Saturday, July 31, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SATURDAY, JULY 31, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0435E
SUNSET: 1906E
AN INCREDIBLE AUTUMN-LIKE DAY TO END OFF JULY….
Today was nothing less than an absolute pick. Visibility was
80 miles with very few clouds in the sky, and temps barely
exceeded 70F. A consistent westerly breeze was another feature
of the day, bringing dryer and cooler air into the region. Dew
points stayed in the low 50’s, yielding great weekend hiking
weather.
For a bit of perspective, current weather conditions are normal
for early to mid fall!
With today being the end of the current month, let’s dive into
precipitation. The monthly total is 11.59″ which is only 0.09″
from breaking the all-time wettest July on record here. The only
foreseeable opportunity to surpass this milestone is a very slim
chance of a passing shower this afternoon.
BHO Wettest Julys, inches (1885-2021)
1) 11.67 in 1938
2) 10.68 in 1988
3) 10.43 in 1921
4) 9.52 in 1915
5) 8.47 in 1889
6) 7.62 in 2009
7) 7.55 in 1916
The high so far today is 73F, 9 degrees below the daily
normal maximum of 82F. The low so far today is 52F, which
is 12 degrees below the daily normal minimum of 64F.
———————————————–
Today’s Observations:
7 A.M.
Weather: Scattered altocumulus and cirrus
Temperature: 68F; Dew Point: 47F; Relative Humidity: 67%
Wind: NW @ 9G16 kts
Sea-level pressure: 29.94 in. Hg; rising, then more rapidly
Visibility: 80 miles
6-hr Max temp: 58F
6-hr Min temp: 52F
24-hr Precip: 0.00 ins.
BHO SA 1155 100 SCT 250 SCT 80 140/68/47/3109G16/994/ 8/081 51012
10058 20052
10 A.M.
Weather: Clear, few altocumulus and cirrus
Temperature: 66F; Dew Point: 50F; Relative Humidity: 56%
Wind: WNW @ 7G16 kts
Sea-level pressure: 29.94 in Hg; falling, then rising
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 80 141/66/50/3007G16/994/ FEW AC/CI ALQDS/
8/081 51001
1 P.M.
Weather: Scattered Cumulus
Temperature: 70F, Dew point: 50F; Relative Humidity: %
Wind: NW @ 6G15 kts
Sea-level pressure: 29.92 in Hg; falling steadily
Visibility: 80 miles
6-hr Max temp: 73F
6-hr Min temp: 58F
6-hr Precip: 0.00 ins.
BHO SA 1755 50 SCT 80 136/70/50/3106G15/992/ 8/100 58005
10073 20058
SUMMARY FOR FRIDAY, JULY 30, 2021
TEMPERATURE (DEGREES F)
MAX…….78 NORMAL…..82
MIN…….58 NORMAL…..64
MEAN……68 NORMAL…..73
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-5
TOTAL DEPARTURE FOR THE MONTH…………………-103 [-3.6 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…………….3 DEPARTURE……..-5
TOTAL COOLING UNITS FOR THE MONTH…………..153 DEPARTURE…….-87
TOTAL COOLING UNITS FOR THE SEASON………….379 DEPARTURE………0
TOTAL COOLING UNITS LAST SEASON TO DATE……..475 DEPARTURE…….-86
PEAK WIND GUST (MPH):
Official……………….31 NW @ 2:08 P.M.
AEROVANE (south tower)…..31 NW @ 2:22 P.M.
VECTOR #2 (south tower)….32 @ 2:08 P.M.
DAVIS #2 (south tower)…..29 NW @ 12:08 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………………23 NW @ 2:08 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..21 @ 4:12 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………21 NW @ 4:21 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……12.0 NW [288 total miles] VECTOR #2…………….12.6
DAVIS #2……………..12.4 NW
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….-0.12
TOTAL PRECIPITATION FOR THE MONTH…………11.59 DEPARTURE….+8.24
TOTAL PRECIPITATION FOR THE YEAR………….34.97 DEPARTURE….+4.65
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/+3/0.56/…/.. 55 NW AERO 58 NW RMY N/A
07/28 72/61/67/-6/0.06/…/.. 18 NNE AERO 18 NNE RMY N/A
07/29 77/61/69/-4/0.19/…/… 39 S AERO 40 S RMY N/A
07/30 78/58/68/-5/0.01/…/.. 31 NW AERO 31 NW RMY N/A
07/31 The low since midnight is 52F, 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 31
HIGH 95F IN 1917
LOW 50F IN 1895
PRECIP 1.34 INS IN 1892
PEAK GUST 43e MPH WNW SW IN 1953, 43 SW IN 1971
RECORDS FOR AUGUST 1
HIGH 97F IN 1917
LOW 49F IN 1891
PRECIP 3.61 INCHES IN 1927
PEAK GUST 41 MPH NNW IN 1985
TODAY’S REPORT PREPARED BY: Benjamin Turner
