Tuesday, October 27, 2020

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

TUESDAY, OCTOBER 27, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

QUIET AND A BIT UNSEASONABLY COOL TODAY WITH LIGHT WIND…

Not much going on today. Today has been another mostly cloudy
day with excellent visibility and a drying air mass. The
dew point started the day in the low 50s during the pre-dawn
hours, dropping through the 40s this morning into the upper
30s this afternoon. This has resulted in the air feeling a
bit chiller than it really is.

Temperatures have been on the cool side only reaching the
low 50s this afternoon. A light north-northwest wind, which
has averaged only around 7 mph since 7 A.M. hasn’t been too
much of a factor in terms of a wind chill today.

The high so far today is 52F, this is 5 degrees below the
daily normal maximum of 57F. The low since midnight is 46F,
which is 7 degrees above the daily normal minimum of 39F.

Today’s Observations:

7 A.M.
Weather: Overcast altostratus, few breaks in overcast
distant SE-S and distant NW-N
Temperature: 47F; Dew Point: 44F; Relative Humidity: 89%
Wind: N at 12G18 kts
Sea-level pressure: 30.15 ins. Hg: rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 51F
6-hr Min temp: 46F
24-hr Precip: 0.01 ins.
BHO SA 1155 E70 OVC 70 209/47/44/3512G18/015/ FEW BINOVC DSNT
SE-S AND DSNT NW-N FEW SC/SCSL ALQDS/ 8/52/ 51016 70001 10051
20046

10 A.M.
Weather: Broken Altostratus, Overcast altocumulus, few breaks
in overcast distant SE-SW and distant NW-NNE
Temperature: 48F; Dew Point: 38F; Relative Humidity: 68%
Wind: NW at 8 kts
Sea-level pressure: 30.12 ins. Hg: fallng, then rising
Visibility: 70 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E90 BKN 120 OVC 70 200/48/38/3308/012/ FEW BINOVC
DSNT SE-SW AND DSNT NW-NNE FEW SC/SCSL ALQDS/ 8/57/ 53009

1 P.M.
Weather: Broken altocumulus, broken cirrus, few stratocumulus
all quadrants
Temperature: 51F; Dew Point: 36F; Relative Humidity: 55%
Wind: NW at 9G16 kts
Sea-level pressure: 30.06 ins. Hg: falling, then more rapidly
Visibility: 70 miles
6-hr Max temp: 52F
6-hr Min temp: 47F
6-hr Precip: 0.00 ins.
BHO SA 1755 E120 BKN 250 BKN 70 179/51/36/3209G16/006/ FEW SC
ALQDS/ 8/551 58021 10052 20047

SUMMARY FOR MONDAY, OCTOBER 26, 2020

TEMPERATURE (DEGREES F)
MAX…..52   NORMAL…..57
MIN…..43   NORMAL…..39
MEAN….48   NORMAL…..48

DEPARTURE FROM 30-YEAR NORMAL…………….  0
TOTAL DEPARTURE FOR THE MONTH…………….+94 [+3.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….17  DEPARTURE…..  0
TOTAL HEATING UNITS FOR THE MONTH…………233  DEPARTURE….-100
TOTAL HEATING UNITS FOR THE SEASON………..331  DEPARTURE….-144
TOTAL HEATING UNITS LAST SEASON TO DATE……386  DEPARTURE…..-55

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……………20 E   AT   5:32 A.M.
AEROVANE (south tower)……18 ESE AT  10:09 A.M.
ASOS……………………20 E   AT   5:33 A.M
DAVIS #1………………..21 E   AT   5:20 A.M
DAVIS #2 (south tower)……22 E   AT  10:09 A.M
VECTOR………………….21
RMY…………………….20
MERLIN………………….19

FASTEST MILE FOR YESTERDAY…………………15 ESE AT  10:10 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………15 ESE AT  10:11 A.M
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…………..16 ESE AT  10:10 A.M
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE…………..16 ESE AT  10:11 A.M
AVERAGE WIND SPEED AND DIRECTION…………. 7.4 ESE  [177 total miles] ASOS…………………. 7.8
DAVIS #1……………… 8.1 ESE [119 deg.] DAVIS #2……………… 7.7 ESE [113 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.01  DEPARTURE….-0.14
ASOS…………..0.01
TOTAL PRECIPITATION FOR THE MONTH……….4.22  DEPARTURE….+0.32
ASOS…………..4.20
TOTAL PRECIPITATION FOR THE YEAR……….38.64  DEPARTURE….-4.34
ASOS………….39.41

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/+9/0.00/591/84             28 SW   AERO 28 SW   RMY N/A
10/02  63/49/56/-1/0.02/203/29             20 NW   AERO 21 NW   RMY 20
10/03  65/45/55/-1/0.00/676/97             19 WNW  AERO 19 WNW  RMY 19
10/04  65/45/55/-1/0.00/659/95             17 ESE  AERO 18 ESE  RMY 18
10/05  62/52/57/+1/0.00/277/40             17 ENE  AERO 17 ENE  RMY N/A
10/06  69/51/60/+5/0.00/503/73             28 S    AERO 28 S    RMY 29
10/07  73/50/62/+7/0.14/316/46             76 W    AERO 74 W    RMY 70  TSTM
10/08  61/42/52/-2/0.00/676/99             41 W    AERO 41 W    RMY N/A
10/09  60/37/49/-5/0.00/646/95             25 SSW  AERO 28 SSW  RMY N/A
10/10  75/52/64/+10/0.00/549/81            40 SSW  AERO 40 SSW  RMY 38
10/11  64/47/56/+3/0.00/574/85             32 NNW  AERO 35 NNW  RMY N/A
10/12  52/48/50/-3/T/000/00                28 E    AERO 27 E    RMY N/A
10/13  57/49/53/0/1.74/000/00              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/+7/1.00/…/..             28 S    AERO 30 S    RMY N/A
10/17  56/39/48/-3/1.24/…/..             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  66/49/58/+8/0.00/…/..             22 S    AERO 22 S    RMY 22
10/21  71/56/64/+14/0.06/…/..            26 SSW  AERO 26 SSW  RMY 26
10/22  70/54/62/+13/0.00/…/..            18 SSW  AERO 17 SSW  RMY N/A
10/23  68/52/60/+11/0.00/…/..            18 ESE  AERO 18 ESE  RMY 18
10/24  68/42/55/+6/0.00/…/..             32 NNW  AERO 32 NNW  RMY 32
10/25  50/40/45/-4/0.00/…/..             19 NNW  AERO 19 NNW  RMY N/A
10/26  52/43/48/0/0.02/…/..              20 E    AERO 18 ESE  RMY 20

10/27 The low since midnight is 46, the daily normal low is 39F

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

RECORDS FOR OCTOBER 27
HIGH 83F IN 1963
LOW 21F IN 1936
PRE 1.79 INCHES IN 1886
SNOW 2.5 INCHES IN 2011
WIND 54 MPH WNW IN 1968

RECORDS FOR OCTOBER 28
HIGH 81F IN 1919
LOW 23F IN 1914
PRECIP 2.46 INCHES IN 2006
SNOWFALL TRACE IN 1934,1957,1979
PEAK GUST 71 MPH SSW IN 1995

TODAY’S REPORT PREPARED BY: Matt Douglas