Saturday, August 1, 2020

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

SATURDAY, AUGUST 1, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

DECENT VISIBILITY WITH FAIR WEATHER AND
LIGHT WINDS ATOP GREAT BLUE HILL….

Today we observed partly cloudy skies, with
a decent visibility of 70 miles seen at 1 P.M.
Wind was light, but shifted from north to
east-southeast between 10 A.M. and noontime.
Cloud cover increased slightly since this
morning, now covering more than half the
sky. The dew point has remained in the low
60s, making for a bearable midsummers’ day.

A review of 90+ degree days so far this year
indicates a total of 7. Per our Chief Scientist,
Mike Iacono, “the full record mean (1885-2019)
number of days is 6 for the year, but the most
recent 30-year average is 9 for the year, so
it’s increasing”. The most ever recorded during the
year was 23 back in 1949 and in 2002.

Heat wave section written by Andrew Swanson!

The high so far today is 87 degrees. This
is 6 degrees above the daily normal high
of 81F. The low since midnight is 66F,
which is 3 degrees above the daily normal
low of 63F.

Today’s Observations:

7 A.M.
Weather: Scattered cirrus, few altocumulus
Temperature: 72F; Dew Point: 64F; Relative Humidity: 76%
Wind: NNW at 4 kts (wind light and variable)
Sea-level pressure: 29.94 ins. Hg: rising, then more rapidly
Visibility: 30 miles, hazy
6-hr Max temp: 72F
6-hr Min temp: 66F
24-hr Precip: 0.00 ins.
BHO SA 1155 250 SCT 30 140/72/64/3404/994/ FEW AC ALQDS HAZY
WND L/V/ 8/081 51019 10072 20066

10 A.M.
Weather: Scattered cirrus, few cumulus
Temperature: 81F; Dew Point: 62F; Relative Humidity: 53%
Wind: N at 4 kts (wind light and variable)
Sea-level pressure: 29.98 ins. Hg: falling, then rising
Visibility: 60 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 250 SCT 60 152/81/62/3604/998/ FEW CU ALQDS WND L/V/
8/101 51012

1 P.M.
Weather: Scattered Cumulus
Temperature: 87F; Dew Point: 61F; Relative Humidity: 42%
Wind: ESE at 5 kts (wind light)
Sea-level pressure: 29.97 ins. Hg: falling steadily
Visibility: 70 miles
6-hr Max temp: 87F
6-hr Min temp: 72F
6-hr Precip: 0.00 ins.
BHO SA 1755 50 SCT 70 148/87/61/1105/997/ WND LGT/ 8/100 58004
10087 20072

SUMMARY FOR FRIDAY, JULY 31, 2020

TEMPERATURE (DEGREES F)
MAX…..84   NORMAL…..81
MIN…..69   NORMAL…..63
MEAN….77   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL………………+5
TOTAL DEPARTURE FOR THE MONTH……………..+97 [+2.9 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………..12  DEPARTURE…….+5
TOTAL COOLING UNITS FOR THE MONTH…………….303  DEPARTURE……+81
TOTAL COOLING UNITS FOR THE SEASON……………487  DEPARTURE…..+136
TOTAL COOLING UNITS LAST SEASON TO DATE……….411  DEPARTURE……+76

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..14 ENE AT 3:54 P.M.
AERO…………………….14 ENE AT 3:41 P.M.
ASOS…………………….15 ENE AT 3:55 P.M.
DAVIS……………………16 ENE AT 3:55 P.M
RMY 15  MERLIN 14
FASTEST MILE FOR YESTERDAY………………….10 ENE AT 3:54 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….12 ENE AT 3:55 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………12  E  AT 3:54 P.M.
AVERAGE WIND SPEED AND DIRECTION……………6.0 NE
ASOS……………………6.3
DAVIS…………………..6.4 NE [43 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……….1.72  DEPARTURE……-2.30
ASOS…………..1.80
TOTAL PRECIPITATION FOR THE YEAR……….29.07  DEPARTURE……-1.92
ASOS………….29.81

