Friday, June 4, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
FRIDAY, JUNE 4, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0409E
SUNSET: 1917E
CLOUDY AND STICKY ATOP GREAT BLUE HILL…
Skies have been fairly busy today with all cloud
layers visible. The high altitude overcast is thin
enough to allow for some dim sun. The considerable
cloudiness has capped our temperatures to the mid-70s
so far. We have yet to see these clouds precipitate any
liquid locally, however some distant virga was spotted
at the 1PM observation as a line of storms approach.
Visibility is very limited – at most 30 miles. An
increase in dew points to the mid-60s combined
with seasonal pollen is making for a very hazy sight.
The upcoming weather headline will be the heat and
humidity over the next 5 days. Upon inspection
of recent guidance, Blue Hill may record its first
heat wave of 2021…a good idea to ensure those
A/C window units are installed by this evening!
The high so far today is 76F, which is 4 degrees
above the normal high of 72F. The low since midnight
is 62F, which is 8 degrees above the daily normal
low of 54F.
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 Altostratus, (thin) Overcast Cirrostratus
(few cumulus all quads, sun dimly visible)
Temperature: 68F; Dew Point: 65F; Relative Humidity: 90%
Wind: SW @ 11 kts
Sea-level pressure: 29.91 in. Hg; falling, then rising
Visibility: 30 miles (hazy)
6-hr Max temp: 68F
6-hr Min temp: 62F
24-hr Precip: 0.01 ins.
BHO SA 1155 140 BKN 240 -OVC 30 127/68/65/2211/991/
FEW CU ALQDS SUN DMLY VSBL HAZY/ 8/012 53004 70001
10068 20062
10 A.M.
Weather: Broken Cumulus, Broken Altostratus, (thin) Overcast Cirrus
(sun dimly visible)
Temperature: 71F; Dew Point: 65F; Relative Humidity: 81%
Wind: WSW @ 8G16 kts
Sea-level pressure: 29.91 in Hg; rising, then steady
Visibility: 30 miles (hazy)
3-hr Precip: 0.00 ins.
BHO SA 1455 25 BKN 140 BKN 220 -OVC 30 128/71/65/248G16/991/
SUN DMLY VSBL HAZY/ 8/112 51001
1 P.M.
Weather: Scattered Cumulus, Broken Altostratus, (thin) Overcast Cirrus
(virga distant SW-NW, sun dimly visible)
Temperature: 76F, Dew point: 64F; Relative Humidity: 67%
Wind: WSW @ 8 kts
Sea-level pressure: 29.87 in Hg; falling, then falling more rapidly
Visibility: 25 miles, hazy
6-hr Max temp: 76F
6-hr Min temp: 68F
6-hr Precip: 0.00 ins.
BHO SA 1755 22 SCT 140 BKN 250 -OVC 25 115/76/64/2408/987/VIRGA DSNT SW-NW
SUN DMLY VSBL HAZY/ 8/212 58013 10076 20068
SUMMARY FOR THURSDAY, JUNE 3, 2021
TEMPERATURE (DEGREES F)
MAX…….73 NORMAL…..71
MIN…….56 NORMAL…..53
MEAN……65 NORMAL…..62
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL…….+3
TOTAL DEPARTURE FOR THE MONTH……………….+9 [+2.8 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL THRU JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………… 0 DEPARTURE…… -4
TOTAL HEATING UNITS FOR THE MONTH…………… 3 DEPARTURE……-11
TOTAL HEATING UNITS FOR THE SEASON…………5581 DEPARTURE…..-736
TOTAL HEATING UNITS LAST SEASON TO DATE…….5830 DEPARTURE…..-249
COOLING DEGREE DAYS (SEASON JAN THRU DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………… 0 DEPARTURE…….-2
TOTAL COOLING UNITS FOR THE MONTH…………… 3 DEPARTURE…….-2
TOTAL COOLING UNITS FOR THE SEASON…………..32 DEPARTURE…….+3
TOTAL COOLING UNITS LAST SEASON TO DATE………34 DEPARTURE…….-2
PEAK WIND GUST (MPH):
420C/Official…………..29 SSW @ 1:04 P.M.
AEROVANE (south tower)…..29 SSW @ 5:14 P.M.
ASOS…………………..28 SSW @ 1:04 P.M.
DAVIS #1……………….29 N @ 1:04 P.M.
DAVIS #2 (south tower)…..30 SSE @ 12:58 P.M.
RMY……………………29 @ 5:14 P.M.
VECTOR…………………31 @ 5:14 P.M.
MERLIN…………………28
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………21 S @ 12:17 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 SSW @ 3:42 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 WNW @ 3:32 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 S @ 12:18 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..20 SSW @ 3:30 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..20 @ 3:29 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……11.3 SSW [272 total miles] ASOS…………………11.7
DAVIS #1……………..10.7 SSW
DAVIS #2……………..12.2 SSW
RMY………………….11.3 SSW
VECTOR……………….11.7
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.01 DEPARTURE….-0.16
ASOS………….0.01
TOTAL PRECIPITATION FOR THE MONTH………….0.01 DEPARTURE….-0.48
ASOS………….0.01
TOTAL PRECIPITATION FOR THE YEAR………….20.67 DEPARTURE….-2.48
ASOS………..20.87
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 The low since midnight is 62F, the daily normal low is 54F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR JUNE 4
HIGH 99F IN 1919 [Record for month]LOW 41F IN 1915,1926
PRECIP 1.52 INS IN 2007
PEAK GUST 48 MPH SSE IN 1983
RECORDS FOR JUNE 5
HIGH 95F IN 1930
LOW 41F IN 1891
PRECIP 2.83 INS IN 1982
PEAK GUST 57 MPH NNW IN 1988
TODAY’S REPORT PREPARED BY: Andrew Swanson
