Friday, June 18, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
FRIDAY, JUNE 18, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0407E
SUNSET: 1924E
GORGEOUS WEATHER CONTINUES, SOME AFTERNOON CLOUDS….
Today began under clear skies and cool temperatures.
A refreshing low of 56F was recorded. Visibility was
80 miles at 7AM slipping only to 75 miles by early afternoon.
High-level clouds began rolling in around mid-morning,
but have been scattered in nature.
Low dew points have been the theme of the last few days.
Today is no exception. We are seeing readings predominantly
in the 40s! This has allowed large temperature swings between
morning lows and afternoon highs.
The high so far today is 80F, which is 4 above below
the normal high of 76F. The low since midnight is 56F,
which is 2 degrees below the daily normal low of 58F.
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: 2.50 ins. on the 28th-29th
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: Clear (few cirrus W-N, thin smoke layer along horizon
NW-NE)
Temperature: 62F; Dew Point: 48F; Relative Humidity: 60%
Wind: W @ 7 kts
Sea-level pressure: 30.03 in. Hg; rising, then rising more slowly
Visibility: 80 miles
6-hr Max temp: 62F
6-hr Min temp: 56F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 80 169/62/48/2607/003/ FEW CI DSNT W-N
THN K LYR ALG HRZN NW-NE/ 8/001 51005 10062 20056
10 A.M.
Weather: Scattered Cirrus
Temperature: 75F; Dew Point: 48F; Relative Humidity: 38%
Wind: SW @ 9 kts
Sea-level pressure: 30.00 in Hg; Falling, then falling more rapidly
Visibility: 75 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 SCT 250 75 156/75/48/2109/000/ 8/001 58013
1 P.M.
Weather: Scattered Cirrus
Temperature: 79F, Dew point: 46F; Relative Humidity: 31%
Wind: SW @ 8G17 kts
Sea-level pressure: 29.96 in Hg; Falling, then falling more rapidly
Visibility: 75 miles
6-hr Max temp: 80F
6-hr Min temp: 62F
6-hr Precip: 0.00 ins.
BHO SA 1755 SCT 250 75 143/79/46/238G17/996/ 8/001 58013
10080 20062
SUMMARY FOR THURSDAY, JUNE 17, 2021
TEMPERATURE (DEGREES F)
MAX…….77 NORMAL…..76
MIN…….52 NORMAL…..58
MEAN……65 NORMAL…..67
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……..-2
TOTAL DEPARTURE FOR THE MONTH……………….+82 [+4.6 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL THRU JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………… 0 DEPARTURE…….-2
TOTAL HEATING UNITS FOR THE MONTH……………16 DEPARTURE……-42
TOTAL HEATING UNITS FOR THE SEASON…………5594 DEPARTURE…..-767
TOTAL HEATING UNITS LAST SEASON TO DATE…….5852 DEPARTURE…..-258
COOLING DEGREE DAYS (SEASON JAN THRU DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………….0 DEPARTURE…….-4
TOTAL COOLING UNITS FOR THE MONTH……………85 DEPARTURE……+41
TOTAL COOLING UNITS FOR THE SEASON………….114 DEPARTURE……+46
TOTAL COOLING UNITS LAST SEASON TO DATE………77 DEPARTURE……+37
PEAK WIND GUST (MPH):
420C/Official…………..21 WNW @ 12:01 P.M.
AEROVANE (south tower)…..21 NW @ 12:45 P.M
ASOS…………………..20 NW @ 1:12 P.M
VECTOR…………………23 @ 12:02 P.M
DAVIS #1……………….20 WNW @ 12:01 P.M
DAVIS #2 (south tower)…..20 WNW @ 9:41 A.M
RMY……………………23 @ 12:01 P.M
MERLIN…………………22
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………15*W @ 1:52 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….15 W @ 1:52 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..16 @ 12:02 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………16 W @ 1:52 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 NW @ 12:35 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..15 NNW @ 1:52 P.M.
*=estimated
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……7.5* WNW [181 total miles] ASOS…………………8.5
VECTOR……………….8.4
DAVIS #1……………..8.6 WNW
DAVIS #2……………..8.7 WNW
RMY………………….7.8 WNW
*=estimated
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00 DEPARTURE….-0.14
ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….1.30 DEPARTURE….-1.42
ASOS………….1.25
TOTAL PRECIPITATION FOR THE YEAR………….21.96 DEPARTURE….-3.42
ASOS………..22.11
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 77/61/69/+3/T/…/.. 18 NE AERO 20 NE RMY 18 TSTM
06/16 73/56/65/-1/0.00/…/.. 27 NNW AERO 31 NNW RMY 27
06/17 77/52/65/-2/0.00/…/.. 21 WNW AERO 21 NW RMY 23
06/18 The low since midnight is 56F, the daily normal low is 58F
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 18
HIGH 93F IN 1929, 1994
LOW 39F IN 1920
PRECIP 3.36 INS 1998
PEAK GUST 48e MPH W IN 1943
RECORDS FOR JUNE 19
HIGH 92F IN 1923
LOW 40F IN 1920
PRECIP 3.92 INS 1922
PEAK GUST 66e MPH NW IN 1940
TODAY’S REPORT PREPARED BY: Andrew Swanson
