Saturday, August 17, 2019
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, AUGUST 17, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME
OVERCAST AND MUGGY WITH LIGHT SHOWERS IN THE AREA
THIS AFTERNOON…
The sky has remained covered in low clouds into early
afternoon today after an early morning fog lifted from
the summit. With the dew point in the upper 60’s to 70
degrees it has been muggy all day, and the visibility
has increased slowly from 1-2 miles after sunrise to
25-30 miles this afternoon. A very light rain shower
began just before the 1 PM observation and continued
for a little over an hour.
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: 5.45 [+1.43]
Greatest in 24 hrs: 2.08 on the 22nd-23rd
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: Sky obscured in fog
Temperature: 68F; Dew Point: 67F; Wind: S at 2 kts (estimated),
Wind: Light
Sea-level pressure: 30.09 ins. Hg, falling then rising, now higher
Visibility: 2 miles, fog, visibility increasing
6-hr Max temp: 68F
6-hr Min temp: 67F
24-hr Precip: 0.00 ins.
BHO SA 1155 W2 X 2F 189/68/67/1702E/009/ VSBY INCR WND LGT/
8//// 53002 10068 20067
10 A.M.
Weather: Overcast stratocumulus
Temperature: 71F; Dew Point: 68F; Wind: ESE at 2 kts (estimated),
Wind: Light
Sea-level pressure: 30.09 ins. Hg, falling slightly
Visibility: 20 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 E20 OVC 20 188/71/68/1502E/009/ VSBY N-NE 10
SSW-SW 30 HAZY WND LGT/ 8/5// 56001
1 P.M.
Weather: Light rain shower, broken stratocumulus,
overcast nimbostratus, few lower stratocumulus, fog bank
offshore distant NE-ENE, precipitation very light
Temperature: 76F; Dew Point: 70F; Wind: SE at 4 kts
Wind: Light
Sea-level pressure: 30.07 ins. Hg, falling, then more quickly
Visibility: 30 miles, visibility 35 miles SE-SW and 15 miles to
the NE-ENE due to offshore fog
6-hr Max temp: 76F
6-hr Min temp: 68F
6-hr Precip: Trace
BHO SA 1755 E25 BKN 35 OVC 30RW- 184/76/70/1304/007/ FEW LWR SC
VSBY NE-ENE 15 SE-SW 35 FG BNK OFFSHR DSNT NE-ENE HAZY PCPN VRY LGT
WND LGT/ 8/52/ 58004 10076 20068
SUMMARY FOR FRIDAY, AUGUST 16, 2019
TEMPERATURE (DEGREES F)
MAX…..78 NORMAL…..79
MIN…..61 NORMAL…..62
MEAN….70 NORMAL…..71
DEPARTURE FROM 30-YEAR NORMAL………………….-1
TOTAL DEPARTURE FOR THE MONTH………………….+2 [-0.1 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………5 DEPARTURE………-1
TOTAL COOLING UNITS FOR THE MONTH………….107 DEPARTURE………-2
TOTAL COOLING UNITS FOR THE SEASON…………518 DEPARTURE……..+58
TOTAL COOLING UNITS LAST SEASON TO DATE…….643 DEPARTURE…….-125
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..20 E AT 5:13 P.M.*
AERO…………………….17 ESE AT 3:12 P.M.
ASOS…………………….20 ESE AT 3:23 P.M.
DAVIS……………………19 E AT 3:11 P.M. RMY 18
FASTEST MILE FOR YESTERDAY………………….14 ENE AT 3:10 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….15 E AT 3:13 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………16 E AT 3:12 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..7.7 E
ASOS…………………..7.2
DAVIS………………….7.4 ESE [114 deg.]
* Last of several occurrences.
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00 DEPARTURE……-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.82 DEPARTURE……-1.42
ASOS…………..0.82
TOTAL PRECIPITATION FOR THE YEAR……….36.14 DEPARTURE……+2.91
ASOS………….36.10
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 TSTM
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 TSTM
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/+1/1.22/284/32 35 ENE AERO 37 ENE RMY 34
07/23 66/58/62/-10/0.86/009/01 30 NNE AERO 33 NNE RMY 30
07/24 77/60/69/-3/0.01/575/65 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 TSTM
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/+3/0.00/755/87 18 NNW AERO 20 NW RMY 17
8/02 83/61/72/0/0.00/804/93 18 WSW AERO 18 WSW RMY 18
8/03 84/66/75/+3/0.00/302/35 25 SW AERO 26 SW RMY 25
8/04 83/66/75/+3/0.00/732/85 21 NE AERO 23 SW RMY 25
8/05 81/58/70/-2/0.00/842/98 20 S AERO 18 S RMY 19
8/06 79/63/71/-1/0.00/282/33 15 S AERO 14 S RMY 17
8/07 82/66/74/+2/…./367/43 32 SSW AERO 35 SSW RMY 35
8/08 84/67/76/+4/…./588/69 30 SW AERO 24 WNW RMY 29
8/09 82/63/73/+1/…./815/96 28 NW AERO 25 NW RMY 26
8/10 78/59/69/-2/…./669/79 32 NW AERO 28 NW RMY 28
8/11 78/55/67/-4/0.00/…/.. 28 W AERO 25 W RMY 28
8/12 82/60/71/0/0.00/…/.. 25 W AERO 23 W RMY 26
8/13 77/66/72/+1/0.02/…/.. 25 W AERO 24 WSW RMY 24
8/14 75/62/69/-2/…./…/.. 24 ENE AERO 22 ENE RMY 22
8/15 77/59/68/-3/…./…/.. 17 ESE AERO 15 SSE RMY 16
8/16 78/61/70/-1/…./../.. 20 E AERO 17 ESE RMY 18
8/17 Low temp since midnight is 67F; normal low is 62F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR AUGUST 17
HIGH 97F IN 1944
LOW 48F IN 1902
PRECIP 2.17 INCHES IN 1998
PEAK GUST 50e MPH SSW IN 1952, 50 MPH WNW IN 1962
RECORDS FOR AUGUST 18
HIGH 93F IN 2002
LOW 47F IN 1824
PRECIP 5.75 INCHES IN 1955 [DIANE]
PEAK GUST 46 MPH WNW IN 2007
TODAY’S REPORT PREPARED BY: Mike Iacono
