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

TUESDAY, OCTOBER 20, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

FOGGY AND COOL WITH A LIGHT SOUTHEASTERLY WIND....

Today we observed a limited morning visibility due 
to fog, then haze later on in the day. This yielded 
a visibility of a 1/16th mile, then 25 miles later
on in the day. Wind is southeasterly, with a max gust 
of 22 mph. The average speed slightly exceeded 10 mph. 
Weather conditions are overcast, with some breaks to 
the west following the 1 P.M. observation.   

The high so far today is 66F, 7 degrees above the daily 
normal minimum of 59F. The low since midnight is 49F, 
8 degrees above the normal low of 41F.



Today's Observations:

7 A.M.
Weather: Fog
Temperature: 52F; Dew Point: 52F; Relative Humidity: 100%
Wind: S at 11 kts
Sea-level pressure: 30.28 ins. Hg: rising, then more slowly
Visibility: 1/16th mile, fog 
6-hr Max temp: 52F
6-hr Min temp: 49F
24-hr Precip: 0.00 ins.
BHO SA 1155 X W3 1/16F 253/52/52/1711/028/ 8//// 53002 
10052 20049

10 A.M.
Weather: Overcast stratus
Temperature: 56F; Dew Point: 56F; Relative Humidity: 100%
Wind: S at 7 kts
Sea-level pressure: 30.29 ins. Hg: falling then rising
Visibility: 4 miles, fog 
3-hr Precip: 0.00 ins.
BHO SA 1455 30 OVC 4F 256/56/56/1807/029/ 8/6// 50003

1 P.M.
Weather: Overcast altostratus
Temperature: 64F; Dew Point: 58F; Relative Humidity: 80%
Wind: SSE at 8 kts
Sea-level pressure: 30.26 ins. Hg: falling steadily
Visibility: 25 miles, thin fog
6-hr Max temp: 66F
6-hr Min temp: 52F
6-hr Precip: 0.00 inches
BHO SA 1755 60 OVC 25 245/64/58/2208/026/ HAZY/ 8/01/ 
58011 10066 20052


SUMMARY FOR MONDAY, OCTOBER 19, 2020 

TEMPERATURE (DEGREES F)
MAX.....61   NORMAL.....59
MIN.....46   NORMAL.....42
MEAN....54   NORMAL.....50

DEPARTURE FROM 30-YEAR NORMAL.................+4
TOTAL DEPARTURE FOR THE MONTH................+46 [+2.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY.............11  DEPARTURE..... -4
TOTAL HEATING UNITS FOR THE MONTH............170  DEPARTURE.....-51
TOTAL HEATING UNITS FOR THE SEASON...........268  DEPARTURE.....-95
TOTAL HEATING UNITS LAST SEASON TO DATE......310  DEPARTURE.....-42

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY............. 0  DEPARTURE...... 0                   
TOTAL COOLING UNITS FOR THE MONTH............. 1  DEPARTURE..... -4
TOTAL COOLING UNITS FOR THE SEASON...........831  DEPARTURE....+229
TOTAL COOLING UNITS LAST SEASON TO DATE......682  DEPARTURE....+149

PEAK WIND GUST FOR YESTERDAY (MPH) 
                   420C/Official...............16 ESE AT   3:04 P.M.  
                   AEROVANE (south tower)......16 SSE AT   7:45 P.M. 
                   ASOS........................16 E   AT   3:14 P.M.
                   DAVIS #1....................16 ESE AT   9:41 P.M.
                   DAVIS #2 (south tower)......19 SSE AT   7:36 P.M. 
                   RMY.........................21
                   MERLIN......................20
FASTEST MILE FOR YESTERDAY.....................14 SSE AT  10:24 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................13 S   AT  10:25 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE..............13 E   AT   2:57 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE..............15 S   AT   7:38 P.M.
AVERAGE WIND SPEED AND DIRECTION.............6.8 SE [163 total miles]        
                   ASOS......................7.6
                   DAVIS #1..................7.3 SE   [144 deg.]
                   DAVIS #2..................7.5 SE   [147 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..........4.14  DEPARTURE....+1.31
                         ASOS..............4.13
TOTAL PRECIPITATION FOR THE YEAR..........38.56  DEPARTURE....-3.35
                         ASOS.............39.34


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  75/56/66/+9/0.00/.../..             28 SW   AERO 28 SW   RMY N/A
10/02  63/49/56/-1/0.02/.../..             20 NW   AERO 21 NW   RMY 20 
10/03  65/45/55/-1/0.00/.../..             19 WNW  AERO 19 WNW  RMY 19
10/04  65/45/55/-1/0.00/.../..             17 ESE  AERO 18 ESE  RMY 18
10/05  62/52/57/+1/0.00/.../..             17 ENE  AERO 17 ENE  RMY N/A
10/06  69/51/60/+5/0.00/.../..             28 S    AERO 28 S    RMY 29
10/07  73/50/62/+7/0.14/.../..             76 W    AERO 74 W    RMY 70  TSTM
10/08  61/42/52/-2/0.00/.../..             41 W    AERO 41 W    RMY N/A
10/09  60/37/49/-5/0.00/.../..             25 SSW  AERO 28 SSW  RMY N/A
10/10  75/52/64/+10/0.00/.../..            40 SSW  AERO 40 SSW  RMY 38
10/11  64/47/56/+3/0.00/.../..             32 NNW  AERO 35 NNW  RMY N/A
10/12  52/48/50/-3/T/.../..                28 E    AERO 27 E    RMY N/A
10/13  57/49/53/0/1.74/.../..              32 E    AERO 33 E    RMY N/A
10/14  67/47/57/+5/0.00/.../..             23 WNW  AERO 25 WNW  RMY N/A
10/15  71/50/61/+9/0.00/.../..             43 S    AERO 46 S    RMY 42
10/16  68/48/58/+7/..../.../..             28 S    AERO 30 S    RMY N/A
10/17  56/39/48/-3/..../.../..             35 WNW  AERO 40 WNW  RMY 37
10/18  60/46/53/+2/0.00/.../..             20 ESE  AERO 21 ESE  RMY 20
10/19  61/46/54/+4/0.00/.../..             16 ESE  AERO 16 SSE  RMY N/A

10/20 The low since midnight is 49F, the daily normal low is 41F


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

RECORDS FOR OCTOBER 20
HIGH 78F IN 1965,1984
LOW 24F IN 1972
PRECIP 7.10 INCHES IN 1996 (RECORD FOR MONTH)
SNOWFALL TRACE IN 1934,1943
PEAK GUST 63 MPH W IN 1966

RECORDS FOR OCTOBER 21
HIGH 79F IN 1979
LOW 24F IN 1974
PRECIP 2.39 INCHES IN 1944
SNOWFALL TRACE IN 1895,1907,1940
PEAK GUST 69e MPH S IN 1976

TODAY'S REPORT PREPARED BY: Benjamin Turner