Saturday, December 6, 2014
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, DECEMBER 6, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME
TEMPERATURE RISES OVERNIGHT AS RAIN MOVES IN…
Rain began late last evening with the temperature in
the middle 30s and an onshore wind. Rain became less
frequent after sunrise when the wind became a land
breeze, which caused the temperature to drop from
its high of the day of 43F near 6:30 AM EST back
down to 36F by mid-morning. The rain overnight totaled
0.37 inch, and periods of light rain during this
morning brought another 0.10 inch for the six hours
ending at 1 PM EST. The wind speed has been light
all morning and remains from the WSW-W this
afternoon. The summit has been shrouded in dense
fog all day with the visibility rising no higher
than 1/8 mile during the steadier rain.
Today’s Observations:
7 A.M.
Weather: Sky obscured in dense fog
Temperature: 40F; Dew Point: 40F; Wind: WSW at 8 kts
Sea-level pressure: 30.24 ins. Hg, falling then more slowly
Visibility: 1/16 miles
6-hr max temp: 43F
6-hr min temp: 36F
24-hr precip: 0.37 inch
BHO SA 1155 W1 X 1/16F 242/40/40/2408/024/ 8//// 56023 60///
70037 10043 20036
10 A.M.
Weather: Sky obscured in light rain and dense fog
Temperature: 36F; Dew Point: 36F; Wind: WSW at 7 kts
Sea-level pressure: 30.24 ins. Hg, falling slightly
Visibility: 1/16 mile
3-hour precip: Trace
BHO SA 1455 W2 X 1/16R-F 241/36/36/2407/024/ 8//// 58001 6000/
1 P.M.
Weather: Sky obscured in dense fog
Temperature: 37F; Dew Point: 37F; Wind: WSW at 8 kts
Sea-level pressure: 30.22 ins. Hg, falling
Visibility: 1/8 miles
6-hr max temp: 41F
6-hr min temp: 36F
6-hour precip: 0.10 inch
BHO SA 1755 W2 X 1/8F 232/37/37/2408/022/ 8//// 58018 6010/
10041 20036
SUMMARY FOR FRIDAY, DECEMBER 5, 2014
TEMPERATURE (DEGREES F)
MAX…..42 NORMAL…..43
MIN…..23 NORMAL…..27
MEAN….33 NORMAL…..35
DEPARTURE FROM 30-YEAR NORMAL…………………….-2
TOTAL DEPARTURE FOR THE MONTH……………………+14 [+2.6 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..32 DEPARTURE………..+2
TOTAL HEATING UNITS FOR THE MONTH………….132 DEPARTURE……….-14
TOTAL HEATING UNITS FOR THE SEASON………..1291 DEPARTURE………-117
TOTAL HEATING UNITS LAST SEASON TO DATE……1354 DIFFERENCE………-63
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………21 E AT 9:15 P.M. *
ASOS…………………..23 ESE AT 9:16 P.M.
DAVIS………………….12 ESE AT 9:09 P.M. RMY 22
FASTEST MILE FOR YESTERDAY………………..17 ESE AT 9:20 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..17 ESE AT 9:24 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….17 E AT 9:23 P.M.
AVERAGE WIND SPEED AND DIRECTION………….9.3 ESE
ASOS………………….9.5
DAVIS…………………7.6 ENE (67 degrees)
* Last of several occurrences…
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.37 DEPARTURE…..+0.20
ASOS…………..0.37
TOTAL PRECIPITATION FOR THE MONTH……….0.79 DEPARTURE…..-0.03
ASOS…………..0.83
TOTAL PRECIPITATION FOR THE YEAR……….48.55 DEPARTURE…..-0.80
ASOS………….49.02
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0 DEPARTURE……-0.3
TOTAL SNOWFALL FOR THE MONTH…………..TRACE DEPARTURE……-1.4
TOTAL SNOWFALL FOR THE SEASON……………8.7 DEPARTURE……+4.7
PRELIMINARY CLIMATE SUMMARY FOR 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
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 49/34/42/+6/…./0.0/000/00 40 W RMY 43
12/4 41/27/34/-1/…./0.0/…/.. 29 WNW RMY N/A
12/5 42/23/33/-2/…./0.0/…/.. 21 E RMY 22
12/6 morning low temp: 36F since midnight; the normal low is now 27F
DAILY RECORDS FOR DECEMBER 2014:
None so far.
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR DECEMBER 6
HIGH 70 IN 2001
LOW 5 IN 1901,1935
PRECIP 2.78 INS. IN 2003
SNOWFALL 17.0 INS. IN 2003
PEAK GUST 74 MPH NW IN 1981
RECORDS FOR DECEMBER 7
HIGH 74 IN 1998
LOW 6 IN 1906
PRECIP 1.67 INS. IN 1953
SNOWFALL 6.3 INS. IN 2003
PEAK GUST 76e SE IN 1976
TODAY’S REPORT PREPARED BY: Mike Iacono
