Sunday, September 8, 2019

| September 9, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, SEPTEMBER 8, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

GREAT VISIBILITY WITH PASSING CLOUDS AND DROPPING
HUMIDITY….

Visibility has stayed at a nice 80 miles for the
duration of the day today. Lowering humidity and
lots of sunshine with some passing clouds made for
beautiful, comfortable weather. Our high so far today
has been 72F, and our low since midnight was 53F.

PRELIMINARY STATS FOR AUGUST 2019

TEMPERATURE, Deg. F
Avg. Max. 80.4 [+1.2]
Avg. Min. 62.1 [+0.3]
Mean      71.5 [+1.0]
24-hour corrected mean: 70.5
Max. for month: 92F on the 19th
Min. for month: 51F on the 26th

COOLING DEGREE DAYS
Total cooling units:   211 [+22]
Total for the season:  619 [+82]
Total for last season: 753

PRECIPITATION, Inches
Total: 1.83 [-2.21]
Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed: 9.1 mph
Avg. corrected wind speed:   9.8 mph
Prevailing wind direction: N/A
Peak gust and direction: N/A

SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes:   N/A

Today’s Observations:

7 A.M.
Weather: Scattered cumulus, broken cirrus
Temperature: 57F; Dew Point: 52F; Wind: W at 11 kts
Sea-level pressure: 29.96 ins. Hg, rising, then more slowly
Visibility: 80 miles
6-hr Max temp: 57F
6-hr Min temp: 53F
24-hr Precip: 0.00 ins.
BHO SA 1155 40 BKN E250 BKN 80 146/57/52/2611/996/ 8/302
51027 10057 20053

10 A.M.
Weather: Scattered stratocumulus, scattered altocumulus,
scattered cirrus
Temperature: 67F; Dew Point: 51F; Wind: WNW at 9 kts
Sea-level pressure: 30.00 ins. Hg, rising, then more slowly
Visibility: 80 miles
3-hr Precip: 0.00 in.
BHO SA 1455 40 SCT 150 SCT 250 SCT 80 158/67/51/3009/000/
8/472 51012

1 P.M.
Weather: Broken stratocumulus, broken cirrus
Temperature: 70F; Dew Point: 52F; Wind: WNW at 8G15 kts
Sea-level pressure: 30.02 ins. Hg, rising unsteadily
Visibility: 80 miles
6-hr Max temp: 70F
6-hr Min temp: 52F
BHO SA 1755 E40 BKN E250 BKN 80 165/70/52/3008G15/002/
8/402 53007 10072 20057

SUMMARY FOR SATURDAY, SEPTEMBER 7, 2019

TEMPERATURE (DEGREES F)
MAX…..70   NORMAL…..75
MIN…..51   NORMAL…..58
MEAN….61   NORMAL…..66

DEPARTURE FROM 30-YEAR NORMAL………………….-5
TOTAL DEPARTURE FOR THE MONTH…………………-15 [-1.9 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………-3
TOTAL COOLING UNITS FOR THE MONTH…………..12   DEPARTURE……..-12
TOTAL COOLING UNITS FOR THE SEASON…………631   DEPARTURE……..+70
TOTAL COOLING UNITS LAST SEASON TO DATE…….822   DEPARTURE…….-191

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..37 N   AT  5:56 A.M.
AERO…………………….37 N   AT  3:50 A.M.
ASOS…………………….36 N   AT  5:18 A.M.
DAVIS……………………34 NE  AT 12:06 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….25 NNE AT  5:41 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….24 N   AT  3:54 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………25 NNE AT  5:41 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..13.4 W
ASOS…………………..12.4
DAVIS………………….13.6 NW [322 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.12
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.67  DEPARTURE……-0.17
ASOS…………..0.67
TOTAL PRECIPITATION FOR THE YEAR……….37.82  DEPARTURE……+1.95
ASOS………….37.70

