Tuesday, September 7, 2021

| September 7, 2021 | Reply

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

TUESDAY, SEPTEMBER 7, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0516E
SUNSET:  1807E
 
AN ABSOLUTE “TOP TEN” DAY HERE ON BLUE HILL….

It doesn’t get much better than this for early September. An
abundance of sunshine has been the theme today with only some
cumulus clouds popping up by early afternoon.

The air is comfortably dry with the dew point hanging out in
the mid 50s. This dry air has promoted excellent visibility,
which has averaged around 80 miles all day!

A nice westerly breeze has been just adding to the comfort of the
day. Speeds have been averaging between 5-10mph most of the day.
A few gusts exceeding 20 mph have been observed.

The high so far today is 77F, this is 1 degree above the daily
normal maximum of 76F. The low so far today is 57F, which is 2
degrees below the daily normal minimum of 59F.


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: Clear
Temperature: 61F; Dew Point: 55F; Relative Humidity: 80%
Wind: W @ 6 kts
Sea-level pressure: 1014.2 mb; 29.95 in. Hg; rising, then more slowly
Visibility: 80 miles
6-hr Max temp: 61F
6-hr Min temp: 57F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 80 142/61/55/2806/995/ 8/000 51012 10061 20057

10 A.M.
Weather: Clear, few cumulus distant SW-N
Temperature: 71F; Dew Point: 57F; Relative Humidity: 61%
Wind: W @ 7 kts
Sea-level pressure: 1014.7 mb; 29.96 in Hg; rising, then falling
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 80 147/71/57/2707/996/ FEW CU DSNT SW-N/ 8/200 50005

1 P.M.
Weather: Scattered cumulus
Temperature: 76F, Dew point: 56F; Relative Humidity: 50%
Wind: WSW @ 10G20 kts
Sea-level pressure: 1014.3 mb; 29.95 in Hg; falling, then steady
Visibility: 80 miles
6-hr Max temp: 77F
6-hr Min temp: 61F
6-hr Precip: 0.00 ins.
BHO SA 1755 45 SCT 80 143/76/56/2510G20/995/ 8/200 56004 10077 20061

SUMMARY FOR MONDAY, SEPTEMBER 6, 2021

TEMPERATURE (DEGREES F)
MAX…….80     NORMAL…..76
MIN…….61     NORMAL…..59
MEAN……71     NORMAL…..68

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………… +3
TOTAL DEPARTURE FOR THE MONTH……………………-20 [-3.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH…………….8  DEPARTURE……..+1
TOTAL HEATING UNITS FOR THE SEASON…………..36  DEPARTURE…….+11
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…………….8  DEPARTURE…….-18
TOTAL COOLING UNITS FOR THE SEASON………….658  DEPARTURE…….+36
TOTAL COOLING UNITS LAST SEASON TO DATE……..777  DEPARTURE……-119

PEAK WIND GUST (MPH):
                     Official……………….24 WNW @  9:33 P.M.
                     AEROVANE (south tower)…..25 WNW @  9:34 P.M.
                     VECTOR #2 (south tower)….26     @  9:33 P.M.
                     DAVIS #2 (south tower)…..25 W   @  3:42 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………………18 WNW @  9:19 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..19     @  9:41 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………19 WNW @  9:50 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…….10.0 W   [239 total miles]
                     VECTOR #2……………..10.8
                     DAVIS #2………………10.7 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…….0.00  DEPARTURE….-0.13
TOTAL PRECIPITATION FOR THE MONTH………….4.04  DEPARTURE….+3.33
TOTAL PRECIPITATION FOR THE YEAR………….44.38  DEPARTURE….+9.32

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   The low since midnight is 57F, the daily normal low is 59F

DAILY EXTREMES

Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR SEPTEMBER 7
HIGH 92F IN 2007, 2015
LOW 40F IN 1888
PRECIP 2.91 INCHES IN 1891
PEAK GUST 58e MPH W IN 1941

RECORDS FOR SEPTEMBER 8
HIGH 97F IN 2015
LOW 42F IN 1978
PRECIP 1.51 INCHES IN 2011
PEAK GUST 45 MPH S IN 2012

TODAY’S REPORT PREPARED BY: Matt Douglas

Category: Daily Discussions

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