Thursday, October 7, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY, OCTOBER 7, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0548E
SUNSET: 1715E
ALMOST CLEAR WITH GOOD VISIBILITY FROM THE SUMMIT….
Today consisted of mostly clear skies and a visibility of
75 miles from the summit. Wind continues to be very light,
with an average speed of 5 mph from the northwest.
The high so far today is 73F, 9 degrees above the normal max of
64F. The low since midnight is 55F, 8 degrees above the normal
low of 47F.
PRELIMINARY STATS FOR SEPTEMBER 2021
TEMPERATURE, Deg. F
Avg. Max. 73.2 [+0.5]
Avg. Min. 57.4 [+1.8]
Mean 65.3 [+1.1]
24-hour corrected mean: 64.8
Max. for month: 82F on the 15th
Min. for month: 45F on the 29th
HEATING DEGREE DAYS
Total heating units: 46 [-54]
Total for the season: 74 [-44]
Total for last season: 98
COOLING DEGREE DAYS
Total cooling units: 62 [-12]
Total for the season: 714 [+44]
Total for last season: 830
PRECIPITATION, Inches
Total: 6.64 [+2.58]
Greatest in 24 hrs: N/A
WIND, mph
Avg. uncorrected wind speed: 10.5 mph
Avg. corrected wind speed: 11.0 mph
Prevailing wind direction: NW [11%]
Peak gust and direction: 49 ENE on the 2nd
SUNSHINE:
Campbell-Stokes card minutes: 11490 of a possible 21582, or 53%
Astronomical total minutes: 11965 of a possible 22423, or 53%
Today’s Observations:
7 A.M.
Weather: Clear, few altocumulus
Temperature: 57F; Dew Point: 55F; Relative Humidity: 93%
Wind: NNW @ 6 kts, wind light
Sea-level pressure: 1026.9 mb; 30.32 in. Hg: rising steadily
Visibility: 80 miles
6-hr Max temp: 59F
6-hr Min temp: 55F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 80 269/57/55/3406/032/ FEW AC ALQDS WND LGT/
8/070 51006 10059 20055
10 A.M.
Weather: Clear, few cumulus
Temperature: 67F; Dew Point: 57F; Relative Humidity: 70%
Wind: NNW @ 2 kts, light and variable
Sea-level pressure: 1026.5 mb; 30.31 in Hg; steady then falling
Visibility: 75 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 75 265/67/57/3402/031/ FEW CU ALQDS WND L/V/
8/100 58004
1 P.M.
Weather: Scattered cumulus
Temperature: 73F, Dew point: 57F; Relative Humidity: 58%
Wind: WNW @ 4 kts, wind light and variable
Sea-level pressure: 1024.5 mb; 30.25 in Hg; falling, then more rapidly
Visibility: 75 miles
6-hr Max temp: 73F
6-hr Min temp: 57F
6-hr Precip: 0.00 ins.
BHO SA 1755 40 SCT 75 245/73/57/2904/025/ WND L/V/ 8/100 58020
10073 20057
SUMMARY FOR WEDNESDAY, OCTOBER 6, 2021
TEMPERATURE (DEGREES F)
MAX…….69 NORMAL…..65
MIN…….50 NORMAL…..48
MEAN……60 NORMAL…..56
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………. +4
TOTAL DEPARTURE FOR THE MONTH……………………. 0 [-0.2 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….5 DEPARTURE……..-4
TOTAL HEATING UNITS FOR THE MONTH……………47 DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE SEASON………….121 DEPARTURE…….-47
TOTAL HEATING UNITS LAST SEASON TO DATE……..140 DEPARTURE…….-19
COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….0 DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH…………….0 DEPARTURE……..-3
TOTAL COOLING UNITS FOR THE SEASON………….712 DEPARTURE…….+38
TOTAL COOLING UNITS LAST SEASON TO DATE……..831 DEPARTURE……-119
PEAK WIND GUST (MPH):
Official……………….15 N @ 3:07 A.M.
AEROVANE (south tower)…..16 N @ 2:06 A.M.
VECTOR #2 (south tower)….16 @ 2:22 A.M.
