Friday, June 11, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
FRIDAY, JUNE 11, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0407E
SUNSET: 1921E
COOL WITH CONSIDERABLE CLOUDINESS…
We are experiencing temperatures in the mid-
to upper-60s. This is a large scale change from
earlier this week when we recorded our first
heat wave of 2021! Also of contrast are the dew
points. We observed very muggy conditions earlier
in the week thanks to values in the upper 60s and
low 70s. Today, we find them around 40F with
afternoon readings in the low-50s!
Average visibility is decent at around 65 miles.
Winds are notably light from the northeast under
a good deal of mid-level clouds.
On an interesting note, yesterday we finally squeezed
out our first blue square with a -3F departure! Monthly
departure, however, remains an impressive +8.7F!
The high so far today is 70F, which is 4 degrees
below the normal high of 74F. The low since midnight
is 51F, which is 5 degrees below the daily normal
low of 56F.
PRELIMINARY STATS FOR MAY 2021
TEMPERATURE, Deg. F
Avg. Max. 68.1 [+1.8]Avg. Min. 48.0 [+0.2]Mean 58.1 [+1.0]24-hour corrected mean: 57.7
Max. for month: 87F on the 22nd, 23rd
Min. for month: 38F on the 1st
HEATING DEGREE DAYS
Total heating units: 237 [-31]Total for the season: 5578 [-725]Total for last season: 5812
PRECIPITATION, Inches
Total: 5.60 [+1.49]Greatest in 24 hrs: N/A
WIND, mph
Avg. uncorrected wind speed: 10.9 mph
Avg. corrected wind speed: 11.4 mph
Prevailing wind direction: WNW [16%]Peak gust and direction: 44 ENE on the 29th
SUNSHINE:
Campbell-Stokes card minutes: 14478 minutes of a possible 26226 or 55%
Astronomical total minutes: 14977 minutes of a possible 27188 or 55%
Today’s Observations:
7 A.M.
Weather: Broken Altocumulus/Altostratus
Temperature: 56F; Dew Point: 41F; Relative Humidity: 57%
Wind: ESE @ 7kts
Sea-level pressure: 30.09 in. Hg; rising, then falling
Visibility: 70 miles
6-hr Max temp: 56F
6-hr Min temp: 51F
24-hr Precip: 0.00 ins.
BHO SA 1155 180 BKN 70 191/56/41/1207/009/ 8/050 58006 10056 20051
10 A.M.
Weather: Broken Altocumulus/Altostratus
Temperature: 65F; Dew Point: 41F; Relative Humidity: 41%
Wind: ESE @ 3kts (wind light)
Sea-level pressure: 30.07 in Hg; falling, then falling more rapidly
Visibility: 65 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 90 BKN 65 183/65/41/1103/007/ WND LGT/ 8/050 58008
1 P.M.
Weather: Broken Altocumulus/Altostratus
Temperature: 66F, Dew point: 51F; Relative Humidity: 59%
Wind: NNE @ 5 kts (wind light)
Sea-level pressure: 30.01 in Hg; falling, then falling more rapidly
Visibility: 65 miles
6-hr Max temp: 70F
6-hr Min temp: 56F
6-hr Precip: 0.00 ins.
BHO SA 1455 90 BKN 65 163/66/51/0305/001/ WND LGT/ 8/050 58020 10070 20056
SUMMARY FOR THURSDAY, JUNE 10, 2021
TEMPERATURE (DEGREES F)
MAX…….70 NORMAL…..73
MIN…….53 NORMAL…..56
MEAN……62 NORMAL…..65
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……..-3
TOTAL DEPARTURE FOR THE MONTH……………….+89 [+8.7 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL THRU JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………… 3 DEPARTURE……..0
TOTAL HEATING UNITS FOR THE MONTH…………… 6 DEPARTURE……-34
TOTAL HEATING UNITS FOR THE SEASON…………5584 DEPARTURE…..-759
TOTAL HEATING UNITS LAST SEASON TO DATE…….5836 DEPARTURE…..-252
COOLING DEGREE DAYS (SEASON JAN THRU DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………….0 DEPARTURE…….-3
TOTAL COOLING UNITS FOR THE MONTH……………77 DEPARTURE……+56
TOTAL COOLING UNITS FOR THE SEASON………….106 DEPARTURE……+61
TOTAL COOLING UNITS LAST SEASON TO DATE………63 DEPARTURE……+43
PEAK WIND GUST (MPH):
420C/Official…………..28 NE @ 9:24 A.M.
AEROVANE (south tower)…..28 NE @ 9:24 A.M.
ASOS…………………..27 NE @ 9:24 A.M.
DAVIS #1……………….27 NE @ 9:24 A.M.
DAVIS #2 (south tower)…..28 ENE @ 9:24 A.M.
RMY……………………28 @ 9:23 A.M.
VECTOR…………………31 @ 9:23 A.M.
