Wednesday, September 15, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, SEPTEMBER 15, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0525E
SUNSET: 1754E
BREEZY WITH HAZE AND SMOKE ALOFT ATOP GREAT BLUE HILL….
Despite morning fog and hazy conditions for the rest of the
day, we were able to see 40 miles at the 1 P.M. observation.
Skies were mostly cloudy, consisting of stratocumulus clouds
and smoke from the wildfires out west.
Wind was an interesting feature, being almost 20 mph on average
from the south. The peak gust so far today is 32 mph.
It’s quite the warm breeze… Dew points are in the low to mid
70’s. It’s reminiscent of a late summer day and very uncomfortable
hiking weather.
There is some fall color starting to show up in the Neponset
River valley.
The high so far today is 83F, this is 10 degrees above the
daily normal maximum of 73F. The low so far today is 63F,
which is 7 degrees above the daily normal minimum of 56F.
PRELIMINARY STATS FOR AUGUST 2021
TEMPERATURE, Deg. F
Avg. Max. 81.6 [+1.4]
Avg. Min. 65.4 [+2.8]
Mean 73.5 [+2.1]
24-hour corrected mean: 72.6
Max. for month: 92F on the 13th
Min. for month: 58F on the 1st
HEATING DEGREE DAYS
Total heating units: 0 [-11]
Total for the season: 28 [+25]
Total for last season: 3
COOLING DEGREE DAYS
Total cooling units: 271 [+62]
Total for the season: 650 [+54]
Total for last season: 757
PRECIPITATION, Inches
Total: 5.37 [+1.46]
Greatest in 24 hrs: 2.38 ins. on the 4th-5th
WIND, mph
Avg. uncorrected wind speed: 8.8 mph
Avg. corrected wind speed: 9.5 mph
Prevailing wind direction: SSW [14%]
Peak gust and direction: 47 ESE on the 22nd
SUNSHINE:
Campbell-Stokes card minutes: 12612 minutes of a possible 24780, or 51%
Astronomical total minutes: 13116 minutes of a possible 25728, or 51%
Today’s Observations:
7 A.M.
Weather: Broken stratocumulus, smoke layer aloft
Temperature: 70F; Dew Point: 70F; Relative Humidity: 100%
Wind: S @ 15G22 kts
Sea-level pressure: 1016.3 mb; 30.01 in. Hg; rising then falling
Visibility: 3 miles, fog
6-hr Max temp: 70F
6-hr Min temp: 63F
24-hr Precip: 0.00 ins.
BHO SA 1155 10 BKN 3F 163/70/70/1815G22/001/ K LYR ALF SUN DMLY VSBL/
8/607 58001 10070 20063
10 A.M.
Weather: Broken stratocumulus, smoke layer aloft
Temperature: 77F; Dew Point: 70F; Relative Humidity: 78%
Wind: ESE @ 19G23 kts
Sea-level pressure: 1015.8 mb; 30.00 in Hg; falling, then more rapidly
Visibility: 35 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 19 BKN 35 158/77/70/2019G23/000/ K LYR ALF HAZY/ 8/800
58005
1 P.M.
Weather: Scattered stratocumulus
Temperature: 82F, Dew point: 72F; Relative Humidity: 73%
Wind: S @ 21G28 kts, peak of 32 mph at 12:43 P.M.
Sea-level pressure: 1014.2 mb; 29.95 in Hg; falling, then more rapidly
Visibility: 40 miles, smoke layer aloft
6-hr Max temp: 83F
6-hr Min temp: 70F
6-hr Precip: 0.00 ins.
BHO SA 1755 27 SCT 40 142/82/72/1921G28/995/ K LYR ALF PK WND 1928/43/
8/800 58016 10083 20070
SUMMARY FOR TUESDAY, SEPTEMBER 14, 2021
TEMPERATURE (DEGREES F)
MAX…….75 NORMAL…..74
MIN…….59 NORMAL…..56
MEAN……67 NORMAL…..65
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….+2
TOTAL DEPARTURE FOR THE MONTH…………………….-7 [-0.7 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE MONTH……………10 DEPARTURE…….-13
TOTAL HEATING UNITS FOR THE SEASON…………..38 DEPARTURE……..-3
TOTAL HEATING UNITS LAST SEASON TO DATE………14 DEPARTURE…….+24
COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….2 DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH……………32 DEPARTURE…….-19
TOTAL COOLING UNITS FOR THE SEASON………….682 DEPARTURE…….+35
TOTAL COOLING UNITS LAST SEASON TO DATE……..805 DEPARTURE……-123
PEAK WIND GUST (MPH):
Official……………….23 S @ 11:39 P.M.
AEROVANE (south tower)…..23 S @ 11:42 P.M.
VECTOR #2 (south tower)….25 @ 11:53 P.M.
