Monday, October 12, 2020

| October 12, 2020 | Reply

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

MONDAY, OCTOBER 12, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

CLOUDY AND CHILLY WITH A TOUCH OF RAIN IN THE EARLY
AFTERNOON…

After a rather pleasant weekend, today we’ve been under
cloudy skies with a brisk and chilly east wind. A few
light rain showers have moved through early this
afternoon, hopefully a precursor to more substantial
rain later tonight and tomorrow.

After being in the 70s on Saturday, today feels quite
chilly with the temperature holding in the low 50s most
of the day. An east wind gusting 25-30 mph at times off
the ocean has only added to the chill.

Visibility has been gradually decreasing as the day
moves along with a moistening atmosphere. We started
the day observing 60 miles, but has lowered to 35 miles
by early this afternoon.

The high so far today is 52, 10 degrees below the daily
normal of 62F. The low since midnight is 48F, which is
4 degrees above the normal low of 44F.

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 stratocumulus, overcast altostratus/nimbostratus,
few breaks in overcast distant NW
Temperature: 49F; Dew Point: 38F; Relative Humidity: 65%
Wind: ENE at 9G16 kts
Sea-level pressure: 30.33 ins. Hg: rising, then more slowly
Visibility: 60 miles
6-hr Max temp: 49F
6-hr Min temp: 48F
24-hr Precip: 0.00 ins.
BHO SA 1155 E35 BKN 120 OVC 60 272/49/38/0709G16/033/
FEW BINOVC DSNT NW VIRGA ALQDS/ 8/52/ 51007 10049 20048

10 A.M.
Weather: Broken stratocumulus, overcast altostratus/nimbostratus
Temperature: 51F; Dew Point: 40F; Relative Humidity: 65%
Wind: E at 14G20 kts
Sea-level pressure: 30.35 ins. Hg: rising, then more slowly
Visibility: 45 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E30 BKN 100 OVC 45 279/51/40/0914G20/035/ 8/52/ 51007

1 P.M.
Weather: Overcast stratocumulus, light rain
Temperature: 51F; Dew Point: 42F; Relative Humidity: 70%
Wind: E at 13G24 kts
Sea-level pressure: 30.29 ins. Hg: falling, then more rapidly
Visibility: 35 miles
6-hr Max temp: 51F
6-hr Min temp: 49F
6-hr Precip: Trace
BHO SA 1755 E30 OVC 35R- 259/51/42/0813G24/029/ RB20 PCPN VRY LGT/
8/5// 58020 6000 10052 20049

SUMMARY FOR SUNDAY, OCTOBER 11, 2020

TEMPERATURE (DEGREES F)
MAX…..64   NORMAL…..62
MIN…..47   NORMAL…..45
MEAN….56   NORMAL…..53

DEPARTURE FROM 30-YEAR NORMAL……………. +3
TOTAL DEPARTURE FOR THE MONTH…………….+25 [+2.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………. 9  DEPARTURE….. -3
TOTAL HEATING UNITS FOR THE MONTH………….84  DEPARTURE…..-29
TOTAL HEATING UNITS FOR THE SEASON………..182  DEPARTURE…..-73
TOTAL HEATING UNITS LAST SEASON TO DATE……211  DEPARTURE…..-29

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 NNW AT   6:09 A.M.
AEROVANE………………..35 NNW AT   6:09 A.M.
ASOS……………………32 NNW AT   6:09 A.M.
DAVIS #1………………..32 N   AT   6:09 A.M.
DAVIS #2………………..33 NNW AT   6:09 A.M.
RMY N/A  MERLIN N/A
FASTEST MILE FOR YESTERDAY…………………24 NNW AT   6:10 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………23 NW  AT   6:10 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…………..23 NNW AT   6:09 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE…………..24 NNW AT   6:13 A.M.
AVERAGE WIND SPEED AND DIRECTION………….11.7 E (287 total miles)
ASOS………………….11.2
DAVIS #1………………12.1 NE [046 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….-1.48
ASOS…………..0.12
TOTAL PRECIPITATION FOR THE YEAR……….34.58  DEPARTURE….-6.14
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  64/47/56/+3/0.00/…/..             32 NNW  AERO 35 NNW  RMY N/A

10/12  The low since midnight is 48F, the daily normal low is 44F

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

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

RECORDS FOR OCTOBER 13
HIGH 84F IN 1930,1954
LOW 29F IN 2012
PRECIP 5.92 INCHES IN 1895
SNOWFALL 4.2 INCHES IN 1934
PEAK GUST 46e MPH W IN 1950

TODAY’S REPORT PREPARED BY: Matt Douglas

Category: Daily Discussions

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