Wednesday, September 4, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, SEPTEMBER 4, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

A CLOUDY START, MIX OF SUN AND CLOUDS WITH A WARM
AND HUMID AFTERNOON….

After a cloudy start to the day, conditions improved
by mid to late morning with partly sunny skies.
Temperatures warmed up to the low 80s by early
afternoon with humid conditions. Dew points have been
ranging in the mid to upper 60s. It’s also been rather
breezy this afternoon with south-southwest winds
gusting between 20-30mph. Visibility today has been
lower than in recent days with maximum values of only
40 miles.

The high so far today is 82F, which is 6 degrees
above the daily normal maximum of 76F. The low since
midnight is 61F, which is 2 degrees above the normal
minimum of 59F.

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: Overcast stratus, breaks in overcast in
all directions
Temperature: 64F; Dew Point: 63F; Wind: S at 10G18 kts
Sea-level pressure: 30.02 ins. Hg, falling then rising
Visibility: 40 miles, 15 miles E-ESE due to a distant fog
6-hr Max temp: 64F
6-hr Min temp: 61F
24-hr Precip: 0.00 ins.
BHO SA 1155 E10 OVC 40 165/64/63/1910G18/002/
BINOVC DSNT FG ALQDS VSBY 15 E-ESE/ 8/6//
50006 10064 20061

10 A.M.
Weather: Broken cumulus
Temperature: 74F; Dew Point: 66F; Wind: S at 10G17 kts
Sea-level pressure: 29.97 ins. Hg, falling then rising
Visibility: 35 miles, distant haze
3-hr Precip: 0.00 ins.
BHO SA 1455 E20 BKN 35 148/74/66/1910G17/997/ DSNT
HZ ALQDS/ 8/800 56017

1 P.M.
Weather: Broken cumulus
Temperature: 82F; Dew Point: 65F; Wind: SW at 12G23 kts
Sea-level pressure: 29.88 ins. Hg, falling rapidly
Visibility: 35 miles, distant haze
6-hr Max temp: 82F
6-hr Min temp: 64F
BHO SA 1755 E40 BKN 35 120/82/65/2212G23/988/ DSNT HZ
ALQDS/ 8/800 56028 10082 20064

SUMMARY FOR TUESDAY, SEPTEMBER 3, 2019

TEMPERATURE (DEGREES F)
MAX…..77   NORMAL…..76
MIN…..61   NORMAL…..59
MEAN….69   NORMAL…..67

DEPARTURE FROM 30-YEAR NORMAL………………….+2
TOTAL DEPARTURE FOR THE MONTH………………….-3 [-1.2 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………4   DEPARTURE……….0
TOTAL COOLING UNITS FOR THE MONTH……………5   DEPARTURE………-6
TOTAL COOLING UNITS FOR THE SEASON…………624   DEPARTURE……..+76
TOTAL COOLING UNITS LAST SEASON TO DATE…….777   DEPARTURE…….-153

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..18 S   AT 10:59 P.M.
AERO…………………….16 S   AT 10:59 P.M.
ASOS…………………….19 S   AT 11:01 P.M.
DAVIS……………………19 S   AT 11:14 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….14 S   AT  9:44 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….14 S   AT 11:02 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………14 SE  AT  6:55 P.M.
AVERAGE WIND SPEED AND DIRECTION……………7.5 S
ASOS……………………8.5
DAVIS…………………..8.1 ESE [106 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……….0.37  DEPARTURE……+0.03
ASOS…………..0.36
TOTAL PRECIPITATION FOR THE YEAR……….37.52  DEPARTURE……+2.15
ASOS………….37.40

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 Low temp since midnight is 61F; normal low is 59F

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, Matt Douglas, Greg White