Tuesday, December 22, 2015
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, DECEMBER 22, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME
TEMPS STUCK NEAR 50F OVERNIGHT, RAIN MOVES IN
AND ABOVE NORMAL WARMTH CONTINUES
Warm air has arrived once again from the SW, with temperatures
only dipping to 48F overnight. Yesterday’s average temperature
of 41F created another departure in the double digits above
normal at +11.
Rain began this morning in rounds by the 7:00 AM EST observation,
totaling 0.17 inches by the 1:00 PM EST observation. Fog became
thick as well, reducing visibility to 3/4 of a mile with 300 feet
of vertical visibility. Temperatures had reached a maximum reading
of 55F by that time as well.
So far this season, there has been no measurable snow on Blue Hill.
This season is now tied for the fourth latest on record for the first
occurrence of measurable snowfall with no snow likely over the next week.
BHO Latest First Measurable Snowfall, (1885-2014)
1) January 13, 2000 (7.0 inches)
2) January 1, 1954 (0.8 inches)
3) December 29, 1941 (0.4 inches)
4) December 22, 1998 (0.6 inches)
5) December 16, 1973 (0.4 inches)
6) December 15, 1891 (0.3 inches)
Today’s Observations:
7 A.M.
Weather: Light rain beginning at 6:55 AM EST, overcast
nimbostratus
Temperature: 50F; Dew Point: 45F; Wind: S at 8 kts
Sea-level pressure: 30.09 ins. Hg, rising, then more slowly
Visibility: 20 miles, except 5 miles SW-WSW thin fog, light rain
6-hr Max temp: 51F
6-hr Min temp: 50F
24-hr precip: Trace
BHO SA 1155 E70 OVC 20R- 188/50/45/1708/009/ R-B52 VSBY SE-WSW 5 MI
THN FG ALQDS/ 8/02/ 51003 MANUAL 6000/ 10051 20050
10 A.M.
Weather: Rain ends 9:23 AM EST, broken stratocumulus,
overcast altostratus, patches of fog drifting below
the summit in all directions
Temperature: 50F; Dew Point: 49F; Wind: S at 7 kts
Sea-level pressure: 30.09 ins. Hg, about the same
Visibility: 10 miles, thin fog, patches of fog
3-hr precip: 0.04 ins.
BHO SA 1455 E40 BKN E100 OVC 10 188/50/49/1707/009/ R-E23 PTCHS
FG DRFTG BLO SMT ALQDS THN FG ALQDS/ 8/52/ 58000 ASOS 60004
MANUAL 60004
1 P.M.
Weather: Moderate rain, fog
Temperature: 54F; Dew Point: 54F; Wind: S at 18G24 kts
Sea-level pressure: 29.95 ins. Hg, falling rapidly
Visibility: 3/4 of a mile, moderate rain and fog
6-hr Max Temp: 55F
6-hr Min Temp: 49F
6-hr precip: 0.17 ins.
BHO SA 1755 W3 X 3/4R-F 143/54/54/1818G24/995/ PRESFR/
8//// 56045 ASOS 60018 MANUAL 60017 10055 20049
SUMMARY FOR MONDAY, DECEMBER 21, 2015
TEMPERATURE (DEGREES F)
MAX…..51 NORMAL…..37
MIN…..31 NORMAL…..22
MEAN….41 NORMAL…..30
DEPARTURE FROM 30-YEAR NORMAL…………………+11
TOTAL DEPARTURE FOR THE MONTH………………..+227 [+10.6 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..24 DEPARTURE………-11
TOTAL HEATING UNITS FOR THE MONTH………….444 DEPARTURE……..-230
TOTAL HEATING UNITS FOR THE SEASON………..1446 DEPARTURE……..-489
TOTAL HEATING UNITS LAST SEASON TO DATE……1793 DIFFERENCE…….-347
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….38 SSW AT 3:03 P.M.*
ASOS……………………40 SSW AT 10:28 A.M.
DAVIS…………………..40 SW AT 10:27 A.M. RMY 42
FASTEST MILE FOR YESTERDAY…………………31 SSW AT 12:44 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………30 SSW AT 12:44 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..29 SW AT 12:44 P.M.
AVERAGE WIND SPEED AND DIRECTION………….20.3 SW
ASOS………………….19.9
DAVIS…………………18.7 SW [223 Deg.]
* Last of several occurrences…
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….TRACE DEPARTURE……-0.15
ASOS……………0.00
TOTAL PRECIPITATION FOR THE MONTH………..1.60 DEPARTURE……-1.79
ASOS……………1.61
TOTAL PRECIPITATION FOR THE YEAR………..41.02 DEPARTURE…..-10.91
ASOS…………….N/A ***
*** ASOS annual total not available due to erroneous readings
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0 DEPARTURE……-0.4
TOTAL SNOWFALL FOR THE MONTH…………….0.0 DEPARTURE……-8.2
TOTAL SNOWFALL FOR THE SEASON………….TRACE DEPARTURE…..-10.8
PRELIMINARY CLIMATE SUMMARY FOR 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
12/1 42/30/36/-1/…./0.0/000/00 19 NNE RMY 19
12/2 53/37/45/+9/…./0.0/000/00 25 SSE RMY 25
12/3 53/37/45/+9/…./0.0/162/29 43 WNW RMY 42
12/4 47/32/40/+5/0.00/0.0/444/80 32 NW RMY 32
12/5 50/33/42/+7/0.00/0.0/548/99 21 W RMY N/A
12/6 57/35/46/+11/0.00/0.0/531/96 22 SW RMY N/A
12/7 54/37/46/+12/0.00/0.0/353/64 31 NE RMY N/A
12/8 42/35/39/+5/0.01/0.0/000/00 32 NE RMY 31
12/9 44/34/39/+5/…./0.0/044/08 28 SSE RMY N/A
12/10 57/41/49/+16/T/0.0/209/38 29 SE RMY N/A
12/11 56/44/50/+17/0.00/0.0/049/09 28 SSW RMY 28
12/12 59/46/53/+20/0.00/0.0/367/67 23 W RMY N/A
12/13 54/44/49/+17/0.00/0.0/000/00 18 ESE RMY 19
12/14 60/43/52/+20/…./0.0/000/00 32 S RMY N/A
12/15 61/45/53/+21/…./0.0/371/68 48 W RMY 51
12/16 45/34/40/+9/0.00/0.0/415/76 25 N RMY N/A
12/17 53/36/45/+14/…./0.0/000/00 29 SE RMY 28
12/18 50/35/43/+12/…./0.0/000/00 29 NW RMY 30
12/19 38/30/34/+4/0.00/0.0/…/.. 39 W RMY 40
12/20 40/28/34/+4/0.00/0.0/…/.. 24 W RMY N/A
12/21 51/31/41/+11/T/0.0/…/.. 38 SSW RMY 42
12/22 low since midnight is 50F; normal low is now 22F
DAILY RECORDS FOR DECEMBER 2015
**12/13/2015- NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 44F,
BREAKS PREVIOUS RECORD OF 43F SET IN 1919, TIED 1983**
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR DECEMBER 22
HIGH 62 IN 1994
LOW -5 IN 1921
PRECIP 1.52 INS. IN 1975
SNOWFALL 8.8 INS. IN 1975
PEAK GUST 62 MPH WNW IN 1998
RECORDS FOR DECEMBER 23
HIGH 62 IN 1990
LOW -1 IN 1989
PRECIP 1.70 INS. IN 1947
SNOWFALL 11.9 INS. IN 1947
PEAK GUST 67 SSE IN 2004
TODAY’S REPORT PREPARED BY: Brian Fitzgerald
