Sunday, September 22, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, SEPTEMBER 22, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

BEAUTIFUL WEATHER WITH WARM TEMPERATURES, DECREASING
HUMIDITY, AND RELATIVELY LOW CLOUD COVER….

With temperatures reaching 83F, and relatively low cloud
cover and humidity, today was beautiful and comfortable.
Our average high temperature for today is 69F, making
our maximum so far of 83F 14 degrees above normal. Our
low since midnight was 62F, which is 10 degrees above
our normal low of 52F.

Today’s Observations:

7 A.M.
Weather: Clear, few cirrus NNW-NE
Temperature: 65F; Dew Point: 57F; Wind: SW at 8 kts
Sea-level pressure: 30.16 ins. Hg, falling then rising
Visibility: 70 miles, thin smoke layer aloft
6-hr Max temp: 65F
6-hr Min temp: 62F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 70 213/65/57/2308/016/ FEW CI NNW-NE
THN K LYR ALF/ 8/001 53002 10065 20062

10 A.M.
Weather: Scattered cirrostratus
Temperature: 77F; Dew Point: 59F; Wind: WSW at 10 kts
Sea-level pressure: 30.14 ins. Hg, falling, then more slowly
Visibility: 70 miles, distant haze
3-hr Precip: 0.00 ins.
BHO SA 1455 250 SCT 70 205/77/59/2410/014/ DSNT HZ ALQDS/
8/005 58008

1 P.M.
Weather: Scattered cirrus
Temperature: 83F; Dew Point: 54F; Wind: SW at 13G17 kts
Sea-level pressure: 30.27 ins. Hg, falling unsteadily
Visibility: 70 miles
6-hr Max temp: 83F
6-hr Min temp: 65F
6-hr Precip: 0.00 ins.
BHO SA 1755 250 SCT 70 185/83/54/2313G17/008/ DSNT HZ ALQDS/
8/002 58020 10083 20065

SUMMARY FOR SATURDAY, SEPTEMBER 21, 2019

TEMPERATURE (DEGREES F)
MAX…..83   NORMAL…..70
MIN…..60   NORMAL…..53
MEAN….72   NORMAL…..61

DEPARTURE FROM 30-YEAR NORMAL…………………+11
TOTAL DEPARTURE FOR THE MONTH…………………-29 [-1.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON AUG TO JUL)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE………-5
TOTAL HEATING UNITS FOR THE MONTH…………..64   DEPARTURE………+7
TOTAL HEATING UNITS FOR THE SEASON………….76   DEPARTURE………-6
TOTAL HEATING UNITS LAST SEASON TO DATE……..47   DEPARTURE……..+29

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………7   DEPARTURE………+6
TOTAL COOLING UNITS FOR THE MONTH…………..32   DEPARTURE……..-20
TOTAL COOLING UNITS FOR THE SEASON…………651   DEPARTURE……..+62
TOTAL COOLING UNITS LAST SEASON TO DATE…….855   DEPARTURE…….-204

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..21 WNW AT 2:00 A.M.
AERO…………………….18 WNW AT 2:01 A.M.
ASOS…………………….20 NW  AT 2:00 A.M.
DAVIS……………………19 NW  AT 1:58 A.M. RMY 16
FASTEST MILE FOR YESTERDAY………………….14 NW  AT 1:37 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….15 WNW AT 1:37 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………15 WNW AT 1:37 A.M.
AVERAGE WIND SPEED AND DIRECTION…………….7.8 SW
ASOS…………………….8.1
DAVIS……………………8.1 W [276 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……….0.98  DEPARTURE……-1.75
ASOS…………..0.96
TOTAL PRECIPITATION FOR THE YEAR……….38.13  DEPARTURE……+0.37
ASOS………….37.99

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/…/..                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/-6/0.03/…/..                37 ENE AERO 36 ENE RMY 36
9/07  70/51/61/-5/0.27/…/..                37 N   AERO 37 N   RMY N/A
9/08  73/53/63/-3/0.00/…/..                25 W   AERO 21 W   RMY N/A
9/09  71/54/63/-3/0.00/…/..                17 SE  AERO 16 SE  RMY 16
9/10  73/57/65/0/0.00/…/..                 25 S   AERO 25 S   RMY N/A
9/11  83/63/73/+8/0.00/…/..                31 SW  AERO 32 SW  RMY N/A
9/12  70/52/61/-4/0.11/…/..                29 ENE AERO 28 ENE RMY 28
9/13  65/49/57/-7/0.00/…/..                29 ENE AERO 27 ENE RMY 27
9/14  69/49/59/-5/0.19/…/..                36 S   AERO 37 S   RMY 37
9/15  78/62/70/+6/0.00/…/..                24 W   AERO 23 W   RMY 22
9/16  72/54/63/0/0.00/…/..                 25 WNW AERO 23 WNW RMY 25
9/17  67/49/58/-5/0.00/…/..                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  The low since midnight is 62F, normal daily minimum is 52F

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

RECORDS FOR SEPTEMBER 22
HIGH 90F IN 1895, 1914
LOW 30F IN 1904 (Earliest freeze)
PRECIP 1.16 INCHES IN 2001
PEAK GUST 60 MPH SSW IN 1989

RECORDS FOR SEPTEMBER 23
HIGH 93F IN 1895,1914
LOW 33F IN 1904
PRECIP 2.67 INCHES IN 1994
PEAK GUST 62 MPH SSW IN 1989

TODAY’S REPORT PREPARED BY: Samantha Richard/ Ann Murphy