Thursday, October 15, 2020
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY, OCTOBER 15, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME
A BLUSTERY, FALL-LIKE DAY ATOP GREAT
BLUE HILL….
Today we’ve had partly cloudy skies, with a visibility
of 1/8 miles at the 7 A.M. observation due to fog.
This rose to a decent visibility of 65 miles by 10 A.M.,
and stayed around there for the rest of the day. Wind
has definitely picked up since this morning, with a
max gust of 42 mph from the south. Pressure is on the
decline, dropping 3 millibars between 10 A.M. and 1 P.M.
Dew points are in the mid 50’s, and the afternoon humidity
is 44%.
The high so far today is 71F, 10 degrees above the daily
normal of 61F. However, the average temperature for the
day is in the low 60’s. The low since midnight is 50F,
which is 7 degrees above the normal low of 43F.
PRELIMINARY STATS FOR SEPTEMBER 2020
TEMPERATURE, Deg. F
Avg. Max. 73.2 [+1.6]
Avg. Min. 54.9 [+0.3]
Mean 64.1 [+1.0]
24-hour corrected mean: 63.6
Max. for month: 82F on the 8th
Min. for month: 39F on the 22nd
HEATING DEGREE DAYS
Total heating units: 95 [-22]
Total for the season: 98 [-44]
Total for last season: 93
COOLING DEGREE DAYS
Total cooling units: 73 [+13]
Total for the season: 830 [+233]
Total for last season: 680
PRECIPITATION, Inches
Total: 1.61 [-2.45]
Greatest in 24 hrs: 1.02 ins. on 29th-30th
WIND, mph
Avg. uncorrected wind speed: 10.6 mph
Avg. corrected wind speed: 11.1 mph
Prevailing wind direction: S [20%]
Peak gust and direction: 71 S on the 30th
SUNSHINE:
Campbell-Stokes card minutes: 12150 minutes of a possible 21582 or 56%
Astronomical total minutes: 12593 minutes of a possible 22403 or 56%
Today’s Observations:
7 A.M.
Weather: Fog, sun dimly visible
Temperature: 52F; Dew Point: 52F; Relative Humidity: 100%
Wind: S at 13 kts
Sea-level pressure: 30.07 ins. Hg: rising steadily
Visibility: 1/8 mile, fog
6-hr Max temp: 55F
6-hr Min temp: 50F
24-hr Precip: 0.00 ins.
BHO SA 1155 X W3 1/8F 183/52/52/1813/007/ SUN DMLY VSBL/
8//// 50003 10055 20050
10 A.M.
Weather: Scattered altocumulus, broken cirrostratus
Temperature: 64F; Dew Point: 57F; Relative Humidity: 77%
Wind: S at 13G22 kts
Sea-level pressure: 30.08 ins. Hg: rising steadily
Visibility: 65 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 180 SCT 250 BKN 65 186/64/57/1813G22/008/
8/086 50003
1 P.M.
Weather: Broken cirrostratus
Temperature: 69F; Dew Point: 47F; Relative Humidity: 44%
Wind: S at 21G31 kts, peak of 37 mph S at 12:30 P.M.
Sea-level pressure: 30.01 ins. Hg: falling steadily
Visibility: 65 miles
6-hr Max temp: 71F
6-hr Min temp: 52F
6-hr Precip: 0.00
BHO SA 1755 250 BKN 65 163/69/47/1921G31/001/ PK WND
1832/30/ 8/006 58023 10071 20052
SUMMARY FOR WEDNESDAY, OCTOBER 14, 2020
TEMPERATURE (DEGREES F)
MAX…..67 NORMAL…..61
MIN…..47 NORMAL…..43
MEAN….57 NORMAL…..52
DEPARTURE FROM 30-YEAR NORMAL…………….+5
TOTAL DEPARTURE FOR THE MONTH…………….+27 [+1.7 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….8 DEPARTURE….. -1
TOTAL HEATING UNITS FOR THE MONTH…………119 DEPARTURE…..-32
TOTAL HEATING UNITS FOR THE SEASON………..217 DEPARTURE…..-76
TOTAL HEATING UNITS LAST SEASON TO DATE……239 DEPARTURE…..-22
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………. 0 DEPARTURE…… 0
TOTAL COOLING UNITS FOR THE MONTH…………. 1 DEPARTURE….. -3
TOTAL COOLING UNITS FOR THE SEASON………..831 DEPARTURE….+230
TOTAL COOLING UNITS LAST SEASON TO DATE……682 DEPARTURE….+149
PEAK WIND GUST FOR YESTERDAY (MPH)
420C/Official……………23 WNW AT 6:02 A.M.
AEROVANE………………..25 WNW AT 5:48 A.M.
ASOS……………………23 WNW AT 4:44 A.M.
DAVIS #1………………..24 W AT 3:50 P.M.
DAVIS #2………………..24 WNW AT 5:14 A.M.
RMY N/A MERLIN N/A
FASTEST MILE FOR YESTERDAY…………………15 WNW AT 3:14 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………16 W AT 3:14 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…………..17 WNW AT 3:14 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE…………..18 WNW AT 5:15 A.M.
AVERAGE WIND SPEED AND DIRECTION………….10.7 WNW (257 total miles)
ASOS………………….10.3
DAVIS #1………………11.1 WNW [290 deg.]
