Friday, October 18, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY OCTOBER 18, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

MOSTLY CLOUDY SKIES WITH DRY AND SEASONABLE CONDITIONS…

We observed mostly cloudy skies throughout the duration of
today’s observations. Visibility was maintained at 80 miles
as a result of lowering dew points and lowering relative humidity.
Winds continue to be gusty, but have relaxed a bit since yesterday’s
peak of 61 MPH – winds today topping out so far today at 30 MPH.

The high so far today is 55F, 5 degrees below the daily
normal maximum of 60F. The low since midnight is 45F,
3 degrees above the normal minimum of 42F.

Today’s Observations:

7 A.M.
Weather: Broken stratocumulus
Temperature: 47F; Dew Point: 40F; Wind: W at 12G19 kts,
Sea-level pressure: 29.63 ins. Hg, rising then rising more rapidly
Visibility: 80 miles
6-hr Max temp: 48F
6-hr Min temp: 45F
BHO SA 1155 E40 BKN 80 035/47/40/28012G19/963/ 8/60/ 53036
10048 2045

10 A.M.
Weather: Broken cumulus and stratocumulus
Temperature: 53F; Dew Point: 38F; Wind: WNW at 14G25 kts,
Sea-level pressure: 29.70 ins. Hg, rising steadily
Visibility: 80 miles
BHO SA 1455 E40 BKN 80 059/53/38/29014G25/970/ 8/8// 51024

1 P.M.
Weather: Broken cumulus and stratocumulus
Temperature: 55F; Dew Point: 36F; Wind: NW at 16G23 kts,
Peak Wind: 30 MPH (26kts) NW at 11:20 AM
Sea-level pressure: 29.72 ins. Hg, rising steadily
Visibility: 80 miles
6-hr Max temp: 55F
6-hr Min temp: 47F
BHO SA 1755 E45 BKN 80 065/55/36/31016G23/972/
PK WND 3126/1620/ 8/8// 51006 10055 20047

SUMMARY FOR THURSDAY, OCTOBER 17, 2019

TEMPERATURE (DEGREES F)
MAX…..60   NORMAL…..60
MIN…..46   NORMAL…..42
MEAN….53   NORMAL…..51

DEPARTURE FROM 30-YEAR NORMAL…………………+2
TOTAL DEPARTURE FOR THE MONTH…………………+5 [ 0.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………12  DEPARTURE………-2
TOTAL HEATING UNITS FOR THE MONTH…………..183  DEPARTURE………-9
TOTAL HEATING UNITS FOR THE SEASON………….276  DEPARTURE……..-58
TOTAL HEATING UNITS LAST SEASON TO DATE……..234  DEPARTURE……..+42

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE……….0
TOTAL COOLING UNITS FOR THE MONTH…………….2  DEPARTURE………-2
TOTAL COOLING UNITS FOR THE SEASON………….682  DEPARTURE……..+81
TOTAL COOLING UNITS LAST SEASON TO DATE……..874  DEPARTURE…….-192

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..61 E AT 1:28 A.M.
AERO…………………….63 E AT 1:27 A.M.
ASOS…………………….62 E AT 1:28 A.M.
DAVIS……………………61 E AT 12:09 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….46 E AT 1:31 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….41 E AT 1:29 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………46 E AT 1:28 A.M.
AVERAGE WIND SPEED AND DIRECTION…………….25.7 W
ASOS…………………….23.1
DAVIS……………………24.6 WSW [245 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……….4.62  DEPARTURE……+2.10
ASOS…………..4.88
TOTAL PRECIPITATION FOR THE YEAR……….43.04  DEPARTURE……+1.43
ASOS………….43.11

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  67/52/60/+3/0.06/…/..               28 SW  AERO 25 SSW RMY 29
10/02  74/49/62/+5/0.42/…/..               30 ENE AERO 25 ENE RMY 28
10/03  51/46/49/-7/…./…/..               28 ENE AERO 26 ENE RMY N/A
10/04  59/40/50/-6/…./…/..               38 NNW AERO 38 NNW RMY 38
10/05  58/35/47/-9/0.00/…/..               21 N   AERO 18 SSW RMY N/A
10/06  65/44/55/0/0.00/…/..                36 SSW AERO 35 SSW RMY N/A
10/07  77/57/67/+12/0.12/…/..              47 SSW AERO 46 SSW RMY 49
10/08  60/52/56/+2/T/…/..                  22 NE  AERO 18 NW  RMY N/A
10/09  55/49/52/-2/…./…/..               43 NE  AERO 37 NE  RMY 44
10/10  54/47/51/-3/…./…/..               41 NE  AERO 37 NE  RMY 42
10/11  52/48/50/-3/…./000/00               41 NE  AERO 39 NE  RMY 41
10/12  52/49/51/-2/…./…/..               39 NE  AERO 37 NE  RMY N/A
10/13  66/48/57/+4/…./…/..               18 WNW AERO 17 WNW RMY 18
10/14  67/51/59/+7/…./…/..               18 WSW AERO 17 WSW RMY N/A
10/15  61/43/52/0/…./…/..                18 NNW AERO 17 NNW RMY N/A
10/16  61/45/53/+2/…./…/..               58 ESE AERO 58 ESE RMY N/A
10/17  60/46/53/+2/…./…/..               61 E   AERO 63 E   RMY N/A

10/18 The low since midnight is 45F, normal daily minimum is 42F

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

RECORDS FOR OCTOBER 18
HIGH 82F IN 1908
LOW 26F IN 1939
PRECIP 2.79 INCHES IN 1975
SNOWFALL 3.0 INCHES IN 2009
PEAK GUST 66 MPH S IN 1967

RECORDS FOR OCTOBER 19
HIGH 81F IN 1945
LOW 21F IN 1922
PRECIP 3.64 INCHES IN 1932
SNOWFALL 1.0 INCHES IN 1972
PEAK GUST 66 MPH SSW IN 1967

TODAY’S REPORT PREPARED BY: ANDREW SWANSON