Wednesday, August 11, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, AUGUST 11, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0447E
SUNSET: 1851E
HOT AND HUMID TO THE POINT OF UNFAVORABLE ATOP GREAT BLUE HILL….
Today is very hot and humid with dew points hanging in the low 70’s.
Hiking today is not recommended, and a heat advisory was given
out by the National Weather Service for most of the region until
this Friday. Visibility was limited to around 30 miles for most of
the day, with a max of 45 miles being seen at the 1 P.M. observation.
A very warm southwesterly breeze has been a factor most of the day,
with an average speed around 12 mph and a max gust so far of 25mph.
The high so far today is 87F, 6 degrees above the daily normal
maximum of 81F. The low so far today is 70F, which is 7 degrees
above the daily normal minimum of 63F.
PRELIMINARY STATS FOR JULY 2021
TEMPERATURE, Deg. F
Avg. Max. 76.3 [-5.4]
Avg. Min. 60.4 [-2.5]
Mean 68.8 [-3.9]
24-hour corrected mean: 67.9
Max. for month: 90F on the 16th
Min. for month: 52F on the 31st
HEATING DEGREE DAYS
Total heating units: 28 [+21]
Total for the season: 28 [+21]
Total for last season: 1
COOLING DEGREE DAYS
Total cooling units: 153 [-95]
Total for the season: 379 [-8]
Total for last season: 487
PRECIPITATION, Inches
Total: 11.59 [+8.12]
Greatest in 24 hrs: 3.09 on the 9-10th
WIND, mph
Avg. uncorrected wind speed: 9.0 mph
Avg. corrected wind speed: 9.7 mph
Prevailing wind direction: NE [14%]
Peak gust and direction: 63 NW on the 7th
SUNSHINE:
Campbell-Stokes card minutes: 11574 minutes of a possible 26682 or 43%
Astronomical total minutes: 12005 minutes of a possible 27732 or 43%
Today’s Observations:
7 A.M.
Weather: Sky obscured, vertical visibility 300 ft
Temperature: 72F; Dew Point: 70F; Relative Humidity: 94%
Wind: SSW @ 12G19 kts
Sea-level pressure: 30.04 in. Hg; rising, then more slowly
Visibility: 25 miles, thin fog
6-hr Max temp: 72F
6-hr Min temp: 70F
24-hr Precip: 0.00 ins.
BHO SA 1155 10 SCT 140 BKN 250 BKN 25 174/72/70/2012G19/004/
THN F ALQDS/ 8/759 56001 10072 20070
10 A.M.
Weather: Broken altocumulus and cirrocumulus
Temperature: 83F; Dew Point: 72F; Relative Humidity: 71%
Wind: SW @ 13G19 kts
Sea-level pressure: 30.02 in Hg; falling unsteadily
Visibility: 30 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 140 BKN 250 BKN 30 167/83/72/2213G19/002/ HAZY/
8/059 56007
1 P.M.
Weather: Scattered cumulus, broken altocumulus and cirrus
Temperature: 85F, Dew point: 72F; Relative Humidity: 66%
Wind: SSW @ 14G22
Sea-level pressure: 29.99 in Hg; falling steadily
Visibility: 45 miles
6-hr Max temp: 87F
6-hr Min temp: 72F
6-hr Precip: 0.00 ins.
BHO SA 1755 40 SCT 140 BKN 250 BKN 45 156/85/72/2014G22/999/ 8/151
58011 10087 20072
SUMMARY FOR TUESDAY, AUGUST 10, 2021
TEMPERATURE (DEGREES F)
MAX…….78 NORMAL…..81
MIN…….63 NORMAL…..63
MEAN……71 NORMAL…..72
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………..-1
TOTAL DEPARTURE FOR THE MONTH………………….-22 [-2.4 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH…………….0 DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE SEASON…………..28 DEPARTURE…….+19
TOTAL HEATING UNITS LAST SEASON TO DATE……….1 DEPARTURE…….+27
COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….6 DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH……………55 DEPARTURE…….-23
TOTAL COOLING UNITS FOR THE SEASON………….434 DEPARTURE…….-30
TOTAL COOLING UNITS LAST SEASON TO DATE……..611 DEPARTURE……-177
PEAK WIND GUST (MPH):
Official……………….19 S @ 11:59 P.M.
AEROVANE (south tower)…..20 S @ 11:41 P.M.
VECTOR #2 (south tower)….20 @ 11:59 P.M.
