Monday, October 11, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
MONDAY, OCTOBER 11, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0553E
SUNSET: 1708E
PARTLY CLOUDY AND COMFORTABLY MILD WITH AN ONSHORE BREEZE….
Cloudy skies and even a little light rain started the day, but
clouds gave way to mostly sunny skies by late morning.
Temperatures rose into the mid-upper 60s with a gentle onshore
breeze. All in all it was nice day for the Boston Marathon and
any outdoor activities.
Visibility started under 1 mile, but improved to 30 miles by
early afternoon as the air dried out some.
The high so far today is 67F, 4 degrees above the normal max of
63F. The low since midnight is 58F, 12 degrees above the normal
low of 46F.
PRELIMINARY STATS FOR SEPTEMBER 2021
TEMPERATURE, Deg. F
Avg. Max. 73.2 [+0.5]
Avg. Min. 57.4 [+1.8]
Mean 65.3 [+1.1]
24-hour corrected mean: 64.8
Max. for month: 82F on the 15th
Min. for month: 45F on the 29th
HEATING DEGREE DAYS
Total heating units: 46 [-54]
Total for the season: 74 [-44]
Total for last season: 98
COOLING DEGREE DAYS
Total cooling units: 62 [-12]
Total for the season: 714 [+44]
Total for last season: 830
PRECIPITATION, Inches
Total: 6.64 [+2.58]
Greatest in 24 hrs: 4.00 inches on the 1st/2nd
WIND, mph
Avg. uncorrected wind speed: 10.5 mph
Avg. corrected wind speed: 11.0 mph
Prevailing wind direction: NW [11%]
Peak gust and direction: 49 ENE on the 2nd
SUNSHINE:
Campbell-Stokes card minutes: 11490 of a possible 21582, or 53%
Astronomical total minutes: 11965 of a possible 22423, or 53%
Today’s Observations:
7 A.M.
Weather: Sky obscured, vertical visibility 300ft
Temperature: 58F; Dew Point: 58F; Relative Humidity: 100%
Wind: NE @ 8 kts
Sea-level pressure: 1021.4 mb; 30.16 in. Hg: rising steadily
Visibility: 3/4 mile, fog
6-hr Max temp: 59F
6-hr Min temp: 58F
24-hr Precip: 0.01 ins.
BHO SA 1155 X W3 3/4F 214/58/58/0408/016/ R-B08E15B26E29B37E51/ 8////
52009 6001/ 70001 10059 20058
10 A.M.
Weather: Overcast stratus, few breaks in overcast overhead-E-SE
Temperature: 61F; Dew Point: 60F; Relative Humidity: 94%
Wind: ENE @ 7 kts
Sea-level pressure: 1021.1 mb; 30.15 in Hg; rising then falling
Visibility: 10 miles, thin fog
3-hr Precip: 0.00 ins.
BHO SA 1455 E6 OVC 10 211/61/60/0607/015/ FEW BINOVC OVHD-E-SE THN F ALQDS/
8/6// 50003
1 P.M.
Weather: Scattered stratus fractus, scattered stratocumulus, thin broken cirrus
Temperature: 65F, Dew point: 59F; Relative Humidity: 80%
Wind: NNE @ 9 kts
Sea-level pressure: 1019.5 mb; 30.11 in Hg; falling, then more slowly
Visibility: 30 miles, hazy
6-hr Max temp: 67F
6-hr Min temp: 58F
6-hr Precip: 0.00 ins.
BHO SA 1755 8 SCT 12 SCT E250 -BKN 30 195/65/59/0309/011/ HAZY/
8/501 56016 10067 20058
SUMMARY FOR SUNDAY, OCTOBER 10, 2021
TEMPERATURE (DEGREES F)
MAX…….62 NORMAL…..63
MIN…….54 NORMAL…..46
MEAN……58 NORMAL…..55
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..+3
TOTAL DEPARTURE FOR THE MONTH……………………..+21 [+1.9 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….7 DEPARTURE……..-4
TOTAL HEATING UNITS FOR THE MONTH……………65 DEPARTURE…….-26
TOTAL HEATING UNITS FOR THE SEASON………….139 DEPARTURE…….-69
TOTAL HEATING UNITS LAST SEASON TO DATE……..173 DEPARTURE…….-34
COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….0 DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH…………….0 DEPARTURE……..-5
TOTAL COOLING UNITS FOR THE SEASON………….714 DEPARTURE…….+39
TOTAL COOLING UNITS LAST SEASON TO DATE……..831 DEPARTURE……-117
PEAK WIND GUST (MPH):
Official……………….22 E @ 6:26 P.M.
AEROVANE (south tower)…..21 E @ 6:30 P.M.
VECTOR #2 (south tower)….22 @ 6:26 P.M.
