Sunday, November 17, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, NOVEMBER 17, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

PERFECT VISIBILITY THIS MORNING FOLLOWED BY
SOME LIGHT AFTERNOON SNOWFALL….

Today’s weather conditions were overcast and dry, with
a perfect visibility of 90 miles seen this morning. Winds
have been northerly and steady, at an average speed of
10 mph. The relative humidity has stayed around 70%,
with dew points in the mid 20’s.

Snowfall began shortly after the 10 A.M. observation, but
was very light and left only a trace.

The high so far today is 34F, 16 degrees below the daily
normal maximum of 50F. The low since midnight is 21F,
12 degrees below the normal minimum of 33F.

PRELIMINARY STATS FOR OCTOBER 2019

TEMPERATURE, Deg. F
Avg. Max. 60.5 [+0.2] Avg. Min. 46.7 [+3.8] Mean      53.6 [+2.0] 24-hour corrected mean: 53.3
Max. for month: 77F on the 7th
Min. for month: 35F on the 5th

HEATING DEGREE DAYS
Total heating units:   347  [-74] Total for the season:  440 [-123] Total for last season: 543

PRECIPITATION, Inches
Total: 6.92 [+2.23] Greatest in 24 hrs: 1.96 ins. on the 16th-17th

WIND, mph
Avg. uncorrected wind speed: 12.2 mph
Avg. corrected wind speed:   12.6 mph
Prevailing wind direction:   NE [13%] Peak gust and direction:     61 S,E on the 17th, 31st

SUNSHINE:
Campbell-Stokes card minutes: 7074 minutes of possible 19824 or 36%
Astronomical total minutes: 7330 minutes of possible 20566 or 36%

This was the second cloudiest October on record!

BHO Lowest October Sunshine, hours (1886-2019):

1) 80.5 in 1913  [24%] 2) 117.9 in 2019  [36%] 3) 120.3 in 1896  [36%] 4) 121.6 in 1919  [37%] 5) 124.9 in 1888  [38%]

Today’s Observations:

7 A.M.
Weather: Broken stratocumulus, overcast cirrostratus
Temperature: 25F; Dew Point: 17F; Wind: N at 8 kts,
Sea-level pressure: 29.62 ins. Hg, falling steadily
Visibility: 90 miles, looming along horizon below
inversion
6-hr Max temp: 25F
6-hr Min temp: 21F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 E40 BKN 250 OVC 90 030/25/17/3608/962/ LOOMING ALG
HRZN BLO INVSN ALQDS/ 8/408 58005 10025 20021

10 A.M.
Weather: Broken stratocumulus, overcast cirrostratus
Temperature: 30F; Dew Point: 24F; Wind: N at 8 kts,
Sea-level pressure: 29.62 ins. Hg, falling then rising
Visibility: 85 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E40 BKN 250 OVC 85 032/30/24/3608/962/ LOOMING ALG
HRZN BLO INVSN ALQDS/ 8/408 50002

1 P.M.
Weather: Very light snow, overcast stratus
Temperature: 34F; Dew Point: 27F; Wind: N at 7 kts
Sea-level pressure: 29.53 ins. Hg, falling then falling more slowly
Visibility: 35 miles, distant fog
6-hr Max temp: 34F
6-hr Min temp: 25F
6-hr Precip: Trace
BHO SA 1755 E40 OVC 35S- 005/34/27/0107/953/ DSNT FG ALQDS S-CTD
PCPN VRY LGT/ 8/6// 600// 57027 10034 20025

SUMMARY FOR SATURDAY, NOVEMBER 16, 2019

TEMPERATURE (DEGREES F)
MAX…..35   NORMAL…..50
MIN…..22   NORMAL…..34
MEAN….29   NORMAL…..42

DEPARTURE FROM 30-YEAR NORMAL……………….-13
TOTAL DEPARTURE FOR THE MONTH……………….-72 [-4.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………36  DEPARTURE……..+13
TOTAL HEATING UNITS FOR THE MONTH…………..421  DEPARTURE……..+86
TOTAL HEATING UNITS FOR THE SEASON………….861  DEPARTURE……..-37
TOTAL HEATING UNITS LAST SEASON TO DATE……..882  DEPARTURE……..-21

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..35 NNW AT  3:05 A.M.
AERO…………………….35 NNW AT  3:06 A.M
ASOS…………………….36 NW  AT  3:05 A.M.
DAVIS……………………36 NW  AT  3:03 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….27 N   AT  4:24 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….26 NW  AT  3:07 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………27 NNW AT  3:05 A.M.
AVERAGE WIND SPEED AND DIRECTION……………11.8 NNW
ASOS……………………11.9
DAVIS…………………..12.2 N [350 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……….0.80  DEPARTURE……-1.71
ASOS…………..0.84
TOTAL PRECIPITATION FOR THE YEAR……….46.14  DEPARTURE……-0.15
ASOS………….46.31

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.1
TOTAL SNOWFALL FOR THE MONTH…………….0.1  DEPARTURE…….-0.5
TOTAL SNOWFALL FOR THE SEASON……………0.1  DEPARTURE…….-0.8

