Thursday, October 3, 2019

| October 3, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, OCTOBER 3, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERCAST AND COOL FOLLOWING LAST NIGHT’S RAIN….

Last night’s rain left 0.42 inches in the gauge at the
7 A.M. observation. Trace amounts were seen from a passing
shower between 11 A.M. and 12 A.M. Wind has remained relatively
light throughout the day, shifting from NNE to E. Skies have
remained overcast, but visibility is good at around 70 miles.

The cold front that passed by yesterday brought temperatures
well below normal. The high so far today is 51F, which is 14
degrees below the normal high of 65F. The low this morning was
47F, which is a degree below the normal low of 48F.

PRELIMINARY STATS FOR SEPTEMBER 2019

TEMPERATURE, Deg. F
Avg. Max. 73.6 [+2.0]
Avg. Min. 54.5 [-0.1]
Mean      61.4 [-1.7]
24-hour corrected mean: 63.4
Max. for month: 88F on the 23rd
Min. for month: 43F on the 19th

HEATING DEGREE DAYS
Total heating units:    81 [-36]
Total for the season:   93 [-49]
Total for last season:  87

COOLING DEGREE DAYS
Total cooling units:    58  [-2]
Total for the season:  680 [+83]
Total for last season: 863

PRECIPITATION, Inches
Total: 1.27 [-2.79]
Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed: 10.3 mph
Avg. corrected wind speed:   10.9 mph
Prevailing wind direction:   SSW [11%]
Peak gust and direction:     39 W on the 2nd

SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes:   N/A

Today’s Observations:

7 A.M.
Weather: Broken stratocumulus, overcast altocumulus
Temperature: 48F; Dew Point: 40F; Wind: NE at 10 kts,
gusting to 18 kts
Sea-level pressure: 30.20 ins. Hg, rising steadily
Visibility: 70 miles
6-hr Max temp: 48F
6-hr Min temp: 47F
24-hr Precip: 0.42 ins.
BHO SA 1155 E30 BKN 170 OVC 70 227/48/40/0410G18/020/
8/87/ 70042 53020 10048 20047

10 A.M.
Weather: Broken stratocumulus, overcast altocumulus
Temperature: 50F; Dew Point: 40F; Wind: ENE at 12G19 kts
Sea-level pressure: 30.20 ins. Hg, rising then falling
Visibility: 75 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E30 BKN 110 OVC 75 227/50/40/0712G19/020/
8/87/ 58000

1 P.M.
Weather: Broken stratocumulus, overcast altocumulus
Temperature: 48F; Dew Point: 40F; Wind: E at 9 kts
Sea-level pressure: 30.17 ins. Hg, rising then falling
Visibility: 70 miles
6-hr Max temp: 51F
6-hr Min temp: 47F
6-hr Precip: Trace
BHO SA 1755 E30 BKN 110 OVC 70 217/48/40/1009/017/ 8/87/
600// 58010 10051 20047

SUMMARY FOR WEDNESDAY, OCTOBER 2, 2019

TEMPERATURE (DEGREES F)
MAX…..74   NORMAL…..65
MIN…..49   NORMAL…..48
MEAN….62   NORMAL…..57

DEPARTURE FROM 30-YEAR NORMAL………………….+5
TOTAL DEPARTURE FOR THE MONTH………………….+8 [+3.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………3   DEPARTURE………-6
TOTAL HEATING UNITS FOR THE MONTH……………8   DEPARTURE………-3
TOTAL HEATING UNITS FOR THE SEASON…………101   DEPARTURE……..-58
TOTAL HEATING UNITS LAST SEASON TO DATE……..99   DEPARTURE………+2

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………-1
TOTAL COOLING UNITS FOR THE MONTH……………0   DEPARTURE………-1
TOTAL COOLING UNITS FOR THE SEASON…………680   DEPARTURE……..+83
TOTAL COOLING UNITS LAST SEASON TO DATE…….863   DEPARTURE…….-183

