Saturday, October 9, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SATURDAY, OCTOBER 9, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0550E
SUNSET: 1711E
COOL WITH LIMITED VISIBILITY AND MOSTLY CLOUDY SKIES….
Today was on the cooler side, staying in the low 60’s with a
cool sea breeze from the northeast. Wind is around 10 mph on
average with a max gust around 22 mph.
Visibility was limited to 40 miles at most due to hazy conditions.
Dew points stayed in the low 50’s, and humidity dropped to around
60% by the 1 P.M. observation.
The high so far today is 62F, 2 degrees below the normal max of
64F. The low since midnight is 56F, 9 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: 4.00 inches on the 1st/2nd
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: Broken stratocumulus and cirrocumulus
Temperature: 56F; Dew Point: 51F; Relative Humidity: 64%
Wind: E @ 8G13 kts
Sea-level pressure: 1027.5 mb; 30.34 in. Hg: rising, then rising
more rapidly
Visibility: 25 miles, hazy
6-hr Max temp: 56F
6-hr Min temp: 56F
24-hr Precip: 0.00 ins.
BHO SA 1155 30 BKN 250 BKN 25 275/56/51/0908G13/034/ HAZY/ 8/809
53014 10056 20056
10 A.M.
Weather: Broken stratocumulus
Temperature: 60F; Dew Point: 51F; Relative Humidity: 72%
Wind: E @ 12G17 kts
Sea-level pressure: 1027.9 mb; 30.35 in Hg; rising, then
more slowly
Visibility: 30 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 30 BKN 30 279/60/51/0912G17/035/ 8/800 51004
1 P.M.
Weather: Broken stratocumulus and overcast cirrostratus, break in
overcast overhead
Temperature: 60F, Dew point: 48F; Relative Humidity: 64%
Wind: E @ 9G17 kts
Sea-level pressure: 1027.2 mb; 30.33 in Hg; falling unsteadily
Visibility: 35 miles
6-hr Max temp: 62F
6-hr Min temp: 56F
6-hr Precip: 0.00 ins.
BHO SA 1755 30 BKN 250 OVC 35 272/60/48/0909G17/033/ BINOVC OVHD/
8/806 57007 10062 20056
SUMMARY FOR FRIDAY, OCTOBER 8, 2021
TEMPERATURE (DEGREES F)
MAX…….69 NORMAL…..64
MIN…….55 NORMAL…..47
MEAN……62 NORMAL…..55
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..+7
TOTAL DEPARTURE FOR THE MONTH……………………..+15 [+1.7 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….3 DEPARTURE……..-7
TOTAL HEATING UNITS FOR THE MONTH……………51 DEPARTURE…….-19
TOTAL HEATING UNITS FOR THE SEASON………….125 DEPARTURE…….-62
TOTAL HEATING UNITS LAST SEASON TO DATE……..156 DEPARTURE…….-31
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……..-4
TOTAL COOLING UNITS FOR THE SEASON………….714 DEPARTURE…….+40
TOTAL COOLING UNITS LAST SEASON TO DATE……..831 DEPARTURE……-117
PEAK WIND GUST (MPH):
Official……………….24 ENE @ 6:50 P.M.
AEROVANE (south tower)…..23 ENE @ 6:50 P.M.
VECTOR #2 (south tower)….25 @ 6:50 P.M.
DAVIS #2 (south tower)…..23 E @ 4:24 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…………OUT OF SERVICE D/T RENOVATIONS
MERLIN………OUT OF SERVICE D/T RENOVATIONS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 ENE @ 4:28 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..17 @ 4:25 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 E @ 4:25 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 AVERAGE……..OUT OF SERVICE D/T RENOVATIONS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….. 9.5 NE [229 total miles]
VECTOR #2………………10.4
DAVIS #2……………….10.3 NE
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….+0.75
TOTAL PRECIPITATION FOR THE YEAR………….49.06 DEPARTURE….+9.32
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 73/55/64/+8/0.00/…/.. 15 WSW AERO 15 W RMY N/A
10/08 69/55/62/+7/0.00/…/.. 24 ENE AERO 23 ENE RMY N/A
10/09 The low since midnight is 56F, 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 9
HIGH 82F IN 2011
LOW 29F IN 1907,1937
PRECIP 2.54 INCHES IN 1976
SNOWFALL TRACE IN 1988, 2001
PEAK GUST 81e MPH S IN 1976 (RECORD FOR MONTH)
RECORDS FOR OCTOBER 10
HIGH 85F IN 1949
LOW 27F IN 1929
PRECIP 2.02 INCHES IN 1998
SNOWFALL 6.8 INCHES IN 1979 (RECORD FOR MONTH)
PEAK GUST 59 MPH WNW IN 1958
TODAY’S REPORT PREPARED BY: Benjamin Turner
