Friday, October 8, 2021

| October 8, 2021 | Reply

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

FRIDAY, OCTOBER 8, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0549E
SUNSET:  1713E

A PLEASANT FALL DAY ATOP GREAT BLUE HILL….

Not much has changed since yesterday in the weather department.
We again are experiencing mostly sunny skies and light winds.
Temperatures are a few degrees cooler today, though, thanks to
an onshore easterly flow yet still above average. Dew points
remain in the low to mid-50s, which is anomalously warm for
this time of year. As such, our overnight lows are where this
month’s warmth is occuring. The morning low both yesterday
and today is 55, which is nearly 10 degrees above the norm.

Visibility-wise, we began around 35 miles in the morning
increasing to 65 miles by early afternoon.

The high so far today is 69F, 5 degrees above the normal max of
64F. The low since midnight is 55F, 8 degrees above the normal 
low of 47F. 


PRELIMINARY STATS FOR SEPTEMBER 2021

TEMPERATURE, Deg. F
Avg. Max. 73.2 [+0.5]
Avg. Min. 57.4 [+1.8]
Mean      65.3 [+1.1]
24-hour corrected mean: 64.8
Max. for month: 82F on the 15th
Min. for month: 45F on the 29th

HEATING DEGREE DAYS
Total heating units:     46 [-54]
Total for the season:    74 [-44]
Total for last season:   98

COOLING DEGREE DAYS
Total cooling units:      62 [-12]
Total for the season:    714 [+44]
Total for last season:   830

PRECIPITATION, Inches
Total: 6.64 [+2.58]
Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed:  10.5 mph
Avg. corrected wind speed:    11.0 mph
Prevailing wind direction:   NW [11%]
Peak gust and direction:     49 ENE on the 2nd
SUNSHINE:
Campbell-Stokes card minutes: 11490 of a possible 21582, or 53%
Astronomical total minutes: 11965 of a possible 22423, or 53%


Today’s Observations:

7 A.M.
Weather: Scattered altocumulus (few cirrus disant S-WSW)
Temperature: 58F; Dew Point: 54F; Relative Humidity: 87%
Wind: NNE @ 9G14 kts
Sea-level pressure: 1021.7 mb; 30.17 in. Hg: rising, then rising more rapidly
Visibility: 35 miles, thin fog
6-hr Max temp: 58F
6-hr Min temp: 55F
24-hr Precip: 0.00 ins.
BHO SA 1155 50 SCT 35 217/58/54/0209G14/017/ FEW CI DSNT S-WSW THN F ALQDS/
8/031 53011 10058 20055

10 A.M.
Weather: Clear (patch of AC/AS SSW-WNW)
Temperature: 67F; Dew Point: 53F; Relative Humidity: 61%
Wind: ENE @ 7G11kts
Sea-level pressure: 1022.5 mb; 30.19 in Hg; rising, then increasing more slowly
Visibility: 65 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 65 225/67/53/0708G11/019/ PTCH AC/AS SSW-WNW HAZY/ 8/030 51008

1 P.M.
Weather: Clear (few cumulus distant SW-N)
Temperature: 68F, Dew point: 52F; Relative Humidity: 57%
Wind: ENE @ 8G13 kts
Sea-level pressure: 1022.2 mb; 30.19 in Hg; falling unsteadily
Visibility: 65 miles, hazy
6-hr Max temp: 73F
6-hr Min temp: 57F
6-hr Precip: 0.00 ins.
BHO SA 1755 CLR 65 222/68/52/0708G13/019/ FEW CU DSNT SW-N HAZY/ 8/100
57003 10069 20058

SUMMARY FOR THURSDAY, OCTOBER 7, 2021

TEMPERATURE (DEGREES F)
MAX…….73     NORMAL…..64
MIN…….55     NORMAL…..47
MEAN……64     NORMAL…..56

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..+8
TOTAL DEPARTURE FOR THE MONTH……………………..+8 [+0.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….1  DEPARTURE……..-9
TOTAL HEATING UNITS FOR THE MONTH……………48  DEPARTURE…….-12
TOTAL HEATING UNITS FOR THE SEASON………….122  DEPARTURE…….-55
TOTAL HEATING UNITS LAST SEASON TO DATE……..143  DEPARTURE…….-21

COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH…………….0  DEPARTURE……..-4
TOTAL COOLING UNITS FOR THE SEASON………….714  DEPARTURE…….+40
TOTAL COOLING UNITS LAST SEASON TO DATE……..831  DEPARTURE……-117

