Monday, August 9, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
MONDAY, AUGUST 9, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0445E
SUNSET: 1853E
EVEN COOLER TODAY, BUT STILL HUMID UNDER MAINLY CLOUDY SKIES….
Overcast skies along with an onshore flow off the ocean is really
keeping temperatures on the cool side today. We did manage to
get to the mid 70s late this morning when a break in the clouds
allowed for some brief sun, however temperatures have dropped
back into the low 70s as the clouds closed the gap and blocked
the sun once again.
A brief rain shower moved through during mid morning, but again,
only amounted to a trace. Interestingly, in the first 9 days of
the month, 6 days has had at least a trace of rain. While we’re
not seeing nearly the measured amounts we saw in July, the
overall theme of frequent rain days seems to be continuing so far.
The dew point continues on the high side with readings in the
mid to upper 60s, but with the nice breeze it doesn’t feel too
bad.
A northeast to east-northeasterly wind has been the theme all day,
at times gusting over 20 mph, however for the most part the wind
has been on the lighter side, averaging between 5-10 mph most of
the day.
Visibility has been quite limited. It was only 1/8th of a mile
early this morning in fog, and has only recovered to around 15
miles early this afternoon with hazy air.
The high so far today is 75F, 6 degrees below the daily normal
maximum of 81F. The low so far today is 66F, which is 2 degrees
above the daily normal minimum of 64F.
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: N/A
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 100 ft
Temperature: 66F; Dew Point: 66F; Relative Humidity: 100%
Wind: NNE @ 5kts, wind light
Sea-level pressure: 30.19 in. Hg; rising, then more rapidly
Visibility: 1/8 mile, fog
6-hr Max temp: 67F
6-hr Min temp: 66F
24-hr Precip: Trace
BHO SA 1155 X W1 1/8F 224/66/66/0305/019/ WND LGT/ 8//// 53009
70000 10067 20066
10 A.M.
Weather: Broken stratus fractus, overcast stratus
Temperature: 68F; Dew Point: 66F; Relative Humidity: 93%
Wind: NE @ 9 kts
Sea-level pressure: 30.21 in Hg; rising, then falling
Visibility: 8 miles, thin fog
3-hr Precip: Trace
BHO SA 1455 E5 BKN 13 OVC 8 229/68/66/0509/021/ THN F ALQDS/
8/6// 50005 6000/
1 P.M.
Weather: Scattered stratus fractus, broken stratocumulus, overcast altocumulus,
few breaks in overcast all quadrants, higher clouds visible
Temperature: 72F, Dew point: 65F; Relative Humidity: 79%
Wind: ENE @ 7 kts
Sea-level pressure: 30.18 in Hg; falling, then more rapidly
Visibility: 15 miles, hazy
6-hr Max temp: 75F
6-hr Min temp: 66F
6-hr Precip: Trace
BHO SA 1755 8 SCT E30 BKN 65 OVC 15 221/72/65/0607/018/
FEW BINOVC ALQDS HIER CLDS VSBL HAZY/ 8/65/ 58008 6000/ 10075 20066
SUMMARY FOR SUNDAY, AUGUST 8, 2021
TEMPERATURE (DEGREES F)
MAX…….80 NORMAL…..81
MIN…….67 NORMAL…..64
MEAN……74 NORMAL…..72
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………..+2
TOTAL DEPARTURE FOR THE MONTH………………….-19 [-2.6 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…………….9 DEPARTURE……..+1
TOTAL COOLING UNITS FOR THE MONTH……………44 DEPARTURE…….-19
TOTAL COOLING UNITS FOR THE SEASON………….423 DEPARTURE…….-26
TOTAL COOLING UNITS LAST SEASON TO DATE……..581 DEPARTURE……-158
PEAK WIND GUST (MPH):
Official……………….16 SW @ 12:58 A.M.
AEROVANE (south tower)…..16 WNW @ 8:13 A.M.
VECTOR #2 (south tower)….17 @ 12:57 A.M.
DAVIS #2 (south tower)…..16 WSW @ 12:15 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…………OUT OF SERVICE D/T RENOVATIONS
MERLIN………OUT OF SERVICE D/T RENOVATIONS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………12 SW @ 12:24 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..13 @ 8:04 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………13 WSW @ 1:47 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…… 6.3 WSW [152 total miles]
VECTOR #2……………. 7.3
DAVIS #2…………….. 7.1 W
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……TRACE DEPARTURE….-0.13
TOTAL PRECIPITATION FOR THE MONTH………….2.39 DEPARTURE….+1.33
TOTAL PRECIPITATION FOR THE YEAR………….37.36 DEPARTURE….+5.86
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
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 The low since midnight is 66F, the daily normal low is 64F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR AUGUST 9
HIGH 100F IN 1949
LOW 49F IN 1899
PRE 2.65 INS IN 1976
PEAK GUST 90 MPH SW IN 1968
RECORDS FOR AUGUST 10
HIGH 101F IN 1949 [STATION RECORD MAXIMUM – Tied with 8/2/1975]
LOW 49F IN 1964
PRE 2.27 INS IN 1952
PEAK GUST 88e MPH S IN 1976
TODAY’S REPORT PREPARED BY: Matt Douglas
