Wednesday, December 3, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, DECEMBER 3, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

TUESDAY 24HR MAX OF 37F RECORDED AT 12:00 AM,
TRACE OF FROZEN PRECIP COMES IN AFTERNOON

Yesterday’s temperatures seemed to mimic the roller coaster
of weather observed in the region recently, with a maximum
of 37F recorded at midnight in the morning, with temperatures
falling during the afternoon, then climbing once more in
the evening.

This morning a maximum of 42F was recorded before temperatures
fell once more to 35F for the 7:00 AM EST observation. Light
drizzle and thick fog was present as well, with visibility
reduced to 1/16 of a mile and only 200 feet of vertical
visibility. 0.33 inches of liquid was recorded by the 7:00
AM EST observation as well, with light drizzle present.

An additional 0.02 inches of precipitation fell between 7:00 AM
and 1:00 PM EST with temperatures rising through the 40s.
A maximum of 47F was recorded by the 1:00 PM EST observation.

Monthly statistics are being compiled below. Please note some
of these statistics have yet to be finalized. Check back
in the coming days for final monthly statistics or visit
BlueHill.org.

NOVEMBER 2014 PRELIMINARY STATS
[Departures are relative to the 1981-2010 normal]

TEMPERATURE [deg. F]

Av. Max. 48.0 [-2.0] Av. Min. 32.2 [-1.3] Mean     40.1 [-1.6] 24-hour corr. mean: 40.3
Max. temp. for month: 66 on 5th
Min, temp. for month: 17 on 29th
Total heating degree day units: 737 [+39] Total seasonal heating   units: 1159 [-102]

PRECIPITATION [ins.] Total: 6.21 [+1.45] Greatest one calendar day: 1.77 [26th] Greatest in 24 hours: 1.81 [26-27th] Snow: 8.7 [+6.4] Total Season Snow: 8.7 [+6.1] Greatest one calendar day: 3.5 [14th] Greatest in 24 hours: 3.5 [13-14th]

WIND
Av. wind speed:       13.1 MPH
Av. corr. wind speed: 13.4 MPH
Prevailing direction: W @ 15%

SUNSHINE
Total astronomical minutes: 8114 of 17626 possible, or 46%
Total Campbell Stokes card minutes: 7818 of 17010 possible, or 46%

Today’s Observations:

7 A.M.
Weather: Light drizzle, thick fog
Temperature: 35F; Dew Point: 35F; Wind: NNW at 7 kts
Sea-level pressure: 30.12 ins. Hg, falling, then more slowly
Visibility: 1/16 of a mile, obscured by thick fog
6-hr max temp: 42F
6-hr min temp: 35F
24-hr precip: 0.33 in.
24-hr snowfall: T in.
Total snow on ground: 0
BHO SA 1155 W2 X 1/16L-F 201/35/35/3307/012/ NEW SNW PST 24 HRS
TRACE/ 8//// 56024 ASOS 60024 70035 MANUAL 70033 10042 20035

10 A.M.
Weather: Thick fog
Temperature: 38F; Dew Point: 38F; Wind: S at 11 kts
Sea-level pressure: 30.10 ins. Hg, rising, then falling and lower
Visibility: 1/16 of a mile, obscured by thick fog
3-hr precip: 0.01 in.
BHO SA 1455 W2 X 1/16F 194/38/38/1911/010/ 8/// 58007 MANUAL 60001

1 P.M.
Weather: Light rain, fog
Temperature: 47F; Dew Point: 47F; Wind: S at 15G20 kts
Sea-level pressure: 29.99 ins. Hg, falling, then more quickly
Visibility: 3/4 of a mile, except 1/4 mi N-E, visibility
varying 1/2 to 1 mile
6-hr max temp: 47F
6-hr min temp: 34F
6-hr precip: 0.02 in.
BHO SA 1755 W2 X 3/4R-F 156/47/47/1915G20/999/ VSBY N-E 1/4 MI
VSBY 1/2 V 1 MI PRCP VRY LGT/ 8//// 58038 ASOS 60002 MANUAL 60002
10047 20034

SUMMARY FOR TUESDAY, DECEMBER 2, 2014

TEMPERATURE (DEGREES F)
MAX…..37   NORMAL…..44
MIN…..30   NORMAL…..28
MEAN….34   NORMAL…..36

8DEPARTURE FROM 30-YEAR NORMAL…………………….-2
TOTAL DEPARTURE FOR THE MONTH…………………….+11 [+5.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..31  DEPARTURE………..+2
TOTAL HEATING UNITS FOR THE MONTH…………..46  DEPARTURE……….-12
TOTAL HEATING UNITS FOR THE SEASON………..1205  DEPARTURE………-114
TOTAL HEATING UNITS LAST SEASON TO DATE……1280  DIFFERENCE………-75

