Thursday, September 16, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY, SEPTEMBER 16, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0526E
SUNSET: 1752E
MOSTLY CLOUDY WITH LIGHT RAIN AND LIMITED VISIBILITY….
Today we observed little in the way of visibility, seeing
only 20 miles at 1 P.M. This is a slight improvement from
the 1/16th mile we saw this morning due to dense fog.
Light rain this morning amounted to 0.03 inches by 1 P.M.
Rain that fell overnight left us with 0.24 inches at
the 7 A.M. observation. This gives us a monthly total of
5.28 inches, which is 3.45 inches above normal at this point
in the month. The annual rain total is 45.62 inches, almost
9 1/2 inches above normal for this time of year.
A few breaks in overcast were seen throughout the day, but the
clouds have filled back in since then.
The high so far today is 69F, this is 4 degrees below the
daily normal maximum of 73F. The low so far today is 63F,
which is 7 degrees above the daily normal minimum of 56F.
Today’s Observations:
7 A.M.
Weather: Light rain
Temperature: 64F; Dew Point: 64F; Relative Humidity: 100%
Wind: N @ 8 kts
Sea-level pressure: 1024.0 mb; 30.24 in. Hg; rising then more rapidly
Visibility: 1/16 mile, fog
6-hr Max temp: 68F
6-hr Min temp: 63F
24-hr Precip: 0.24 ins.
BHO SA 1155 X W3 1/16R-F 240/64/64/0108/024/ 8//// 53025 10068 20063
10 A.M.
Weather: Light rain ending around 9:15 A.M., Scattered cumulus fractus,
broken altostratus, few lower stratus fractus with a break in overcast
to the west
Temperature: 65F; Dew Point: 65F; Relative Humidity: 100%
Wind: ENE @ 7G14 kts
Sea-level pressure: 1025.5 mb; 30.29 in Hg; rising, then more rapidly
Visibility: 10 miles, thin fog
3-hr Precip: 0.02 ins.
BHO SA 1455 50 SCT 140 BKN 10R- 255/65/65/0707G14/029/ FEW LWR STFRA ALQDS
BINOVC W THN F ALQDS R-E15/ 8/720 6002/ 53015
1 P.M.
Weather: Broken cumulus, cumulus fractus, altostratus, few lower stratus
fractus with a break in overcast overhead
Temperature: 67F, Dew point: 64F; Relative Humidity: 90%
Wind: E @ 8 kts
Sea-level pressure: 1026.2 mb; 30.31 in Hg; rising unsteadily
Visibility: 20 miles, thin fog
6-hr Max temp: 69F
6-hr Min temp: 63F
6-hr Precip: 0.03 ins.
BHO SA 1755 40 BKN 90 BKN 20 262/67/64/0908/031/ FEW LWR STFRA ALQDS
BINOVC OVHD THN F ALQDS/ 8/720 6003/ 52007 10069 20063
SUMMARY FOR WEDNESDAY, SEPTEMBER 15, 2021
TEMPERATURE (DEGREES F)
MAX…….82 NORMAL…..73
MIN…….65 NORMAL…..56
MEAN……74 NORMAL…..65
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….+9
TOTAL DEPARTURE FOR THE MONTH…………………….+2 [-0.1 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE MONTH……………10 DEPARTURE…….-15
TOTAL HEATING UNITS FOR THE SEASON…………..38 DEPARTURE……..-5
TOTAL HEATING UNITS LAST SEASON TO DATE………25 DEPARTURE…….+13
COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….9 DEPARTURE……..+7
TOTAL COOLING UNITS FOR THE MONTH……………41 DEPARTURE…….-12
TOTAL COOLING UNITS FOR THE SEASON………….691 DEPARTURE…….+42
TOTAL COOLING UNITS LAST SEASON TO DATE……..805 DEPARTURE……-114
PEAK WIND GUST (MPH):
Official……………….32 SSW @ 3:01 P.M.
AEROVANE (south tower)…..35 SSW @ 3:01 P.M.
VECTOR #2 (south tower)….35 @ 3:11 P.M.
