Saturday, July 10, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SATURDAY, JULY 10, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0417E
SUNSET: 1922E
OVERCAST WITH A COOL BREEZE FOLLOWING A DAY OF
RECORD RAINFALL….
Today we measured an additional 2.89 inches of rainfall for the
24 hours ending at 7 AM this morning, partly due to Tropical Storm
Elsa yesterday. This amount brings the monthly total to 8.88 inches,
7.90 inches above the current average through the 9th. Drought fears
are a distant memory, as the yearly total of 32.26 inches exceeds the
normal by almost 4 and a half inches. The peak wind gust during Elsa
was 40 mph from the WNW at 2:54 PM EST after the center of the storm
passed to the asst.
Today we observed overcast skies with a limited visibility of 30 miles.
While cool, humidity remains a factor with dew points in the upper 50’s.
A steady northeast wind persists with an average speed of 10 mph and a
gust of 21 mph.
Here’s some more context for the tropical rain yesterday including
the list of most rainfall on July 9th and the list of wettest calendar
days in July. Only one other day on these lists appears to have been
from a tropical cyclone.
BHO Highest July 9 Precipitation, inches (1885-2021):
1) 3.74 on July 9, 1921
2) 3.02 on July 9, 2021
3) 1.37 on July 9, 1964
4) 1.17 on July 9, 1962
5) 1.10 on July 9, 1895
6) 0.92 on July 9, 1930
BHO Highest July Calendar Day Precipitation, inches (1885-2021):
1) 4.46 on July 1, 1915
2) 4.01 on July 27, 1979
3) 3.74 on July 9, 1921
4) 3.54 on July 13, 1996 [T.S. Bertha]5) 3.32 on July 28, 1911
6) 3.14 on July 13, 1898
7) 3.02 on July 9, 2021 [T.S. Elsa]8) 2.92 on July 27, 1988
~via BHO Chief Scientist Mike Iacono
The high so far today is 70F, 12 degrees below the daily average
of 82F. The low so far today is 60F, 4 degrees below the daily
average of 64F.
———————————————–
PRELIMINARY STATS FOR JUNE 2021
TEMPERATURE, Deg. F
Avg. Max. 80.9 [+5.9]Avg. Min. 60.4 [+3.3]Mean 70.7 [+4.6]24-hour corrected mean: 70.0
Max. for month: 95F on the 29th
Min. for month: 50F on the 1st
HEATING DEGREE DAYS
Total heating units: 19 [-54]Total for the season: 5597 [-725]Total for last season: 5852
COOLING DEGREE DAYS
Total cooling units: 197 [+92]Total for the season: 226 [+97]Total for last season: 184
PRECIPITATION, Inches
Total: 2.72 [-1.59]Greatest in 24 hrs: 0.68 inches on the 22nd
WIND, mph
Avg. uncorrected wind speed: 10.4 mph
Avg. corrected wind speed: 10.9 mph
Prevailing wind direction: SSW [22%]Peak gust and direction: 51 NW on the 30th
SUNSHINE:
Campbell-Stokes card minutes: 16230 minutes of a possible 26376 or 62%
Astronomical total minutes: 16866 minutes of a possible 27415 or 62%
Today’s Observations:
7 A.M.
Weather: Scattered stratocumulus, broken altocumulus
Temperature: 66F; Dew Point: 64F; Relative Humidity: 93%
Wind: NE @ 05G12kts
Sea-level pressure: 29.98 in. Hg; rising, then more rapidly
Visibility: 20 miles, thin fog
6-hr Max temp: 69F
6-hr Min temp: 64F
24-hr Precip: 2.89 ins.
