Sunday, November 11, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, NOVEMBER 11, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

COOL CLEAR DAY WITH DRY CONDITIONS AND GOOD VISIBILITY…

Visibility has remained at 80 miles throughout the day today.
Temperatures have risen to 42F, 10 degrees below our normal
daily maximum of 52F. Humidity readings at each observation have
remained fairly low, leaving for clear skies without any
clearly visible signs of haze. We experienced a pretty large
rise in pressure from yesterday morning through today at 7 A.M.
of 0.511 inches of mercury. The low since midnight was 30F, 5
degrees below our normal minimum temperature of 35F.

PRELIMINARY STATS FOR OCTOBER 2018

TEMPERATURE, Deg. F
Avg. Max. 58.0 [-2.3] Avg. Min. 42.7 [-0.2] Mean 50.4 [-1.2] 24-hour corrected mean: 50.2
Max. for month: 82F on the 10th
Min. for month: 27F on the 22nd and 26th

HEATING DEGREE DAYS
Total heating units: 457 [+36] Total for the season: 544 [-19] Total for last season: 268

PRECIPITATION, Inches
Total: 5.85 in. [+1.16] Greatest in 24 hrs: 2.08 inches on October 27

WIND, mph
Avg. uncorrected wind speed: 11.6 mph
Avg. corrected wind speed: 12.0
Prevailing wind direction: W [14% of total hours] Peak gust and direction: 54 NE

SUNSHINE:
Campbell-Stokes card minutes: 7800 minutes of possible 19824 or 39%
Astronomical total minutes: 8090 minutes of possible 20544 or 39%

Today’s Observations:

7 A.M.
Weather: Clear, few stratus S-W, few cumulus in all
directions
Temperature: 30F; Dew Point: 19F; Wind: W at 11G20 kts
Sea-level pressure: 30.24 ins. Hg, rising unsteadily
Visibility: 80 miles
6-hr Max temp: 31F
6-hr Min temp: 30F
24-hr Precip: 0.05 ins.
BHO SA 1155 CLR 80 239/30/19/2811G20/024/ FEW ST S-W FEW CU
ALQDS/ 8/100 51027 70005 10031 20030

10 A.M.
Weather: Clear, few cumulus and cirrus in all directions
Temperature: 37F; Dew Point: 21F; Wind: WNW at 16G25 kts
Sea-level pressure: 30.26 ins. Hg, rising then falling
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 80 245/37/21/2916G25/026/ FEW CU ALQDS
FEW CI ALQDS/ 8/101 50006

1 P.M.
Weather: Scattered stratocumulus, broken stratocumulus
Temperature: 42F; Dew Point: 19F; Wind: WNW at 15G22 kts
Sea-level pressure: 30.22 ins. Hg, falling, then more quickly
Visibility: 80 miles
6-hr Max temp: 42F
6-hr Min temp: 30F
6-hr Precip: 0.00 ins.
BHO SA 1755 CLR 80 232/42/19/2915G22/022/ FEW DSNT CU ALQDS/
8/100 58012 10042 20030

SUMMARY FOR SATURDAY, NOVEMBER 10, 2018

TEMPERATURE (DEGREES F)
MAX…..45   NORMAL…..52
MIN…..32   NORMAL…..35
MEAN….39   NORMAL…..44

DEPARTURE FROM 30-YEAR NORMAL…………………..-5
TOTAL DEPARTURE FOR THE MONTH………………….+41 [+3.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..26   DEPARTURE………+5
TOTAL HEATING UNITS FOR THE MONTH………….159   DEPARTURE……..-41
TOTAL HEATING UNITS FOR THE SEASON…………703   DEPARTURE……..-60
TOTAL HEATING UNITS LAST SEASON TO DATE…….440   DIFFERENCE……+263

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..45 W   AT 5:35 P.M.
AERO…………………….47 W   AT 4:56 P.M.
ASOS…………………….48 W   AT 5:26 P.M.
DAVIS……………………49 WNW AT 4:58 P.M. RMY 46
FASTEST MILE FOR YESTERDAY………………….35 WNW AT 5:34 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….33 W   AT 5:37 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………38 W   AT 5:34 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..18.0 W
ASOS…………………..17.1
DAVIS………………….18.2 WNW  [301 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.05  DEPARTURE…….-0.11
ASOS…………..0.04
TOTAL PRECIPITATION FOR THE MONTH……….4.91  DEPARTURE…….+3.36
ASOS…………..5.08
TOTAL PRECIPITATION FOR THE YEAR……….57.95  DEPARTURE……+12.81
ASOS………….59.94