PEAK WIND GUST (MPH):
                     Official……………….15 WSW @  9:57 P.M.
                     AEROVANE (south tower)…..15 W   @  1:47 A.M.
                     VECTOR #2 (south tower)….16     @  9:57 P.M.
                     DAVIS #2 (south tower)…..15 WSW @ 10:50 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………………11 W   @  1:01 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15     @  9:57 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………12 W   @ 12:57 A.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…….. 6.0 W  [144 total miles]
                     VECTOR #2……………… 7.3
                     DAVIS #2………………. 6.9 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….-0.17
TOTAL PRECIPITATION FOR THE MONTH………….2.08  DEPARTURE….+0.92
TOTAL PRECIPITATION FOR THE YEAR………….49.06  DEPARTURE….+9.49

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/+3/0.00/557/72          24 WNW AERO 25 WNW RMY N/A
09/07   78/57/68/+1/0.00/732/95          23 WSW AERO 22 WSW RMY N/A 
09/08   81/61/71/+4/0.00/646/84          43 S   AERO 45 S   RMY N/A
09/09   71/64/68/+1/0.90/000/00          33 S   AERO 36 S   RMY N/A
09/10   74/55/65/-1/0.04/595/78          31 NW  AERO 32 WNW RMY N/A
09/11   75/51/63/-3/0.00/730/96          24 SW  AERO 24 SW  RMY N/A 
09/12   79/60/70/+4/0.00/591/78          33 SW  AERO 32 SW  RMY N/A
09/13   77/62/70/+5/0.06/559/74          22 NW  AERO 23 NW  RMY N/A
09/14   75/59/67/+2/0.00/444/59          23 S   AERO 25 S   RMY N/A
09/15   82/65/74/+9/T/539/72             32 SSW AERO 35 SSW RMY N/A
09/16   69/61/65/+1/0.27/037/05          24 ENE AERO 24 ENE RMY N/A TSTM       
09/17   66/60/63/-1/0.02/000/00          22 NE  AERO 23 NE  RMY N/A
09/18   74/62/68/+5/0.04/207/28          17 WNW AERO 18 WNW RMY N/A TSTM
09/19   71/57/64/+1/0.15/619/84          23 NNE AERO 24 NNE RMY N/A
09/20   71/55/63/0/0.00/647/88           20 SE  AERO 20 SE  RMY N/A
09/21   75/55/65/+3/0.00/490/67          19 SSE AERO 20 SSE RMY N/A
09/22   75/65/70/+8/0.02/153/21          30 S   AERO 30 S   RMY N/A
09/23   78/65/72/+10/0.08/298/41         36 SSE AERO 37 SSE RMY N/A
09/24   75/62/69/+8/0.02/007/01          43 SSE AERO 45 SSE RMY N/A 
09/25   74/59/67/+6/0.02/303/42          14 N   AERO 14 NNW RMY N/A 
09/26   73/54/64/+4/0.57/510/71          33 WNW AERO 32 WNW RMY N/A
09/27   73/52/63/+3/T/529/74             30 SW  AERO 30 SW  RMY N/A
09/28   67/52/60/+1/0.40/028/04          27 SSW AERO 25 SSW RMY N/A TSTM
09/29   63/45/54/-5/0.00/568/80          25 NNW AERO 25 NNW RMY N/A 
09/30   60/46/53/-6/0.01/354/50          22 NNW AERO 21 NNW RMY N/A

PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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

10/01   64/44/54/-4/0.00/…/..          20 WNW AERO 20 WNW RMY N/A
10/02   73/47/60/+2/0.00/…/..          24 WSW AERO 23 WSW RMY N/A 
10/03   65/55/60/+3/0.09/…/..          19 E   AERO 19 E   RMY N/A
10/04   59/51/55/-2/1.69/…/..          30 E   AERO 30 E   RMY N/A
10/05   58/50/54/-3/0.30/…/..          22 NNE AERO 23 NE  RMY N/A
10/06   69/50/60/+4/…./…/..          15 N   AERO 16 N   RMY N/A
10/07   73/55/64/+8/0.00/…/..          15 WSW AERO 15 W   RMY N/A

10/08   The low since midnight is 55F, the daily normal low is 47F

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

RECORDS FOR OCTOBER 8
HIGH 81F IN 1916,1990
LOW 28F IN 1919
PRECIP 2.22 INCHES IN 1891
SNOWFALL TRACE IN 1988, 2001 (EARLIEST DATE)
PEAK GUST 60 MPH NE IN 1996

RECORDS FOR OCTOBER 9
HIGH 82F IN 2011
LOW 29F IN 1907,1937
PRECIP 2.54 INCHES IN 1976
SNOWFALL TRACE IN 1988, 2001
PEAK GUST 81e MPH S IN 1976 (RECORD FOR MONTH)

TODAY’S REPORT PREPARED BY: Andrew Swanson

Category: Daily Discussions

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