Saturday, October 10, 2020
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SATURDAY, OCTOBER 10, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME
A WARM AND WINDY, BUT DRY DAY AT BLUE HILL…
Plenty of sunshine has been observed today with only some
broken high clouds around this morning. Also have been
observing a thin smoke layer aloft. Temperatures have
responded quite effectively to the sunshine and south-
southwest wind. The high so far this afternoon has
reached the mid 70s.
The wind has been busy today averaging around 21 mph
since 7 A.M. The peak gust so far today has been 37 mph.
Visibility has been decreasing from 50 miles this morning
to only around 35-40 miles this afternoon. This is due to
an increase in haziness as the dew point has risen from
the upper 40s to the mid 50s.
The high so far today is 75, 13 degrees above the daily
normal of 62F. The low since midnight is 52F, which is
7 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: Broken cirrostratus/cirrocumulus, thin broken cirrus
Temperature: 58F; Dew Point: 48F; Relative Humidity: 69%
Wind: SW at 18G25 kts, peak wind SSW 26kts at 6:10 A.M.
Sea-level pressure: 30.00 ins. Hg: rising, then steady
Visibility: 50 miles, hazy
6-hr Max temp: 58F
6-hr Min temp: 53F
24-hr Precip: 0.00 ins.
BHO SA 1155 E200 BKN 250 -BKN 50 158/58/48/2218G25/000/ HAZY
PK WND 2126/10/ 8/009 51004 10058 20053
10 A.M.
Weather: Scattered cirrostratus, thin sctattered cirrus,
few stratocumulus distant SE-SSW, thin smoke layer aloft SW-NW
Temperature: 68F; Dew Point: 52F; Relative Humidity: 56%
Wind: SSW at 18G30 kts, peak wind SSW 30 kts at 10:53 A.M.
Sea-level pressure: 29.94 ins. Hg: falling, then more rapidly
Visibility: 50 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 200 SCT 250 -SCT 50 140/68/52/2118G30/994/ FEW SC DSNT SE-SSW
THN K LYR ALF SW-NW HAZY PK WND 2130/53/ 8/508 58018
1 P.M.
Weather: Clear, few cumulus distant SE-SSW, few cirrus all quadrants,
thin smoke layer aloft
Temperature: 75F; Dew Point: 55F; Relative Humidity: 50%
Wind: SSW at 20G30 kts, peak wind SSW 31 kts at 12:22 P.M.
Sea-level pressure: 29.86 ins. Hg: falling, then more rapidly
Visibility: 40 miles, hazy
6-hr Max temp: 75F
6-hr Min temp: 58F
6-hr Precip: 0.00 ins.
BHO SA 1755 CLR 40 113/75/55/2120G30/986/ FEW CU DSNT SE-SSW
FEW CI ALQDS THN K LYR ALF HAZY PK WND 2131/22/ 8/201 58027
10075 20058
SUMMARY FOR FRIDAY, OCTOBER 9, 2020
TEMPERATURE (DEGREES F)
MAX…..60 NORMAL…..63
MIN…..37 NORMAL…..45
MEAN….49 NORMAL…..54
DEPARTURE FROM 30-YEAR NORMAL……………. -5
TOTAL DEPARTURE FOR THE MONTH…………….+12 [+1.1 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….16 DEPARTURE….. +5
TOTAL HEATING UNITS FOR THE MONTH………….74 DEPARTURE…..-15
TOTAL HEATING UNITS FOR THE SEASON………..172 DEPARTURE…..-59
TOTAL HEATING UNITS LAST SEASON TO DATE……182 DEPARTURE…..-10
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………. 0 DEPARTURE…… 0
TOTAL COOLING UNITS FOR THE MONTH…………. 1 DEPARTURE….. -2
TOTAL COOLING UNITS FOR THE SEASON………..831 DEPARTURE….+231
TOTAL COOLING UNITS LAST SEASON TO DATE……682 DEPARTURE….+149
PEAK WIND GUST FOR YESTERDAY (MPH)
420C/Official……………25 SSW AT 11:24 P.M.
AERO……………………28 SSW AT 7:31 P.M.
ASOS……………………27 SSW AT 11:25 P.M.
DAVIS…………………..26 SSW AT 11:02 P.M.
RMY N/A MERLIN N/A
FASTEST MILE FOR YESTERDAY…………………21 SSW AT 11:36 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………18 S AT 11:41 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..19 W AT 2:09 P.M.
AVERAGE WIND SPEED AND DIRECTION………….11.5 NW (276 total miles)
ASOS………………….11.5
DAVIS…………………11.5 W [274 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….-1.18
ASOS…………..0.12
TOTAL PRECIPITATION FOR THE YEAR……….34.58 DEPARTURE….-5.84
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 The low since midnight is 52F, 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 10
HIGH 85F IN 1949
LOW 27F IN 1929
PRECIP 2.02 INCHES IN 1998
SNOWFALL 6.8 INCHES IN 1979 (RECORD FOR MONTH)
PEAK GUST 59 MPH WNW IN 1958
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
TODAY’S REPORT PREPARED BY: Matt Douglas
