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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, OCTOBER 16, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

SEASONAL WEATHER WITH INCREASING CLOUDS AND 
DECENT VISIBILITY....

Today we observed almost clear skies this morning, though
cloud cover increased to overcast by noontime. This is 
due to the approaching low pressure center off the coast.
Wind remained southeasterly, and steady around 10 mph. 
Visibility was a decent 70 miles throughout the day, 
however decreasing slightly after the 1 P.M. observation.
The weather remained dry, with dew points in the upper 
30's and low 40's. Pressure has been steadily dropping, 
by more than 4 millibars between 7 A.M. and 1 P.M.  

The high so far today is 61F, a degree above the daily
normal maximum of 60F. The low since midnight is 45F, 
2 degrees above the normal minimum of 43F. 

PRELIMINARY STATS FOR SEPTEMBER 2019

TEMPERATURE, Deg. F
Avg. Max. 73.6 [+2.0]
Avg. Min. 54.5 [-0.1]
Mean      64.1 [+1.0]
24-hour corrected mean: 63.4
Max. for month: 88F on the 23rd
Min. for month: 43F on the 19th

HEATING DEGREE DAYS
Total heating units:    81 [-36]
Total for the season:   93 [-49]
Total for last season:  87

COOLING DEGREE DAYS
Total cooling units:    58  [-2]
Total for the season:  680 [+83]
Total for last season: 863

PRECIPITATION, Inches
Total: 1.27 [-2.79]
Greatest in 24 hrs: 0.37 ins. on the 2nd 

WIND, mph
Avg. uncorrected wind speed: 10.3 mph
Avg. corrected wind speed:   10.9 mph
Prevailing wind direction:   SSW [11%]
Peak gust and direction:     39 W on the 2nd

SUNSHINE:
Campbell-Stokes card minutes: 14790 minutes of possible 21582 or 69%
Astronomical total minutes: 15399 minutes of possible 22468 or 69%

Today's Observations:

7 A.M.
Weather: Scattered cirrus
Temperature: 50F; Dew Point: 42F; Wind: SE at 10 kts
Sea-level pressure: 30.07 ins. Hg, falling steadily
Visibility: 75 miles
6-hr Max temp: 50F
6-hr Min temp: 45F
BHO SA 1155 250 SCT 75 183/50/42/1510/007/ 8/002 58011 
10050 20045

10 A.M.
Weather: Scattered stratocumulus, broken altostratus,
broken cirrostratus
Temperature: 59F; Dew Point: 38F; Wind: SE at 10G18 kts
Sea-level pressure: 30.01 ins. Hg, falling steadily 
Visibility: 70 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 50 SCT E110 BKN 250 BKN 70 164/59/38/1410G18/001/ 
8/878 58019

1 P.M.
Weather: Scattered stratocumulus, broken altostratus, overcast
cirrostratus
Temperature: 58F; Dew Point: 42F; Wind: SE at 8 kts
Sea-level pressure: 29.93 ins. Hg, falling then falling
more rapidly
Visibility: 70 miles
6-hr Max temp: 61F
6-hr Min temp: 49F
6-hr Precip: 0.00 ins. 
BHO SA 1755 40 SCT E140 BKN 240 OVC 70 141/58/42/1208/993/ 
8/878 58023 10061 20049


SUMMARY FOR TUESDAY, OCTOBER 15, 2019 

TEMPERATURE (DEGREES F)
MAX.....61   NORMAL.....61
MIN.....43   NORMAL.....43
MEAN....52   NORMAL.....52

DEPARTURE FROM 30-YEAR NORMAL......................0
TOTAL DEPARTURE FOR THE MONTH.....................+1 [-0.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............13  DEPARTURE..........0
TOTAL HEATING UNITS FOR THE MONTH..............159  DEPARTURE.........-5
TOTAL HEATING UNITS FOR THE SEASON.............252  DEPARTURE........-54
TOTAL HEATING UNITS LAST SEASON TO DATE........203  DEPARTURE........+49

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY................0  DEPARTURE..........0
TOTAL COOLING UNITS FOR THE MONTH................2  DEPARTURE.........-2
TOTAL COOLING UNITS FOR THE SEASON.............682  DEPARTURE........+81
TOTAL COOLING UNITS LAST SEASON TO DATE........874  DEPARTURE.......-192

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................18 NNW AT 9:06 A.M. 
                   AERO.........................17 NNW AT 9:07 A.M. 
                   ASOS.........................21 NW  AT 9:07 A.M.
                   DAVIS........................21 NW  AT 1:51 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY......................15 WNW AT 1:52 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................14 NW  AT 9:07 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................15 NW  AT 9:06 A.M.
AVERAGE WIND SPEED AND DIRECTION.................7.8 WNW
                   ASOS..........................8.2  
                   DAVIS.........................8.3 WNW [288 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..........2.66  DEPARTURE......+0.44
                         ASOS..............2.76
TOTAL PRECIPITATION FOR THE YEAR..........41.08  DEPARTURE......-0.23
                         ASOS.............40.99

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/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

