Wednesday, September 22, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, SEPTEMBER 22, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0532E
SUNSET: 1741E
MOSTLY CLOUDY WITH A COOL SOUTHERLY BREEZE….
Today we observed mostly cloudy skies and a max visibility of
45 miles. Wind was a factor today, with an average speed above
10 mph and a max gust of almost 30 mph. The summit was humid for
most of the day, with an average humidity around 86%. Dew points
hung around in the mid to upper 60’s.
Light rain started a half hour before the 1 P.M. observation and
left 0.01 inches in the gauge.
The high so far today is 75F, 5 degrees above the normal max of
70F. The low since midnight is 65F, 12 degrees above the normal
low of 53F.
Today’s Observations:
7 A.M.
Weather: Scattered stratocumulus, broken altocumulus and cirrus
Temperature: 67F; Dew Point: 63F; Relative Humidity: 90%
Wind: SSE @ 13G23 kts
Sea-level pressure: 1023.8 mb; 30.23 in. Hg; falling, then more slowly
Visibility: 35 miles, hazy
6-hr Max temp: 67F
6-hr Min temp: 65F
24-hr Precip: 0.00 ins.
BHO SA 1155 30 SCT 75 BKN 250 BKN 35 238/67/63/1513G23/023/ HAZY/ 8/871
56006 10067 20065
10 A.M.
Weather: Broken stratocumulus and cirrus
Temperature: 73F; Dew Point: 66F; Relative Humidity: 78%
Wind: S @ 14G22 kts
Sea-level pressure: 1023.0 mb; 30.21 in Hg; falling steadily
Visibility: 45 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 30 BKN 250 BKN 45 230/73/66/1814G22/021/ 8/801 58008
1 P.M.
Weather: Overcast stratus, light rain beginning around 12:30 P.M.
Temperature: 71F, Dew point: 69F; Relative Humidity: 94%
Wind: S @ 10G20 kts
Sea-level pressure: 1021.2 mb; 30.15 in Hg; falling, then more slowly
Visibility: 20 miles, thin fog
6-hr Max temp: 75F
6-hr Min temp: 67F
6-hr Precip: 0.01 ins.
BHO SA 1755 30 OVC 20R- 212/71/69/1810G20/015/ R-B30 THN F ALQDS/ 8/6//
600// 56018 10075 20067
SUMMARY FOR TUESDAY, SEPTEMBER 21, 2021
TEMPERATURE (DEGREES F)
MAX…….75 NORMAL…..71
MIN…….55 NORMAL…..54
MEAN……65 NORMAL…..62
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….+3
TOTAL DEPARTURE FOR THE MONTH…………………….+11 [+0.3 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-4
TOTAL HEATING UNITS FOR THE MONTH……………15 DEPARTURE…….-32
TOTAL HEATING UNITS FOR THE SEASON…………..43 DEPARTURE…….-22
TOTAL HEATING UNITS LAST SEASON TO DATE………82 DEPARTURE…….-39
COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE MONTH……………44 DEPARTURE…….-21
TOTAL COOLING UNITS FOR THE SEASON………….694 DEPARTURE…….+33
TOTAL COOLING UNITS LAST SEASON TO DATE……..807 DEPARTURE……-113
PEAK WIND GUST (MPH):
Official……………….19 SSE @ 9:54 P.M.
AEROVANE (south tower)…..20 SSE @ 9:52 P.M.
VECTOR #2 (south tower)….21 @ 8:34 P.M.
DAVIS #2 (south tower)…..22 S @ 11:09 P.M.
ASOS………..OUT OF SERVICE D/T RENOVATIONS
VECTOR #1……OUT OF SERVICE D/T RENOVATIONS
DAVIS #1…….OUT OF SERVICE D/T RENOVATIONS
RMY…………OUT OF SERVICE D/T RENOVATIONS
MERLIN………OUT OF SERVICE D/T RENOVATIONS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………15 SSE @ 9:54 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15 @ 9:22 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 SSE @ 9:22 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE…….OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE..OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE RMY AVERAGE……..OUT OF SERVICE D/T RENOVATIONS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….8.6 SSE [206 total miles]
VECTOR #2……………..9.1
DAVIS #2………………8.8 SSE
RMY……………..OUT OF SERVICE D/T RENOVATIONS
ASOS…………….OUT OF SERVICE D/T RENOVATIONS
VECTOR #1………..OUT OF SERVICE D/T RENOVATIONS
DAVIS #1…………OUT OF SERVICE D/T RENOVATIONS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00 DEPARTURE….-0.15
TOTAL PRECIPITATION FOR THE MONTH………….5.52 DEPARTURE….+2.81
TOTAL PRECIPITATION FOR THE YEAR………….45.86 DEPARTURE….+8.80
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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
09/01 68/56/62/-7/1.47/000/00 34 NNE AERO 37 NNE RMY N/A
09/02 71/55/63/-6/2.53/322/41 49 ENE AERO 52 ENE RMY N/A
09/03 72/52/62/-6/0.00/735/94 23 NW AERO 23 NW RMY N/A
09/04 76/55/66/-2/0.00/757/97 22 WNW AERO 21 WNW RMY N/A
09/05 72/60/66/-2/0.04/008/01 27 S AERO 29 S RMY N/A
09/06 80/61/71/+3/0.00/…/.. 24 WNW AERO 25 WNW RMY N/A
09/07 78/57/68/+1/0.00/…/.. 23 WSW AERO 22 WSW RMY N/A
09/08 81/61/71/+4/0.00/…/.. 43 S AERO 45 S RMY N/A
09/09 71/64/68/+1/0.90/…/.. 33 S AERO 36 S RMY N/A
09/10 74/55/65/-1/0.04/…/.. 31 NW AERO 32 WNW RMY N/A
09/11 75/51/63/-3/0.00/…/.. 24 SW AERO 24 SW RMY N/A
09/12 79/60/70/+4/0.00/…/.. 33 SW AERO 32 SW RMY N/A
09/13 77/62/70/+5/0.06/…/.. 22 NW AERO 23 NW RMY N/A
09/14 75/59/67/+2/0.00/…/.. 23 S AERO 25 S RMY N/A
09/15 82/65/74/+9/T/…/.. 32 SSW AERO 35 SSW RMY N/A
09/16 69/61/65/+1/0.27/…/.. 24 ENE AERO 24 ENE RMY N/A TSTM
09/17 66/60/63/-1/0.02/…/.. 22 NE AERO 23 NE RMY N/A
09/18 74/62/68/+5/0.04/…/.. 17 WNW AERO 18 WNW RMY N/A TSTM
09/19 71/57/64/+1/0.15/…/.. 23 NNE AERO 24 NNE RMY N/A
09/20 71/55/63/0/0.00/…/.. 20 SE AERO 20 SE RMY N/A
09/21 75/55/65/+3/0.00/…/.. 19 SSE AERO 20 SSE RMY N/A
09/22 The low since midnight is 65F, the daily normal low is 53F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR SEPTEMBER 22
HIGH 90F IN 1895, 1914
LOW 30F IN 1904 (Earliest freeze)
PRECIP 1.16 INCHES IN 2001
PEAK GUST 60 MPH SSW IN 1989
RECORDS FOR SEPTEMBER 23
HIGH 93F IN 1895,1914
LOW 33F IN 1904
PRECIP 2.67 INCHES IN 1994
PEAK GUST 62 MPH SSW IN 1989
TODAY’S REPORT PREPARED BY: Benjamin Turner
