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Sunday, October 18, 2020

October 18, 2020

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SUNDAY, OCTOBER 18, 2020 ALL TIMES ARE…

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

SUNDAY, OCTOBER 18, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

A COOLER DAY WITH MOSTLY CLOUDY SKIES AND
GREAT VISIBILITY….

Today we observed mostly cloudy skies covered by a
translucent layer of cirrostratus clouds, which left
an uninterrupted burn on the sun card. Wind is south-
easterly, with a max gust of 20 mph and an average
speed barely exceeding 10 mph. Visibility was between
75 and 80 miles on average, while pressure is very
steadily decreasing between the 10 A.M. and 1 P.M.
observations.

The high so far today is 60F, the same as the daily
normal minimum. The low since midnight is 46F, 4 degrees
above the normal low of 42F.

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
Temperature: 48F; Dew Point: 34F; Relative Humidity: 57%
Wind: SE at 7 kts
Sea-level pressure: 30.55 ins. Hg: rising, then more slowly
Visibility: 80 miles
6-hr Max temp: 48F
6-hr Min temp: 46F
24-hr Precip: 0.03 ins.
BHO SA 1155 250 BKN 80 344/48/34/1407/055/ 8/008 70003
53013 10048 20046

10 A.M.
Weather: Broken cirrostratus
Temperature: 57F; Dew Point: 37F; Relative Humidity: 47%
Wind: SSE at 8G17 kts
Sea-level pressure: 30.56 ins. Hg: falling then rising
Visibility: 75 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 250 BKN 75 347/57/37/1508G17/056/ 8/008 50003

1 P.M.
Weather: Broken cirrostratus
Temperature: 59F; Dew Point: 34F; Relative Humidity: 38%
Wind: ESE at 8G15 kts
Sea-level pressure: 30.51 ins. Hg: falling steadily
Visibility: 75 miles
6-hr Max temp: 60F
6-hr Min temp: 48F
6-hr Precip: 0.00 inches
BHO SA 1755 250 BKN 75 331/59/34/1108G15/051/ 8/008 58016
10060 20048

SUMMARY FOR SATURDAY, OCTOBER 17, 2020

TEMPERATURE (DEGREES F)
MAX…..56   NORMAL…..60
MIN…..39   NORMAL…..42
MEAN….48   NORMAL…..51

DEPARTURE FROM 30-YEAR NORMAL……………..-3
TOTAL DEPARTURE FOR THE MONTH…………….+40 [+2.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….17  DEPARTURE….. +3
TOTAL HEATING UNITS FOR THE MONTH…………147  DEPARTURE…..-45
TOTAL HEATING UNITS FOR THE SEASON………..245  DEPARTURE…..-89
TOTAL HEATING UNITS LAST SEASON TO DATE……276  DEPARTURE…..-31

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……………35 WNW AT  12:20 P.M.
AEROVANE (south tower)……40 WNW AT   9:56 A.M.
ASOS……………………35 NW  AT   2:46 A.M.
DAVIS #1………………..36 WNW AT  12:02 P.M.
DAVIS #2 (south tower)……37 WNW AT   9:58 A.M.
RMY…………………….37
MERLIN………………….34
FASTEST MILE FOR YESTERDAY…………………25 WNW AT  12:03 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………23 WNW AT  12:23 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…………..25 WNW AT  12:23 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE…………..26 WNW AT   8:16 A.M.
AVERAGE WIND SPEED AND DIRECTION………….12.7 NNW [305 total miles] ASOS………………….12.2
DAVIS #1………………12.8 NW  [316 deg.] DAVIS #2………………13.2 NW  [320 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.03  DEPARTURE….-0.12
ASOS…………..0.03
TOTAL PRECIPITATION FOR THE MONTH……….4.14  DEPARTURE….+1.62
ASOS…………..4.13
TOTAL PRECIPITATION FOR THE YEAR……….38.56  DEPARTURE….-3.04
ASOS………….39.34

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    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 The low since midnight is 46F, the daily normal low is 42F

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

RECORDS FOR OCTOBER 18
HIGH 82F IN 1908
LOW 26F IN 1939
PRECIP 2.79 INCHES IN 1975
SNOWFALL 3.0 INCHES IN 2009
PEAK GUST 66 MPH S IN 1967

RECORDS FOR OCTOBER 19
HIGH 81F IN 1945
LOW 21F IN 1922
PRECIP 3.64 INCHES IN 1932
SNOWFALL 1.0 INCHES IN 1972
PEAK GUST 66 MPH SSW IN 1967

TODAY’S REPORT PREPARED BY: Benjamin Turner

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Blue Hill Observatory & Science Center · Legal

Data Use & Privacy Policy

Please read the full Policy before accessing Observatory data · Effective January 1, 2025

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
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