DAVIS #2 (south tower)…..21 S @ 10:36 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………………14 S @ 11:42 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15 @ 10:04 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 S @ 11:59 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…… 6.8 S [162 total miles]
VECTOR #2……………. 7.5
DAVIS #2…………….. 7.0 S
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….-0.13
TOTAL PRECIPITATION FOR THE MONTH………….2.76 DEPARTURE….+1.44
TOTAL PRECIPITATION FOR THE YEAR………….37.73 DEPARTURE….+5.97
PRELIMINARY CLIMATE SUMMARY FOR JULY 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
07/01 80/65/73/+2/0.74/155/17 22 W AERO 20 WSW RMY 21
07/02 65/55/60/-11/1.49/000/00 37 NE AERO 36 NE RMY 39
07/03 56/54/55/-17/1.98/000/00 41 NE AERO 44 NE RMY 45 TSTM
07/04 66/54/60/-12/0.16/191/21 26 ENE AERO 23 ENE RMY 26
07/05 74/53/64/-8/0.01/546/60 26 SSW AERO 28 SSW RMY 27
07/06 87/66/77/+5/0.26/255/28 37 W AERO 48 W RMY 38 TSTM
07/07 88/88/77/+5/0.77/699/77 63 NW AERO 75 NW RMY 70 TSTM
07/08 67/59/63/-9/0.38/109/12 46 W AERO 46 W RMY 51 TSTM
07/09 73/62/68/-5/3.02/163/18 40 WNW AERO 44 WNW RMY 43
07/10 71/63/67/-6/0.07/109/12 23 NE AERO 21 NNE RMY 22
07/11 81/61/71/-2/T/325/36 21 SW AERO 19 S RMY N/A
07/12 67/61/64/-9/1.01/000/00 31 ENE AERO 31 ENE RMY N/A
07/13 66/60/63/-10/0.02/000/00 19 E AERO 18 E RMY N/A
07/14 80/62/71/-2/0.01/216/24 19 S AERO 18 S RMY N/A
07/15 88/67/78/+5/0.00/844/94 19 WSW AERO 18 SSW RMY N/A
07/16 90/70/80/+7/0.04/609/68 36 NNW AERO 39 NNW RMY N/A TSTM
07/17 78/64/71/-2/0.34/394/44 26 ENE AERO 25 ENE RMY N/A TSTM
07/18 74/63/69/-4/0.15/000/00 22 NE AERO 22 NE RMY N/A TSTM
07/19 71/63/67/-6/0.07/027/03 17 ENE AERO 17 ENE RMY N/A
07/20 83/64/74/+1/0.00/730/82 23 NW AERO 23 NW RMY N/A
07/21 79/62/71/-2/0.16/577/65 26 NNW AERO 23 NNW RMY N/A TSTM
07/22 79/58/69/-4/T/656/74 20 WNW AERO 20 WNW RMY N/A
07/23 79/62/71/-2/0.00/708/80 22 S AERO 21 S RMY N/A TSTM
07/24 78/59/69/-4/0.00/830/94 19 S AERO 18 S RMY N/A
07/25 71/64/68/-5/0.08/009/01 40 SSW AERO 41 SSW RMY N/A
07/26 87/67/77/+4/0.01/765/87 27 WSW AERO 25 WNW RMY N/A
07/27 87/65/76/+3/0.56/754/86 55 NW AERO 58 NW RMY N/A TSTM
07/28 72/61/67/-6/0.06/446/51 18 NNE AERO 18 NNE RMY N/A
07/29 77/61/69/-4/0.19/323/37 39 S AERO 40 S RMY N/A
07/30 78/58/68/-5/0.01/714/82 31 NW AERO 31 NW RMY N/A
07/31 74/52/63/-10/0.00/851/98 24 WNW AERO 25 WNW RMY N/A
RECORDS FOR JULY:
JULY 2: Record daily precipitation of 1.49″,
Surpasses previous record of 1.42″ set in 1986
JULY 3: Record daily precipitation of 1.98″,
Surpasses previous record of 1.36″ set in 1985
JULY 7: Record peak gust of 63 MPH,
Surpasses previous record of 55 MPH set in 1989
JULY 2021: New record for number of days with measurable precipitation
with 24 days. Beating the previous record of 20 in 1906
This is also the record for ANY month, beating the previous
record of 22 in December 1972
PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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
08/01 77/58/68/-5/T/…/.. 23 SSW AERO 24 SSW RMY N/A
08/02 78/61/70/-3/T/…/.. 28 WNW AERO 28 WNW RMY N/A
08/03 76/60/68/-5/0.00/…/.. 15 N AERO 16 N RMY N/A
08/04 75/61/68/-5/0.71/…/.. 21 ESE AERO 21 ESE RMY N/A
08/05 68/61/65/-8/1.68/…/.. 28 NE AERO 28 NE RMY N/A
08/06 85/62/74/+1/0.00/…/.. 19 S AERO 20 WSW RMY N/A
08/07 88/66/77/+4/0.00/…/.. 23 SW AERO 23 SW RMY N/A
08/08 80/67/74/+2/T/…/.. 16 SW AERO 16 WNW RMY N/A
08/09 75/64/70/-2/0.25/…/.. 22 ENE AERO 21 NE RMY N/A
08/10 78/63/71/-1/…./…/.. 19 S AERO 20 S RMY N/A
08/11 The low since midnight is 70F, the daily normal low is 63F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR AUGUST 11
HIGH 97F IN 1944
LOW 49F IN 1972
PRECIP 3.13 INCHES IN 1990
PEAK GUST 44 MPH SW IN 1971
RECORDS FOR AUGUST 12
HIGH 99F IN 1944
LOW 48F IN 1930
PRECIP 1.89 INCHES IN 1979
PEAK GUST 50 MPH NE IN 1983
TODAY’S REPORT PREPARED BY: Benjamin Turner