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……….1.90 DEPARTURE….-0.17
ASOS…………..1.91
TOTAL PRECIPITATION FOR THE YEAR……….36.32 DEPARTURE….-4.83
ASOS………….37.12
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 76/59/68/0/0.00/698/88 22 SSE AERO 21 SE RMY 20
09/02 69/59/64/-4/0.18/102/13 23 SSE AERO 23 SSE RMY 24
09/03 75/66/71/+4/0.04/000/00 22 SSW AERO 21 SSW RMY N/A
09/04 82/62/72/+5/0.00/763/98 26 WNW AERO 26 WNW RMY 25
09/05 76/55/66/-1/0.00/760/98 25 W AERO 25 W RMY 24
09/06 78/58/68/+1/0.00/356/46 24 W AERO 24 W RMY N/A
09/07 79/61/70/+4/0.00/632/82 27 SSE AERO 30 SSE RMY 28
09/08 82/61/72/+6/0.00/545/71 17 S AERO 16 S RMY 17
09/09 80/62/71/+5/0.00/214/28 16 S AERO 15 S RMY 16
09/10 81/69/75/+10/0.28/015/02 21 SSW AERO 21 SSW RMY N/A
09/11 72/55/64/-1/0.01/152/20 25 N AERO 25 N RMY N/A
09/12 68/51/60/-5/0.00/666/88 21 ENE AERO 21 ENE RMY 21
09/13 74/53/64/0/0.00/611/81 26 SSW AERO 26 SSW RMY 26
09/14 74/50/62/-2/0.00/511/68 29 NNW AERO 33 NNW RMY 30
09/15 64/44/54/-10/0.00/583/78 18 S AERO 18 S RMY N/A
09/16 72/49/61/-2/0.00/603/81 31 SSW AERO 31 SSW RMY 31
09/17 76/57/67/+4/0.00/453/61 26 WSW AERO 28 W RMY N/A
09/18 64/48/56/-6/0.00/163/22 28 NE AERO 30 NNW RMY N/A
09/19 59/42/51/-11/0.00/722/98 23 N AERO 23 N RMY N/A
09/20 58/40/49/-13/0.00/602/82 25 NE AERO 25 NE RMY 27
09/21 61/41/51/-10/0.00/694/95 29 NE AERO 27 NE RMY 29
09/22 63/39/51/-10/0.00/022/03 28 NNW AERO 30 NNW RMY 29
09/23 78/50/64/+4/0.00/617/85 31 NW AERO 32 WNW RMY 32
09/24 76/57/67/+7/0.00/347/48 20 SW AERO 18 WSW RMY 19
09/25 77/57/67/+7/0.00/655/91 18 ENE AERO 18 WSW RMY N/A
09/26 77/57/67/+8/0.00/516/72 21 S AERO 21 S RMY 21
09/27 79/64/72/+13/0.01/121/17 24 S AERO 25 S RMY 24
09/28 78/64/71/+13/0.07/199/28 24 SSE AERO 24 S RMY 25
09/29 76/62/69/+11/0.01/234/33 30 S AERO 30 S RMY N/A
09/30 72/56/64/+6/1.01/395/56 71 S AERO 88 S 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 75/56/66/+9/0.00/…/.. 28 SW AERO 28 SW RMY N/A
10/02 63/49/56/-1/0.02/…/.. 20 NW AERO 21 NW RMY 20
10/03 65/45/55/-1/0.00/…/.. 19 WNW AERO 19 WNW RMY 19
10/04 65/45/55/-1/0.00/…/.. 17 ESE AERO 18 ESE RMY 18
10/05 62/52/57/+1/0.00/…/.. 17 ENE AERO 17 ENE RMY N/A
10/06 69/51/60/+5/0.00/…/.. 28 S AERO 28 S RMY 29
10/07 73/50/62/+7/0.14/…/.. 76 W AERO 74 W RMY 70 TSTM
10/08 61/42/52/-2/0.00/…/.. 41 W AERO 41 W RMY N/A
10/09 60/37/49/-5/0.00/…/.. 25 SSW AERO 28 SSW RMY N/A
10/10 75/52/64/+10/0.00/…/.. 40 SSW AERO 40 SSW RMY 38
10/11 64/47/56/+3/0.00/…/.. 32 NNW AERO 35 NNW RMY N/A
10/12 52/48/50/-3/T/…/.. 28 E AERO 27 E RMY N/A
10/13 57/49/53/0/1.74/…/.. 32 E AERO 33 E RMY N/A
10/14 67/47/57/+5/0.00/…/.. 23 WNW AERO 25 WNW RMY N/A
10/15 The low since midnight is 50F, the daily normal low is 43F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR OCTOBER 15
HIGH 83F IN 1897
LOW 29F IN 1887,1937
PRECIP 4.58 INCHES IN 2005
SNOWFALL TRACE IN 1961,1972
PEAK GUST 69 MPH W IN 2003
RECORDS FOR OCTOBER 16
HIGH 86F IN 1897
LOW 28F IN 1886
PRECIP 2.82 INCHES IN 1974
SNOWFALL TRACE IN 2009
PEAK GUST 68e MPH SSE IN 1954 (HURRICANE HAZEL)
TODAY’S REPORT PREPARED BY: Benjamin Turner
