BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, OCTOBER 14, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME
A CRYSTAL CLEAR DAY FOLLOWING SOME MUCH-NEEDED
RAINFALL….
Yesterday was the first time in a while that we’ve had
a good rain storm! The total for the whole event was
1.74 inches, with the majority of it falling yesterday.
This evens out our monthly departure, but the annual
departure of -4.69 inches still looms.
Today we’ve had mostly clear skies, with a visibility
of 80 miles at the 1 P.M. observation. Wind is about
15 mph on average from the west, with a max gust of
22 mph so far. Dew points are in the mid 40’s, and
the afternoon humidity is 44%.
The high so far today is 66, 5 degrees above the daily
normal of 61F. The low since midnight is 47F, which is
4 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: Clear
Temperature: 49F; Dew Point: 48F; Relative Humidity: 98%
Wind: WNW at 10G17 kts
Sea-level pressure: 29.86 ins. Hg: rising steadily
Visibility: 65 miles, fog
6-hr Max temp: 49F
6-hr Min temp: 47F
24-hr Precip: 1.42 ins.
BHO SA 1155 CLR 65 112/49/48/3010G17/986/ 70142 53020 10049
20047
10 A.M.
Weather: Clear
Temperature: 58F; Dew Point: 49F; Relative Humidity: 72%
Wind: WNW at 8 kts
Sea-level pressure: 29.90 ins. Hg: rising steadily
Visibility: 75 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 75 125/58/49/3008/990/ 51013
1 P.M.
Weather: Clear, few distant cumulus
Temperature: 65F; Dew Point: 43F; Relative Humidity: 44%
Wind: W at 9 kts
Sea-level pressure: 29.90 ins. Hg: rising steadily
Visibility: 80 miles
6-hr Max temp: 49F
6-hr Min temp: 66F
6-hr Precip: 0.00
BHO SA 1755 CLR 80 126/65/43/2709/990/ FEW CU DSNT ALQDS/ 8/100
50001 10066 20049
SUMMARY FOR TUESDAY, OCTOBER 13, 2020
TEMPERATURE (DEGREES F)
MAX…..57 NORMAL…..61
MIN…..49 NORMAL…..44
MEAN….53 NORMAL…..53
DEPARTURE FROM 30-YEAR NORMAL……………. 0
TOTAL DEPARTURE FOR THE MONTH…………….+22 [+1.5 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….12 DEPARTURE….. -1
TOTAL HEATING UNITS FOR THE MONTH…………111 DEPARTURE…..-27
TOTAL HEATING UNITS FOR THE SEASON………..209 DEPARTURE…..-71
TOTAL HEATING UNITS LAST SEASON TO DATE……233 DEPARTURE…..-24
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……………32 E AT 7:10 A.M.
AEROVANE………………..33 E AT 6:34 A.M.
ASOS……………………34 ENE AT 7:10 A.M.
DAVIS #1………………..33 E AT 7:10 A.M.
DAVIS #2………………..29 E AT 7:10 A.M.
RMY N/A MERLIN N/A
FASTEST MILE FOR YESTERDAY…………………23 ENE AT 5:46 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………23 E AT 7:14 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…………..23 E AT 6:02 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE…………..23 E AT 6:02 A.M.
AVERAGE WIND SPEED AND DIRECTION………….14.6 ENE (351 total miles)
ASOS………………….15.1
DAVIS #1………………15.0 ENE [060 deg.]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….1.90 DEPARTURE….+1.27
ASOS…………..1.91
TOTAL PRECIPITATION FOR THE MONTH……….1.90 DEPARTURE….-0.03
ASOS…………..1.91
TOTAL PRECIPITATION FOR THE YEAR……….36.32 DEPARTURE….-4.69
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 RMT N/A
10/14 The low since midnight is 47F, 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 14
HIGH 79F IN 2000
LOW 28F IN 1958
PRECIP 2.69 INCHES IN 1990
SNOWFALL 2.0 INCHES IN 1913
PEAK GUST 63e W IN 1976
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
TODAY’S REPORT PREPARED BY: Benjamin Turner
Monthly Skymail, event announcements, and research summaries.
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