Wednesday, July 29, 2020

| July 29, 2020 | Reply

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

WEDNESDAY, JULY 29, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

CONTINUING HOT TEMPERATURES ATOP OF THE GREAT BLUE HILL…

Yesterday a passing shower left 0.01 inches of rain
just after the 1 P.M observation cooling off the hot
temperatures to the mid-80s. The high was 95 degrees
which is 2 degrees off of the record of 97 degrees for
the day.

Few clouds this morning steadily increasing throughout
the day with dew points staying in the low 60s. The
high so far today is 95 degrees. This is 14 degrees
above the daily normal high of 81F. The low since
midnight is 68F, which is 5 degrees above the daily
normal low of 63F

Today’s Observations:

7 A.M.
Weather: Clear, Few Cirrus
Temperature: 71F; Dew Point: 62F; Relative Humidity: 69%
Wind: W at 9 kts
Sea-level pressure: 29.84 ins. Hg: falling, then more slowly
Visibility: 65 miles
6-hr Max temp: 74F
6-hr Min temp: 68F
24-hr Precip: 0.01 ins.
BHO SA 1155 CLR 65 141/71/62/2809/994/ FEW CI/ 8/001 53010
70001 10074 20068

10 A.M.
Weather: Scattered Cirrus
Temperature: 84F; Dew Point: 61F; Relative Humidity: 45%
Wind: WNW at 5 kts
Sea-level pressure: 29.95 ins. Hg: rising, then falling
Visibility: 60 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 250 SCT 60 143/84/61/3005/995/ 8/002 50002

1 P.M.
Weather: Scattered Cumulus, Scattered Cirrus
Temperature: 89F; Dew Point: 59F; Relative Humidity: 37%
Wind: SW at 9 kts
Sea-level pressure: 29.91 ins. Hg: falling, then more rapidly
Visibility: 60 miles
6-hr Max temp: 95F
6-hr Min temp: 73F
6-hr Precip: 0.00 ins.
BHO SA 1755 50 SCT 250 SCT 60 130/89/59/2309/991/ 8/102 58013
10089 20073

SUMMARY FOR TUESDAY, JULY 28, 2020

TEMPERATURE (DEGREES F)
MAX…..95   NORMAL…..81
MIN…..74   NORMAL…..63
MEAN….85   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL……………..+13
TOTAL DEPARTURE FOR THE MONTH……………..+84 [+3.0 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………..20  DEPARTURE…….+2
TOTAL COOLING UNITS FOR THE MONTH…………….262  DEPARTURE…….+62
TOTAL COOLING UNITS FOR THE SEASON……………446  DEPARTURE……+117
TOTAL COOLING UNITS LAST SEASON TO DATE……….365  DEPARTURE…….+81

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..28  WSW AT 1:16 P.M.
AERO…………………….25  WSW AT 1:21 P.M.
ASOS…………………….26  W   AT 1:18 P.M.
DAVIS……………………26  W   AT 1:16 A.M
RMY 25  MERLIN 26
FASTEST MILE FOR YESTERDAY………………….18  WSW AT 1:18 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20  W   AT 1:18 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………20  W   AT 1:18 P.M.
AVERAGE WIND SPEED AND DIRECTION……………10.0 WSW
ASOS……………………10.2
DAVIS…………………..10.3 W [259 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.01  DEPARTURE……-0.13
ASOS…………..0.01
TOTAL PRECIPITATION FOR THE MONTH……….1.72  DEPARTURE……-1.84
ASOS…………..1.80
TOTAL PRECIPITATION FOR THE YEAR……….29.07  DEPARTURE……-1.46
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 The low since midnight is 68F, 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 JULY 29
HIGH 97F IN 1949
LOW 53F IN 1888,1914
PRECIP 1.53 INS IN 1901
PEAK GUST 40e MPH E IN 1941

RECORDS FOR JULY 30
HIGH 99F IN 1949
LOW 51F IN 1956
PRECIP 1.84 INS IN 1976
PEAK GUST 70e MPH SW 1944

TODAY’S REPORT PREPARED BY: Nicholas Rousseau

Category: Daily Discussions

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