Wednesday, November 8, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, NOVEMBER 8, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

CHILLY AIR FROM THE NORTHWEST BRINGS COLDER TEMPS…

We had a chilly start to the day on top of Great
Blue Hill with an overnight minimum temperature
of 34F. This is only two degrees above our normal
of 36F for this day. A bit more unseasonable was
our maximum temperature for yesterday which was
46F, seven degrees below our normal of 53F. Tuesday
was the first day to average colder than normal since
October 17th. Light rain passed overnight leaving
0.19 inches of precipitation.
The morning began as overcast stratus but skies began
to clear just before noon allowing the sun to shine
through scattered cumulus. Winds have been light to
moderate and continue to come from the north/northeast.

PRELIMINARY STATS FOR OCTOBER 2017

TEMPERATURE, Deg. F
Avg. Max. 68.0 [+7.7] Avg. Min. 51.7 [+8.8] Mean      59.9 [+8.3] 24-hour corrected mean: 59.2
Max. for month: 79F on 5th
Min. for month: 35F on 17th

HEATING DEGREE DAYS
Total heating units: 175 [-246] Total for the season: 268 [-295] Total for last season: 421

COOLING DEGREE DAYS
Total cooling units: 24 [+19] Total for the season: 731 [+129] Total for last season: 901

PRECIPITATION, Inches
Total: 5.94 [+1.25] Greatest in 24 hrs: 3.12 on the 29th-30th

WIND, mph
Avg. uncorrected wind speed: 12.4
Avg. corrected wind speed: 12.8
Prevailing wind direction: S at 14%
Peak gust and direction: 73 SE on 30th

SUNSHINE:
Campbell-Stokes card minutes: 11,520 minutes of possible 19,824 or 58%
Astronomical total minutes: 11,928 minutes of possible 20,524 or 58%

BHO Warmest Octobers, deg F (1885-2017):

1) 59.2 in 2017
2) 58.4 in 1947
3) 56.9 in 2007
4) 56.6 in 1971
5) 56.5 in 1963
6) 55.7 in 1946
7) 55.5 in 1995
8) 55.3 in 1990

Today’s Observations:

7 A.M.
Weather: Overcast stratus
Temperature: 35F; Dew Point: 32F; Wind: N at 10 kts
Sea-level pressure: 30.25 ins. Hg, rising steadily
Visibility: 50 miles except 30 miles NE-SW
6-hr Max temp: 36F
6-hr Min temp: 34F
24-hr precip: 0.19 inches
BHO SA 1155 E20 OVC 40 245/35/32/0110/025/ VSBY 30 E-S DSNT FG E-S/
8/6/// 53015 MANUAL 70019 ASOS 70018 10036 20034

10 A.M.
Weather: Scattered stratocumulus
Temperature: 39F; Dew Point: 31F; Wind: NNE at 10G23 kts
Sea-level pressure: 30.29 ins. Hg, rising, then more slowly
Visibility: 75 miles, except 30 miles NE-S. Distant fog NE-S.
BHO SA 1455 E30 BKN 75 257/39/31/0210G23/029/ VSBY 30 NE-S
DSNT FG NE-S/ 8/500 51012

1 P.M.
Weather: Scattered cumulus, few stratocumulus NE-S
Temperature: 43F; Dew Point: 29F; Wind: NE at 9G18 kts
Sea-level pressure: 30.25 ins. Hg, falling then more quickly
Visibility: 75 miles
6-hr Max temp: 43F
6-hr Min temp: 35F
BHO SA 1755 E30 SCT 75 244/43/29/0409G18/025/ FEW DSNT SC NE-S/
8/100 58013 10043 20035

SUMMARY FOR TUESDAY, NOVEMBER 7, 2017

TEMPERATURE (DEGREES F)
MAX…..46   NORMAL…..53
MIN…..35   NORMAL…..36
MEAN….41   NORMAL…..45

DEPARTURE FROM 30-YEAR NORMAL…………………….-4
TOTAL DEPARTURE FOR THE MONTH……………………+45 [+6.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..24   DEPARTURE………..4
TOTAL HEATING UNITS FOR THE MONTH…………..90   DEPARTURE………-47
TOTAL HEATING UNITS FOR THE SEASON…………358   DEPARTURE……..-342
TOTAL HEATING UNITS LAST SEASON TO DATE…….546   DIFFERENCE…….-188

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….26 NNW   AT  5:00 A.M.
AERO……………………23 N     AT  5:01 A.M.
ASOS……………………27 NNW   AT  5:02 A.M.
DAVIS…………………..25 N     AT  5:01 A.M.  RMY 26
FASTEST MILE FOR YESTERDAY…………………18 NNW   AT  3:10 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………17 N     AT  4:08 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..18 NNW   AT  3:12 A.M.
AVERAGE WIND SPEED AND DIRECTION………….8.9  NNW
ASOS………………….9.4
DAVIS…………………8.4 N     [008 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.19  DEPARTURE……+0.03
ASOS…………..0.17
TOTAL PRECIPITATION FOR THE MONTH……….0.25  DEPARTURE……-0.84
ASOS…………..0.24
TOTAL PRECIPITATION FOR THE YEAR……….48.05  DEPARTURE……+3.19
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

