Saturday, June 12, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SATURDAY, JUNE 12, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0407E
SUNSET: 1922E
A STEADY RAINFALL OVERNIGHT, GRADUAL CLEARING TODAY…
An area of showers moved through the region overnight
last night into this morning. Rainfall totaled 0.56″,
which was much needed as the month has been dry so far.
The rain ended this morning, but clouds have been slow
to break. Some sun has finally been seen late this
morning into early this afternoon.
The wind has been very light so far today, only
averaging around 2 mph since 7 A.M., and no that’s
not a typo, only 2 mph!!! The peak gust so far today
has been under 10 mph.
Visibility has been decent today averaging about 60-65
miles.
The high so far today is 69F, which is 5 degrees below
the normal high of 74F. The low since midnight is 53F,
which is 3 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: Sky partially obsured, overcast nimbostratus, light rain showers
Temperature: 56F; Dew Point: 55F; Relative Humidity: 97%
Wind: W @ 3kts, wind light
Sea-level pressure: 29.91 in. Hg; falling, then rising
Visibility: 1/8 mile, fog
6-hr Max temp: 57F
6-hr Min temp: 53F
24-hr Precip: 0.56 ins.
BHO SA 1155 -X E80 OVC 1/8RW-F 127/56/55/2603/991/ PCPN VRY LGT
WND LGT/ 8/62/ 55002 6043/ 70056 10057 20053
10 A.M.
Weather: Broken stratus fractus, overcast stratocumulus
Temperature: 59F; Dew Point: 57F; Relative Humidity: 93%
Wind: NW @ 2kts, wind light
Sea-level pressure: 29.91 in Hg; falling, then rising
Visibility: 60 miles
3-hr Precip: Trace
BHO SA 1455 E20 BKN 50 OVC 60 129/59/57/3102/991/ WND LGT/
8/7// 53002 6000/
1 P.M.
Weather: Broken cumulus/stratocumulus, thin broken cirrus
Temperature: 69F, Dew point: 56F; Relative Humidity: 64%
Wind: NNW @ 2 kts, wind light and variable
Sea-level pressure: 29.88 in Hg; falling, then more rapidly
Visibility: 65 miles
6-hr Max temp: 69F
6-hr Min temp: 56F
6-hr Precip: Trace
BHO SA 1755 E50 BKN 250 -BKN 65 120/69/56/3302/988/ WND L/V/
8/201 58009 6000/ 10069 20056
SUMMARY FOR FRIDAY, JUNE 11, 2021
TEMPERATURE (DEGREES F)
MAX…….70 NORMAL…..74
MIN…….53 NORMAL…..56
MEAN……61 NORMAL…..65
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……..-4
TOTAL DEPARTURE FOR THE MONTH……………….+85 [+7.5 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL THRU JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………… 4 DEPARTURE…….+1
TOTAL HEATING UNITS FOR THE MONTH……………10 DEPARTURE……-33
TOTAL HEATING UNITS FOR THE SEASON…………5588 DEPARTURE…..-758
TOTAL HEATING UNITS LAST SEASON TO DATE…….5836 DEPARTURE…..-248
COOLING DEGREE DAYS (SEASON JAN THRU DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………….0 DEPARTURE…….-3
TOTAL COOLING UNITS FOR THE MONTH……………77 DEPARTURE……+53
TOTAL COOLING UNITS FOR THE SEASON………….106 DEPARTURE……+58
TOTAL COOLING UNITS LAST SEASON TO DATE………66 DEPARTURE……+40
PEAK WIND GUST (MPH):
420C/Official…………..21 SSE @ 7:38 P.M.
AEROVANE (south tower)…..22 SSE @ 7:42 P.M.
ASOS…………………..20 S @ 8:03 P.M.
DAVIS #1……………….23 S @ 7:37 P.M.
DAVIS #2 (south tower)…..27 SSE @ 7:41 P.M.
RMY……………………22 @ 7:36 P.M.
VECTOR…………………23 @ 7:37 P.M.
MERLIN…………………20
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………15 SSE @ 7:44 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….14 SSE @ 7:38 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 S @ 7:33 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 SSE @ 7:46 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..14 S @ 7:35 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..14 @ 7:35 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…… 7.8 SE [186 total miles] ASOS………………… 7.5
DAVIS #1…………….. 8.1 SE
DAVIS #2…………….. 8.7 SE
RMY…………………. 7.8 SSE
VECTOR………………. 8.2
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.56 DEPARTURE….+0.40
ASOS………….0.54
TOTAL PRECIPITATION FOR THE MONTH………….0.67 DEPARTURE….-1.14
ASOS………….0.62
TOTAL PRECIPITATION FOR THE YEAR………….21.33 DEPARTURE….-3.14
ASOS………..21.48
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 The low since midnight is 53F, 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 12
HIGH 94F IN 2017
LOW 40F IN 1906
PRECIP 1.79 INS 1955
PEAK GUST 58 MPH NW IN 1991
RECORDS FOR JUNE 13
HIGH 93F IN 1988
LOW 43F IN 1982
PRECIP 6.07 INS 1998 [Record for month]PEAK GUST 69 MPH N IN 1956
TODAY’S REPORT PREPARED BY: Matt Douglas
