Wednesday, October 20, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, OCTOBER 20, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0603E
SUNSET: 1654E
FAIR WEATHER CONTINUES WITH MILDER CONDITIONS….
Despite the cool air mass in place, plenty of sunshine has been
observed today along with dew points in the upper 40’s to low 50’s.
It is less breezy today with a consistent westerly wind a little under
10 mph. There are frequent gusts around 15 mph with a max gust earlier
this morning of 23 mph.
Visibility is decent, holding at around 60-65 miles all day.
The high so far today is 68F, 8 degrees above the normal max
of 60F. The low since midnight is 49F, 7 degrees above the normal
low of 42F.
Today’s Observations:
7 A.M.
Weather: Clear, one distant rogue cumulus cloud off to the NW, few altocumulus
distant NE-SE , few cirrus distant NE-SE
Temperature: 51F; Dew Point: 45F; Relative Humidity: 79%
Wind: W @ 12G20 kts
Sea-level pressure: 1012.2 mb; 29.89 in. Hg: rising, then more slowly
Visibility: 60 miles
6-hr Max temp: 51F
6-hr Min temp: 49F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 60 122/51/45/2712G20/989/ FEW CU DSNT NW FEW AC DSNT NE-SE
FEW CI DSNT NE-SE/ 8/171 51016 10051 20049
10 A.M.
Weather: Clear, few distant cumulus N-NE, few altocumulus S-W , few cirrus
Temperature: 63F; Dew Point: 51F; Relative Humidity: 65%
Wind: W @ 08G15 kts
Sea-level pressure: 1013.2 mb; 29.92 in Hg; rising, then more slowly
Visibility: 60 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 60 132/63/51/2808G15/992/ FEW CU DSNT N-NE FEW AC DSNT S-W
FEW CI ALQDS/ 8/172 51010
1 P.M.
Weather: Clear, few cumulus distant, few altocumulus to the east, few cirrus
Temperature: 68F, Dew point: 53F; Relative Humidity: 58%
Wind: W @ 08G16 kts
Sea-level pressure: 1012.8 mb; 29.91 in Hg; falling, then more slowly then steady
Visibility: 65 miles
6-hr Max temp: 68F
6-hr Min temp: 51F
6-hr Precip: 0.00 ins.
BHO SA 1755 CLR 65 128/68/53/2708G16/991/ FEW DSNT CU ALQDS FEW AC E FEW CI ALQDS/
8/172 56004 10068 20051
SUMMARY FOR TUESDAY, OCTOBER 19, 2021
TEMPERATURE (DEGREES F)
MAX…….59 NORMAL…..60
MIN…….40 NORMAL…..43
MEAN……50 NORMAL…..51
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….. -1
TOTAL DEPARTURE FOR THE MONTH……………………..+90 [+4.5 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY……………15 DEPARTURE……..+1
TOTAL HEATING UNITS FOR THE MONTH…………..109 DEPARTURE…….-93
TOTAL HEATING UNITS FOR THE SEASON………….183 DEPARTURE……-137
TOTAL HEATING UNITS LAST SEASON TO DATE……..268 DEPARTURE…….-85
COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….0 DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH…………….3 DEPARTURE……..-3
TOTAL COOLING UNITS FOR THE SEASON………….717 DEPARTURE…….+40
TOTAL COOLING UNITS LAST SEASON TO DATE……..831 DEPARTURE……-114
PEAK WIND GUST (MPH):
Official……………….35 WNW @ 2:32 P.M.
AEROVANE (south tower)…..37 W @ 1:51 P.M.
VECTOR #2 (south tower)….39 @ 1:54 P.M.
DAVIS #2 (south tower)…..34 WNW @ 2:12 P.M.
RMY #2 (south tower)…….38 W @ 1:54 P.M.
ASOS………..OUT OF SERVICE D/T RENOVATIONS
VECTOR #1……OUT OF SERVICE D/T RENOVATIONS
DAVIS #1…….OUT OF SERVICE D/T RENOVATIONS
RMY #1………OUT OF SERVICE D/T RENOVATIONS
MERLIN………OUT OF SERVICE D/T RENOVATIONS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………26 W @ 1:52 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..27 @ 2:13 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………27 WNW @ 2:13 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..26 WNW @ 2:13 P.M
MAXIMUM 2-MINUTE ASOS AVERAGE…….OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE..OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE RMY #1 AVERAGE…..OUT OF SERVICE D/T RENOVATIONS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..14.3 W [342 total miles]
VECTOR #2………………15.3
DAVIS #2……………….15.3 NWW
RMY #2…………………15.1 WNW
RMY #1…………..OUT OF SERVICE D/T RENOVATIONS
ASOS…………….OUT OF SERVICE D/T RENOVATIONS
VECTOR #1………..OUT OF SERVICE D/T RENOVATIONS
DAVIS #1…………OUT OF SERVICE D/T RENOVATIONS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00 DEPARTURE….-0.18
TOTAL PRECIPITATION FOR THE MONTH………….2.42 DEPARTURE….-0.87
TOTAL PRECIPITATION FOR THE YEAR………….49.40 DEPARTURE….+7.70
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 64/44/54/-4/0.00/583/83 20 WNW AERO 20 WNW RMY N/A
10/02 73/47/60/+2/0.00/567/81 24 WSW AERO 23 WSW RMY N/A
10/03 65/55/60/+3/0.09/070/10 19 E AERO 19 E RMY N/A
10/04 59/51/55/-2/1.69/000/00 30 E AERO 30 E RMY N/A
10/05 58/50/54/-3/0.30/000/00 22 NNE AERO 23 NE RMY N/A
10/06 69/50/60/+4/0.00/407/59 15 N AERO 16 N RMY N/A
10/07 73/55/64/+8/0.00/550/80 15 WSW AERO 15 W RMY N/A
10/08 69/55/62/+7/T/616/90 24 ENE AERO 23 ENE RMY N/A
10/09 62/54/58/+3/0.01/273/40 23 E AERO 23 E RMY N/A
10/10 62/54/58/+3/T/000/00 22 E AERO 21 E RMY N/A
10/11 67/56/62/+8/0.01/…/.. 20 NE AERO 21 NE RMY N/A
10/12 72/54/63/+9/0.00/…/.. 15 SW AERO 15 SW RMY N/A
10/13 75/55/65/+11/0.00/…/.. 18 SW AERO 18 SW RMY N/A
10/14 73/56/65/+12/0.00/…/.. 19 N AERO 20 N RMY N/A
10/15 74/55/67/+14/0.00/…/.. 24 S AERO 24 SSW RMY N/A
10/16 73/59/66/+14/0.06/…/.. 43 S AERO 50 S RMY 44
10/17 62/47/55/+3/0.25/…/.. 32 WNW AERO 31 WNW RMY 31
10/18 60/42/51/-1/0.01/…/.. 31 NW AERO 32 NW RMY 33
10/19 59/40/50/-1/0.00/…/.. 35 WNW AERO 37 W RMY 38
10/20 The low since midnight is 49F, the daily normal low is 42F
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 2.34 INCHES IN 1944
SNOWFALL TRACE IN 1895,1907,1941
PEAK GUST 69e MPH S IN 1976
TODAY’S REPORT PREPARED BY: Augustin Busschaert and Benjamin Turner