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 65/53/59/+2/0.22/042/06         21 ENE AERO 18 SSW RMY N/A
10/02 64/53/59/+2/0.77/000/00         33 S   AERO 32 S   RMY 35 TSTM
10/03 60/52/56/0/0.33/000/00          18 NNE AERO 14 NNE RMY 14
10/04 69/57/63/+7/0.00/209/30         29 SSW AERO 29 SSW RMY 32
10/05 64/47/56/0/0.00/638/92          25 NE  AERO 21 NE  RMY 24
10/06 64/45/55/0/0.00/276/40          23 SSW AERO 23 SSW RMY 25
10/07 75/56/66/+11/0.05/076/11        28 NE  AERO 24 ENE RMY 27
10/08 56/53/55/+1/0.03/000/00         22 ENE AERO 20 ENE RMY N/A
10/09 75/56/66/+12/0.00/211/31        26 WSW AERO 28 SW  RMY 29
10/10 82/65/74/+20/0.00/496/73        24 WSW AERO 23 WSW RMY 25
10/11 70/56/63/+10/0.78/000/00        48 NNE AERO 47 NNE RMY 50
10/12 59/44/52/-1/0.31/182/27         32 NW  AERO 32 NW  RMY 33
10/13 49/40/45/-8/0.17/114/17         21 WNW AERO 20 WNW RMY 20
10/14 55/37/46/-6/0.00/127/19         21 W   AERO 18 W   RMY 21
10/15 66/44/55/+3/0.06/033/05         46 W   AERO 46 W   RMY N/A
10/16 56/41/49/-2/0.03/622/94         48 W   AERO 48 W   RMY N/A
10/17 60/39/50/-1/0.01/587/89         48 W   AERO 50 W   RMY 53
10/18 45/33/39/-12/0.00/657/100       32 WNW AERO 35 WNW RMY 36
10/19 60/31/46/-4/0.00/602/92         33 SSW AERO 36 SSW RMY 36
10/20 62/46/54/+4/0.00/228/35         35 SSW AERO 37 SSW RMY 33
10/21 46/31/39/-11/0.02/363/56        39 NNW AERO 41 NW  RMY 41
10/22 50/27/39/-10/0.00/497/77        24 W   AERO 22 W   RMY 21
10/23 53/40/47/-2/0.51/103/16         29 WNW AERO 29 WNW RMY 29  TSTM
10/24 45/35/40/-9/0.03/096/15         31 NW  AERO 31 NW  RMY 32
10/25 48/32/40/-9/0.00/510/80         35 NW  AERO 35 NW  RMY 36
10/26 45/27/36/-12/0.00/610/96        20 NW  AERO 19 NW  RMY N/A
10/27 48/38/43/-5/2.08/000/00         54 NE  AERO 55 NE  RMY 55
10/28 51/40/46/-2/0.07/000/00         23 NNE AERO 23 NNE RMY N/A TSTM
10/29 55/40/48/+1/0.37/138/22         30 WSW AERO 30 WSW RMY 34
10/30 45/34/40/-7/0.00/306/49         28 NW  AERO 28 NW  RMY 30
10/31 55/32/44/-3/0.01/367/59         35 SSW AERO 36 SSW RMY 37

DAILY RECORDS FOR OCTOBER

10/10/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 65F,
BREAKS PREVIOUS RECORD OF 62F SET IN 1949

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

11/01 65/49/57/+11/…./…/..         25 SSW AERO 24 SSW RMY N/A
11/02 65/52/59/+13/…./…/..         37 SSW AERO 41 SSW RMY N/A
11/03 64/42/53/+7/…./…/..          59 W   AERO 60 W   RMY 58
11/04 52/37/45/0/…./…/..           31 W   AERO 30 W   RMY N/A
11/05 49/40/45/0/…./…/..           30 ENE AERO 29 ENE RMY 28
11/06 58/45/52/+7/…./…/..          29 SSW AERO 29 SSW RMY 31
11/07 60/50/55/+10/…./…/..         30 WSW AERO 30 WSW RMY 32
11/08 52/37/45/+1/…./…/..          29 WNW AERO 26 WNW RMY 23
11/09 48/34/41/-3/…./…/..          43 E   AERO 40 E   RMY 42
11/10 45/32/39/-5/…./…/..          45 W   AERO 47 WNW RMY 46

11/11 Low temp since midnight is 30F; normal low is 35F

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

RECORDS FOR NOVEMBER 11
HIGH 68 IN 1984
LOW 17 IN 1956
PRECIP 1.14 INCHES IN 1991
SNOWFALL 2.5 IN 1986
PEAK GUST 64 NW IN 1962

RECORDS FOR NOVEMBER 12
HIGH 74 IN 1909
LOW 18 IN 1926
PRECIP 3.25 INCHES IN 1947
SNOWFALL 8.1 INCHES IN 1987
PEAK GUST 79e MPH NW IN 1947

TODAY’S REPORT PREPARED BY: Samantha Richard