DAVIS #2 (south tower)…..33 S @ 1:37 A.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………………24 SSW @ 3:01 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..25 @ 3:03 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………24 SSW @ 3:03 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
*LAST OF TWO OCCURRENCES
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….14.5 S [348 total miles]
VECTOR #2……………..15.1
DAVIS #2………………15.0 SSW
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…….0.24 DEPARTURE….+0.11
TOTAL PRECIPITATION FOR THE MONTH………….5.28 DEPARTURE….+3.45
TOTAL PRECIPITATION FOR THE YEAR………….45.62 DEPARTURE….+9.44
PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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
08/01 77/58/68/-5/T/589/68 23 SSW AERO 24 SSW RMY N/A
08/02 78/61/70/-3/T/821/95 28 WNW AERO 28 WNW RMY N/A
08/03 76/60/68/-5/0.00/302/35 15 N AERO 16 N RMY N/A
08/04 75/61/68/-5/0.71/077/09 21 ESE AERO 21 ESE RMY N/A
08/05 68/61/65/-8/1.68/000/00 28 NE AERO 28 NE RMY N/A
08/06 85/62/74/+1/0.00/727/85 19 S AERO 20 WSW RMY N/A
08/07 88/66/77/+4/0.00/520/61 23 SW AERO 23 SW RMY N/A
08/08 80/67/74/+2/T/128/15 16 SW AERO 16 WNW RMY N/A
08/09 75/64/70/-2/0.25/076/09 22 ENE AERO 21 NE RMY N/A
08/10 78/63/71/-1/0.12/203/24 19 S AERO 20 S RMY N/A
08/11 89/70/80/+8/0.00/667/79 29 SSW AERO 28 SSW RMY N/A
08/12 91/71/81/+9/T/580/69 36 WSW AERO 37 WSW RMY N/A TSTM
08/13 92/73/83/+11/0.00/696/83 18 WSW AERO 18 WSW RMY N/A
08/14 87/69/78/+6/T/601/72 25 W AERO 25 NNW RMY N/A
08/15 80/62/71/-1/0.00/800/96 19 NNW AERO 20 NNW RMY N/A
08/16 78/59/69/-3/0.00/564/68 15 S AERO 15 S RMY N/A
08/17 82/63/73/1/0.00/555/67 22 SSW AERO 23 SSW RMY N/A
08/18 86/66/76/+5/0.00/338/41 21 SSW AERO 22 SSW RMY N/A
08/19 81/69/75/+4/0.62/222/27 41 S AERO 43 S RMY N/A
08/20 78/70/74/+3/0.01/066/08 21 WSW AERO N/A RMY N/A
08/21 86/69/78/+7/0.00/581/71 17 S AERO 17 S RMY N/A
08/22 74/66/70/-1/0.78/000/00 47 ESE AERO 48 ESE RMY N/A
08/23 83/68/76/+5/1.17/333/41 25 SSE AERO 26 SSE RMY N/A TSTM
08/24 86/67/77/+6/0.01/567/70 21 NNW AERO 21 NNW RMY N/A
08/25 89/70/80/+10/0.00/783/97 17 SW AERO 18 SW RMY N/A
08/26 92/72/82/+12/0.00/765/95 19 WSW AERO 18 WSW RMY N/A
08/27 89/70/80/+10/T/626/78 30 ENE AERO 30 ENE RMY N/A
08/28 70/59/65/-5/0.02/296/37 34 ENE AERO 34 ENE RMY N/A
08/29 72/59/66/-4/T/016/02 20 S AERO 21 S RMY N/A
08/30 84/67/76/+7/0.00/246/31 25 SW AERO 26 SW RMY N/A
08/31 80/65/73/+4/0.00/371/47 27 WNW AERO 28 WNW RMY N/A
RECORDS FOR THE MONTH
08/22 NEW PEAK GUST RECORD OF 47 MPH,
BEATING THE OLD RECORD OF 44 MPH IN 1987
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/…./…/.. 32 SSW AERO 35 SSW RMY N/A
09/16 The low since midnight is 63F, 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 SEPTEMBER 16
HIGH 91F IN 1939,1941
LOW 39F IN 1984
PRECIP 5.12 INCHES IN 1933 (Hurricane)
PEAK GUST 59 MPH SSE IN 1999
RECORDS FOR SEPTEMBER 17
HIGH 87F IN 2015
LOW 38F IN 1959
PRECIP 2.73 INCHES IN 1933
PEAK GUST 60 MPH WNW IN 1999
TODAY’S REPORT PREPARED BY: Benjamin Turner
