Thursday, September 9, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY, SEPTEMBER 9, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0518E
SUNSET: 1805E
LIGHT RAIN SO FAR TODAY WITH A COOL SOUTHERLY BREEZE….
Today featured light rain with very little in the way of
visibility or temperature variation. The temperature and
dew point were exactly 70F at each observation today.
The rain total on the day is 0.11 inches, with 0.05 falling
before 7 A.M. and 0.06 falling after.
Wind is southerly at an average speed of 10 mph. The highest
gust of 36 mph happened early on this morning.
Skies are overcast and the highest visibility seen so far is
8 miles.
The high so far today is 71F, this is 4 degrees below the daily
normal maximum of 75F. The low so far today is 68F, which is 10
degrees above the daily normal minimum of 58F.
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: N/A
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: Overcast stratus
Temperature: 70F; Dew Point: 70F; Relative Humidity: 100%
Wind: SSW @ 10G15 kts
Sea-level pressure: 1010.4 mb; 29.84 in. Hg; rising unsteadily
Visibility: 2 miles, fog
6-hr Max temp: 71F
6-hr Min temp: 68F
24-hr Precip: 0.05 ins.
BHO SA 1155 30 OVC 2F 104/70/70/2010G15/984/ 8/6// 70005 52001
10071 20068
10 A.M.
Weather: Light rain
Temperature: 70F; Dew Point: 70F; Relative Humidity: 100%
Wind: SSE @ 8G15 kts
Sea-level pressure: 1009.9 mb; 29.83 in Hg; rising then falling
Visibility: 2 miles, fog
3-hr Precip: 0.03 ins.
BHO SA 1455 30 OVC 2R-F 099/70/70/1508G15/983/ 8/6// 6003/ 55005
1 P.M.
Weather: Broken stratus, overcast nimbostratus
Temperature: 70F, Dew point: 70F; Relative Humidity: 100%
Wind: SSW @ 9 kts
Sea-level pressure: 1009.9 mb; 29.83 in Hg; steady
Visibility: 8 miles, fog
6-hr Max temp: 71F
6-hr Min temp: 69F
6-hr Precip: 0.06 ins.
BHO SA 1755 30 BKN 110 OVC 8R-F 099/70/70/2009/983/ 8/62/ 6006/
55000 10071 20069
SUMMARY FOR WEDNESDAY, SEPTEMBER 8, 2021
TEMPERATURE (DEGREES F)
MAX…….81 NORMAL…..76
MIN…….61 NORMAL…..58
MEAN……71 NORMAL…..67
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………… +4
TOTAL DEPARTURE FOR THE MONTH……………………-15 [-2.1 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…………….8 DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE SEASON…………..36 DEPARTURE……..+8
TOTAL HEATING UNITS LAST SEASON TO DATE……….4 DEPARTURE…….+32
COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….6 DEPARTURE……..+2
TOTAL COOLING UNITS FOR THE MONTH……………17 DEPARTURE…….-16
TOTAL COOLING UNITS FOR THE SEASON………….667 DEPARTURE…….+38
TOTAL COOLING UNITS LAST SEASON TO DATE……..789 DEPARTURE……-122
PEAK WIND GUST (MPH):
Official……………….43 S @ 4:38 P.M.
AEROVANE (south tower)…..45 S @ 4:38 P.M.
VECTOR #2 (south tower)….47 @ 4:38 P.M.
DAVIS #2 (south tower)…..45 S @ 4:14 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………………31 S @ 4:16 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..30 @ 4:14 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………32 S @ 4:15 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…….17.3 S [416 total miles]
VECTOR #2……………..17.7
DAVIS #2………………17.6 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…….0.05 DEPARTURE….-0.06
TOTAL PRECIPITATION FOR THE MONTH………….4.09 DEPARTURE….+3.15
TOTAL PRECIPITATION FOR THE YEAR………….44.38 DEPARTURE….+9.14
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/…/.. 34 NNE AERO 37 NNE RMY N/A
09/02 71/55/63/-6/2.53/…/.. 49 ENE AERO 52 ENE RMY N/A
09/03 72/52/62/-6/0.00/…/.. 23 NW AERO 23 NW RMY N/A
09/04 76/55/66/-2/0.00/…/.. 22 WNW AERO 21 WNW RMY N/A
09/05 72/60/66/-2/0.04/…/.. 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/…./…/.. 43 S AERO 45 S RMY N/A
09/09 The low since midnight is 68F, the daily normal low is 58F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR SEPTEMBER 9
HIGH 92F IN 2015
LOW 41F IN 1938
PRECIP 1.97 INCHES IN 1969
PEAK GUST 52 MPH WNW IN 1969, NW IN 1978
RECORDS FOR SEPTEMBER 10
HIGH 90F IN 1931,1989
LOW 41F IN 1956
PRECIP 5.60 INCHES IN 1999 (DAILY RECORD FOR SEPTEMBER)
PEAK GUST 48 MPH NW IN 1972
TODAY’S REPORT PREPARED BY: Benjamin Turner