9/01  73/56/65/-3/0.00/703/89                21 ENE AERO 14 ENE RMY 18
9/02  75/57/66/-2/0.37/165/21                39 W   AERO 41 W   RMY 41
9/03  77/61/69/+2/0.00/643/82                18 S   AERO 16 S   RMY N/A
9/04  83/61/72/+5/0.00/375/48                30 SW  AERO 28 SW  RMY 30
9/05  68/54/61/-6/0.00/513/66                23 NW  AERO 17 NW  RMY N/A
9/06  65/56/61/-6/0.03/054/07                37 ENE AERO 36 ENE RMY 36
9/07  70/51/61/-5/0.27/325/42                37 N   AERO 37 N   RMY N/A
9/08  73/53/63/-3/0.00/631/82                25 W   AERO 21 W   RMY N/A
9/09  71/54/63/-3/0.00/537/70                17 SE  AERO 16 SE  RMY 16
9/10  73/57/65/0/0.00/207/27                 25 S   AERO 25 S   RMY N/A
9/11  83/63/73/+8/0.00/419/55                31 SW  AERO 32 SW  RMY N/A
9/12  70/52/61/-4/0.11/015/02                29 ENE AERO 28 ENE RMY 28
9/13  65/49/57/-7/0.00/741/98                29 ENE AERO 27 ENE RMY 27
9/14  69/49/59/-5/0.19/030/04                36 S   AERO 37 S   RMY 37
9/15  78/62/70/+6/0.00/600/80                24 W   AERO 23 W   RMY 22
9/16  72/54/63/0/T/673/90                    25 WNW AERO 23 WNW RMY 25
9/17  67/49/58/-5/0.00/611/82                23 NW  AERO 23 N   RMY N/A
9/18  61/49/55/-7/0.00/579/78                26 NE  AERO 25 NE  RMY 25
9/19  67/43/55/-7/0.00/709/96                17 NE  AERO 18 NE  RMY N/A
9/20  78/50/64/+2/0.00/677/92                21 W   AERO 18 W   RMY 20
9/21  83/60/72/+11/0.00/689/94               21 WNW AERO 18 WNW RMY N/A
9/22  85/62/74/+13/0.00/687/94               24 SW  AERO 23 SW  RMY 25
9/23  88/65/77/+17/0.00/539/74               29 SSW AERO 28 SSW RMY 29
9/24  76/56/66/+6/0.04/616/85                26 W   AERO 26 W   RMY 27  
9/25  73/50/62/+2/0.00/686/95                22 W   AERO 21 W   RMY 21
9/26  79/55/67/+8/0.25/388/54                38 SW  AERO 37 SW  RMY 39
9/27  72/50/61/+2/0.00/695/97                23 S   AERO 23 S   RMY 22
9/28  78/55/67/+9/0.00/664/93                31 S   AERO 29 S   RMY 30
9/29  75/53/64/+6/0.00/619/87                24 NW  AERO 23 NW  RMY 23
9/30  62/49/56/-2/0.00/609/86                23 NNE AERO 16 NNE RMY N/A


PRELIMINARY CLIMATE SUMMARY FOR OCTOBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/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

10/01  67/52/60/+3/0.06/.../..               28 SW  AERO 25 SSW RMY 29
10/02  74/49/62/+5/0.42/.../..               30 ENE AERO 25 ENE RMY 28
10/03  51/46/49/-7/..../.../..               28 ENE AERO 26 ENE RMY N/A
10/04  59/40/50/-6/..../.../..               38 NNW AERO 38 NNW RMY 38
10/05  58/35/47/-9/0.00/.../..               21 N   AERO 18 SSW RMY N/A
10/06  65/44/55/0/0.00/.../..                36 SSW AERO 35 SSW RMY N/A
10/07  77/57/67/+12/0.12/.../..              47 SSW AERO 46 SSW RMY 49
10/08  60/52/56/+2/T/.../..                  22 NE  AERO 18 NW  RMY N/A
10/09  55/49/52/-2/..../.../..               43 NE  AERO 37 NE  RMY 44
10/10  54/47/51/-3/..../.../..               41 NE  AERO 37 NE  RMY 42
10/11  52/48/50/-3/..../000/00               41 NE  AERO 39 NE  RMY 41
10/12  52/49/51/-2/..../.../..               39 NE  AERO 37 NE  RMY N/A
10/13  66/48/57/+4/..../.../..               18 WNW AERO 17 WNW RMY 18
10/14  67/51/59/+7/..../.../..               18 WSW AERO 17 WSW RMY N/A
10/15  61/43/52/0/..../.../..                18 NNW AERO 17 NNW RMY N/A

10/16 The low since midnight is 45F, normal daily minimum is 43F


DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR OCTOBER 16
HIGH 86F IN 1897
LOW 28F IN 1886
PRECIP 2.82 INCHES IN 1974
SNOWFALL TRACE IN 2009
PEAK GUST 68e MPH SSE IN 1954 (HURRICANE HAZEL)

RECORDS FOR OCTOBER 17
HIGH 86F IN 1947
LOW 25F IN 1886
PRECIP 1.87 INCHES IN 1989
SNOWFALL TRACE IN 1970
PEAK GUST 55 MPH NE IN 1964

TODAY'S REPORT PREPARED BY: Benjamin Turner and Greg White