Tuesday, August 18, 2020

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

TUESDAY, AUGUST 18, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

A FAIR-WEATHER DAY WITH A COOL WESTERLY
BREEZE….

Today we observed fog this morning, that
dissipated rapidly following the 7 A.M.
observation. This was the remnants of
some rainfall that happened earlier this
morning, amounting to 0.23 inches. Humidity
has dropped off significantly, sinking to
40% by noontime. This is with a rise in
visibility, reaching 75 miles by 1 P.M.

The high so far today is 82F, 3 degrees
above the daily normal maximum of 79F.
The low since midnight is 63F, a degree
above the normal minimum of 62F.

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus and altostratus, with
a few stratus fractus
Temperature: 65F; Dew Point: 63F; Relative Humidity: 93%
Wind: WSW at 8 kts
Sea-level pressure: 29.82 ins. Hg: rising then steady
Visibility: 25 miles, distant fog
6-hr Max temp: 65F
6-hr Min temp: 63F
24-hr Precip: 0.23 ins.
BHO SA 1155 110 SCT 25 099/65/63/2508/982/ FEW STFRA
DSNT FG ALQDS/ 8/670 70023 53007 10065 20063

10 A.M.
Weather: Broken cumulus
Temperature: 75F; Dew Point: 62F; Relative Humidity: 63%
Wind: W at 9 kts
Sea-level pressure: 29.82 ins. Hg: steady
Visibility: 65 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E30 BKN 65 099/75/62/2609/982/ 8/100 50000

1 P.M.
Weather: Broken cumulus
Temperature: 78F; Dew Point: 54F; Relative Humidity: 44%
Wind: WSW at 12G20 kts
Sea-level pressure: 29.81 ins. Hg: falling, then steady
Visibility: 75 miles
6-hr Max temp: 78F
6-hr Min temp: 64F
6-hr Precip: 0.00 ins.
BHO SA 1755 E70 BKN 75 096/78/54/2612G20/981/ 8/100 56003
10082 20064

SUMMARY FOR MONDAY, AUGUST 17, 2020

TEMPERATURE (DEGREES F)
MAX…..73   NORMAL…..79
MIN…..59   NORMAL…..62
MEAN….66   NORMAL…..71

DEPARTURE FROM 30-YEAR NORMAL……………..-5
TOTAL DEPARTURE FOR THE MONTH……………..+74 [+4.2 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………..1   DEPARTURE…….-5
TOTAL COOLING UNITS FOR THE MONTH…………….187  DEPARTURE……+72
TOTAL COOLING UNITS FOR THE SEASON……………674  DEPARTURE…..+208
TOTAL COOLING UNITS LAST SEASON TO DATE……….526  DEPARTURE…..+148

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..25 NE  AT  3:34 A.M.
AERO…………………….24 NE  AT  3:36 A.M.
ASOS…………………….24 NE  AT  2:23 A.M.
DAVIS……………………24 NE  AT  2:22 A.M
RMY N/A  MERLIN N/A
FASTEST MILE FOR YESTERDAY………………….16 NE  AT  2:24 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….16 SSW AT 10:44 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………17 NE  AT  2:23 A.M.
AVERAGE WIND SPEED AND DIRECTION…………….8.8 N
ASOS…………………….8.8
DAVIS……………………8.9 E [79 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.23  DEPARTURE……+0.10
ASOS…………..0.23
TOTAL PRECIPITATION FOR THE MONTH……….0.84  DEPARTURE……-1.52
ASOS…………..0.85
TOTAL PRECIPITATION FOR THE YEAR……….29.91  DEPARTURE……-3.44
ASOS………….30.66

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

08/01  87/66/77/+5/0.00/…/..             18 S    AERO 21 S    RMY 19
08/02  85/69/77/+5/0.02/…/..             36 S    AERO 37 S    RMY 38
08/03  91/75/83/+11/0.00/…/..            36 WSW  AERO 38 SW   RMY 36
08/04  83/71/77/5/0.21/…/..              67 SSE  AERO 71 S    RMY 70
08/05  90/68/79/+7/0.00/…/..             28 SW   AERO 30 SW   RMY 29
08/06  84/65/75/3/0.00/…/..   20 W    AERO 17 W    RMY 19
08/07  79/65/72/0/T/…/..                 16 NE   AERO 16 NE   RMY N/A
08/08  83/64/74/+2/0.00/…/..             20 S    AERO 20 S    RMY 19
08/09  90/65/78/+6/0.00/…/..             26 SSW  AERO 26 SSW  RMY 26
08/10  94/69/82/+11/0.00/…/..            22 W    AERO 20 W    RMY 20
08/11  92/72/82/+11/0.00/…/..            31 SSW  AERO 35 SSW  RMY 31  TSTM
08/12  93/74/84/+13/0.00/…/..            22 SSW  AERO 22 SW   RMY 19
08/13  88/71/80/+9/0.00/…/..             18 ENE  AERO 18 NE   RMY 18
08/14  82/67/75/+4/0.00/…/..             23 ENE  AERO 23 ENE RMY N/A
08/15  67/62/65/-6/T/…/..                33 NNE  AERO 32 NNE  RMY N/A
08/16  69/62/66/-5/…./…/..             26 ENE  AERO 28 ENE  RMY 26
08/17  73/59/66/-5/…./…/..             25 NE   AERO 24 NE   RMY N/A

08/18  The low since midnight is 63F, the daily normal low is 62F

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

RECORDS FOR AUGUST 18
HIGH 93F IN 2002
LOW 47F IN 1824
PRECIP 5.75 INCHES IN 1955 [DIANE] PEAK GUST 46 MPH WNW IN 2007

RECORDS FOR AUGUST 19
HIGH 90F IN 1906, 1966, 2002
LOW 48F IN 1958
PRECIP 7.02 INCHES IN 1955 [DIANE – RECORD FOR MONTH] PEAK GUST 78 MPH ENE IN 1991 – HURRICANE BOB

TODAY’S REPORT PREPARED BY: Benjamin Turner