Thursday, July 23, 2020

| July 23, 2020 | Reply

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

THURSDAY, JULY 23, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

HOT AND HUMID ON TOP OF THE GREAT BLUE HILL…

It was a cloudy morning with dew point
temperatures in the low 70s. 0.17
inches of rain was measured at the 7 A.M
observation from passing showers
overnight. Before the 1 P.M observation
cumulus had begun to tower north of the
observatory. The high so far today is 83
degrees. This is 2 degrees below the daily
normal high of 81F. The low since midnight
is 72F, which is 9 degrees above the daily
normal low of 63F

Today’s Observations:

7 A.M.
Weather: Scattered cumulus, broken altostratus
Temperature: 73F; Dew Point: 72F; Relative Humidity: 97%
Wind: WSW at 8 kts
Sea-level pressure: 30.02 ins. Hg: rising then steady
Visibility: 30 miles, hazy
6-hr Max temp: 73F
6-hr Min temp: 72F
24-hr Precip: 0.17 ins.
BHO SA 1155 E15 SCT E140 BKN 30 168/73/72/2408/002/ HAZY/
8/120 51009 70017 10073 20072

10 A.M.
Weather: Few cumulus, overcast altocumulus
Temperature: 82F; Dew Point: 76F; Relative Humidity: 77%
Wind: WSW at 6 kts
Sea-level pressure: 30.00 ins. Hg: rising then falling
Visibility: 35 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 140 SCT 35 160/82/76/2406/000/ FEW CU ALQDS/
8/150 58006

1 P.M.
Weather: Scattered cumulus, broken altocumulus, broken cirrostratus
Temperature: 83F; Dew Point: 67F; Relative Humidity: 57%
Wind: SSW at 12G18 kts
Sea-level pressure: 29.97 ins. Hg: falling, then more slowly
Visibility: 35 miles
6-hr Max temp: 83F
6-hr Min temp: 73F
6-hr Precip: 0.00 ins.
BHO SA 1755 E55 SCT E70 BKN E250 35 152/83/67/2112G18/997/
8/278 56008 10083 20073

SUMMARY FOR WEDNESDAY, JULY 22, 2020

TEMPERATURE (DEGREES F)
MAX…..80   NORMAL…..81
MIN…..67   NORMAL…..63
MEAN….74   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL…………….. +2
TOTAL DEPARTURE FOR THE MONTH…………….. +37 [+1.7 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………..9  DEPARTURE…….-4
TOTAL COOLING UNITS FOR THE MONTH…………….173  DEPARTURE…….+20
TOTAL COOLING UNITS FOR THE SEASON……………357  DEPARTURE…….+75
TOTAL COOLING UNITS LAST SEASON TO DATE……….326  DEPARTURE…….+31

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..16 ENE AT 3:28 P.M.
AERO…………………….M  M
ASOS…………………….18 NE  AT 6:48 A.M.
DAVIS……………………18 ENE AT 4:52 P.M RMY 16
FASTEST MILE FOR YESTERDAY………………….15 E   AT 4:08 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….14 E   AT 6:37 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………15 ENE AT 3:28 P.M.
AVERAGE WIND SPEED AND DIRECTION……………7.5 ENE
ASOS……………………8.1
DAVIS………………….8.1 ENE [65 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.17  DEPARTURE……+0.05
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.23  DEPARTURE……-1.49
ASOS…………..1.30
TOTAL PRECIPITATION FOR THE YEAR……….28.58  DEPARTURE……-1.11
ASOS………….29.31

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/…/..             20 ENE  AERO 16 NNE  RMY 18
07/07  78/60/69/-2/0.00/…/..             25 S    AERO 25 S    RMY 26
07/08  83/64/74/+2/0.00/…/..             32 SSW  AERO 32 SSW  RMY 32
07/09  89/70/80/+8/0.00/…/.              24 S    AERO 23 S    RMY 22
07/10  83/70/77/+5/0.05/…/..             30 SSE  AERO 32 SSE  RMY N/A
07/11  85/70/78/+6/0.00/…/..             39 S    AERO 39 S    RMY 38
07/12  86/70/78/+6/0.00/…/..             28 WSW  AERO 28 WSW  RMY 29
07/13  82/69/76/+4/0.23/…/..             30 SSE  AERO 31 SSE  RMY 30  TSTM
07/14  78/63/71/-1/0.00/…/..             26 ENE  AERO 25 ENE  RMY 26
07/15  72/59/66/-6/0.00/…/..             21 NE   AERO 21 NE   RMY N/A
07/16  73/57/65/-7/0.00/…/..             21 E    AERO 21 E    RMY 19
07/17  71/57/64/-8/0.19/…/..             24 SSW  AERO 24 SSW  RMY 25
07/18  89/66/78/+6/0.00/…/..             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 The low since midnight is 72F, 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 23
HIGH 99F IN 1952
LOW 51F IN 1923,1977
PRECIP 1.82 INS IN 1953
PEAK GUST 54e MPH S IN 1946

RECORDS FOR JULY 24
HIGH 96F IN 1987
LOW 49F IN 1893,1912
PRECIP 2.27 INS IN 2008
PEAK GUST 46 MPH NE IN 2009

TODAY’S REPORT PREPARED BY: Nicholas Rousseau

Category: Daily Discussions

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