PRELIMINARY CLIMATE SUMMARY FOR JULY 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

07/01  76/63/70/0/0.00/228/25              16 E    AERO 14 E    RMY 14  TSTM
07/02  86/61/74/4/0.00/803/88              30 WSW  AERO 25 WSW  RMY 33
07/03  73/60/67/-4/0.00/091/10             30 NE   AERO 28 NE   RMY 30
07/04  79/60/70/-1/0.00/565/62             16 S    AERO 16 S    RMY 16
07/05  83/63/73/+2/0.54/373/41             24 NW   AERO 30 NW   RMY 26  TSTM
07/06  73/60/67/-4/0.00/482/53             20 ENE  AERO 16 NNE  RMY 18
07/07  78/60/69/-2/0.00/454/50             25 S    AERO 25 S    RMY 26
07/08  83/64/74/+2/0.00/227/25             32 SSW  AERO 32 SSW  RMY 32
07/09  89/70/80/+8/0.00/834/92             24 S    AERO 23 S    RMY 22
07/10  83/70/77/+5/0.05/109/12             30 SSE  AERO 32 SSE  RMY N/A
07/11  85/70/78/+6/0.00/614/68             39 S    AERO 39 S    RMY 38
07/12  86/70/78/+6/0.00/830/92             28 WSW  AERO 28 WSW  RMY 29
07/13  82/69/76/+4/0.23/306/34             30 SSE  AERO 31 SSE  RMY 30  TSTM
07/14  78/63/71/-1/0.00/369/41             26 ENE  AERO 25 ENE  RMY 26
07/15  72/59/66/-6/0.00/539/60             21 NE   AERO 21 NE   RMY N/A
07/16  73/57/65/-7/0.00/815/91             21 E    AERO 21 E    RMY 19
07/17  71/57/64/-8/0.19/027/03             24 SSW  AERO 24 SSW  RMY 25
07/18  89/66/78/+6/0.00/822/92             18 W    AERO 17 W    RMY 19
07/19  92/69/81/+9/0.00/…/..             28 S    AERO 28 S    RMY 26
07/20  91/72/82/+10/T/…/..               25 SSW  AERO 25 SSW  RMY N/A
07/21  88/68/78/+6/0.00/…/..             25 W    AERO 25 W    RMY 24
07/22  80/67/74/+2/…./…/..             16 ENE  AERO M  M    RMY 16
07/23  88/68/78/+6/0.48/…/..             31 N    AERO 32 N    RMY 31  TSTM
07/24  81/68/75/+3/0.00/…/..             15 ENE  AERO 15 ENE  RMY 16
07/25  88/67/78/+6/0.00/…/..             18 W    AERO 18 WNW  RMY N/A
07/26  89/70/80/+8/0.00/…/..             27 W    AERO 28 W    RMY 27
07/27  94/72/83/+11/0.00/…/..            23 SW   AERO 25 SW   RMY N/A
07/28  95/74/85/+13/0.01/…/..            28 WSW  AERO 25 WSW  RMY 25
07/29  90/68/79/+7/0.00/…/..             23 SSW  AERO 25 SSW  RMY 24
07/30  88/71/80/+8/0.00/…/..             29 W    AERO 28 W    RMY 29
07/31  84/69/77/+5/0.00/…/..             14 ENE  AERO 14 ENE  RMY 15

08/01  The low since midnight is 66F, the daily normal low is 63F

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

RECORDS FOR AUGUST 1
HIGH 97F IN 1917
LOW 49F IN 1891
PRECIP 3.61 INCHES IN 1927
PEAK GUST 41 MPH NNW IN 1985

RECORDS FOR AUGUST 2
HIGH 101F IN 1975 [STATION RECORD MAXIMUM – Tied with 8/10/1949] LOW 50F IN 1929, 1947
PRECIP 1.59 INCHES IN 1946
PEAK GUST 50 MPH SW IN 2006

TODAY’S REPORT PREPARED BY: Benjamin Turner