Saturday, July 20, 2019
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JULY 20, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME
HOT, HAZY, AND MOSTLY CLOUDY WITH
A STEADY WESTERLY WIND….
We observed mostly cloudy skies and a
significant haze, bringing visibility down
to 20 miles by the 1 P.M. observation. There
has been a steady wind throughout the day,
coming in from the west at around 10 mph. The
high so far today is 91F, which is 10 degrees
higher than the average daily maximum of 81F.
The record high maximum temperature for this
date is 99F in 1991. The low since midnight
is 75F, 12 degrees above the daily normal
minimum of 63F.
Today’s Observations:
7 A.M.
Weather: Broken cirrostratus
Temperature: 80F; Dew Point: 74F; Wind: W at 10 kts
Sea-level pressure: 29.83 ins. Hg, rising steadily
Visibility: 25 miles, hazy
6-hr Max temp: 80F
6-hr Min temp: 75F
24-hr Precip: 0.00 ins.
BHO SA 1155 E250 BKN 25 103/80/74/2710/983/ HAZY/ 8/008
51016 10080 20075
10 A.M.
Weather: Broken cirrostratus
Temperature: 88F; Dew Point: 74F; Wind: WSW at 7 kts
Sea-level pressure: 29.82 ins. Hg, rising then falling
Visibility: 25 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 E250 BKN 25 100/88/74/3007/982/ HAZY/ 8/008
56003
1 P.M.
Weather: Scattered cumulus, broken cirrostratus
Temperature: 90F; Dew Point: 75F; Wind: W at 9 kts
Sea-level pressure: 29.79 ins. Hg, falling steadily
Visibility: 20 miles, hazy
6-hr Max temp: 91F
6-hr Min temp: 80F
6-hr Precip: 0.00 ins.
BHO SA 1755 45 SCT E250 BKN 20 092/90/75/2709/979/ HAZY/
8/208 58008 10091 20080
SUMMARY FOR FRIDAY, JULY 19, 2019
TEMPERATURE (DEGREES F)
MAX…..89 NORMAL…..81
MIN…..61 NORMAL…..63
MEAN….75 NORMAL…..72
DEPARTURE FROM 30-YEAR NORMAL………………….+3
TOTAL DEPARTURE FOR THE MONTH…………………+67 [+3.3 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..10 DEPARTURE………+2
TOTAL COOLING UNITS FOR THE MONTH………….191 DEPARTURE……..+61
TOTAL COOLING UNITS FOR THE SEASON…………280 DEPARTURE……..+21
TOTAL COOLING UNITS LAST SEASON TO DATE…….335 DEPARTURE……..-55
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..24 WSW AT 3:47 P.M.
AERO…………………….26 SW AT 12:54 P.M.
ASOS…………………….24 SW AT 3:47 P.M.
DAVIS……………………25 WSW AT 3:43 P.M. RMY 25
FASTEST MILE FOR YESTERDAY………………….17 WSW AT 5:16 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….17 SW AT 5:13 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………17 WSW AT 3:49 P.M.
AVERAGE WIND SPEED AND DIRECTION……………..8.0 SW
ASOS……………………..8.6
DAVIS…………………….8.3 WSW [249 deg.]
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……….2.81 DEPARTURE……+0.47
ASOS…………..2.82
TOTAL PRECIPITATION FOR THE YEAR……….32.68 DEPARTURE……+3.37
ASOS………….32.50
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/…/.. 21 NNW AERO 21 NNW RMY N/A
07/02 82/65/74/+4/0.00/…/.. 23 W AERO 23 W RMY 23
07/03 89/67/78/+7/0.00/…/.. 18 S AERO 18 S RMY 18
07/04 88/68/78/+7/0.00/…/.. 17 SSW AERO M M RMY 17
07/05 87/69/78/+7/0.00/…/.. 21 SW AERO M M RMY 21
07/06 90/71/81/+10/0.83/…/.. 26 WNW AERO M M RMY N/A
07/07 78/64/71/0/0.00/…/.. 30 NE AERO M M RMY N/A
07/08 79/59/69/-3/0.00/…/.. 16 N AERO 18 SSW RMY N/A
07/09 85/61/73/+1/0.00/…/.. 18 NW AERO 16 NW RMY 18
07/10 88/69/79/+7/0.00/…/.. 20 ESE AERO 16 ESE RMY 17
07/11 81/67/74/+2/0.62/…/.. 35 S AERO 33 S RMY 36
07/12 84/68/76/+4/0.00/…/.. 31 WNW AERO 30 WNW RMY 32
07/13 85/65/75/+3/0.00/…/.. 21 W AERO 20 WSW RMY 20
07/14 87/68/78/+6/0.00/…/.. 25 W AERO 21 W RMY 23
07/15 82/63/73/+1/0.00/…/.. 24 WNW AERO 23 WNW RMY 22
07/16 86/65/76/+4/0.00/…/.. 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/…./…/.. 33 NE AERO 36 NE RMY 33
07/19 89/61/75/+3/0.00/…/.. 24 WSW AERO 26 SW RMY 25
07/20 Low temp since midnight is 75F; normal low is 63F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR JULY 20
HIGH 99F IN 1991
LOW 47F IN 1890
PRECIP 1.64 INS IN 1938
WIND 56e MPH SSW IN 1943
RECORDS FOR JULY 21
HIGH 100F IN 1977 [RECORD FOR MONTH]
LOW 48F IN 1890
PRECIP 2.09 INS IN 1938
PEAK GUST 60e MPH WNW IN 1977
TODAY’S REPORT PREPARED BY: Benjamin Turner
