Monday, October 5, 2020

| October 5, 2020 | Reply

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

MONDAY, OCTOBER 5, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

COOL, YET HUMID WITH LIMITED VISIBILITY AND
A SEA BREEZE….

Today we observed a limited visibility of 35 miles on
average due to a layer of thin fog in the distance.
Humidity has been high, at an average around 80%. This
is due in part to a light sea breeze from the NE, coming
in at about 10 mph. Skies were overcast this morning, but
the sun broke out around noontime.

The drought monitor was updated on Thursday revealing yet
another escalation. 55% of MA now in a “severe drought”
and 29% considered in an “extreme drought” (approximately
Boston to Providence and points south and east).

-Drought section written by Andrew Swanson

The high so far today is 60F, 5 degrees below the daily
normal. The low since midnight is 53F, which is 6 degrees
above the normal low of 47F.

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: N/A
Astronomical total minutes: N/A

Today’s Observations:

7 A.M.
Weather: Overcast stratus
Temperature: 56F; Dew Point: 53F; Relative Humidity: 96%
Wind: NNE at 7 kts
Sea-level pressure: 30.14 ins. Hg: steady, then rising
Visibility: 25 miles, thin fog
6-hr Max temp: 55F
6-hr Min temp: 53F
24-hr Precip: 0.00 ins.
BHO SA 1155 30 OVC 25 208/56/53/0207/014/ THN FG ALQDS/
8/6// 52009 10055 20053

10 A.M.
Weather: Overcast stratus
Temperature: 56F; Dew Point: 53F; Relative Humidity: 90%
Wind: NNE at 10 kts
Sea-level pressure: 30.16 ins. Hg: falling, then rising
Visibility: 25 miles, thin fog
3-hr Precip: 0.00 ins.
BHO SA 1455 30 OVC 25 215/56/53/0310/016/ THN FG ALQDS/
8/6// 51007

1 P.M.
Weather: Scattered stratocumulus
Temperature: 59F; Dew Point: 52F; Relative Humidity: 77%
Wind: NE at 5 kts
Sea-level pressure: 30.16 ins. Hg: rising, then falling
Visibility: 35 miles, thin fog
6-hr Max temp: 60F
6-hr Min temp: 53F
6-hr Precip: 0.00 ins.
BHO SA 1755 50 BKN 35 214/59/52/0507/016/ THN FG ALQDS/
8/800 58001 10060 20053

SUMMARY FOR SUNDAY, OCTOBER 4, 2020

TEMPERATURE (DEGREES F)
MAX…..65   NORMAL…..65
MIN…..45   NORMAL…..47
MEAN….55   NORMAL…..56

DEPARTURE FROM 30-YEAR NORMAL……………..-1
TOTAL DEPARTURE FOR THE MONTH……………..+6 [+1.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….10  DEPARTURE…..  0
TOTAL HEATING UNITS FOR THE MONTH………….29  DEPARTURE….. -7
TOTAL HEATING UNITS FOR THE SEASON………..127  DEPARTURE…..-51
TOTAL HEATING UNITS LAST SEASON TO DATE……132  DEPARTURE……-5

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………. 0  DEPARTURE…… 0
TOTAL COOLING UNITS FOR THE MONTH…………. 1  DEPARTURE….. -1
TOTAL COOLING UNITS FOR THE SEASON………..831  DEPARTURE….+232
TOTAL COOLING UNITS LAST SEASON TO DATE……680  DEPARTURE….+151

PEAK WIND GUST FOR YESTERDAY (MPH)
420C/Official…………….17 ESE AT  7:37 P.M.
AERO…………………….18 ESE AT  7:37 P.M.
ASOS…………………….18 ESE AT  5:29 P.M.
DAVIS……………………17 NNW AT 12:20 A.M.
RMY N/A  MERLIN N/A
FASTEST MILE FOR YESTERDAY………………….15 ESE AT  7:41 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….14 ENE AT 11:59 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………15 ESE AT  7:36 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..8.0 E (192 total miles)
ASOS…………………..8.1
DAVIS………………….8.5 NE [49 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……….0.02  DEPARTURE….-0.58
ASOS…………..0.02
TOTAL PRECIPITATION FOR THE YEAR……….34.45  DEPARTURE….-5.23
ASOS………….35.23

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/…/..            29 NE   AERO 27 NE   RMY 29
09/22  63/39/51/-10/0.00/…/..            28 NNW  AERO 30 NNW  RMY 29
09/23  78/50/64/+4/0.00/…/..             31 NW   AERO 32 WNW  RMY 32
09/24  76/57/67/+7/0.00/…/..             20 SW   AERO 18 WSW  RMY 19
09/25  77/57/67/+7/0.00/…/..             18 ENE  AERO 18 WSW  RMY N/A
09/26  77/57/67/+8/0.00/…/..             21 S    AERO 21 S    RMY 21
09/27  79/64/72/+13/0.01/…/..            24 S    AERO 25 S    RMY 24
09/28  78/64/71/+13/0.07/…/..            24 SSE  AERO 24 S    RMY 25
09/29  76/62/69/+11/0.01/…/..            30 S    AERO 30 S    RMY N/A
09/30  72/56/64/+6/1.01/…/..             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 The low since midnight is 45F, the daily normal low is 47F

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

RECORDS FOR OCTOBER 5
HIGH 86F IN 2007
LOW 29F IN 1965
PRECIP 3.17 INCHES IN 1962
PEAK GUST 64e MPH S IN 1979

RECORDS FOR OCTOBER 6
HIGH 83F IN 1990, 2007
LOW 26F IN 1965
PRECIP 3.78 INCHES IN 1962
PEAK GUST 60e MPH S IN 1942

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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