Sunday, August 4, 2019

| August 4, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, AUGUST 4, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

ANOTHER FAIR, NEAR AVERAGE SUMMER DAY ATOP
GREAT BLUE HILL….

We observed hazy conditions throughout the day,
limiting visibility to a maximum of 45 miles.
Cloud cover increased from morning to afternoon,
with skies becoming mostly cloudy by 1 P.M. Wind has
been light and northwesterly, blowing at an average
speed of 5 mph. The high so far today is 83F, 2 degrees
above the daily normal maximum of 81F. The low
since midnight is 67F, 4 degrees above the normal
low of 63F.

PRELIMINARY STATS FOR JULY 2019

TEMPERATURE, Deg. F
Avg. Max. 84.6 [+3.8]
Avg. Min. 65.6 [+2.7]
Mean      75.1 [+3.2]
24-hour corrected mean: 74.5
Max. for month: 93F on the 20th, 30th
Min. for month: 58F on the 1st, 23rd

COOLING DEGREE DAYS
Total cooling units:   322 [+100]
Total for the season:  411 [+60]
Total for last season: 455

PRECIPITATION, Inches
Total: 5.46 [+1.44]
Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed: 8.8
Avg. corrected wind speed:   9.6
Prevailing wind direction: W at 14%
Peak gust and direction: 44 W on 17th

SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes:   N/A

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, scattered cirrus,
few cumulus in all directions
Temperature: 71F; Dew Point: 67F; Wind: WNW at 5 kts,
Wind: Light
Sea-level pressure: 29.90 ins. Hg, falling then rising
Visibility: 45 miles
6-hr Max temp: 71F
6-hr Min temp: 67F
24-hr Precip: 0.00 ins.
BHO SA 1155 160 SCT 250 SCT 45 124/71/64/2905/990/
FEW CU ALQDS WND LGT/ 8/172 50006 10071 20067

10 A.M.
Weather: Scattered altocumulus, scattered cirrus,
few cumulus in all directions
Temperature: 81F; Dew Point: 63F; Wind: WNW at 5 kts,
Wind: Light
Sea-level pressure: 29.91 ins. Hg, rising steadily
Visibility: 45 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 160 SCT 250 SCT 45 127/81/63/3005/991/
FEW CU ALQDS WND LGT/ 8/172 50003

1 P.M.
Weather: Scattered cumulus, scattered cirrostratus
Temperature: 80F; Dew Point: 67F; Wind: NE at 7 kts
Sea-level pressure: 29.89 ins. Hg, falling steadily
Visibility: 40 miles
6-hr Max temp: 83F
6-hr Min temp: 71F
6-hr Precip: 0.00 ins.
BHO SA 1755 50 SCT 250 SCT 40 121/80/67/0507/989/
8/205 56006 10083 20071

SUMMARY FOR SATURDAY, AUGUST 3, 2019

TEMPERATURE (DEGREES F)
MAX…..84   NORMAL…..81
MIN…..66   NORMAL…..63
MEAN….75   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL…………………+3
TOTAL DEPARTURE FOR THE MONTH…………………+6 [+1.8 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..10   DEPARTURE………+3
TOTAL COOLING UNITS FOR THE MONTH…………..27   DEPARTURE………+5
TOTAL COOLING UNITS FOR THE SEASON…………438   DEPARTURE……..+65
TOTAL COOLING UNITS LAST SEASON TO DATE…….498   DEPARTURE……..-60

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..25 SW  AT  2:07 P.M.
AERO…………………….26 SW  AT  1:24 P.M.
ASOS…………………….26 SSW AT  1:46 P.M.
DAVIS……………………25 SW  AT 11:36 A.M. RMY 25
FASTEST MILE FOR YESTERDAY………………….18 SW  AT 11:42 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18 SSW AT  3:38 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………18 SW  AT 11:43 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..11.7 SW
ASOS…………………..12.1
DAVIS………………….11.2 SW [218 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……….0.00  DEPARTURE……-0.45
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE YEAR……….35.33  DEPARTURE……+3.89
ASOS………….35.28

