Saturday, October 31, 2020

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

SATURDAY, OCTOBER 31, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

A TRANQUIL DAY ATOP GREAT BOO(!) HILL…

Following yesterday’s record setting snowfall of 6.5 inches,
we have returned the sun and calmer winds to the area. Clear
skies and bright sunshine have been the theme today. Despite
air temperatures reaching the upper-30s (which continues to be
anomalously cold for this time of year) dew points have remained
in the mid-20s allowing shadier spots to retain much of
yesterday’s snowfall. In fact, our snow depth at 1PM was a solid
4 inches. Visibility has been excellent so far today holding right
around 80 miles! Winds have eased from yesterday’s peak of 37 MPH
– only 18 MPH max so far today with an average of about 6 MPH.

While not a new record, today’s low of 24 degrees is good for
3rd lowest minimum temperature in the books for the 31st (records
go back to 1885)! The coldest for this date is 22 degrees set
in 1904…not too far off!

The high so far today is 39F, which is 16 degrees below the
daily normal maximum of 55F. The low since midnight is 24F,
which is 14 degrees below the daily normal minimum of 38F.

Today’s Observations:

7 A.M.
Weather: Clear (few cumulus offshore E to SE)
Temperature: 25F; Dew Point: 22F; Relative Humidity: 89%
Wind: NNW at 10 kts
Sea-level pressure: 30.47 ins. Hg: Rising, then rising more rapidly
Visibility: 80 miles
6-hr Max temp: 26F
6-hr Min temp: 24F
24-hr Precip: 0.62 ins.
24-hr Snow: 6.3 ins.
Storm Total (snow): 6.5 ins
Snow Depth: 6 ins.
BHO SA 1155 CLR 80 317/25/22/3310/047/ FEW CU OFFSHR DSNT E-SE
TOTAL NEW SNW PST 24 HRS 6.3 INS STORM TOTAL 6.5 INS/ 8/100
4/006 53034 70062 10026 20024

10 A.M.
Weather: Clear (few cumulus offshore SE)
Temperature: 31F; Dew Point: 28F; Relative Humidity: 89%
Wind: WNW at 8 kts
Sea-level pressure: 30.55 ins. Hg: rising, then rising more slowly
Visibility: 80 miles (thin smoke layer along horizon)
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins
BHO SA 1455 CLR 80 344/31/28/3008/055/ FEW CU OFFSHR DSNT SE
THN K LYR ALNG HRZN ALQDS/ 8/100 51027

1 P.M.
Weather: Clear
Temperature: 37F; Dew Point: 27F; Relative Humidity: 66%
Wind: W at 8 kts
Sea-level pressure: 30.53 ins. Hg: falling, then falling more rapidly
Visibility: 75 miles
6-hr Max temp: 39F
6-hr Min temp: 25F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 4 ins.
BHO SA 1755 CLR 75 339/37/27/2408/053/ THN K LYR ALNG HRZN NW-E/
8/000 4/004 58005 10039 20025

SUMMARY FOR FRIDAY, OCTOBER 30, 2020

TEMPERATURE (DEGREES F)
MAX…..41   NORMAL…..56
MIN…..26   NORMAL…..38
MEAN….34   NORMAL…..47

DEPARTURE FROM 30-YEAR NORMAL…………….-13
TOTAL DEPARTURE FOR THE MONTH…………….+76 [+2.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….31  DEPARTURE…..+13
TOTAL HEATING UNITS FOR THE MONTH…………321  DEPARTURE…..-82
TOTAL HEATING UNITS FOR THE SEASON………..419  DEPARTURE….-126
TOTAL HEATING UNITS LAST SEASON TO DATE……438  DEPARTURE…..-19

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……………37 NNE AT   1:42 A.M.
AEROVANE (south tower)……44 NNE AT   2:05 A.M.
ASOS……………………38 NNE AT   1:41 A.M
DAVIS #1………………..35 NE  AT   1:41 A.M
DAVIS #2 (south tower)……40 N   AT   2:09 A.M
VECTOR………………….39
RMY…………………….N/A
MERLIN………………….N/A

FASTEST MILE FOR YESTERDAY…………………25 NNE AT  2:05 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………24 NNE AT  2:04 A.M
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…………..24 NNE AT  2:04 A.M
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE…………..23 NNE AT  2:04 A.M
AVERAGE WIND SPEED AND DIRECTION………….13.7 NNW [328 total miles] ASOS………………….13.4
DAVIS #1………………13.3 N   [6 deg.] DAVIS #2………………13.5 N   [7 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.62  DEPARTURE….+0.46
ASOS…………..0.66
TOTAL PRECIPITATION FOR THE MONTH……….6.75  DEPARTURE….+2.22
ASOS…………..6.74
TOTAL PRECIPITATION FOR THE YEAR……….41.17  DEPARTURE….-2.44
ASOS………….41.95

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  52/43/48/0/0.00/…/..              22 NNW  AERO 22 NNW  RMY N/A
10/28  49/42/46/-2/…./…/..             18 W    AERO 18 W    RMY 18
10/29  46/41/44/-3/…/…/..              39 NE   AERO 38 NE   RMY 38
10/30  41/26/34/-13/…/…/..             37 NNE  AERO 44 NNE  RMY N/A

10/31 The low since midnight is 24F, the daily normal low is 38F

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

RECORDS FOR OCTOBER 31
HIGH 79F IN 1946
LOW 22F IN 1904
PRECIP 3.74 INCHES IN 1991
SNOWFALL TRACE IN 1906
PEAK GUST 70e S IN 1945

RECORDS FOR NOVEMBER 1
HIGH 75 IN 2003
LOW 22 IN 1913,1923
PRECIP 2.93 INCHES IN 1985
SNOWFALL TRACE IN 1906,1951
PEAK GUST 78 ESE IN 1997

TODAY’S REPORT PREPARED BY: Andrew Swanson