BHO SA 1155 30 SCT 90 BKN 20 152/66/64/0505G12/998/ BINOVC THN F ALQDS/
8/870 70289 51014 10069 20064
10 A.M.
Weather: Scattered stratocumulus, overcast altocumulus
Temperature: 65F; Dew Point: 59F; Relative Humidity: 80%
Wind: ENE @ 10G19 kts
Sea-level pressure: 30.01 in Hg; rising steadily
Visibility: 30 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 30 SCT 90 OVC 30 162/65/59/0610G19/001/ HAZY/ 8/870 53010
1 P.M.
Weather: Overcast stratocumulus
Temperature: 69F, Dew point: 57F; Relative Humidity: 65%
Wind: ENE @ 6G14 kts
Sea-level pressure: 30.02 in Hg; falling steadily
Visibility: 35 miles, hazy
6-hr Max temp: 71F
6-hr Min temp: 65F
6-hr Precip: 0.00 ins.
BHO SA 1755 30 OVC 35 165/69/57/0606G14/002/ HAZY/ 8/8// 53003 10071
20065
SUMMARY FOR FRIDAY, JULY 9, 2021
TEMPERATURE (DEGREES F)
MAX…….73 NORMAL…..82
MIN…….62 NORMAL…..64
MEAN……68 NORMAL…..73
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-5
TOTAL DEPARTURE FOR THE MONTH…………………-50 [-5.8 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……………23 DEPARTURE…….+20
TOTAL HEATING UNITS FOR THE SEASON…………..23 DEPARTURE…….+20
TOTAL HEATING UNITS LAST SEASON TO DATE……….0 DEPARTURE…….+23
COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….3 DEPARTURE…….-5
TOTAL COOLING UNITS FOR THE MONTH……………35 DEPARTURE……-30
TOTAL COOLING UNITS FOR THE SEASON………….261 DEPARTURE……+57
TOTAL COOLING UNITS LAST SEASON TO DATE……..243 DEPARTURE……+18
PEAK WIND GUST (MPH):
420C/Official…………..40 WNW @ 2:54 P.M.
VECTOR #1………………42 @ 2:53 P.M.
RMY……………………43 @ 2:46 P.M.
MERLIN…………………38
AEROVANE (south tower)…..44 WNW @ 3:03 P.M.
VECTOR #2 (south tower)….42 @ 3:18 P.M.
DAVIS #1……………….37 WNW @ 2:37 P.M.
DAVIS #2 (south tower)…..37 W @ 2:37 P.M.
ASOS………..OUT OF SERVICE D/T RENOVATIONS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………28 NW @ 2:54 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..26 @ 2:58 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..25 NNW @ 3:03 P.M
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..28 @ 2:43 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………28 WNW @ 2:39 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE…….OUT OF SERVICE D/T RENOVATIONS MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………27 NW @ 2:39 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……12.0 ESE [288 total miles] VECTOR #1…………….12.5
DAVIS #1……………..12.5
DAVIS #2……………..14.0
RMY………………….11.5 NW
ASOS…………………OUT OF SERVICE D/T RENOVATIONS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….2.89 DEPARTURE….+2.78
TOTAL PRECIPITATION FOR THE MONTH………….8.88 DEPARTURE….+7.90
TOTAL PRECIPITATION FOR THE YEAR………….32.26 DEPARTURE….+4.31
PRELIMINARY CLIMATE SUMMARY FOR JUNE 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
06/01 74/50/62/0/0.00/425/47 20 WSW AERO 24 WSW RMY 22