MERLIN…………………27
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 ENE @ 9:04 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18 NE @ 9:30 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………19 ENE @ 9:30 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 ENE @ 10:02 A.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..17 E @ 9:05 A.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..17 @ 9:27 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……10.3 ENE [246 total miles] ASOS…………………10.6
DAVIS #1……………..10.8 E
DAVIS #2……………..10.9 E
RMY………………….10.1 ESE
VECTOR……………….10.5
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00 DEPARTURE….-0.16
ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….0.11 DEPARTURE….-1.54
ASOS………….0.08
TOTAL PRECIPITATION FOR THE YEAR………….20.77 DEPARTURE….-3.54
ASOS………..20.94
PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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
05/01 62/38/50/-3/0.06/0.0/659/78 31 WNW AERO 35 WNW RMY 40
05/02 76/48/62/+9/0.01/0.0/220/26 41 SW AERO 41 SW RMY 46
05/03 67/48/58/+5/0.07/0.0/400/47 21 E AERO 20 E RMY 20
05/04 50/44/47/-7/0.78/0.0/000/00 36 NNE AERO 32 NNE RMY 37
05/05 48/44/46/-8/0.47/0.0/000/00 18 ESE AERO 14 ESE RMY 17
05/06 64/45/55/+1/0.00/0.0/780/91 33 NW AERO 38 NNW RMY 39
05/07 61/43/52/-3/0.00/0.0/516/60 28 ESE AERO 22 ESE RMY 26
05/08 54/40/47/-8/0.00/0.0/069/08 24 SSW AERO 23 SSW RMY 25
05/09 66/42/54/-1/T/0.0/579/67 30 SW AERO 29 SW RMY 34
05/10 60/45/53/-2/0.39/0.0/078/09 21 W AERO 20 W RMY 20
05/11 63/45/54/-2/0.00/0.0/764/88 38 WNW AERO 41 WNW RMY 41
05/12 65/41/53/-3/0.00/0.0/722/83 28 NW AERO M M RMY 31
05/13 69/45/57/+1/0.00/0.0/759/87 22 WNW AERO 21 WNW RMY 21
05/14 76/49/63/+8/0.00/0.0/725/83 23 WNW AERO 23 WNW RMY 25
05/15 75/55/65/+8/0.01/0.0/569/65 24 SSE AERO 26 SSE RMY 26
05/16 78/54/66/+9/0.01/0.0/483/55 36 W AERO 37 W RMY 42
05/17 77/52/65/+8/0.00/0.0/722/82 20 SSW AERO 21 SSW RMY 21
05/18 81/54/68/+10/T/0.0/600/68 32 W AERO 30 W RMY 32
05/19 75/55/65/+7/0.00/0.0/778/88 25 NE AERO 23 NNE RMY 27
05/20 75/52/64/+6/0.00/0.0/842/95 18 ESE AERO 18 ESE RMY 19
05/21 78/50/64/+5/T/0.0/524/59 23 S AERO 22 S RMY 26
05/22 87/56/72/+13/T/0.0/285/32 25 WNW AERO 21 WNW RMY 24
05/23 87/58/73/+14/T/0.0/687/77 38 NNW AERO 37 NNW RMY 40
05/24 70/49/60/+1/0.00/0.0/839/94 30 S AERO 35 S RMY 33
05/25 75/47/61/+1/0.00/0.0/761/85 31 SW AERO 35 SW RMY 34
05/26 86/57/72/+12/0.21/0.0/736/82 30 S AERO 36 S RMY 35 TSTM
05/27 79/57/68/+8/0.02/0.0/691/77 25 N AERO 25 WNW RMY 27
05/28 58/43/51/-10/1.00/0.0/162/18 28 ENE AERO 32 ENE RMY 27
05/29 46/42/44/-17/1.50/0.0/000/00 44 ENE AERO 47 ENE RMY 50
05/30 46/45/46/-15/0.87/0.0/000/00 37 NE AERO 40 NE RMY 40
05/31 57/46/52/-9/0.20/0.0/027/03 22 NNE AERO 25 WNW RMY 25
RECORDS FOR THE MONTH:
Low maximum on the 30th of 46F, beating the old record of
51F set in 1996
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/…/.. 20 WSW AERO 24 WSW RMY 22
06/02 80/55/68/+6/0.00/…/.. 28 S AERO 25 S RMY 28
06/03 73/56/65/+3/0.01/…/.. 29 SSW AERO 29 SSW RMY 29
06/04 77/61/69/+6/0.02/…/.. 23 SW AERO 25 WSW RMY 25 TSTM
06/05 87/60/74/+11/0.00/…/.. 32 SSW AERO 37 SSW RMY 35
06/06 91/69/80/+17/0.00/…/.. 30 WSW AERO 31 WSW RMY 32
06/07 92/69/81/+17/0.00/…/.. 31 SSW AERO 35 SSW RMY 34
06/08 92/69/81/+17/…./…/.. 24 WSW AERO 25 WSW RMY 27
06/09 88/70/79/+15/…./…/.. 21 N AERO 23 NNW RMY 23
06/10 70/53/62/-3/0.00/…/.. 28 NE AERO 28 NE RMY 28
06/11 The low since midnight is 51F, the daily normal low is 56F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR JUNE 11
HIGH 92F IN 1973, 1984, 1997
LOW 40F IN 1972
PRECIP 2.66 INCHES IN 1922
PEAK GUST 43e MPH S IN 1945
RECORDS FOR JUNE 12
HIGH 94F IN 2017
LOW 40F IN 1906
PRECIP 1.79 INS 1955
PEAK GUST 58 MPH NW IN 1991
TODAY’S REPORT PREPARED BY: Andrew Swanson
