Wednesday, November 1, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, NOVEMBER 1, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

DRY, COOL AND LIGHT WIND DAY

As high pressure moves into the area we are
experiencing light winds and very dry air.
Winds were coming from the WNW overnight have
now shifted to E/NE. Humidity reached a low
of 42% at 10:00 am but is now on the rise
and we had a humidity of 55% at 1:00 P.M.
As the humidity rose it began to limit the
visibility from 75 miles to 65 miles especially
to the West.
October was an above average month of temperatures
but we have no returned to more seasonable
temps. with a high of 56F yesterday and
a high of 52F by 1:00 PM EST. The normal for
daily maximum is 55F. Of overnight temperature
of 39F is also close to the normal of 38F.

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 13%
Peak gust and direction: 73 SE on 30th

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

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: Scattered altocumulus, broken cumulus
Temperature: 42F; Dew Point: 26F; Wind: NNW at 4 kts,
Wind: Light
Sea-level pressure: 30.36 ins. Hg, rising, then more quickly
Visibility: 75 miles
6-hr Max temp: 42F
6-hr Min temp: 39F
24-hr precip: 0.00
BHO SA 1155 14 SCT E250 BKN 75 282/42/26/3304/036/ WND LGT/
8/066 53022 10042 20039

10 A.M.
Weather: Overcast altostratus
Temperature: 49F; Dew Point: 27F; Wind: ESE at 5 kts,
Wind: Light
Sea-level pressure: 30.40 ins. Hg, rising then steady
Visibility: 75 miles, distant haze in all directions
BHO SA 1455 E10 OVC 75 293/49/27/1205/040/ DSNT HZ ALQDS
WND LGT/ 8/010 51011

1 P.M.
Weather: Broken altocumulus, broken altostratus
Temperature: 52F; Dew Point: 37F; Wind: ENE at 3 kts,
Wind: Light
Sea-level pressure: 30.37 ins. Hg, falling, then more slowly
Visibility: 65 miles, distant haze in all directions
6-hr Max temp: 52F
6-hr Min temp: 42F
BHO SA 1755 E80 BKN 13 BKN 65 286/52/37/E0703/037/ DSNT HZ
ALQDS WND LGT/ 8/070 56007 10052 20042

SUMMARY FOR TUESDAY, OCTOBER 31, 2017

TEMPERATURE (DEGREES F)
MAX…..56   NORMAL…..55
MIN…..43   NORMAL…..38
MEAN….50   NORMAL…..47

DEPARTURE FROM 30-YEAR NORMAL…………………….+3
TOTAL DEPARTURE FOR THE MONTH…………………..+263 [+8.3 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………..0
TOTAL COOLING UNITS FOR THE MONTH…………..24   DEPARTURE………+19
TOTAL COOLING UNITS FOR THE SEASON…………731   DEPARTURE……..+129
TOTAL COOLING UNITS LAST SEASON TO DATE…….901   DEPARTURE……..-170

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..15   DEPARTURE……….-3
TOTAL HEATING UNITS FOR THE MONTH………….175   DEPARTURE……..-246
TOTAL HEATING UNITS FOR THE SEASON…………268   DEPARTURE……..-295
TOTAL HEATING UNITS LAST SEASON TO DATE…….421   DEPARTURE……..-153

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….35 WSW   AT  1:00 P.M.
AERO……………………33 WSW   AT  1:00 P.M.
ASOS……………………36 W     AT  1:01 P.M.
DAVIS…………………..34 W     AT  1:01 P.M.  RMY 35
FASTEST MILE FOR YESTERDAY………………….M ****
MAXIMUM 2-MINUTE ASOS AVERAGE………………23 W    AT   1:00 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..24 W    AT   1:00 P.M.
AVERAGE WIND SPEED AND DIRECTION………….14.5 W
ASOS………………….14.6
DAVIS…………………13.4 W  [260 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.16
ASOS…………..0.01
TOTAL PRECIPITATION FOR THE MONTH……….0.00  DEPARTURE……-0.16
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE YEAR……….47.80  DEPARTURE……+4.03
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings
**** Contacting Anemometer down

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/+11/0.00/103/16            24 SSE AERO 24 SSE RMY N/A
10/24 73/64/69/+20/…/032/05             50 SSE AERO 51 S   RMY N/A
10/25 69/57/63/+14/…/…/..             50 SSW AERO 50 SSW RMY N/A
10/26 60/44/52/+4/…/…/..              40 W   AERO 41 W   RMY 39
10/27 60/42/51/+3/0.00/…/..             28 W   AERO 25 W   RMY N/A
10/28 66/47/57/+9/0.00/…/..             24 S   AERO 23 S   RMY 26
10/29 62/55/59/+12/…/…/..             62 ESE AERO 63 ESE RMY N/A
10/30 63/48/56/+9/…/…/..              73 SE  AERO 68 SE  RMY N/A
10/31 56/43/50/+3/0.00/…/..             35 WSW AERO 33 WSW RMY 35

11/1 Low temp since midnight is 39F; normal low is now 38F

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

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

RECORDS FOR NOVEMBER 1
HIGH 75 IN 2003
LOW 22 IN 1913,1923
PRECIP 2.93 INCHES IN 1985
SNOWFALL TRACE IN 1906,1951
PEAK GUST 78 ESE IN 1997

RECORDS FOR NOVEMBER 2
HIGH 81 IN 1950
LOW 22 IN 1965
PRECIP 1.67 INCHES IN 1970
SNOWFALL 1.8 IN 2014
PEAK GUST 63 WSW IN 1973

TODAY’S REPORT PREPARED BY: Kaitlin Ann Geagan