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

8/01  84/66/75/+3/0.00/755/87               18 NNW AERO 20 NW  RMY 17
8/02  83/61/72/0/0.00/804/93                18 WSW AERO 18 WSW RMY 18
8/03  84/66/75/+3/0.00/302/35               25 SW  AERO 26 SW  RMY 25
8/04  83/66/75/+3/0.00/732/85               21 NE  AERO 23 SW  RMY 25
8/05  81/58/70/-2/0.00/842/98               20 S   AERO 18 S   RMY 19
8/06  79/63/71/-1/0.00/282/33               15 S   AERO 14 S   RMY 17
8/07  82/66/74/+2/…./367/43               32 SSW AERO 35 SSW RMY 35
8/08  84/67/76/+4/…./588/69               30 SW  AERO 24 WNW RMY 29
8/09  82/63/73/+1/…./815/96               28 NW  AERO 25 NW  RMY 26
8/10  78/59/69/-2/…./720/85               32 NW  AERO 28 NW  RMY 28
8/11  78/55/67/-4/0.00/734/87               28 W   AERO 25 W   RMY 28
8/12  82/60/71/0/0.00/749/89                25 W   AERO 23 W   RMY 26
8/13  77/66/72/+1/0.02/059/07               25 W   AERO 24 WSW RMY 24
8/14  75/62/69/-2/…./452/54               24 ENE AERO 22 ENE RMY 22
8/15  77/59/68/-3/…./568/68               17 ESE AERO 15 SSE RMY 16
8/16  78/61/70/-1/…./732/88               20 E   AERO 17 ESE RMY 18
8/17  78/67/73/+2/…./099/12               14 SE  AERO 15 SE  RMY 15
8/18  88/70/79/+8/…./529/64               18 SSW AERO 18 SSW RMY 21
8/19  92/69/81/+11/…./…/..              25 WSW AERO 23 WSW RMY 25
8/20  87/66/77/+7/…./…/..               18 W   AERO 14 WSW RMY N/A
8/21  85/68/77/+7/0.12/…/..               33 SW  AERO 32 SW  RMY 33
8/22  88/68/78/+8/0.00/…/..               25 W   AERO 21 W   RMY 26
8/23  78/60/69/-1/0.04/…/..               23 N   AERO 18 N   RMY 24
8/24  72/55/64/-6/0.00/…/..               25 ENE AERO 21 ENE RMY 22
8/25  66/56/61/-8/0.00/…/..               31 ENE AERO 25 ENE RMY 29
8/26  71/51/61/-8/0.00/…/..               25 NE  AERO 21 NE  RMY 25
8/27  77/54/66/-3/0.00/…/..               18 SSW AERO 18 SSW RMY 17
8/28  78/59/69/0/…./…/..                21 SSE AERO 18 SSE RMY 20
8/29  83/63/73/+4/…./…/..               25 WNW AERO 21 WNW RMY 26
8/30  84/59/72/+4/…./…/..               30 SW  AERO 30 SW  RMY 28
8/31  79/61/70/+2/…./…/..               21 W   AERO 18 W   RMY 20

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

9/01  73/56/65/-3/0.00/…/..                21 ENE AERO 14 ENE RMY 18
9/02  75/57/66/-2/0.37/…/..                39 W   AERO 41 W   RMY 41
9/03  77/61/69/+2/0.00/…/..                18 S   AERO 16 S   RMY N/A
9/04  83/61/72/+5/0.00/…/..                30 SW  AERO 28 SW  RMY 30
9/05  68/54/61/-6/0.00/…/..                23 NW  AERO 17 NW  RMY N/A
9/06  65/56/61/-6/…./…/..                37 ENE AERO 36 ENE RMY 36
9/07  70/51/61/-5/0.00/…/..                37 N   AERO 37 N   RMY N/A

9/08 Low temp since midnight is 53F; normal low is 57F

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

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

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

TODAY’S REPORT PREPARED BY: Samantha Richard

Category: Daily Discussions

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