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

10/1  65/42/54/-3/0.00/697/99             18 WNW AERO 16 NW  RMY N/A
10/2  65/46/56/-1/0.00/687/98             21 NNW AERO 21 NNW RMY 21
10/3  67/50/59/+3/0.00/677/97             21 S   AERO 21 S   RMY N/A
10/4  75/50/63/+7/0.00/660/95             30 SSW AERO 30 SW  RMY 32
10/5  79/60/70/+14/0.00/429/62            28 SW  AERO 26 SW  RMY N/A
10/6  73/57/65/+10/T/352/51               15 NW  AERO 14 NW  RMY 15
10/7  75/59/67/+12/T/344/50               29 S   AERO 30 SSW RMY N/A
10/8  71/67/69/+15/0.23/007/01            33 S   AERO 36 SSW RMY 37
10/9  71/68/70/+16/0.22/000/00            43 S   AERO 41 S   RMY 45
10/10 76/61/69/+15/0.00/637/94            21 WNW AERO 20 WNW RMY 21
10/11 68/55/62/+9/0.00/169/25             29 ENE AERO 25 ENE RMY 29
10/12 58/48/50/0/T/545/81                 30 NE  AERO 28 ENE RMY 30
10/13 64/48/56/+3/0.00/637/95             20 E   AERO 16 E   RMY 17
10/14 66/54/60/+8/0.04/067/10             15 SSE AERO 13 SSE RMY 13
10/15 72/58/65/+13/0.01/146/22            39 SSW AERO 36 SSW RMY 40
10/16 66/39/53/+2/T/007/01                28 NNW AERO 25 NNW RMY 29
10/17 57/35/46/-5/0.00/659/100            25 S   AERO 22 S   RMY 25
10/18 70/45/58/+7/0.00/649/99             25 SW  AERO 23 SW  RMY 22
10/19 72/52/62/+12/0.00/614/94            31 SSW AERO 30 SSW RMY 32
10/20 68/53/61/+11/0.00/651/100           28 WNW AERO 25 WNW RMY 29
10/21 77/52/65/+15/0.00/648/100           21 NW  AERO 20 NW  RMY 18
10/22 73/54/64/+15/0.00/561/80            21 ENE AERO 16 ENE RMY 17
10/23 69/50/60/+11/T/103/16               24 SSE AERO 24 SSE RMY N/A
10/24 73/64/69/+20/0.25/032/05            50 SSE AERO 51 S   RMY N/A
10/25 69/57/63/+14/1.57/000/00            50 SSW AERO 50 SSW RMY N/A
10/26 60/44/52/+4/0.50/000/00             40 W   AERO 41 W   RMY 39
10/27 60/42/51/+3/0.00/632/100            28 W   AERO 25 W   RMY N/A
10/28 66/47/57/+9/0.00/548/87             24 S   AERO 23 S   RMY 26
10/29 62/55/59/+12/1.47/000/00            62 ESE AERO 63 ESE RMY N/A
10/30 63/48/56/+9/1.65/193/31             73 SE  AERO 68 SE  RMY N/A
10/31 56/43/50/+3/0.00/622/100            35 WSW AERO 33 WSW RMY 35

DAILY RECORDS FOR OCTOBER

10/8/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 67F,
BREAKS PREVIOUS RECORD OF 60F SET IN 1944

10/9/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 68F,
BREAKS PREVIOUS RECORD OF 61F SET IN 2011

10/9/17: MONTHLY RECORD HIGH MINIMUM TEMPERATURE OF 68F,
BREAKS PREVIOUS RECORD OF 67F SET ON OCTOBER 13, 1990
AND TIED ON OCTOBER 8, 2017

10/24/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 64F,
BREAKS PREVIOUS RECORD OF 61F SET IN 2001

10/30/17: DAILY MAXIMUM PEAK GUST 63 KTS (73 MPH) SE
BREAK PREVIOUS RECORD OF 57 KTS (66 MPH) NW SET IN 1963

PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 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

11/1 53/39/46/0/0.00/…/..               25 SE  AERO 24 SE  RMY 25
11/2 71/49/60/+14/0.00/…/..             28 SSE AERO 25 SSE RMY 27
11/3 74/47/61/+15/T/…/..                35 WNW AERO 35 WNW RMY 38
11/4 54/39/47/+2/0.00/…/..              31 NW  AERO 31 NW  RMY N/A
11/5 61/46/54/+9/…/…/..               26 S   AERO 24 S   RMY N/A
11/6 64/47/56/+11/…/…/..              32 S   AERO 28 SSW RMY 35
11/7 46/35/41/-4/…/…/..               26 NNW AERO 23 N   RMY 26

11/8 Low temp since midnight is 34F; normal low is now 36F

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

RECORDS FOR NOVEMBER 8
HIGH 72 IN 1938
LOW 20 IN 1921
PRECIP 2.24 INCHES IN 1972
SNOWFALL 4.0 IN 1894
PEAK GUST 72e SE IN 1947

RECORDS FOR NOVEMBER 9
HIGH 72 IN 1975
LOW 17 IN 1971
PRECIP 1.37 INCHES IN 1969
SNOWFALL 0.2 IN 1921,1923
PEAK GUST 73e S IN 1943

TODAY’S REPORT PREPARED BY: Afshin Pourmokhtarian / Kaitlin Geagan