DAVIS #2 (south tower)…..21 ESE @ 6:26 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………………16 ENE @ 8:31 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16 @ 6:27 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 E @ 6:27 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……..10.1 E [241 total miles]
VECTOR #2………………10.7
DAVIS #2……………….10.9 E
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…….0.01 DEPARTURE….-0.16
TOTAL PRECIPITATION FOR THE MONTH………….2.10 DEPARTURE….+0.42
TOTAL PRECIPITATION FOR THE YEAR………….49.00 DEPARTURE….+8.99
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/+3/0.00/557/72 24 WNW AERO 25 WNW RMY N/A
09/07 78/57/68/+1/0.00/732/95 23 WSW AERO 22 WSW RMY N/A
09/08 81/61/71/+4/0.00/646/84 43 S AERO 45 S RMY N/A
09/09 71/64/68/+1/0.90/000/00 33 S AERO 36 S RMY N/A
09/10 74/55/65/-1/0.04/595/78 31 NW AERO 32 WNW RMY N/A
09/11 75/51/63/-3/0.00/730/96 24 SW AERO 24 SW RMY N/A
09/12 79/60/70/+4/0.00/591/78 33 SW AERO 32 SW RMY N/A
09/13 77/62/70/+5/0.06/559/74 22 NW AERO 23 NW RMY N/A
09/14 75/59/67/+2/0.00/444/59 23 S AERO 25 S RMY N/A
09/15 82/65/74/+9/T/539/72 32 SSW AERO 35 SSW RMY N/A
09/16 69/61/65/+1/0.27/037/05 24 ENE AERO 24 ENE RMY N/A TSTM
09/17 66/60/63/-1/0.02/000/00 22 NE AERO 23 NE RMY N/A
09/18 74/62/68/+5/0.04/207/28 17 WNW AERO 18 WNW RMY N/A TSTM
09/19 71/57/64/+1/0.15/619/84 23 NNE AERO 24 NNE RMY N/A
09/20 71/55/63/0/0.00/647/88 20 SE AERO 20 SE RMY N/A
09/21 75/55/65/+3/0.00/490/67 19 SSE AERO 20 SSE RMY N/A
09/22 75/65/70/+8/0.02/153/21 30 S AERO 30 S RMY N/A
09/23 78/65/72/+10/0.08/298/41 36 SSE AERO 37 SSE RMY N/A
09/24 75/62/69/+8/0.02/007/01 43 SSE AERO 45 SSE RMY N/A
09/25 74/59/67/+6/0.02/303/42 14 N AERO 14 NNW RMY N/A
09/26 73/54/64/+4/0.57/510/71 33 WNW AERO 32 WNW RMY N/A
09/27 73/52/63/+3/T/529/74 30 SW AERO 30 SW RMY N/A
09/28 67/52/60/+1/0.40/028/04 27 SSW AERO 25 SSW RMY N/A TSTM
09/29 63/45/54/-5/0.00/568/80 25 NNW AERO 25 NNW RMY N/A
09/30 60/46/53/-6/0.01/354/50 22 NNW AERO 21 NNW RMY N/A
PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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
10/01 64/44/54/-4/0.00/…/.. 20 WNW AERO 20 WNW RMY N/A
10/02 73/47/60/+2/0.00/…/.. 24 WSW AERO 23 WSW RMY N/A
10/03 65/55/60/+3/0.09/…/.. 19 E AERO 19 E RMY N/A
10/04 59/51/55/-2/1.69/…/.. 30 E AERO 30 E RMY N/A
10/05 58/50/54/-3/0.30/…/.. 22 NNE AERO 23 NE RMY N/A
10/06 69/50/60/+4/0.00/…/.. 15 N AERO 16 N RMY N/A
10/07 73/55/64/+8/0.00/…/.. 15 WSW AERO 15 W RMY N/A
10/08 69/55/62/+7/T/…/.. 24 ENE AERO 23 ENE RMY N/A
10/09 62/54/58/+3/0.01/…/.. 23 E AERO 23 E RMY N/A
10/10 62/54/58/+3/T/…/.. 22 E AERO 21 E RMY N/A
10/11 The low since midnight is 58F, the daily normal low is 46F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR OCTOBER 11
HIGH 80F IN 1919,1949
LOW 28F IN 1993
PRECIP 1.36 INCHES IN 2019
SNOWFALL (NONE)
PEAK GUST 66e MPH WNW IN 1941
RECORDS FOR OCTOBER 12
HIGH 87F IN 1954
LOW 31F IN 1906
PRECIP 1.70 INCHES IN 1948
SNOWFALL TRACE IN 1904, 1941
PEAK GUST 55 MPH NW IN 1963
TODAY’S REPORT PREPARED BY: Matt Douglas
