Tuesday, September 14, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
TUESDAY, SEPTEMBER 14, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0523E
SUNSET: 1755E
PARTLY CLOUDY UNTIL NOONTIME WITH GOOD VISIBILITY….
We observed a visibility of 75 miles all day, and partly cloudy
skies until noontime. Cloud cover has increased since then with
a slight drop in pressure. Wind was southeasterly this morning,
but shifted to the southwest. Wind is light with a max gust of
only 15 mph.
There is some fall color starting to show up in the Neponset
River valley.
The high so far today is 75F, this is a degree above the
daily normal maximum of 74F. The low so far today is 59F,
which is 3 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: Scattered cirrus, few cumulus
Temperature: 64F; Dew Point: 56F; Relative Humidity: 76%
Wind: ESE @ 4 kts, light and variable
Sea-level pressure: 1020.2 mb; 30.13 in. Hg; rising then more rapidly
Visibility: 75 miles
6-hr Max temp: 64F
6-hr Min temp: 59F
24-hr Precip: 0.00 ins.
BHO SA 1155 250 -SCT 75 202/64/56/1104/013/ FEW CU THN K LYR ALQDS
WND L/V/ 8/101 53011 10064 20059
10 A.M.
Weather: Scattered cirrus, few cumulus
Temperature: 69F; Dew Point: 53F; Relative Humidity: 56%
Wind: ESE @ 7 kts
Sea-level pressure: 1020.9 mb; 30.15 in Hg; rising unsteadily
Visibility: 75 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 250 -SCT 75 209/69/53/1107/015/ FEW CU ALQDS/ 8/101
52007
1 P.M.
Weather: Broken stratocumulus and thin cirrus
Temperature: 73F, Dew point: 54F; Relative Humidity: 52%
Wind: SSW @ 8 kts
Sea-level pressure: 1019.5 mb; 30.11 in Hg; falling, then more rapdidly
Visibility: 75 miles
6-hr Max temp: 75F
6-hr Min temp: 64F
6-hr Precip: 0.00 ins.
BHO SA 1755 50 BKN 250 -BKN 75 195/73/54/2008/011/ 8/801 58014
10075 20064
SUMMARY FOR MONDAY, SEPTEMBER 13, 2021
TEMPERATURE (DEGREES F)
MAX…….77 NORMAL…..74
MIN…….62 NORMAL…..57
MEAN……70 NORMAL…..65
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….+5
TOTAL DEPARTURE FOR THE MONTH…………………….-9 [-0.9 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…….-10
TOTAL HEATING UNITS FOR THE SEASON…………..38 DEPARTURE………0
TOTAL HEATING UNITS LAST SEASON TO DATE………10 DEPARTURE…….+27
COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….5 DEPARTURE……..+2
TOTAL COOLING UNITS FOR THE MONTH……………30 DEPARTURE…….-18
TOTAL COOLING UNITS FOR THE SEASON………….680 DEPARTURE…….+36
TOTAL COOLING UNITS LAST SEASON TO DATE……..805 DEPARTURE……-125
PEAK WIND GUST (MPH):
Official……………….22 NW @ 6:31 A.M.
AEROVANE (south tower)…..23 NW @ 6:29 A.M.
VECTOR #2 (south tower)….24 @ 6:31 A.M.
DAVIS #2 (south tower)…..21 NW @ 6:29 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………………16 NW @ 6:33 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16 @ 1:53 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 NW @ 1:53 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……..9.3 NW [223 total miles]
VECTOR #2……………..10.1
DAVIS #2………………10.0 NW
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….+3.47
TOTAL PRECIPITATION FOR THE YEAR………….45.38 DEPARTURE….+9.46
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 The low since midnight is 59F, the daily normal low is 57F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR SEPTEMBER 14
HIGH 90F IN 1931
LOW 34F IN 1911
PRECIP 2.90 INCHES IN 1944 (Great Atlantic Hurricane in 1944)
PEAK GUST 96e MPH E IN 1944 (Great Atlantic Hurricane in 1944)
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)
TODAY’S REPORT PREPARED BY: Benjamin Turner