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..30 ENE  AT 10:42 P.M.
AERO…………………….25 ENE  AT 10:42 P.M.
ASOS…………………….29 NNE  AT 10:50 P.M.
DAVIS……………………29 NE   AT 10:49 P.M. RMY 28
FASTEST MILE FOR YESTERDAY………………….20 ENE  AT  1:32 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 NE   AT 10:58 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………20 ENE  AT  1:30 P.M.
AVERAGE WIND SPEED AND DIRECTION……………11.5 ENE
ASOS……………………11.6
DAVIS…………………..12.0 NNE [23 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.42  DEPARTURE……+0.27
ASOS…………..0.41
TOTAL PRECIPITATION FOR THE MONTH……….0.48  DEPARTURE……+0.17
ASOS…………..0.47
TOTAL PRECIPITATION FOR THE YEAR……….38.90  DEPARTURE……-0.50
ASOS………….38.70

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

9/01  73/56/65/-3/0.00/703/89                21 ENE AERO 14 ENE RMY 18
9/02  75/57/66/-2/0.37/165/21                39 W   AERO 41 W   RMY 41
9/03  77/61/69/+2/0.00/643/82                18 S   AERO 16 S   RMY N/A
9/04  83/61/72/+5/0.00/375/48                30 SW  AERO 28 SW  RMY 30
9/05  68/54/61/-6/0.00/513/66                23 NW  AERO 17 NW  RMY N/A
9/06  65/56/61/-6/0.03/054/07                37 ENE AERO 36 ENE RMY 36
9/07  70/51/61/-5/0.27/325/42                37 N   AERO 37 N   RMY N/A
9/08  73/53/63/-3/0.00/631/82                25 W   AERO 21 W   RMY N/A
9/09  71/54/63/-3/0.00/537/70                17 SE  AERO 16 SE  RMY 16
9/10  73/57/65/0/0.00/207/27                 25 S   AERO 25 S   RMY N/A
9/11  83/63/73/+8/0.00/419/55                31 SW  AERO 32 SW  RMY N/A
9/12  70/52/61/-4/0.11/015/02                29 ENE AERO 28 ENE RMY 28
9/13  65/49/57/-7/0.00/741/98                29 ENE AERO 27 ENE RMY 27
9/14  69/49/59/-5/0.19/030/04                36 S   AERO 37 S   RMY 37
9/15  78/62/70/+6/0.00/600/80                24 W   AERO 23 W   RMY 22
9/16  72/54/63/0/T/673/90                    25 WNW AERO 23 WNW RMY 25
9/17  67/49/58/-5/0.00/611/82                23 NW  AERO 23 N   RMY N/A
9/18  61/49/55/-7/0.00/…/..                26 NE  AERO 25 NE  RMY 25
9/19  67/43/55/-7/0.00/…/..                17 NE  AERO 18 NE  RMY N/A
9/20  78/50/64/+2/0.00/…/..                21 W   AERO 18 W   RMY 20
9/21  83/60/72/+11/0.00/…/..               21 WNW AERO 18 WNW RMY N/A
9/22  85/62/74/+13/0.00/…/..               24 SW  AERO 23 SW  RMY 25
9/23  88/65/77/+17/0.00/…/..               29 SSW AERO 28 SSW RMY 29
9/24  76/56/66/+6/0.04/…/..                26 W   AERO 26 W   RMY 27
9/25  73/50/62/+2/0.00/…/..                22 W   AERO 21 W   RMY 21
9/26  79/55/67/+8/0.25/…/..                38 SW  AERO 37 SW  RMY 39
9/27  72/50/61/+2/0.00/…/..                23 S   AERO 23 S   RMY 22
9/28  78/55/67/+9/0.00/…/..                31 S   AERO 29 S   RMY 30
9/29  75/53/64/+6/0.00/…/..                24 NW  AERO 23 NW  RMY 23
9/30  62/49/56/-2/0.00/…/..                23 NNE AERO 16 NNE 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  67/52/60/+3/0.06/…/..               28 SW  AERO 25 SSW RMY 29
10/02  74/49/62/+5/0.42/…/..               30 ENE AERO 25 ENE RMY 28

10/03  The low since midnight is 47F, normal daily minimum is 48F

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

RECORDS FOR OCTOBER 3
HIGH 82F IN 1922
LOW 28F IN 1899
PRECIP 1.76 INCHES IN 1979
PEAK GUST 62 MPH WNW IN 1964

RECORDS FOR OCTOBER 4
HIGH 84F IN 2007
LOW 28F IN 1888
PRECIP 1.87 INCHES IN 2011
PEAK GUST 59 MPH SSW IN 1990

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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