Saturday, September 4, 2021

| September 5, 2021 | Reply

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

SATURDAY, SEPTEMBER 4, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0513E
SUNSET:  1813E
 
EVEN BETTER VISIBILITY WITH MOSTLY CLEAR WEATHER….

Today, again featured some pristine weather. Fall seems to be arriving
right on time, which is fortunate.

Skies were mostly clear save some fair weather cumulus that hung around
all day.  

Visibility was an amazing 85 miles all day, that’s a little better
than typical for a mid-fall day.

Wind is north westerly at an average of 10 mph with a max gust so far of
21 mph.  

The high so far today is 75F, this is 2 degrees below the daily
normal maximum of 77F. The low so far today is 55F, which is
5 degrees below the daily normal minimum of 60F.


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: N/A
Astronomical total minutes: N/A

Today’s Observations:

7 A.M.
Weather: Clear, few altocumulus
Temperature: 55F; Dew Point: 52F; Relative Humidity: 89%
Wind: NW @ 10G16 kts
Sea-level pressure: 1015.2 mb; 29.98 in. Hg; falling then rising
Visibility: 80 miles
6-hr Max temp: 55F
6-hr Min temp: 52F
24-hr Precip: Trace
BHO SA 1155 CLR 85 161/58/54/3007/001/ FEW CS OFFSHR/ 8/005 53011
10058 20055

10 A.M.
Weather: Clear, few cumulus WNW-N-E
Temperature: 69F; Dew Point: 55F; Relative Humidity: 60%
Wind: WNW @ 9 kts
Sea-level pressure: 1015.8 mb; 29.98 in Hg; falling, then steady
Visibility: 85 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 85 158/69/55/3009/000/ FEW CU WNW-N-E/ 8/100
58003

1 P.M.
Weather: Clear, few cumulus
Temperature: 73F, Dew point: 55F; Relative Humidity: 53%
Wind: NW @ 9G16 kts
Sea-level pressure: 1014.2 mb; 29.95 in Hg; falling steadily
Visibility: 85 miles
6-hr Max temp: 75F
6-hr Min temp: 58F
6-hr Precip: 0.00 ins.
BHO SA 1755 CLR 85 142/73/55/3209G16/995/ FEW CU ALQDS/ 8/100
57016 10075 20058

SUMMARY FOR FRIDAY, SEPTEMBER 3, 2021

TEMPERATURE (DEGREES F)
MAX…….72     NORMAL…..77
MIN…….52     NORMAL…..60
MEAN……62     NORMAL…..68

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………-6
TOTAL DEPARTURE FOR THE MONTH……………………-19 [-6.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….3  DEPARTURE……..+2
TOTAL HEATING UNITS FOR THE MONTH…………….8  DEPARTURE……..+5
TOTAL HEATING UNITS FOR THE SEASON…………..36  DEPARTURE…….+15
TOTAL HEATING UNITS LAST SEASON TO DATE……….4  DEPARTURE…….+32

COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-4
TOTAL COOLING UNITS FOR THE MONTH…………….0  DEPARTURE…….-14
TOTAL COOLING UNITS FOR THE SEASON………….650  DEPARTURE…….+40
TOTAL COOLING UNITS LAST SEASON TO DATE……..766  DEPARTURE……-116

PEAK WIND GUST (MPH):
                     Official……………….23 NW  @  1:31 P.M.
                     AEROVANE (south tower)…..23 NW  @  3:39 P.M.
                     VECTOR #2 (south tower)….25     @  1:31 P.M.
                     DAVIS #2 (south tower)…..21 NNW @  8:08 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  @  3:34 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..17     @  1:33 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 WNW @  1:33 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…….10.6 NW  [254 total miles]
                     VECTOR #2……………..11.5
                     DAVIS #2………………11.3 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…….4.00  DEPARTURE….-0.12
TOTAL PRECIPITATION FOR THE MONTH………….4.00  DEPARTURE….+3.66
TOTAL PRECIPITATION FOR THE YEAR………….44.34  DEPARTURE….+9.65

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/…/..          21 WSW AERO N/A    RMY N/A
08/21   86/69/78/+7/0.00/…/..          17 S   AERO 17 S   RMY N/A
08/22   74/66/70/-1/0.78/…/..          47 ESE AERO 48 ESE RMY N/A
08/23   83/68/76/+5/1.17/…/..          25 SSE AERO 26 SSE RMY N/A TSTM
08/24   86/67/77/+6/0.01/…/..          21 NNW AERO 21 NNW RMY N/A
08/25   89/70/80/+10/0.00/…/..         17 SW  AERO 18 SW  RMY N/A
08/26   92/72/82/+12/0.00/…/..         19 WSW AERO 18 WSW RMY N/A
08/27   89/70/80/+10/T/…/..            30 ENE AERO 30 ENE RMY N/A
08/28   70/59/65/-5/0.02/…/..          34 ENE AERO 34 ENE RMY N/A
08/29   72/59/66/-4/T/…/..             20 S   AERO 21 S   RMY N/A
08/30   84/67/76/+7/0.00/…/..          25 SW  AERO 26 SW  RMY N/A
08/31   80/65/73/+4/0.00/…/..          27 WNW AERO 28 WNW RMY N/A

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/…./…/..          34 NNE AERO 37 NNE RMY N/A    
09/02   71/55/63/-6/…./…/..          49 ENE AERO 52 ENE RMY N/A TSTM
09/03   72/52/62/-6/…./…/..          23 NW  AERO 23 NW  RMY N/A

09/04   The low since midnight is 55F, the daily normal low is 60F

RECORDS FOR THE MONTH

08/22 NEW PEAK GUST RECORD OF 47 MPH,
      BEATING THE OLD RECORD OF 44 MPH IN 1987

DAILY EXTREMES

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

RECORDS FOR SEPTEMBER 4
HIGH 90F IN 1953, 1973
LOW 46F IN 1987
PRECIP 3.22 INCHES IN 1922
PEAK GUST 47 MPH SE IN 1966

RECORDS FOR SEPTEMBER 5
HIGH 90F IN 1971
LOW 45F IN 1906
PRECIP 1.37 INCHES IN 1907
PEAK GUST 46 MPH NW IN 1994

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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