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/+3/0.06/028/04               28 SW  AERO 25 SSW RMY 29
10/02  74/49/62/+5/0.42/021/03               30 ENE AERO 25 ENE RMY 28
10/03  51/46/49/-7/0.06/000/00               28 ENE AERO 26 ENE RMY N/A
10/04  59/40/50/-6/0.05/397/57               38 NNW AERO 38 NNW RMY 38
10/05  58/35/47/-9/0.00/687/99               21 N   AERO 18 SSW RMY N/A
10/06  65/44/55/0/0.00/263/38                36 SSW AERO 35 SSW RMY N/A
10/07  77/57/67/+12/0.12/316/46              47 SSW AERO 46 SSW RMY 49
10/08  60/52/56/+2/T/000/00                  22 NE  AERO 18 NW  RMY N/A
10/09  55/49/52/-2/0.11/000/00               43 NE  AERO 37 NE  RMY 44
10/10  54/47/51/-3/0.20/000/00               41 NE  AERO 37 NE  RMY 42
10/11  52/48/50/-3/1.36/000/00               41 NE  AERO 39 NE  RMY 41
10/12  52/49/51/-2/0.28/000/00               39 NE  AERO 37 NE  RMY N/A
10/13  66/48/57/+4/0.00/570/85               18 WNW AERO 17 WNW RMY 18
10/14  67/51/59/+7/0.00/335/50               18 WSW AERO 17 WSW RMY N/A
10/15  61/43/52/0/0.00/653/98                18 NNW AERO 17 NNW RMY N/A
10/16  61/45/53/+2/0.69/305/46               58 ESE AERO 58 ESE RMY N/A
10/17  60/46/53/+2/1.27/086/13               61 E   AERO 63 E   RMY N/A
10/18  57/41/49/-2/0.00/099/15               29 WNW AERO 32 W   RMY 32
10/19  58/36/47/-3/0.00/648/99               18 NW  AERO 18 NW  RMY 19
10/20  60/43/52/+2/T/280/43                  14 NE  AERO 16 NE  RMY N/A
10/21  59/49/54/+4/0.01/591/91               25 E   AERO 21 NE  RMY 23
10/22  58/47/53/+4/0.14/078/12               29 E   AERO 28 E   RMY 23
10/23  65/48/57/+8/0.27/431/67               35 W   AERO 35 W   RMY 36
10/24  67/43/55/+6/0.00/635/99               28 SSW AERO 28 SSW RMY 29
10/25  64/47/56/+7/T/217/34                  20 WSW AERO 21 SW  RMY N/A
10/26  58/45/52/+4/0.01/502/79               20 N   AERO 18 N   RMY N/A
10/27  52/45/49/+1/1.43/000/00               37 ESE AERO 35 ESE RMY 37
10/28  53/46/50/+2/0.06/050/08               24 NNW AERO 24 NNW RMY N/A
10/29  54/47/51/+4/0.02/000/00               15 ESE AERO 15 ESE RMY 14
10/30  65/51/58/+11/0.14/138/22              24 S   AERO M  M   RMY N/A
10/31  68/58/63/+16/0.22/000/00              61 S   AERO M  M   RMY N/A

PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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

11/01  67/35/51/+5/…./0.0/…/..            67 S   AERO M  M   RMY N/A
11/02  50/31/41/-5/0.00/0.0/…/..            17 WNW AERO 14 W   RMY N/A
11/03  53/35/44/-2/0.00/0.0/…/..            25 WSW AERO 23 W   RMY 26
11/04  53/33/43/-2/0.00/0.0/…/..            24 S   AERO 20 S   RMY 24
11/05  54/44/49/+4/0.33/0.0/…/..            22 S   AERO 18 WNW RMY 28
11/06  51/36/44/-1/0.00/0.0/…/..            28 WSW AERO 23 W   RMY 27
11/07  55/38/47/+2/0.27/0.0/…/..            30 S   AERO 26 SSW RMY 32
11/08  38/23/31/-13/0.00/0.0/…/..           38 NW  AERO 37 WNW RMY 44
11/09  39/20/30/-14/0.00/0.0/…/..           22 S   AERO 18 S   RMY N/A
11/10  51/30/41/-3/0.00/0.0/…/..            30 SW  AERO 30 SW  RMY 31
11/11  52/39/46/+3/T/0.0/…/..               23 NE  AERO 22 NE  RMY 23
11/12  42/20/31/-12/0.08/0.1/…/..           37 WNW AERO 37 WNW RMY 41
11/13  28/15/22/-21/0.00/0.0/…/..           32 WNW AERO 32 WNW RMY 35
11/14  36/17/28/-14/0.00/0.0/…/..           18 SW  AERO 17 SW  RMY 20
11/15  51/32/42/0/0.00/0.0/…/..             25 WNW AERO 25 WNW RMY N/A
11/16  35/22/29/-13/0.00/0.0/…/..           35 NNW AERO 35 NNW RMY N/A

11/17 The low since midnight is 21F, daily normal minimum is 33F

DAILY RECORDS FOR NOVEMBER

11/13/19: DAILY RECORD LOW MAXIMUM TEMPERATURE OF 28F,
BREAKS PREVIOUS RECORD OF 30F SET IN 1920.
It was also the third earliest maximum temperature
colder than 30F on record, behind only 28F on 11/8/1894
and 29F on 11/12/1894.

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

RECORDS FOR NOVEMBER 17
HIGH 74 IN 1928
LOW 10 IN 1924
PRECIP 1.92 INCHES IN 1920
SNOWFALL 1.0 INS IN 1980
PEAK GUST 61 SSE IN 2006

RECORDS FOR NOVEMBER 18
HIGH 72 IN 1963
LOW 10 IN 1936
PRECIP 1.80 INS IN 1929
SNOWFALL 6.3 INS IN 1980
PEAK GUST 60 SW IN 1987

TODAY’S REPORT PREPARED BY: Benjamin Turner