Tuesday, October 19, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
TUESDAY, OCTOBER 19, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0602E
SUNSET: 1655E
FAIR WEATHER CONTINUES WITH COOL AND BREEZY CONDITIONS….
We recorded our lowest temperature of the season thus far this
morning with a low of 40F (39.7F). This is the coldest temperature
recorded since back on May 8th when we also had a low of 40F
(39.8F)!
Despite the cool air mass in place, plenty of sunshine has been
observed today along with rather dry air. The dewpoint has been
holding in the mid 30s all day. Combined with the breeze, there
is definitely a chill in the air.
Speaking of breeziness, a busy west-northwest wind has been
blowing once again today averaging around 15 mph! The peak gust
thus far for today is 35 mph.
Visibility has been excellent, holding at around 80 miles all day.
The high so far today is 58F, 2 degrees below the normal max
of 60F. The low since midnight is 40F, 3 degrees below the normal
low of 43F.
Today’s Observations:
7 A.M.
Weather: Clear, few stratocumulus distant all quadrants, few altocumulus
distant WNW-N-ENE, few cirrus distant NNW-N
Temperature: 41F; Dew Point: 36F; Relative Humidity: 82%
Wind: W @ 12G17 kts
Sea-level pressure: 1011.9 mb; 29.88 in. Hg: rising, then more rapidly
Visibility: 80 miles
6-hr Max temp: 42F
6-hr Min temp: 40F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 80 119/41/36/2712G17/988/ FEW SC DSNT ALQDS
FEW AC DSNT WNW-N-ENE FEW CI DSNT NNW-N/ 8/571 53006 10042 20040
10 A.M.
Weather: Clear, few stratocumulus all quadrants, few altocumulus NNW-E
Temperature: 51F; Dew Point: 36F; Relative Humidity: 55%
Wind: WNW @ 13G21 kts
Sea-level pressure: 1011.3 mb; 29.86 in Hg; rising, then falling
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 80 113/51/36/2913G21/986/ FEW SC ALQDS FEW AC NNW-E/ 8/570 58006
1 P.M.
Weather: Clear, few stratocumulus distant NW-NE-SE, few altocumulus
distant all quadrants
Temperature: 57F, Dew point: 36F; Relative Humidity: 46%
Wind: WNW @ 14G21 kts, peak wind WNW 35 mph at 12:24 P.M.
Sea-level pressure: 1009.1 mb; 29.80 in Hg; falling, then more rapidly
Visibility: 80 miles
6-hr Max temp: 58F
6-hr Min temp: 41F
6-hr Precip: 0.00 ins.
BHO SA 1755 CLR 80 091/57/36/2914G21/980/ FEW SC DSNT NW-NE-SE
FEW AC DSNT ALQDS PK WND 2930/24/ 8/570 58022 10058 20041
SUMMARY FOR MONDAY, OCTOBER 18, 2021
TEMPERATURE (DEGREES F)
MAX…….60 NORMAL…..60
MIN…….42 NORMAL…..43
MEAN……51 NORMAL…..52
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….. -1
TOTAL DEPARTURE FOR THE MONTH……………………..+91 [+4.9 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY……………14 DEPARTURE……..+1
TOTAL HEATING UNITS FOR THE MONTH……………94 DEPARTURE…….-94
TOTAL HEATING UNITS FOR THE SEASON………….168 DEPARTURE……-138
TOTAL HEATING UNITS LAST SEASON TO DATE……..257 DEPARTURE…….-89
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……………….31 NW @ 5:48 P.M.
AEROVANE (south tower)…..32 NW @ 5:58 P.M.
VECTOR #2 (south tower)….34 @ 5:48 P.M.
DAVIS #2 (south tower)…..28 WNW @ 11:11 A.M.
RMY #2 (south tower)…….33 NW @ 5:58 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………………22 WNW @ 12:15 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..22 @ 11:13 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 NW @ 12:13 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..22 NW @ 11:14 A.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……..12.8 WNW [308 total miles]
VECTOR #2………………13.5
DAVIS #2……………….13.3 NW
RMY #2…………………13.2 NW
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….-0.19
TOTAL PRECIPITATION FOR THE MONTH………….2.42 DEPARTURE….-0.69
TOTAL PRECIPITATION FOR THE YEAR………….49.40 DEPARTURE….+7.88
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 The low since midnight is 40F, the daily normal low is 43F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR OCTOBER 19
HIGH 81F IN 1945
LOW 21F IN 1922
PRECIP 3.64 INCHES IN 1932
SNOWFALL 1.0 INCHES IN 1972
PEAK GUST 66 MPH SSW IN 1967
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
TODAY’S REPORT PREPARED BY: Matt Douglas
