Wednesday, December 2, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, DECEMBER 2, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

SHOWERS MOVE THROUGH THE REGION IN ROUNDS,
0.26 INCHES OF NEW RAIN BY THE 1:00 PM EST OBSERVATION

Showers began to come down in a steadier fashion around 6:00
PM EST last evening, with 0.17 inches of new rain by this
morning’s 7:00 AM EST observation. Thick fog has hung in place
reducing visibility to 1/4 of a mile for the majority of this
morning, as rain showers began once more.

By the 1:00 PM EST observation an additional 0.09 inches
of new rain had fallen, with very light rain showers occurring.
Thick fog was still limiting visibility to 1/4 of a mile.
BHO Warmest Novembers, deg F (1885-2015):

1) 47.9 in 2011
2) 47.4 in 1975
3) 47.1 in 2006
4) 46.4 in 1948
46.4 in 1979
46.4 in 2009
7) 46.1 in 2015
8) 46.0 in 2001
9) 45.7 in 1953
45.7 in 1999
PRELIMINARY STATS FOR OCTOBER 2015

TEMPERATURE, Deg. F
Avg. Max. 54.3 [+4.3] Avg. Min. 38.6 [+5.1] Mean      46.5 [+4.8] Corrected mean: 46.1
Max. for month: 72 on 5th
Min. for month: 23 on 24th

COOLING DEGREE DAYS
Total cooling units: 1 [+1] Total for the season: 811 [+209] Total for last season: 595

HEATING DEGREE DAYS
Total heating units: 548 [-150] Total for the season: 1002 [-259] Total for last season: 1159

PRECIPITATION, Inches
Total: 2.59 [-2.18] Greatest in 24 hrs: 1.18 from 20th
Snowfall: Trace [-2.3] Seasonal: Trace [-2.6]

WIND, mph
Avg. uncorrected wind speed: 12.4
Avg. corrected wind speed: 12.7
Prevailing wind direction: W @ 13%
Peak gust and direction: 43 SSE on the 20th

SUNSHINE:
Campbell-Stokes card minutes: 9222/17010 or 54%
Astronomical total minutes:   9562/17644 or 54%

Today’s Observations:

7 A.M.
Weather: Thick fog
Temperature: 37F; Dew Point: 37F; Wind: estimated NW at 4 kts
Wind Speed: Light
Sea-level pressure: 29.95 ins. Hg, falling, then more slowly
Visibility: 1/4 mile, thick fog
6-hr Max temp: 41F
6-hr Min temp: 37F
24-hr precip: 0.17 inches
BHO SA 1155 W3 X 1/4F 142/37/37/E3204/995/ WND LGT/ 8////
56002 ASOS 70016 MANUAL 70017 10041 20037

10 A.M.
Weather: Light rain shower, thick fog
Temperature: 39F; Dew Point 39F; Wind: estimated SSE at 5 kts,
Wind Speed: Light
Sea-level pressure: 29.93 ins. Hg, falling, then more quickly
Visibility: 1/4 mile, light rain shower, thick fog
3-hr precip: 0.01 inches
BHO SA 1455 W3 X 1/4RW-F 137/39/39/E1505/993/ WND LGT/ 8////
58005 ASOS 60001 MANUAL 60001

1 P.M.
Weather: Light rain shower, thick fog
Temperature: 42F; Dew Point 42F; Wind: SSW at 7 kts,
Sea-level pressure: 29.87 ins. Hg, falling, then more slowly
Visibility: 1/4 mile, thick fog, light rain shower
6-hr max. temp: 43F
6-hr min. temp: 37F
6-hr precip: 0.09 inches
BHO SA 1755 W3 X 1/4RW-F 114/42/42/2007/987/ 8//// 56023
ASOS 60009 MANUAL 60009 10043 20037
SUMMARY FOR TUESDAY, DECEMBER 1, 2015

TEMPERATURE (DEGREES F)
MAX…..42   NORMAL…..44
MIN…..30   NORMAL…..29
MEAN….36   NORMAL…..37

DEPARTURE FROM 30-YEAR NORMAL………………….-1
TOTAL DEPARTURE FOR THE MONTH………………….-1  [-1.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..29   DEPARTURE……….+0
TOTAL HEATING UNITS FOR THE MONTH…………..29   DEPARTURE……….+0
TOTAL HEATING UNITS FOR THE SEASON………..1031   DEPARTURE……..-259
TOTAL HEATING UNITS LAST SEASON TO DATE……1174   DIFFERENCE…….-143

