Wednesday, July 28, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, JULY 28, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0433E
SUNSET: 1908E
COOLER WITH MOSTLY CLOUDY SKIES AND DECENT
VISIBILITY….
Today we observed mostly cloudy skies in the morning,
moving to partly cloudy in the afternoon hours.
Visibility reached 65 miles today at the 10 A.M.
observation following some rain showers that left
0.05 inches after 7 A.M. Passing thunderstorms overnight
left 0.57 inches, which compares lower to areas in the
north that recieved over an inch.
The high so far today is 72F, 10 degrees below the daily
normal maximum of 82F. The low so far today is 62F, which
is 2 degrees belw the daily normal minimum of 64F.
———————————————–
Today’s Observations:
7 A.M.
Weather: Broken stratocumulus, break in overcast ENE
Temperature: 64F; Dew Point: 62F; Relative Humidity: 95%
Wind: NNE @ 8 kts
Sea-level pressure: 30.00 in. Hg; steady then rising
Visibility: 25 miles, thin fog
6-hr Max temp: 65F
6-hr Min temp: 62F
24-hr Precip: 0.57 ins.
BHO SA 1155 10 BKN 25 160/64/62/0308/000/ BINOVC ENE THN F
ALQDS/ 8/800 52011 70057 10065 20062
10 A.M.
Weather: Overcast stratocumulus
Temperature: 63F; Dew Point: 62F; Relative Humidity: 97%
Wind: NE @ 6 kts
Sea-level pressure: 30.04 in Hg; rising then more rapidly
Visibility: 65 miles
3-hr Precip: 0.05 ins.
BHO SA 1455 E65 OVC 65 172/63/62/0406/004/ 8/5// 51012 6005/
1 P.M.
Weather: Broken cumulus and stratocumulus, broken altostratus
Temperature: 72F, Dew point: 62F; Relative Humidity: 71%
Wind: ENE @ 7 kts
Sea-level pressure: 30.04 in Hg; rising then falling
Visibility: 50 miles
6-hr Max temp: 72F
6-hr Min temp: 61F
6-hr Precip: 0.05 ins.
BHO SA 1755 30 BKN 65 BKN 50 172/72/62/0707/004/ 8/810 55000
6005/ 10072 20061
SUMMARY FOR TUESDAY, JULY 27, 2021
TEMPERATURE (DEGREES F)
MAX…….87 NORMAL…..82
MIN…….65 NORMAL…..64
MEAN……76 NORMAL…..73
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+3
TOTAL DEPARTURE FOR THE MONTH…………………-88 [-3.5 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…….+20
TOTAL HEATING UNITS FOR THE SEASON…………..26 DEPARTURE…….+20
TOTAL HEATING UNITS LAST SEASON TO DATE……….1 DEPARTURE…….+25
COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY……………11 DEPARTURE……..+3
TOTAL COOLING UNITS FOR THE MONTH…………..144 DEPARTURE…….-71
TOTAL COOLING UNITS FOR THE SEASON………….370 DEPARTURE…….+16
TOTAL COOLING UNITS LAST SEASON TO DATE……..426 DEPARTURE…….-56
PEAK WIND GUST (MPH):
Official……………….55 NW @ 6:27 P.M.
AEROVANE (south tower)…..58 NW @ 6:28 P.M.
VECTOR #2 (south tower)….62 @ 6:27 P.M.
DAVIS #2 (south tower)…..53 NW @ 6:28 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………………37 NW @ 6:27 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..38 @ 6:28 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………38 WNW @ 6:29 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…… 7.9 WNW [190 total miles] VECTOR #2……………. 8.9
DAVIS #2…………….. 8.7 WNW
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…….0.57 DEPARTURE….+0.45
TOTAL PRECIPITATION FOR THE MONTH…………11.34 DEPARTURE….+8.34
TOTAL PRECIPITATION FOR THE YEAR………….34.72 DEPARTURE….+4.75
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/-2/0.01/216/24 19 S AERO 18 S RMY N/A
07/15 88/67/78/+5/0.00/844/94 19 WSW AERO 18 SSW RMY N/A
07/16 90/70/80/+7/0.04/609/68 36 NNW AERO 39 NNW RMY N/A TSTM
07/17 78/64/71/-2/0.34/394/44 26 ENE AERO 25 ENE RMY N/A TSTM
07/18 74/63/69/-4/0.15/000/00 22 NE AERO 22 NE RMY N/A TSTM
07/19 71/63/67/-6/0.07/027/03 17 ENE AERO 17 ENE RMY N/A
07/20 83/64/74/+1/0.00/730/82 23 NW AERO 23 NW RMY N/A
07/21 79/62/71/-2/0.16/577/65 26 NNW AERO 23 NNW RMY N/A TSTM
07/22 79/58/69/-4/T/656/74 20 WNW AERO 20 WNW RMY N/A
07/23 79/62/71/-2/0.00/708/80 22 S AERO 21 S RMY N/A TSTM
07/24 78/59/69/-4/0.00/830/94 19 S AERO 18 S RMY N/A
07/25 71/64/68/-5/0.08/009/01 40 SSW AERO 41 SSW RMY N/A
07/26 87/67/77/+4/0.01/765/87 27 WSW AERO 25 WNW RMY N/A
07/27 87/65/76/+3/…./…/.. 55 NW AERO 58 NW RMY N/A
07/28 The low since midnight is 62F, 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 28
HIGH 97F IN 1931
LOW 49F IN 1903
PRECIP 3.32 INS IN 1911
PEAK GUST 62 MPH SW IN 2006
RECORDS FOR JULY 29
HIGH 97F IN 1949
LOW 53F IN 1888,1914
PRECIP 1.53 INS IN 1901
PEAK GUST 40e MPH E IN 1941
TODAY’S REPORT PREPARED BY: Benjamin Turner
