Sunday, November 5, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, NOVEMBER 5, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

CLOUDY SKIES THROUGHOUT THE DAY KEPT TEMPERATURES
SEASONABLE…

Temperatures have dropped well away from the near record high
on Friday and are currently sitting in the mid 50s.  Today has
seen higher humidities than yesterday as clouds prevailed and
visibilities were lower.

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 altocumulus with breaks in overcast, few cumulus
distant NW-E
Temperature: 48F; Dew Point: 41F; Wind: E at 10 kts,
Sea-level pressure: 30.38 ins. Hg, falling, then rising
Visibility: 50 miles
6-hr Max temp: 48F
6-hr Min temp: 39F
24-hr precip: 0.00
BHO SA 1155 E90 OVC 50 289/48/41/1010/038/ FEW CU NW-E BINOVC/
8/12/ 55010 10048 20039

10 A.M.
Weather: Broken altocumulus at multiple levels, few cumulus NNW-N
Temperature: 53F; Dew Point: 43F; Wind: SE at 9 kts
Sea-level pressure: 30.36 ins. Hg, falling, then rising
Visibility: 45 miles, 50 SSW-SW
BHO SA 1455 E80 BKN 150 BKN 45 284/53/43/1309/036/ FEW CU NNW-N
VSBY 50 SSW-SW/ 8/19/ 55005

1 P.M.
Weather: Overcast Stratocumulus, few stratus fractus
Temperature: 58F; Dew Point: 47F; Wind: SE at 10 kts,
Sea-level pressure: 30.27 ins. Hg, falling then more rapidly
Visibility: 40 miles
6-hr Max temp: 58F
6-hr Min temp: 48F
BHO SA 1755 E30 OVC 40 252/58/47/1410/027/ OVC SC FEW STFRA
VSBY 35 SE-N DSNT FG 8/7// 58032 10058 20048
SUMMARY FOR SATURDAY, NOVEMBER 4, 2017

TEMPERATURE (DEGREES F)
MAX…..54   NORMAL…..54
MIN…..39   NORMAL…..37
MEAN….47   NORMAL…..45

DEPARTURE FROM 30-YEAR NORMAL……………………+2
TOTAL DEPARTURE FOR THE MONTH……………………+31 [+9.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..18   DEPARTURE………-2
TOTAL HEATING UNITS FOR THE MONTH…………..46   DEPARTURE………-31
TOTAL HEATING UNITS FOR THE SEASON…………314   DEPARTURE……..-326
TOTAL HEATING UNITS LAST SEASON TO DATE…….479   DIFFERENCE…….-165

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….31 NW    AT  1:26 A.M.
AERO……………………31 NW    AT  1:27 A.M.
ASOS……………………33 NNW   AT  1:07 A.M.
DAVIS…………………..31 WNW   AT  1:27 A.M.  RMY M
FASTEST MILE FOR YESTERDAY…………………21 NW    AT  1:27 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………22 NNW   AT  1:27 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..21 NNW   AT  1:28 A.M.
AVERAGE WIND SPEED AND DIRECTION………….9.3 E
ASOS………………….8.7
DAVIS…………………8.9 NE  [41 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.16
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.00  DEPARTURE……-0.63
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE YEAR……….47.80  DEPARTURE……+3.40
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/+11/0.00/103/16            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/…/000/00             50 SSW AERO 50 SSW RMY N/A
10/26 60/44/52/+4/…/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/…/000/00             62 ESE AERO 63 ESE RMY N/A
10/30 63/48/56/+9/…/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 M

11/5 Low temp since midnight is 46F; normal low is now 37F

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

RECORDS FOR NOVEMBER 5
HIGH 76 IN 1994
LOW 18 IN 1908
PRECIP 4.26 INCHES IN 1955
SNOWFALL 1.5 IN 1892
PEAK GUST 69 W IN 2004

RECORDS FOR NOVEMBER 6
HIGH 71 IN 1959, 2015
LOW 22 IN 1951
PRECIP 1.72 INCHES IN 1907
SNOWFALL 8.0 IN 1894
PEAK GUST 63 W IN 1973

TODAY’S REPORT PREPARED BY: Robert Millette