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Thursday, September 26, 2019

September 26, 2019

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, SEPTEMBER…

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, SEPTEMBER 26, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

MORNING FOG LEADS TO INCREASING CLOUDS AND
WIND IN THE AFTERNOON….

Today began foggy with a visibility of a 1/16th mile, increasing
to a max of 60 miles at the 10 A.M. observation. Skies became
cloudier as the day went on, being almost overcast at 1 P.M.
Dew points have held in the mid to upper 50s, with an afternoon
humidity of 40%. A sea breeze has been coming in from the
southeast, becoming more significant in the afternoon. The peak
gust so far today is 40 mph, observed around 3 P.M.

Very little has been measured for rainfall this month, with a
monthly total of only 1.02 inches. That is 2.30 inches below
normal at this point in the month.

The high so far today has been 79F, which is 11 degrees above
the normal high of 68F. The low since midnight was 57F,
which is 6 degrees above our normal low of 51F.

Today’s Observations:

7 A.M.
Weather: Fog
Temperature: 59F; Dew Point: 59F; Wind: S at 8 kts
Sea-level pressure: 29.85 ins. Hg, rising then falling
Visibility: 1/16th mile, fog
6-hr Max temp: 59F
6-hr Min temp: 57F
24-hr Precip: 0.00 ins.
BHO SA 1155 X W2 1/16F 108/59/59/1808/985/ 8//// 58000
10059 20057

10 A.M.
Weather: Scattered cirrostratus, few cumulus in
all directions
Temperature: 73F; Dew Point: 58F; Wind: S at 8 kts
Sea-level pressure: 29.84 ins. Hg, rising then falling
Visibility: 60 miles, distant fog offshore
3-hr Precip: 0.00 ins.
BHO SA 1455 250 SCT 60 104/73/58/1808/984/ FEW AC ALQDS
DSNT FG OFFSHR/ 8/078 58004

1 P.M.
Weather: Broken altocumulus
Temperature: 78F; Dew Point: 53F; Wind: S at 15G25 kts,
Peak wind: 30 MPH (26 kts) at 12:35 P.M.
Sea-level pressure: 29.76 ins. Hg, falling, then more
rapidly
Visibility: 35 miles, hazy
6-hr Max temp: 79F
6-hr Min temp: 59F
6-hr Precip: 0.00 ins.
BHO SA 1755 E180 BKN 35 078/78/53/1915G25/976/ HAZY PK
WND 1926/35/ 8/070 56026 10079 20059

SUMMARY FOR WEDNESDAY, SEPTEMBER 25, 2019

TEMPERATURE (DEGREES F)
MAX…..73   NORMAL…..68
MIN…..50   NORMAL…..51
MEAN….62   NORMAL…..60

DEPARTURE FROM 30-YEAR NORMAL…………………+2
TOTAL DEPARTURE FOR THE MONTH…………………+9 [+0.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON AUG TO JUL)
TOTAL HEATING UNITS FOR YESTERDAY……………3   DEPARTURE………-3
TOTAL HEATING UNITS FOR THE MONTH…………..67   DEPARTURE……..-13
TOTAL HEATING UNITS FOR THE SEASON………….79   DEPARTURE……..-26
TOTAL HEATING UNITS LAST SEASON TO DATE……..61   DEPARTURE……..+18

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………-1
TOTAL COOLING UNITS FOR THE MONTH…………..54   DEPARTURE………-2
TOTAL COOLING UNITS FOR THE SEASON…………676   DEPARTURE……..+83
TOTAL COOLING UNITS LAST SEASON TO DATE…….855   DEPARTURE…….-179

