Sunday, October 11, 2020
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SUNDAY, OCTOBER 11, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME
COOLER, BUT PLEASANT DAY WITH INCREASING CLOUDINESS…
Plenty of sunshine greeted us through the first half of
the day, however this afternoon an increasing amount
of high clouds has filtered the sun from time to time.
The air has really dried out with the dew point falling
to the upper 30s and low 40s. This has afforded excellent
visibility for the day of 70-80 miles.
A cold front moved through early this morning bringing
with it some breezy conditions for a couple of hours in
the cold air advection. Gusts of 25-30 mph were common,
however winds have diminished and turned east-
northeasterly, helping to hold temperatures in the upper
50s to low 60s. The high temperature for the day occurred
way back at midnight before the front came through.
The high so far today is 64, 12 degrees above the daily
normal of 62F. The low since midnight is 53F, which is
8 degrees above the normal low of 45F.
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: Thin scattered cirrus, few stratocumulus distant
ENE-ESE and distant WSW-NW, few altocumulus/castellanus
distant E-SSE
Temperature: 53F; Dew Point: 39F; Relative Humidity: 58%
Wind: NNW at 15G25 kts, peak wind NNW 28kts at 6:09 A.M.
Sea-level pressure: 30.08 ins. Hg: rising, then more rapidly
Visibility: 70 miles
6-hr Max temp: 64F
6-hr Min temp: 53F
24-hr Precip: 0.00 ins.
BHO SA 1155 250 -SCT 70 187/53/39/3415G25/008/ FEW SC DSNT ENE-ESE
AND DSNT WSW-NW FEW AC/ACC DSNT E-SSE PK WND 3428/09/ 8/581 53039
10064 20053
10 A.M.
Weather: Thin scattered cirrus, few stratocumulus distant all
quadrants
Temperature: 60F; Dew Point: 40F; Relative Humidity: 47%
Wind: N at 5 kts, wind light and variable
Sea-level pressure: 30.17 ins. Hg: rising, then more slowly
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 250 -SCT 80 216/60/40/0105/017/ FEW SC DSNT ALQDS
WND L/V/ 8/501 51029
1 P.M.
Weather: Broken cirrus, few stratocumulus distant all quadrants
Temperature: 58F; Dew Point: 39F; Relative Humidity: 49%
Wind: ENE at 8 kts
Sea-level pressure: 30.18 ins. Hg: rising, then falling
Visibility: 80 miles
6-hr Max temp: 61F
6-hr Min temp: 53F
6-hr Precip: 0.00 ins.
BHO SA 1755 E250 BKN 80 221/58/39/0608/018/ FEW SC DSNT ALQDS/
8/502 50005 10061 20053
SUMMARY FOR SATURDAY, OCTOBER 10, 2020
TEMPERATURE (DEGREES F)
MAX…..75 NORMAL…..62
MIN…..52 NORMAL…..45
MEAN….64 NORMAL…..54
DEPARTURE FROM 30-YEAR NORMAL…………….+10
TOTAL DEPARTURE FOR THE MONTH…………….+22 [+2.0 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………. 1 DEPARTURE…..-11
TOTAL HEATING UNITS FOR THE MONTH………….75 DEPARTURE…..-25
TOTAL HEATING UNITS FOR THE SEASON………..173 DEPARTURE…..-70
TOTAL HEATING UNITS LAST SEASON TO DATE……196 DEPARTURE…..-23
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……………40 SSW AT 1:11 P.M.
AEROVANE………………..40 SSW AT 3:26 P.M.
ASOS……………………38 SSW AT 1:51 P.M.
DAVIS #1………………..42 SSW AT 1:11 P.M.
DAVIS #2………………..39 SSW AT 11:49 A.M.
RMY 38 MERLIN 39
FASTEST MILE FOR YESTERDAY…………………30 SSW AT 12:22 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………29 SSW AT 11:50 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…………..29 SSW AT 11:50 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE…………..30 SSW AT 11:50 A.M.
AVERAGE WIND SPEED AND DIRECTION………….20.3 SSW (488 total miles)
ASOS………………….19.7
DAVIS…………………19.4 SW [226 deg.]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00 DEPARTURE….-0.15
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.16 DEPARTURE….-1.33
ASOS…………..0.12
TOTAL PRECIPITATION FOR THE YEAR……….34.58 DEPARTURE….-5.99
ASOS………….35.33
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 The low since midnight is 53F, the daily normal low is 45F
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 0.96 INCHES IN 1903
SNOWFALL (NONE)
PEAK GUST 66e MPH WNW IN 1941
RECORDS FOR OCTOBER 12
HIGH 87F IN 1954
LOW 31F IN 1906
PRECIP 1.53 INCHES IN 1948
SNOWFALL TRACE IN 1941
PEAK GUST 55 MPH NW IN 1963
TODAY’S REPORT PREPARED BY: Matt Douglas
