Friday, October 23, 2020
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
FRIDAY, OCTOBER 23, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME
DENSE FOG GIVES WAY TO MOSTLY CLOUDY SKIES…
Not the best looking Friday! Thick fog settled into
the area yesterday evening thanks to a maritime fog
bank that meandered its way onshore. It remained
solidly in place into this morning. At its worst,
visibility was 1/8 of a mile, even 1/16 at times
before finally eroding around 8:30 AM today into
overcast skies. This cloud deck slowly thinned into
the afternoon allowing for a few splashes of sun to
poke through. Skies are currently broken with a
maximum visibility of only 30 miles.
Winds have been rather light today, only topping out at
11 MPH with an average of just 4 MPH from the east.
The high so far today is 68F, 10 degrees above the daily
normal minimum of 58F. The low since midnight is 52F, 12
degrees above the normal low of 40F. These temperatures
are normal for late-September!
Today’s Observations:
7 A.M.
Weather: Overcast Stratus, Fog (few thin spots in overcast
overhead)
Temperature: 55F; Dew Point: 55F; Relative Humidity: 100%
Wind: E at 6 kts (wind light)
Sea-level pressure: 30.29 ins. Hg: rising, then rising more slowly
Visibility: 1/8 mile, fog
6-hr Max temp: 55F
6-hr Min temp: 52F
24-hr Precip: 0.00 ins.
BHO SA 1155 E10 OVC 1/8F 259/55/55/0806/029/ FEW THN SPTS
IOVC OVHD WND LGT/ 8/6// 51018 10055 20052
10 A.M.
Weather: Broken Stratocumulus
Temperature: 62; Dew Point: 55F; Relative Humidity: 78%
Wind: ESE at 5 kts (wind light)
Sea-level pressure: 30.28 ins. Hg: rising, then falling
Visibility: 25 miles, thin fog
3-hr Precip: 0.00 ins.
BHO SA 1455 E15 BKN 25 253/62/55/1105/028/ THN F ALQDS
WND LGT/ 8/400 58006
1 P.M.
Weather: Broken Stratocumulus
Temperature: 66F; Dew Point: 56F; Relative Humidity: 70%
Wind: E at 5 kts (wind light)
Sea-level pressure: 30.21 ins. Hg: falling, then falling more rapidly
Visibility: 30 miles, hazy
6-hr Max temp: 68F
6-hr Min temp: 55F
6-hr Precip: 0.00 inches
BHO SA 1755 E25 BKN 30 229/66/56/0805/021/ HAZY WND LGT/
8/400 58024 10068 20055
SUMMARY FOR THURSDAY, OCTOBER 22, 2020
TEMPERATURE (DEGREES F)
MAX…..70 NORMAL…..58
MIN…..54 NORMAL…..41
MEAN….62 NORMAL…..49
DEPARTURE FROM 30-YEAR NORMAL…………….+13
TOTAL DEPARTURE FOR THE MONTH…………….+81 [+3.5 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………. 3 DEPARTURE…..-13
TOTAL HEATING UNITS FOR THE MONTH…………181 DEPARTURE…..-86
TOTAL HEATING UNITS FOR THE SEASON………..279 DEPARTURE….-130
TOTAL HEATING UNITS LAST SEASON TO DATE……346 DEPARTURE…..-67
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………. 0 DEPARTURE…… 0
TOTAL COOLING UNITS FOR THE MONTH…………. 1 DEPARTURE….. -4
TOTAL COOLING UNITS FOR THE SEASON………..831 DEPARTURE….+229
TOTAL COOLING UNITS LAST SEASON TO DATE……682 DEPARTURE….+149
PEAK WIND GUST FOR YESTERDAY (MPH)
420C/Official……………18 SSW AT 12:09 A.M.
AEROVANE (south tower)……17 SSW AT 12:00 A.M.
ASOS……………………19 SSW AT 12:21 A.M
DAVIS #1………………..18 SSW AT 12:02 A.M
DAVIS #2 (south tower)……18 SW AT 12:05 A.M
RMY…………………….N/A
MERLIN………………….N/A
FASTEST MILE FOR YESTERDAY…………………13 SSW AT 12:06 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………14 SSW AT 12:19 A.M
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…………..13 SW AT 12:00 A.M
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE…………..14 SSW AT 12:00 A.M
AVERAGE WIND SPEED AND DIRECTION…………..7.4 E [178 total miles]
ASOS…………………..7.9
DAVIS #1……………….8.1 E [96 deg.]
DAVIS #2……………….8.1 E [82 deg.]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00 DEPARTURE….-0.16
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….4.20 DEPARTURE….+0.91
ASOS…………..4.18
TOTAL PRECIPITATION FOR THE YEAR……….38.62 DEPARTURE….-3.75
ASOS………….39.39
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 71/50/61/+9/0.00/…/.. 43 S AERO 46 S RMY 42
10/16 68/48/58/+7/…./…/.. 28 S AERO 30 S RMY N/A
10/17 56/39/48/-3/…./…/.. 35 WNW AERO 40 WNW RMY 37
10/18 60/46/53/+2/0.00/…/.. 20 ESE AERO 21 ESE RMY 20
10/19 61/46/54/+4/0.00/…/.. 16 ESE AERO 16 SSE RMY N/A
10/20 66/49/58/+8/0.00/…/.. 22 S AERO 22 S RMY 22
10/21 71/56/64/+14/0.06/…/.. 26 SSW AERO 26 SSW RMY 26
10/22 70/54/62/+13/0.00/…/.. 18 SSW AERO 17 SSW RMY N/A
10/23 The low since midnight is 52, the daily normal low is 40F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR OCTOBER 23
HIGH 82F IN 1947
LOW 24F IN 1969
PRECIP 3.66 INCHES IN 2014
SNOWFALL 3.0 INCHES IN 1891
PEAK GUST 78e MPH NW IN 1941
RECORDS FOR OCTOBER 24
HIGH 79F IN 1963
LOW 22F IN 1969
PRECIP 2.96 INCHES IN 1890
SNOWFALL 1.8 INCHES IN 1960
PEAK GUST 70 MPH SE IN 1959
TODAY’S REPORT PREPARED BY: Andrew Swanson
