Thursday, October 21, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY, OCTOBER 21, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0604E
SUNSET: 1656E
WARMER WITH PARTLY CLOUDY SKIES AND A SOUTHWESTERLY BREEZE….
Today was warmer, yet dry with dew points staying in the upper
40’s. Cloud cover decreased as the day went on, and visibility
was an average of 50 miles.
Temperatures today are normal for mid to late September!
The high so far today is 74F, 14 degrees above the normal max
of 60F. The low since midnight is 56F, 14 degrees above the
normal low of 42F.
Today’s Observations:
7 A.M.
Weather: Scattered altocumulus and broken cirrostratus
Temperature: 58F; Dew Point: 46F; Relative Humidity: 63%
Wind: W @ 9G14 kts
Sea-level pressure: 1016.0 mb; 30.00 in. Hg: rising, then more rapidly
Visibility: 50 miles
6-hr Max temp: 61F
6-hr Min temp: 56F
24-hr Precip: 0.00 ins.
BHO SA 1155 110 SCT 250 BKN 50 160/58/46/2709G14/000/ 8/076 53006 10061
20056
10 A.M.
Weather: Broken altocumulus and cirrus
Temperature: 68F; Dew Point: 51F; Relative Humidity: 55%
Wind: SW @ 5 kts, wind light
Sea-level pressure: 1016.0 mb; 30.00 in Hg; rising then falling
Visibility: 40 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 110 BKN 250 BKN 40 160/68/51/2405/000/ WND LGT/ 8/071 55000
1 P.M.
Weather: Scattered cirrus, few altocumulus
Temperature: 73F, Dew point: 49F; Relative Humidity: 43%
Wind: SSW @ 11G19 kts
Sea-level pressure: 1013.7 mb; 29.93 in Hg; falling unsteadily
Visibility: 55 miles
6-hr Max temp: 74F
6-hr Min temp: 58F
6-hr Precip: 0.00 ins.
BHO SA 1755 250 SCT 55 137/73/49/2211G19/993/ FEW AC ALQDS/ 8/051 57023 10074 20058
SUMMARY FOR WEDNESDAY, OCTOBER 20, 2021
TEMPERATURE (DEGREES F)
MAX…….70 NORMAL…..60
MIN…….49 NORMAL…..42
MEAN……60 NORMAL…..51
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….. +9
TOTAL DEPARTURE FOR THE MONTH……………………..+99 [+4.8 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….5 DEPARTURE……..-9
TOTAL HEATING UNITS FOR THE MONTH…………..114 DEPARTURE……-102
TOTAL HEATING UNITS FOR THE SEASON………….188 DEPARTURE……-146
TOTAL HEATING UNITS LAST SEASON TO DATE……..275 DEPARTURE…….-87
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……………….23 W @ 7:35 A.M.
AEROVANE (south tower)…..23 W @ 7:36 A.M.
VECTOR #2 (south tower)….25 @ 7:35 A.M.
DAVIS #2 (south tower)…..24 W @ 2:15 A.M.
RMY #2 (south tower)…….25 W @ 2:15 A.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………………17 W @ 2:10 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..17 @ 6:56 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 W @ 2:15 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..18 W @ 2:15 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……..10.6 W [254 total miles]
VECTOR #2………………11.5
DAVIS #2……………….11.5 W
RMY #2…………………11.4 W
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….-1.06
TOTAL PRECIPITATION FOR THE YEAR………….49.40 DEPARTURE….+7.51
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 70/49/60/+9/0.00/…/.. 23 W AERO 23 W RMY 23
10/21 The low since midnight is 56F, 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 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
RECORDS FOR OCTOBER 22
HIGH 85F IN 1979
LOW 23F IN 1940
PRECIP 2.38 INCHES IN 2014
SNOWFALL TRACE IN 1969, 2010
PEAK GUST 67 MPH ESE IN 1988
TODAY’S REPORT PREPARED BY: Benjamin Turner