DAVIS #2 (south tower)…..28 S @ 11:37 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………………19 S @ 10:58 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..20 @ 11:37 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 S @ 11:39 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
*LAST OF TWO OCCURRENCES
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..9.0 S [216 total miles]
VECTOR #2………………9.8
DAVIS #2……………….9.8 SSE
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………….5.04 DEPARTURE….+3.34
TOTAL PRECIPITATION FOR THE YEAR………….45.38 DEPARTURE….+9.33
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/589/68 23 SSW AERO 24 SSW RMY N/A
08/02 78/61/70/-3/T/821/95 28 WNW AERO 28 WNW RMY N/A
08/03 76/60/68/-5/0.00/302/35 15 N AERO 16 N RMY N/A
08/04 75/61/68/-5/0.71/077/09 21 ESE AERO 21 ESE RMY N/A
08/05 68/61/65/-8/1.68/000/00 28 NE AERO 28 NE RMY N/A
08/06 85/62/74/+1/0.00/727/85 19 S AERO 20 WSW RMY N/A
08/07 88/66/77/+4/0.00/520/61 23 SW AERO 23 SW RMY N/A
08/08 80/67/74/+2/T/128/15 16 SW AERO 16 WNW RMY N/A
08/09 75/64/70/-2/0.25/076/09 22 ENE AERO 21 NE RMY N/A
08/10 78/63/71/-1/0.12/203/24 19 S AERO 20 S RMY N/A
08/11 89/70/80/+8/0.00/667/79 29 SSW AERO 28 SSW RMY N/A
08/12 91/71/81/+9/T/580/69 36 WSW AERO 37 WSW RMY N/A TSTM
08/13 92/73/83/+11/0.00/696/83 18 WSW AERO 18 WSW RMY N/A
08/14 87/69/78/+6/T/601/72 25 W AERO 25 NNW RMY N/A
08/15 80/62/71/-1/0.00/800/96 19 NNW AERO 20 NNW RMY N/A
08/16 78/59/69/-3/0.00/564/68 15 S AERO 15 S RMY N/A
08/17 82/63/73/1/0.00/555/67 22 SSW AERO 23 SSW RMY N/A
08/18 86/66/76/+5/0.00/338/41 21 SSW AERO 22 SSW RMY N/A
08/19 81/69/75/+4/0.62/222/27 41 S AERO 43 S RMY N/A
08/20 78/70/74/+3/0.01/066/08 21 WSW AERO N/A RMY N/A
08/21 86/69/78/+7/0.00/581/71 17 S AERO 17 S RMY N/A
08/22 74/66/70/-1/0.78/000/00 47 ESE AERO 48 ESE RMY N/A
08/23 83/68/76/+5/1.17/333/41 25 SSE AERO 26 SSE RMY N/A TSTM
08/24 86/67/77/+6/0.01/567/70 21 NNW AERO 21 NNW RMY N/A
08/25 89/70/80/+10/0.00/783/97 17 SW AERO 18 SW RMY N/A
08/26 92/72/82/+12/0.00/765/95 19 WSW AERO 18 WSW RMY N/A
08/27 89/70/80/+10/T/626/78 30 ENE AERO 30 ENE RMY N/A
08/28 70/59/65/-5/0.02/296/37 34 ENE AERO 34 ENE RMY N/A
08/29 72/59/66/-4/T/016/02 20 S AERO 21 S RMY N/A
08/30 84/67/76/+7/0.00/246/31 25 SW AERO 26 SW RMY N/A
08/31 80/65/73/+4/0.00/371/47 27 WNW AERO 28 WNW RMY N/A
RECORDS FOR THE MONTH
08/22 NEW PEAK GUST RECORD OF 47 MPH,
BEATING THE OLD RECORD OF 44 MPH IN 1987
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/…/.. 24 WNW AERO 25 WNW RMY N/A
09/07 78/57/68/+1/0.00/…/.. 23 WSW AERO 22 WSW RMY N/A
09/08 81/61/71/+4/0.00/…/.. 43 S AERO 45 S RMY N/A
09/09 71/64/68/+1/0.90/…/.. 33 S AERO 36 S RMY N/A
09/10 74/55/65/-1/0.04/…/.. 31 NW AERO 32 WNW RMY N/A
09/11 75/51/63/-3/0.00/…/.. 24 SW AERO 24 SW RMY N/A
09/12 79/60/70/+4/0.00/…/.. 33 SW AERO 32 SW RMY N/A
09/13 77/62/70/+5/0.06/…/.. 22 NW AERO 23 NW RMY N/A
09/14 75/59/67/+2/0.00/…/.. 23 S AERO 25 S RMY N/A
09/15 The low since midnight is 69F, the daily normal low is 56F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR SEPTEMBER 15
HIGH 89F IN 1931
LOW 35F IN 1913
PRECIP 3.93 INCHES IN 1904 (Extra-tropical storm making landfall in New England on 9/15/1904 passing east of BHO and bringing a storm total of 4.11 inches 9/14-15/1904)
PEAK GUST 65e MPH NW IN 1944 (In the wake of Great Atlantic Hurricane)
RECORDS FOR SEPTEMBER 16
HIGH 91F IN 1939,1941
LOW 39F IN 1984
PRECIP 5.12 INCHES IN 1933 (Hurricane)
PEAK GUST 59 MPH SSE IN 1999
TODAY’S REPORT PREPARED BY: Benjamin Turner and Augustin Busschaert