06/02 80/55/68/+6/0.00/553/61 28 S AERO 25 S RMY 28
06/03 73/56/65/+3/0.01/073/08 29 SSW AERO 29 SSW RMY 29
06/04 77/61/69/+6/0.02/054/06 23 SW AERO 25 WSW RMY 25 TSTM
06/05 87/60/74/+11/0.00/801/88 32 SSW AERO 37 SSW RMY 35
06/06 91/69/80/+17/0.00/819/90 30 WSW AERO 31 WSW RMY 32
06/07 92/69/81/+17/0.00/838/92 31 SSW AERO 35 SSW RMY 34
06/08 92/69/81/+17/0.06/456/50 24 WSW AERO 25 WSW RMY 27 TSTM
06/09 88/70/79/+15/0.02/530/58 21 N AERO 23 NNW RMY 23
06/10 70/53/62/-3/0.00/795/87 28 NE AERO 28 NE RMY 28
06/11 70/51/61/-4/0.13/411/45 21 SSE AERO 22 SSE RMY 22
06/12 72/53/63/-2/0.43/430/47 20 WSW AERO 18 WSW RMY 20
06/13 82/56/69/+4/0.00/860/94 26 SSW AERO 29 SSW RMY 29
06/14 65/56/61/-5/0.63/027/03 28 S AERO 30 SSE RMY 29
06/15 77/61/69/+3/T/357/39 18 NE AERO 20 NE RMY 18 TSTM
06/16 73/56/65/-1/0.00/769/84 27 NNW AERO 31 NNW RMY 27
06/17 77/52/65/-2/0.00/880/96 21 WNW AERO 21 NW RMY 23
06/18 82/56/69/+2/T/789/86 26 WSW AERO 28 WSW RMY 30
06/19 86/63/75/+8/0.09/504/55 30 SW AERO 32 SW RMY 32
06/20 85/63/74/+6/0.00/816/89 24 S AERO 25 SSW RMY 25
06/21 83/65/74/+6/0.00/514/56 37 SSW AERO 39 SSW RMY 39
06/22 84/58/71/+3/0.68/229/25 30 NW AERO 31 NW RMY 31 TSTM
06/23 73/52/63/-5/0.00/807/88 25 NW AERO 24 NW RMY 26
06/24 76/58/67/-2/T/899/98 25 SE AERO 24 SE RMY 25
06/25 71/57/64/-5/0.11/046/05 23 S AERO 23 S RMY 23
06/26 81/61/71/+2/0.00/376/41 36 SSW AERO 37 SSW RMY 38
06/27 85/70/78/+9/0.00/476/52 38 SW AERO 39 SW RMY 42
06/28 93/70/82/+12/0.00/851/93 28 SW AERO 28 SW RMY 28
06/29 95/73/84/+14/T/750/82 26 W AERO 30 W RMY 27 TSTM
06/30 94/69/82/+12/0.54/731/80 51 NW AERO 53 NW RMY 56 TSTM
RECORDS FOR JUNE:
JUNE 7: Record high minimum temperature of 69F,
Surpasses previous record of 66F set in 1922 and 1953
JUNE 29: Record high maximum temperature of 95F,
Surpasses previous record of 94F set in 1933
JUNE 29: Record high minimum temperature of 73F,
Surpasses previous record of 71F set in 1999
JUNE 30: Record high maximum temperature of 94F,
Ties previous record of 94F set in 1964
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/…/.. 22 W AERO 20 WSW RMY 21
07/02 65/55/60/-11/1.49/…/.. 37 NE AERO 36 NE RMY 39
07/03 56/54/55/-17/1.98/…/.. 41 NE AERO 44 NE RMY 45 TSTM
07/04 66/54/60/-12/0.16/…/.. 26 ENE AERO 23 ENE RMY 26
07/05 74/53/64/-8/0.01/…/.. 26 SSW AERO 28 SSW RMY 27
07/06 87/66/77/+5/0.26/…/.. 37 W AERO 48 W RMY 38 TSTM
07/07 88/88/77/+5/0.77/…/.. 63 NW AERO 75 NW RMY 70 TSTM
07/08 67/59/63/-9/0.38/…/.. 46 W AERO 46 W RMY 51
07/09 73/62/68/-5/3.02/…/.. 40 WNW AERO 44 WNW RMY 43
07/10 The low since midnight is 64F, 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 10
HIGH 99F IN 1911
LOW 46F IN 1890
PRECIP 1.95 INS IN 2015
WIND 75 MPH W IN 1985
RECORDS FOR JULY 11
HIGH 98F IN 1911
LOW 49F IN 1890
PRECIP 1.87 INS IN 1959
WIND 53 MPH NW IN 1988
TODAY’S REPORT PREPARED BY: Benjamin Turner
