Tuesday, June 15, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
TUESDAY, JUNE 15, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0407E
SUNSET: 1923E
CONSIDERABLY CLOUDY AND HUMID WITH SCATTERED SHOWERS
DEVELOPING EARLY THIS AFTERNOON…
Total rainfall from yesterday’s showers amounted to
0.63″! A surprise, but definitely welcomed water for
area lawns and flowers.
Today has been a mostly cloudy day with early morning
stratus and fog lifting to reveal more convectively
natured cumulus clouds. Some of these cumulus have
grown into towering cumulus and even cumulonimbus
early this afternoon. As a matter of fact a couple
of them along with their associated rain showers were
passing to the NE through S of the Observatory at the
1 P.M. observation.
A couple of very light rain showers have reached the
hill as well, giving us a trace of rain through 1 P.M.
The humidity level has definitely been elevated today
as confirmed by dew points in the mid 60s.
Winds have once again been on the light side. We have
certainly seen a lot of light wind days of late. The
average speed since 7 A.M. is only around 3mph! The
peak gust so far today came back in the wee hours of
the morning, measuring only 15mph.
The high so far today is 76F, which is 1 degree above
the normal high of 75F. The low since midnight is 63F,
which is 6 degrees above the daily normal low of 57F.
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: Sky obscured, vertical visibility 300ft, stratus fractus
drifting over summit
Temperature: 63F; Dew Point: 63F; Relative Humidity: 100%
Wind: SSE @ 4 kts, wind light
Sea-level pressure: 29.77 in. Hg; falling then rising
Visibility: 3/4 mile, fog, 2 miles NW-N
6-hr Max temp: 63F
6-hr Min temp: 63F
24-hr Precip: 0.63 ins.
BHO SA 1155 X W3 3/4F 082/63/63/1604/977/ STFRA DRFTG OVR SMT
VSBY 2 NW-N RW-B05E19 WND LGT/ 8/6// 53004 6000/ 70063 10063 20063
10 A.M.
Weather: Broken stratocumulus, broken cumulus, overcast cirrocumulus,
few breaks in overcast all quadrants
Temperature: 69F; Dew Point: 65F; Relative Humidity: 87%
Wind: S @ 4kts, wind light
Sea-level pressure: 29.75 in Hg; falling then rising
Visibility: 20, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 E12 BKN 25 BKN 180 OVC 20 074/69/65/1704/975/
FEW BINOVC ALQDS HAZY WND LGT/ 8/809 55008
1 P.M.
Weather: Scattered stratocumulus, broken moderate cumulus,
broken altocumulus castellanus, cumulonimbus NE-S moving NE
Temperature: 74F, Dew point: 63F; Relative Humidity: 69%
Wind: WSW @ 5 kts, wind light and variable
Sea-level pressure: 29.72 in Hg; falling, then more rapidly
Visibility: 30 miles, 10 NE-E, 5 SSE-S, hazy
6-hr Max temp: 76F
6-hr Min temp: 63F
6-hr Precip: Trace
BHO SA 1755 E20 SCT 30 BKN 90 BKN 30 066/74/63/2405/972/
CB NE-S MVG NE RW NE-S MVG NE VSBY 10 NE-E, 5 SSE-S
RW-B45E53 HAZY WND L/V/ 8/380 58008 6000/ 10076 20063
SUMMARY FOR MONDAY, JUNE 14, 2021
TEMPERATURE (DEGREES F)
MAX…….65 NORMAL…..75
MIN…….56 NORMAL…..57
MEAN……61 NORMAL…..66
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……..-5
TOTAL DEPARTURE FOR THE MONTH……………….+82 [+5.7 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL THRU JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………… 4 DEPARTURE…….+1
TOTAL HEATING UNITS FOR THE MONTH……………16 DEPARTURE……-35
TOTAL HEATING UNITS FOR THE SEASON…………5594 DEPARTURE…..-760
TOTAL HEATING UNITS LAST SEASON TO DATE…….5846 DEPARTURE…..-252
COOLING DEGREE DAYS (SEASON JAN THRU DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………….0 DEPARTURE…….-3
TOTAL COOLING UNITS FOR THE MONTH……………81 DEPARTURE……+48
TOTAL COOLING UNITS FOR THE SEASON………….110 DEPARTURE……+53
TOTAL COOLING UNITS LAST SEASON TO DATE………74 DEPARTURE……+36
PEAK WIND GUST (MPH):
420C/Official…………..28 S @ 12:27 P.M.
AEROVANE (south tower)…..30 SSE @ 12:23 P.M.
ASOS…………………..28 S @ 12:27 P.M.
VECTOR…………………29 @ 12:25 P.M.
DAVIS #1……………….29 S @ 1:04 P.M.
DAVIS #2 (south tower)…..34 SSE @ 12:21 P.M.
RMY……………………29 @ 12:25 P.M.
MERLIN…………………26
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………20 S @ 12:30 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18 S @ 12:30 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..20 @ 12:27 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………19 S @ 12:28 P.M
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………24 S @ 12:29 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..19 S @ 12:27 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……10.2 SSE [245 total miles] ASOS…………………10.0
VECTOR………………. N/A
DAVIS #1…………….. 9.8 S
DAVIS #2……………..11.2 S
RMY…………………. N/A
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.63 DEPARTURE….+0.48
ASOS………….0.63
TOTAL PRECIPITATION FOR THE MONTH………….1.30 DEPARTURE….-0.98
ASOS………….1.25
TOTAL PRECIPITATION FOR THE YEAR………….21.96 DEPARTURE….-2.98
ASOS………..22.11
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 74/50/62/0/0.00/425/47 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/+17/0.00/519/57 31 SSW AERO 35 SSW RMY 34
06/08 92/69/81/+17/0.06/…/.. 24 WSW AERO 25 WSW RMY 27 TSTM
06/09 88/70/79/+15/0.02/…/.. 21 N AERO 23 NNW RMY 23
06/10 70/53/62/-3/0.00/…/.. 28 NE AERO 28 NE RMY 28
06/11 70/51/61/-4/0.13/…/.. 21 SSE AERO 22 SSE RMY 22
06/12 72/53/63/-2/0.43/…/.. 20 WSW AERO 18 WSW RMY 20
06/13 82/56/69/+4/0.00/…/.. 26 SSW AERO 29 SSW RMY 29
06/14 65/56/61/-5/0.63/…/.. 28 S AERO 30 SSE RMY 29
06/15 The low since midnight is 63F, the daily normal low is 57F
RECORDS FOR THE MONTH:
High minimum on the 7th of 69F, beating the old record of
66F set in 1922 and 1953.
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR JUNE 15
HIGH 94F IN 1988
LOW 42F IN 1959, 1978
PRECIP 2.04 INS IN 1903
PEAK GUST 52 MPH SW IN 1972
RECORDS FOR JUNE 16
HIGH 92F IN 1891
LOW 44F IN 1926
PRECIP 2.17 INS IN 1931
PEAK GUST 55 MPH W IN 1958
TODAY’S REPORT PREPARED BY: Matt Douglas
