Saturday, July 24, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SATURDAY, JULY 24, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0429E
SUNSET: 1912E
A COOLER DAY WITH MOSTLY CLEAR SKIES AND
GOOD VISIBILITY….
Today we observed mostly clear skies save a few cumulus
that seemed to be building slightly at the 1 P.M.
observation. Visibility was a good 70 miles, which is
higher than usual for this time of summer. Wind is on the
lighter side, but has shifted from NW to E over the course
of the day. The daily highest speed as of yet is 15 mph.
The high so far today is 79F, 3 degrees below the daily
normal maximum of 82F. The low so far today is 59F, which is
5 degrees below the daily normal minimum of 64F.
———————————————–
Today’s Observations:
7 A.M.
Weather: Clear
Temperature: 65F; Dew Point: 57F; Relative Humidity: 74%
Wind: SSW @ 8 kts
Sea-level pressure: 30.09 in. Hg; rising steadily
Visibility: 70 miles, thin smoke layer
6-hr Max temp: 65F
6-hr Min temp: 59F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 70 191/65/57/2008/009/ THN K LYR ALQDS/
53006 10065 20059
10 A.M.
Weather: Clear, few cumulus E-NW
Temperature: 73F; Dew Point: 58F; Relative Humidity: 59%
Wind: SSW @ 6 kts, wind light
Sea-level pressure: 30.11 in Hg; rising, then steady
Visibility: 70 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 70 199/73/58/2006/011/ FEW CU E-NW WND LGT/
8/100 53008
1 P.M.
Weather: Clear, few cumulus E-N
Temperature: 77F, Dew point: 53F; Relative Humidity: 44%
Wind: ENE @ 6 kts, wind light
Sea-level pressure: 30.08 in Hg; Falling, then falling more rapidly
Visibility: 70 miles
6-hr Max temp: 77F
6-hr Min temp: 65F
6-hr Precip: 0.00 ins.
BHO SA 1755 CLR 70 190/77/53/0706/008/ FEW CU E-N WND LGT/ 8/100
58009 10077 20065
SUMMARY FOR FRIDAY, JULY 23, 2021
TEMPERATURE (DEGREES F)
MAX…….79 NORMAL…..82
MIN…….62 NORMAL…..64
MEAN……71 NORMAL…..73
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-2
TOTAL DEPARTURE FOR THE MONTH…………………-86 [-3.9 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH……………26 DEPARTURE…….+21
TOTAL HEATING UNITS FOR THE SEASON…………..26 DEPARTURE…….+21
TOTAL HEATING UNITS LAST SEASON TO DATE……….1 DEPARTURE…….+25
COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….6 DEPARTURE……..-3
TOTAL COOLING UNITS FOR THE MONTH…………..114 DEPARTURE…….-67
TOTAL COOLING UNITS FOR THE SEASON………….340 DEPARTURE…….+20
TOTAL COOLING UNITS LAST SEASON TO DATE……..370 DEPARTURE…….-30
PEAK WIND GUST (MPH):
Official……………….22 S @ 6:08 P.M.
AEROVANE (south tower)…..21 S @ 6:08 P.M.
VECTOR #2 (south tower)….23 @ 6:08 P.M.
DAVIS #2 (south tower)…..23 S @ 6:08 P.M.
ASOS………..OUT OF SERVICE D/T RENOVATIONS
VECTOR #1……OUT OF SERVICE D/T RENOVATIONS
DAVIS #1…….OUT OF SERVICE D/T RENOVATIONS
RMY…………OUT OF SERVICE D/T RENOVATIONS
MERLIN………OUT OF SERVICE D/T RENOVATIONS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 S @ 6:08 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15 @ 6:05 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 S @ 6:05 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE…….OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE..OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE RMY AVERAGE……..OUT OF SERVICE D/T RENOVATIONS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…… 6.8 NW [163 total miles] VECTOR #2……………. 7.6
DAVIS #2…………….. 7.2 NNW
RMY……………..OUT OF SERVICE D/T RENOVATIONS
ASOS…………….OUT OF SERVICE D/T RENOVATIONS
VECTOR #1………..OUT OF SERVICE D/T RENOVATIONS
DAVIS #1…………OUT OF SERVICE D/T RENOVATIONS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00 DEPARTURE….-0.11
TOTAL PRECIPITATION FOR THE MONTH…………10.68 DEPARTURE….+8.13
TOTAL PRECIPITATION FOR THE YEAR………….34.06 DEPARTURE….+4.54
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 80/65/73/+2/0.74/155/17 22 W AERO 20 WSW RMY 21
07/02 65/55/60/-11/1.49/000/00 37 NE AERO 36 NE RMY 39
07/03 56/54/55/-17/1.98/000/00 41 NE AERO 44 NE RMY 45 TSTM
07/04 66/54/60/-12/0.16/191/21 26 ENE AERO 23 ENE RMY 26
07/05 74/53/64/-8/0.01/546/60 26 SSW AERO 28 SSW RMY 27
07/06 87/66/77/+5/0.26/255/28 37 W AERO 48 W RMY 38 TSTM
07/07 88/88/77/+5/0.77/699/77 63 NW AERO 75 NW RMY 70 TSTM
07/08 67/59/63/-9/0.38/109/12 46 W AERO 46 W RMY 51 TSTM
07/09 73/62/68/-5/3.02/163/18 40 WNW AERO 44 WNW RMY 43
07/10 71/63/67/-6/0.07/109/12 23 NE AERO 21 NNE RMY 22
07/11 81/61/71/-2/T/325/36 21 SW AERO 19 S RMY N/A
07/12 67/61/64/-9/1.01/000/00 31 ENE AERO 31 ENE RMY N/A
07/13 66/60/63/-10/0.02/000/00 19 E AERO 18 E RMY N/A
07/14 80/62/71/-2/0.01/…/.. 19 S AERO 18 S RMY N/A
07/15 88/67/78/+5/0.00/…/.. 19 WSW AERO 18 SSW RMY N/A
07/16 90/70/80/+7/0.04/…/.. 36 NNW AERO 39 NNW RMY N/A TSTM
07/17 78/64/71/-2/0.34/…/.. 26 ENE AERO 25 ENE RMY N/A TSTM
07/18 74/63/69/-4/0.15/…/.. 22 NE AERO 22 NE RMY N/A TSTM
07/19 71/63/67/-6/0.07/…/.. 17 ENE AERO 17 ENE RMY N/A
07/20 83/64/74/+1/0.00/…/.. 23 NW AERO 23 NW RMY N/A
07/21 79/62/71/-2/…./…/.. 26 NNW AERO 23 NNW RMY N/A TSTM
07/22 79/58/69/-4/…./…/.. 20 WNW AERO 20 WNW RMY N/A TSTM
07/23 79/62/71/-2/…./…/.. 22 S AERO 21 S RMY N/A TSTM
07/24 The low since midnight is 59F, the daily normal low is 64F
RECORDS FOR JULY:
JULY 2: Record daily precipitation of 1.49″,
Surpasses previous record of 1.42″ set in 1986
JULY 3: Record daily precipitation of 1.98″,
Surpasses previous record of 1.36″ set in 1985
JULY 7: Record peak gust of 63 MPH,
Surpasses previous record of 55 MPH set in 1989
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
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
RECORDS FOR JULY 25
HIGH 96F IN 2016
LOW 51F IN 1901,1953
PRECIP 2.25 INS IN 1990
PEAK GUST 88 MPH NW IN 1972
TODAY’S REPORT PREPARED BY: Benjamin Turner
