Tuesday, August 6, 2019

| August 6, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, AUGUST 6, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

A FOGGY AND HUMID MORNING WITH INCREASING
CLOUDS IN THE AFTERNOON….

Fog this morning limited visibility to 1 mile, and
only receded slightly as the day went on. Maximum
visibility seen today is 25 miles at the 1 P.M.
observation. Wind today was incredibly light, becoming
calm in the afternoon. Skies became overcast around
noon today in conjunction with a temperature drop
of 4 degrees starting around 11 A.M. The high so far
today is 79F, 2 degrees below the daily normal maximum
of 81F. The low since midnight is 63F, the same as the
average daily minimum.

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: 18300 minutes of possible 26682 or 69%
Astronomical total minutes: 19049 minutes of possible 27759 or 69%

Today’s Observations:

7 A.M.
Weather: Broken cirrostratus
Temperature: 67F; Dew Point: 66F; Wind: S at 5 kts,
Wind: Light
Sea-level pressure: 29.96 ins. Hg, falling then rising
Visibility: 1 mile, fog
6-hr Max temp: 67F
6-hr Min temp: 63F
24-hr Precip: 0.00 ins.
BHO SA 1155 E250 BKN 1F 145/67/66/1805/996/ WND LGT/
8/008 51002 10067 20063

10 A.M.
Weather: Broken cumulus
Temperature: 77F; Dew Point: 65F; Wind: SE at 3 kts,
Wind: Light and variable
Sea-level pressure: 29.94 ins. Hg, falling steadily
Visibility: 20 miles, distant fog
3-hr Precip: 0.00 ins.
BHO SA 1455 E40 BKN 20 138/77/65/1403/994/ DSNT FG
ALQDS WND L/V/ 8/200 56007

1 P.M.
Weather: Overcast altostratus, few cumulus
Temperature: 75F; Dew Point: 68F; Wind: Calm
Sea-level pressure: 29.90 ins. Hg, falling steadily
Visibility: 25 miles, distant fog
6-hr Max temp: 79F
6-hr Min temp: 67F
6-hr Precip: 0.00 ins.
BHO SA 1755 E160 OVC 25 125/75/68/0000/990/ FEW CU DSNT
FG ALQDS WND CALM/ 8/22/ 58013 10079 20067

SUMMARY FOR MONDAY, AUGUST 5, 2019

TEMPERATURE (DEGREES F)
MAX…..81   NORMAL…..81
MIN…..58   NORMAL…..63
MEAN….70   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL…………………-2
TOTAL DEPARTURE FOR THE MONTH………………….7 [+1.2 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………5   DEPARTURE………-2
TOTAL COOLING UNITS FOR THE MONTH…………..42   DEPARTURE………+6
TOTAL COOLING UNITS FOR THE SEASON…………453   DEPARTURE……..+66
TOTAL COOLING UNITS LAST SEASON TO DATE…….522   DEPARTURE……..-69

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..20 S   AT  7:58 P.M.
AERO…………………….18 S   AT  7:59 P.M.
ASOS…………………….20 S   AT  7:59 P.M.
DAVIS……………………20 S   AT  7:59 P.M. RMY 19
FASTEST MILE FOR YESTERDAY………………….14 S   AT  7:46 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….14 S   AT  9:19 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………14 S   AT  7:45 P.M.
AVERAGE WIND SPEED AND DIRECTION……………7.0 W
ASOS……………………6.8
DAVIS…………………..7.1 WNW [283 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……-0.75
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE YEAR……….35.33  DEPARTURE……+3.59
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/+8/1.32/260/29               44 W   AERO M  M   RMY 47
07/18 72/61/67/-5/0.04/000/00               33 NE  AERO 36 NE  RMY 33
07/19 89/61/75/+3/0.00/580/65               24 WSW AERO 26 SW  RMY 25
07/20 93/75/84/+12/0.00/802/90              21 WSW AERO 22 WSW RMY N/A
07/21 92/76/84/+12/0.00/729/82              31 W   AERO 35 W   RMY 31
07/22 81/64/73/+1/…./284/32               35 ENE AERO 37 ENE RMY 34
07/23 66/58/62/-10/…./009/01              30 NNE AERO 33 NNE RMY 30
07/24 77/60/69/-3/0.00/575/65               14 NE  AERO 15 NE  RMY N/A
07/25 80/61/71/-1/0.00/732/83            17 SSE AERO 23 N   RMY 17
07/26 84/62/73/+1/0.00/730/83               22 SSE AERO 23 SSE RMY 20
07/27 83/64/74/+2/0.00/834/95               21 S   AERO 23 S   RMY 21
07/28 89/64/77/+5/0.00/710/81               25 WSW AERO 36 WSW RMY 26
07/29 89/71/80/+8/0.01/804/92               23 W   AERO 25 W   RMY 21
07/30 93/71/82/+10/0.00/767/88              24 S   AERO 24 S   RMY 23
07/31 90/68/79/+7/0.55/548/63               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   83/66/75/+3/0.00/…/..               21 NE  AERO 23 SW  RMY 25
8/05   81/58/70/-2/0.00/…/..               20 S   AERO 18 S   RMY 19

8/06 Low temp since midnight is 63F; normal low is 63F

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

RECORDS FOR AUGUST 6
HIGH 95F IN 1931
LOW 48F IN 1934
PRECIP 1.47 INCHES IN 1995
PEAK GUST 44e MPH SSW IN 1940

RECORDS FOR AUGUST 7
HIGH 95F IN 1924
LOW 51F IN 2004
PRECIP 3.32 INCHES IN 1926
PEAK GUST 51 MPH NE 1975

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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