DAVIS #2 (south tower)…..14 NNE @ 2:22 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…………OUT OF SERVICE D/T RENOVATIONS
MERLIN………OUT OF SERVICE D/T RENOVATIONS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………12 N @ 2:22 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..13 @ 2:47 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………12 NNE @ 2:47 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 AVERAGE……..OUT OF SERVICE D/T RENOVATIONS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….. 5.4 N [129 total miles]
VECTOR #2……………… 6.6
DAVIS #2………………. 5.7 NNE
RMY……………..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….-0.17
TOTAL PRECIPITATION FOR THE MONTH………….2.08 DEPARTURE….+1.09
TOTAL PRECIPITATION FOR THE YEAR………….49.06 DEPARTURE….+9.66
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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
09/01 68/56/62/-7/1.47/000/00 34 NNE AERO 37 NNE RMY N/A
09/02 71/55/63/-6/2.53/322/41 49 ENE AERO 52 ENE RMY N/A
09/03 72/52/62/-6/0.00/735/94 23 NW AERO 23 NW RMY N/A
09/04 76/55/66/-2/0.00/757/97 22 WNW AERO 21 WNW RMY N/A
09/05 72/60/66/-2/0.04/008/01 27 S AERO 29 S RMY N/A
09/06 80/61/71/+3/0.00/557/72 24 WNW AERO 25 WNW RMY N/A
09/07 78/57/68/+1/0.00/732/95 23 WSW AERO 22 WSW RMY N/A
09/08 81/61/71/+4/0.00/646/84 43 S AERO 45 S RMY N/A
09/09 71/64/68/+1/0.90/000/00 33 S AERO 36 S RMY N/A
09/10 74/55/65/-1/0.04/595/78 31 NW AERO 32 WNW RMY N/A
09/11 75/51/63/-3/0.00/730/96 24 SW AERO 24 SW RMY N/A
09/12 79/60/70/+4/0.00/591/78 33 SW AERO 32 SW RMY N/A
09/13 77/62/70/+5/0.06/559/74 22 NW AERO 23 NW RMY N/A
09/14 75/59/67/+2/0.00/444/59 23 S AERO 25 S RMY N/A
09/15 82/65/74/+9/T/539/72 32 SSW AERO 35 SSW RMY N/A
09/16 69/61/65/+1/0.27/037/05 24 ENE AERO 24 ENE RMY N/A TSTM
09/17 66/60/63/-1/0.02/000/00 22 NE AERO 23 NE RMY N/A
09/18 74/62/68/+5/0.04/207/28 17 WNW AERO 18 WNW RMY N/A TSTM
09/19 71/57/64/+1/0.15/619/84 23 NNE AERO 24 NNE RMY N/A
09/20 71/55/63/0/0.00/647/88 20 SE AERO 20 SE RMY N/A
09/21 75/55/65/+3/0.00/490/67 19 SSE AERO 20 SSE RMY N/A
09/22 75/65/70/+8/0.02/153/21 30 S AERO 30 S RMY N/A
09/23 78/65/72/+10/0.08/298/41 36 SSE AERO 37 SSE RMY N/A
09/24 75/62/69/+8/0.02/007/01 43 SSE AERO 45 SSE RMY N/A
09/25 74/59/67/+6/0.02/303/42 14 N AERO 14 NNW RMY N/A
09/26 73/54/64/+4/0.57/510/71 33 WNW AERO 32 WNW RMY N/A
09/27 73/52/63/+3/T/529/74 30 SW AERO 30 SW RMY N/A
09/28 67/52/60/+1/0.40/028/04 27 SSW AERO 25 SSW RMY N/A TSTM
09/29 63/45/54/-5/0.00/568/80 25 NNW AERO 25 NNW RMY N/A
09/30 60/46/53/-6/0.01/354/50 22 NNW AERO 21 NNW RMY N/A
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/…/.. 20 WNW AERO 20 WNW RMY N/A
10/02 73/47/60/+2/0.00/…/.. 24 WSW AERO 23 WSW RMY N/A
10/03 65/55/60/+3/0.09/…/.. 19 E AERO 19 E RMY N/A
10/04 59/51/55/-2/1.69/…/.. 30 E AERO 30 E RMY N/A
10/05 58/50/54/-3/0.30/…/.. 22 NNE AERO 23 NE RMY N/A
10/06 69/50/60/+4/…./…/.. 15 N AERO 16 N RMY N/A
10/07 The low since midnight is 55F, the daily normal low is 47F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR OCTOBER 7
HIGH 88F IN 1963 (RECORD FOR MONTH)
LOW 30F IN 1904,1986
PRECIP 1.75 INCHES IN 1972
PEAK GUST 76 W IN 2020
RECORDS FOR OCTOBER 8
HIGH 81F IN 1916,1990
LOW 28F IN 1919
PRECIP 2.22 INCHES IN 1891
SNOWFALL TRACE IN 1988, 2001 (EARLIEST DATE)
PEAK GUST 60 MPH NE IN 1996
TODAY’S REPORT PREPARED BY: Benjamin Turner
