees, this is 18 
degrees above the normal low of 15 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: 1.64 inches on the 1st-2nd 

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: Overcast stratocumulus
Temperature: 34F; Dew Point: 34F; Wind: SE at 12 kts
Sea-level pressure: 29.80 ins. Hg, falling rapidly
Visibility: 3 miles, fog
6-hr Max temp: 37F
6-hr Min temp: 33F
24-hr Precip:  0.02 ins.
24-hr Snowfall: 0.0 ins. 
BHO SA 1155 E40 OVC 3F 093/34/34/1312/980/ 8/4// 70002 58052 
10037 20033

10 A.M.
Weather: Fog
Temperature: 37F; Dew Point: 37F; Wind: WSW at 11G17 kts
Sea-level pressure: 29.71 ins. Hg, falling, then more slowly
Visibility: 1/2 mile, fog
3-hr Precip:  0.04 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 X W3 1/2F 060/37/37/2411G17/971/ 8//// 6004/ 56033 

1 P.M.
Weather: Broken stratocumulus
Temperature: 40F; Dew Point: 30F; Wind: WNW at 26G38 kts,
Peak wind: 55 MPH (48 kts) WNW at 11:51 A.M.
Sea-level pressure: 29.63 ins. Hg, falling steadily
Visibility: 75 miles
6-hr Max temp: 41F
6-hr Min temp: 34F
6-hr Precip:  0.04 ins.
6-hr Snowfall: Trace
BHO SA 1755 E40 BKN 75IP 036/40/30/2926G38/963/ IPBUKNEUKN PCPN 
VRY LGT PK WND 3048/1651/ 8/400 6004/ 55024 10041 20034


SUMMARY FOR WEDNESDAY, JANUARY 15, 2020 

TEMPERATURE (DEGREES F)
MAX.....48   NORMAL.....33
MIN.....35   NORMAL.....17
MEAN....42   NORMAL.....25

DEPARTURE FROM 30-YEAR NORMAL.....................+17
TOTAL DEPARTURE FOR THE MONTH....................+171 [+11.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............23  DEPARTURE.......-17
TOTAL HEATING UNITS FOR THE MONTH..............418  DEPARTURE......-170
TOTAL HEATING UNITS FOR THE SEASON............2669  DEPARTURE......-223
TOTAL HEATING UNITS LAST SEASON TO DATE.......2838  DEPARTURE......-169

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................24 W   AT  8:01 A.M.  
                   AERO.........................23 W   AT  7:56 A.M.   
                   ASOS.........................23 W   AT  8:00 A.M. 
                   DAVIS........................24 W   AT  7:30 A.M. RMY 24
FASTEST MILE FOR YESTERDAY......................20 W   AT  7:34 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................18 W   AT  8:07 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................19 W   AT  8:02 A.M.
AVERAGE WIND SPEED AND DIRECTION.............. 9.8 W                 
                   ASOS....................... 9.9 
                   DAVIS......................10.4 W [268 deg.]


PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.02  DEPARTURE......-0.13
                         ASOS..............0.02
TOTAL PRECIPITATION FOR THE MONTH..........0.48  DEPARTURE......-1.66
                         ASOS..............0.51
TOTAL PRECIPITATION FOR THE YEAR...........0.48  DEPARTURE......-1.66
                         ASOS..............0.51

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M......... 0.0  DEPARTURE.......-0.6
TOTAL SNOWFALL FOR THE MONTH............... 1.2  DEPARTURE.......-7.3
TOTAL SNOWFALL FOR THE SEASON..............21.2  DEPARTURE.......-3.3


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/-13/0.87/5.7/011/02           33 ENE AERO 32 ENE RMY N/A
12/02  37/25/31/-5/1.04/2.7/000/00            52 NE  AERO 47 NE  RMY 53
12/03  30/23/27/-9/0.52/3.1/000/00            32 N   AERO 35 N   RMY 36
12/04  34/22/28/-7/0.00/0.0/000/00            23 WNW AERO 23 NNW RMY N/A
12/05  41/26/34/-1/0.00/0.0/343/62            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/+13/0.62/0.0/000/00           53 S   AERO 52 S   RMY 54
12/10  58/37/48/+15/0.28/0.0/044/08           35 SW  AERO 39 SW  RMY N/A
12/11  36/23/30/-3/0.48/4.8/236/43            25 NW  AERO 25 NW  RMY N/A
12/12  29/17/23/-10/0.00/0.0/488/89           29 W   AERO 30 W   RMY 25
12/13  46/22/34/+2/0.11/0.0/000/00            25 SSE AERO 25 SSE RMY N/A
12/14  58/46/52/+20/1.35/0.0/000/00           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/-2/0.79/1.0/000/00            22 NNW AERO 21 NE  RMY 23
12/18  33/18/26/-5/T/0.0/229/42               44 WNW AERO 45 WNW RMY N/A
12/19  20/9/15/-15/0.00/0.0/534/98            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/+8/0.08/0.0/383/70            22 WNW AERO 21 WNW RMY 23
12/30  36/32/34/+7/1.34/0.8/000/00            40 E   AERO 37 E   RMY 37
12/31  40/32/36/+9/0.33/0.0/000/00            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  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 The low since midnight is 33F, 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 16
HIGH 63F IN 1995
LOW -12F IN 2004
PRECIP 1.32 INS. IN 1936
SNOWFALL 14.0 INS. IN 1965
PEAK GUST 79 MPH WNW IN 1960

RECORDS FOR JANUARY 17
HIGH 55F IN 1973,1995
LOW -8F IN 1907,1982
PRECIP 1.43 INS. IN 1956
SNOWFALL 13.4 INS. IN 1956
PEAK GUST 62 MPH S IN 1994

TODAY'S REPORT PREPARED BY: Ben Turner