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..22 W   AT 11:52 A.M.
AERO…………………….21 W   AT 11:58 A.M.
ASOS…………………….21 NW  AT 11:34 A.M.
DAVIS……………………21 W   AT 11:54 A.M. RMY 21
FASTEST MILE FOR YESTERDAY………………….14 W   AT 11:42 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….15 NW  AT 11:44 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………16 WNW AT 11:39 A.M.
AVERAGE WIND SPEED AND DIRECTION……………..8.5 WNW
ASOS……………………..9.0
DAVIS…………………….9.0 W [279 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.15
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.02  DEPARTURE……-2.30
ASOS…………..0.98
TOTAL PRECIPITATION FOR THE YEAR……….38.17  DEPARTURE……-0.18
ASOS………….38.02

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

9/01  73/56/65/-3/0.00/703/89                21 ENE AERO 14 ENE RMY 18
9/02  75/57/66/-2/0.37/165/21                39 W   AERO 41 W   RMY 41
9/03  77/61/69/+2/0.00/643/82                18 S   AERO 16 S   RMY N/A
9/04  83/61/72/+5/0.00/375/48                30 SW  AERO 28 SW  RMY 30
9/05  68/54/61/-6/0.00/513/66                23 NW  AERO 17 NW  RMY N/A
9/06  65/56/61/-6/0.03/054/07                37 ENE AERO 36 ENE RMY 36
9/07  70/51/61/-5/0.27/325/42                37 N   AERO 37 N   RMY N/A
9/08  73/53/63/-3/0.00/631/82                25 W   AERO 21 W   RMY N/A
9/09  71/54/63/-3/0.00/537/70                17 SE  AERO 16 SE  RMY 16
9/10  73/57/65/0/0.00/207/27                 25 S   AERO 25 S   RMY N/A
9/11  83/63/73/+8/0.00/419/55                31 SW  AERO 32 SW  RMY N/A
9/12  70/52/61/-4/0.11/015/02                29 ENE AERO 28 ENE RMY 28
9/13  65/49/57/-7/0.00/741/98                29 ENE AERO 27 ENE RMY 27
9/14  69/49/59/-5/0.19/030/04                36 S   AERO 37 S   RMY 37
9/15  78/62/70/+6/0.00/600/80                24 W   AERO 23 W   RMY 22
9/16  72/54/63/0/0.00/673/90                 25 WNW AERO 23 WNW RMY 25
9/17  67/49/58/-5/0.00/611/82                23 NW  AERO 23 N   RMY N/A
9/18  61/49/55/-7/0.00/…/..                26 NE  AERO 25 NE  RMY 25
9/19  67/43/55/-7/0.00/…/..                17 NE  AERO 18 NE  RMY N/A
9/20  78/50/64/+2/0.00/…/..                21 W   AERO 18 W   RMY 20
9/21  83/60/72/+11/0.00/…/..               21 WNW AERO 18 WNW RMY N/A
9/22  85/62/74/+13/0.00/…/..               24 SW  AERO 23 SW  RMY 25
9/23  88/65/77/+17/0.00/…/..               29 SSW AERO 28 SSW RMY 29
9/24  76/56/66/+6/0.04/…/..                26 W   AERO 26 W   RMY 27
9/25  73/50/62/+2/0.00/…/..                22 W   AERO 21 W   RMY 21

9/26  The low since midnight is 57F, normal daily minimum is 51F

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

RECORDS FOR SEPTEMBER 26
HIGH 91F IN 2007
LOW 36F IN 1905,1922,1978
PRECIP 3.84 INCHES IN 1888
PEAK GUST 54e MPH S IN 1977

RECORDS FOR SEPTEMBER 27
HIGH 86F IN 2017
LOW 32F IN 1947
PRECIP 2.26 INCHES IN 1962
PEAK GUST 100 MPH SSE IN 1985 (HURRICANE GLORIA)

TODAY’S REPORT PREPARED BY: Benjamin Turner and Greg White

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Blue Hill Observatory & Science Center · Legal

Data Use & Privacy Policy

Please read the full Policy before accessing Observatory data · Effective January 1, 2025

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
Part I — Data Use Policy
§ 01

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