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………26 E   AT  5:34 P.M.*
ASOS…………………..31 E   AT  5:24 P.M.
DAVIS………………….27 E   AT  5:24 P.M. RMY 31
FASTEST MILE FOR YESTERDAY………………..21 E   AT  5:34 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..21 E   AT  5:34 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….20 E   AT  5:35 P.M.
AVERAGE WIND SPEED AND DIRECTION……………12.0 E
ASOS……………………11.7
DAVIS…………………..10.4 ENE (58 degrees)

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.33  DEPARTURE…..+0.17
ASOS…………..0.35
TOTAL PRECIPITATION FOR THE MONTH……….0.34  DEPARTURE…..+0.02
ASOS…………..0.36
TOTAL PRECIPITATION FOR THE YEAR……….48.11  DEPARTURE…..-0.75
ASOS………….48.55

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……..TRACE  DEPARTURE……-0.3
TOTAL SNOWFALL FOR THE MONTH…………..TRACE  DEPARTURE……-0.5
TOTAL SNOWFALL FOR THE SEASON……………8.7  DEPARTURE……+5.6

PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER & DECEMBER CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/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  45/36/41/-5/0.79/0.0/000/00              35 NNE RMY N/A
11/2  37/32/35/-11/0.29/1.8/000/00             46 NW  RMY 49
11/3  50/30/45/-6/0.00/0.0/584/95              39 WNW RMY 43
11/4  61/44/53/+8/0.00/0.0/208/34              28 SSW RMY 32
11/5  66/50/58/+13/0.00/0.0/006/01             29 SSW RMY N/A
11/6  52/45/49/+4/0.58/0.0/000/00              23 NE  RMY 24
11/7  46/34/40/-5/0.00/0.0/079/13              39 NW  RMY 42
11/8  47/30/39/-5/0.00/0.0/555/92              24 W   RMY 25
11/9  56/38/47/+3/0.00/0.0/204/34              23 SSW RMY N/A
11/10 58/40/49/+5/0.00/0.0/592/99              17 S   RMY 20
11/11 61/43/52/+9/0.00/0.0/358/60              22 S   RMY 25
11/12 59/40/50/+7/0.00/0.0/095/16              22 W   RMY 25
11/13 49/32/41/-2/0.08/T/450/76                21 NW  RMY N/A
11/14 41/27/34/-8/0.29/3.5/442/75              23 NW  RMY 27
11/15 37/24/31/-11/0.00/0.0/569/97             23 NW  RMY 23
11/16 39/26/33/-9/0.00/0.0/012/02              17 S   RMY 19
11/17 52/34/43/+2/1.67/0.0/000/00              29 ENE RMY 31
11/18 44/23/34/-7/0.00/0.0/494/85              33 W   RMY 39
11/19 35/19/27/-14/0.00/0.0/544/94             31 WSW RMY N/A
11/20 47/26/37/-3/0.00/0.0/542/94              35 WSW RMY 41
11/21 34/22/28/-12/0.00/0.0/569/99             31 WNW RMY 39
11/22 43/20/32/-8/0.00/0.0/350/61              32 SW  RMY 36
11/23 58/40/49/+10/0.00/0.0/365/64             26 SW  RMY N/A
11/24 63/43/53/+14/0.60/0.0/000/00             44 S   RMY 53
11/25 61/44/53/+14/0.00/0.0/023/04             28 SW  RMY 30
11/26 44/31/38/+0/1.77/1.0/000/00              41 NE  RMY 46
11/27 36/27/32/-6/0.08/0.9/057/10              29 N   RMY N/A
11/28 32/21/27/-11/0.06/1.5/175/31             29 WNW RMY 32
11/29 32/17/25/-12/0.00/0.0/455/81             17 S   RMY N/A
11/30 55/30/43/+6/0.00/0.0/386/69              32 SSW RMY 38

12/1  63/37/50/+13/0.01/0.0/…/..             28 WNW RMY 31
12/2  37/30/34/-2/…./T/000/00                26 E   RMY 29

12/3 morning low temp: 35F since midnight; the normal low is now 28F

DAILY RECORDS FOR DECEMBER 2014:
None so far.

DAILY RECORDS FOR NOVEMBER 2014:
11/2  – A NEW RECORD DAILY SNOWFALL: 1.8 INCHES;
surpasses the previous record of 0.2 ins. in 1906, 1951
11/14 – DAILY SNOWFALL RECORD EQUALED: 3.5 INCHES;
ties previous record on this date in 1997

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

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

RECORDS FOR DECEMBER 4
HIGH 67 IN 1998
LOW -4 IN 1940
PRECIP 1.87 INS. IN 1968
SNOWFALL 6.0 INS. IN 1907
PEAK GUST 73 MPH WNW IN 1980

TODAY’S REPORT PREPARED BY: Brian Fitzgerald