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 83/58/71/+1/0.00/896/98               21 NNW AERO 21 NNW RMY N/A
07/02 82/65/74/+4/0.00/329/36               23 W   AERO 23 W   RMY 23
07/03 89/67/78/+7/0.00/866/95               18 S   AERO 18 S   RMY 18
07/04 88/68/78/+7/0.00/748/82               17 SSW AERO M  M   RMY 17
07/05 87/69/78/+7/0.00/829/91               21 SW  AERO M  M   RMY 21
07/06 90/71/81/+10/0.83/646/71              26 WNW AERO M  M   RMY N/A
07/07 78/64/71/0/0.00/827/91                30 NE  AERO M  M   RMY N/A
07/08 79/59/69/-3/0.00/763/84               16 N   AERO 18 SSW RMY N/A
07/09 85/61/73/+1/0.00/871/96               18 NW  AERO 16 NW  RMY 18
07/10 88/69/79/+7/0.00/607/67               20 ESE AERO 16 ESE RMY 17
07/11 81/67/74/+2/0.62/000/00               35 S   AERO 33 S   RMY 36
07/12 84/68/76/+4/0.00/316/35               31 WNW AERO 30 WNW RMY 32
07/13 85/65/75/+3/0.00/812/90               21 W   AERO 20 WSW RMY 20
07/14 87/68/78/+6/0.00/702/78               25 W   AERO 21 W   RMY 23
07/15 82/63/73/+1/0.00/791/88               24 WNW AERO 23 WNW RMY 22
07/16 86/65/76/+4/0.00/682/76               23 W   AERO 21 W   RMY 21
07/17 90/70/80/+8/1.32/…/..               44 W   AERO M  M   RMY 47
07/18 72/61/67/-5/0.04/…/..               33 NE  AERO 36 NE  RMY 33
07/19 89/61/75/+3/0.00/…/..               24 WSW AERO 26 SW  RMY 25
07/20 93/75/84/+12/0.00/…/..              21 WSW AERO 22 WSW RMY N/A
07/21 92/76/84/+12/0.00/…/..              31 W   AERO 35 W   RMY 31
07/22 81/64/73/+1/…./…/..               35 ENE AERO 37 ENE RMY 34
07/23 66/58/62/-10/…./…/..              30 NNE AERO 33 NNE RMY 30
07/24 77/60/69/-3/0.00/…/..               14 NE  AERO 15 NE  RMY N/A
07/25 80/61/71/-1/0.00/…/..            17 SSE AERO 23 N   RMY 17
07/26 84/62/73/+1/0.00/…/..               22 SSE AERO 23 SSE RMY 20
07/27 83/64/74/+2/0.00/…/..               21 S   AERO 23 S   RMY 21
07/28 89/64/77/+5/0.00/…/..               25 WSW AERO 36 WSW RMY 26
07/29 89/71/80/+8/…./…/..               23 W   AERO 25 W   RMY 21
07/30 93/71/82/+10/0.00/…/..              24 S   AERO 24 S   RMY 23
07/31 90/68/79/+7/0.55/…/..               37 SW  AERO 35 SW  RMY 38

DAILY RECORDS FOR JULY 2019

7/20/19: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 75F,
BREAKS PREVIOUS RECORD OF 73F SET IN 1977, 2015

7/21/19: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 76F,
BREAKS PREVIOUS RECORD OF 75F SET IN 1991

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

8/01   84/66/75/3/0.00/…/..                18 NNW AERO 20 NW  RMY 17
8/02   83/61/72/0/0.00/…/..                18 WSW AERO 18 WSW RMY 18
8/03   84/66/75/+3/0.00/…/..               25 SW  AERO 26 SW  RMY 25

8/04 Low temp since midnight is 61F; normal low is 63F

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

RECORDS FOR AUGUST 4
HIGH 95F IN 1928
LOW 48F IN 1900
PRECIP 1.68 INS IN 1983
PEAK GUST 48 MPH SW IN 1974

RECORDS FOR AUGUST 5
HIGH 98F IN 1955
LOW 48F IN 1929,1972
PRECIP 3.03 INCHES IN 1893
PEAK GUST 60e MPH SW 1977

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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