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….19 NNE  AT  11:46 P.M.*
ASOS……………………18 ESE  AT   6:49 A.M.
DAVIS…………………..17 SSE  AT   3:27 A.M. RMY 19
FASTEST MILE FOR YESTERDAY…………………13 NNE  AT  11:45 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………14 NNE  AT  11:52 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..14 SSE  AT   5:33 A.M.
AVERAGE WIND SPEED AND DIRECTION…………….9.9 SE
ASOS……………………10.2
DAVIS……………………9.0 SE [128 Deg.] * Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.17  DEPARTURE……+0.01
ASOS……………0.16
TOTAL PRECIPITATION FOR THE MONTH………..0.17  DEPARTURE……+0.01
ASOS……………0.16
TOTAL PRECIPITATION FOR THE YEAR………..39.59  DEPARTURE……-9.11
ASOS…………….N/A ***
*** ASOS annual total not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER & DECEMBER CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY 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

11/1  59/45/52/+6/T/006/01                  30 SSW RMY 31
11/2  62/47/55/+9/0.00/476/77               24 W   RMY N/A
11/3  71/44/58/+12/0.00/616/100             25 W   RMY 25
11/4  66/49/58/+13/0.00/601/98              22 SSW RMY N/A
11/5  72/51/62/+17/0.00/281/46              31 SW  RMY 36
11/6  71/60/66/+21/0.00/109/18              35 SSW RMY 38
11/7  64/46/55/+10/0.00/029/04              33 WNW RMY 35
11/8  54/39/47/+3/0.00/591/98               26 NW  RMY 30
11/9  59/38/49/+5/0.00/577/96               20 W   RMY 21
11/10 53/45/49/+5/…./000/00               28 NE  RMY N/A
11/11 48/43/46/+3/…./000/00               41 NE  RMY N/A
11/12 55/42/49/+6/…./000/00               28 S   RMY 30
11/13 57/41/49/+6/…./385/65               40 WSW RMY 47
11/14 45/31/38/-4/0.00/425/72               40 NW  RMY 47
11/15 51/31/41/-1/0.00/241/41               25 W   RMY 27
11/16 59/36/48/+6/0.00/416/71               25 NNW RMY 29
11/17 45/28/37/-4/0.00/572/98               18 NNE RMY N/A
11/18 50/35/43/+2/0.00/575/99               17 SSE RMY N/A
11/19 55/38/47/+6/…./000/00               29 SSE RMY N/A
11/20 58/41/50/+10/…./416/72              43 SSE RMY N/A
11/21 46/35/41/+1/0.00/380/66               20 ENE RMY 21
11/22 45/35/40/+0/…./000/00               26 NW  RMY 28
11/23 40/25/33/-6/0.00/543/95               24 NW  RMY 29
11/24 42/23/33/-6/0.00/564/99               20 WSW RMY 19
11/25 46/31/39/+0/0.00/568/100              18 SSE RMY N/A
11/26 58/37/48/+10/0.00/386/68              33 S   RMY 35
11/27 63/48/54/+18/0.00/249/44              35 SW  RMY 38
11/28 55/38/47/+9/0.19/000/00               23 SW  RMY N/A
11/29 42/28/35/-2/0.00/410/73               17 NNW RMY 21
11/30 37/27/32/-5/T/T/151/27                17 S   RMY 18

12/1  42/30/36/-1/…./000/00               19 NNE RMY 19

12/2 low since midnight is 37F; normal low is now 28F

DAILY RECORDS FOR NOVEMBER AND DECEMBER 2015

**11/6 DAILY RECORD MAXIMUM TEMPERATURE OF 71F
TIES PREVIOUS RECORD OF 71F SET IN 1959

**11/6 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 60F
BREAKS PREVIOUS RECORD OF 58F SET IN 1938

**11/6 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 60F
TIES PREVIOUS MONTHLY RECORD OF 60F SET ON
11/8/1996

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

RECORDS FOR DECEMBER 2
HIGH 61 IN 1998
LOW 3 IN 1890
PRECIP 2.09 INS. IN 1974
SNOWFALL 5.0 INS. IN 1894, 1929
PEAK GUST 89e MPH SSE IN 1942

RECORDS FOR DECEMBER 3
HIGH 67 IN 2009
LOW  -1 IN 1890
PRECIP 2.10 INS. IN 1986
SNOWFALL 6.0 INS. IN 1963
PEAK GUST 73e MPH W IN 1942

TODAY’S REPORT PREPARED BY: Brian Fitzgerald