BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, MAY 12, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME
FOLLOWING TEMPERATURE FREE FALL MONDAY, TEMPS
REBOUND BY MID DAY, MONTHLY TEMPS 7.8 DEGREES ABOVE NORMAL
Yesterday’s maximum temperature of 84F quickly fell into
the 50s by mid day, and eventual bottomed out at 47F
early this morning. Quick showers and drizzle brought at
least one brief downpour, totaling 0.14 inches of new rain,
bringing May’s monthly total to now just 0.17 inches. Red
flag warning and fire weather advisories are in place today
with dry conditions this week.
By the 1:00 PM EST observation temperatures have climbed
to 83F with hazy conditions limiting visibility to 20 miles
in all directions. Moderate to towering cumulus were visible
at this time, with further development continuing after the
observation.
Today’s Observations:
7 A.M.
Weather: Fog, light drizzle, bright spots overhead
Temperature: 50F; Dew Point: 50F; Wind: estimated N at 5 kts
Wind Speed: Light
Sea-level pressure: 29.88 ins. Hg, falling, then more slowly
Visibility: 1/4 of a mile, thick fog
6-hr Max temp: 50F
6-hr Min temp: 47F
24-hr precip: 0.14 inches
BHO SA 1155 W3 X 1/4L-F 120/50/50/E3605/988/ BRGHT SPTS OVHD
PRCP VRY LGT WND LGT/ 8//// 56016 ASOS 60014 70014 MANUAL 70014
10050 20047
10 A.M.
Weather: Thin fog, bright spots overhead
Temperature: 62F; Dew Point: 60F; Wind: estimated SW at 5 kts,
Wind Speed: Light
Sea-level pressure: 29.81 ins. Hg, falling, then more slowly
Visibility: 3/4 of a mile, fog
3-hr precip: Trace
BHO SA 1455 E3 -OVC 3/4F 095/62/60/E2205/981/ BRGHT SPTS OVHD
WND LGT/ 8//// 56025 MANUAL 6000/
1 P.M.
Weather: Scattered cumulus, broken altostratus, broken
altocumulus, few moderate cumulus in all directions
Temperature: 83F; Dew Point: 65F; Wind: S at 7G15 kts,
Sea-level pressure: 29.74 ins. Hg, falling, then more quickly
Visibility: 20 miles, thin fog and hazy
6-Hr Max temp: 83F
6-Hr Min temp: 50F
6-hr precip: Trace
BHO SA 1755 40 SCT E160 BKN 200 BKN 20 072/83/65/1907G15/974/
FEW MDT CU ALQDS THN FG ALQDS HAZY/ 8/270 58023 MANUAL 6000/
10083 20050
SUMMARY FOR MONDAY, MAY 11, 2015
TEMPERATURE (DEGREES F)
MAX…..84 NORMAL…..65
MIN…..48 NORMAL…..46
MEAN….66 NORMAL…..56
DEPARTURE FROM 30-YEAR NORMAL………………….+10
TOTAL DEPARTURE FOR THE MONTH………………….+80 [+7.8 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0 DEPARTURE……….-10
TOTAL HEATING UNITS FOR THE MONTH…………..53 DEPARTURE……….-70
TOTAL HEATING UNITS FOR THE SEASON………..6324 DEPARTURE………+166
TOTAL HEATING UNITS LAST SEASON TO DATE……6255 DIFFERENCE………+69
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..1 DEPARTURE……….+1
TOTAL COOLING UNITS FOR THE MONTH………….15 DEPARTURE………+12
TOTAL COOLING UNITS FOR THE SEASON…………15 DEPARTURE………+10
TOTAL COOLING UNITS LAST SEASON TO DATE……..7 DIFFERENCE………+9
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………30 NE AT 12:21 P.M.*
ASOS…………………..31 NE AT 12:19 P.M.
DAVIS………………….29 NE AT 12:18 P.M. RMY 31
FASTEST MILE FOR YESTERDAY………………..23 NE AT 12:19 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..24 NE AT 12:20 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….23 NE AT 12:19 P.M.
AVERAGE WIND SPEED AND DIRECTION………….11.5 NE
ASOS………………….11.6
DAVIS…………………10.7 ENE [062 degrees]
* Last of several occurrences…
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.14 DEPARTURE…..+0.02
ASOS……………0.14
TOTAL PRECIPITATION FOR THE MONTH………..0.17 DEPARTURE…..-1.17
ASOS……………0.17
TOTAL PRECIPITATION FOR THE YEAR………..18.12 DEPARTURE…..-1.67
ASOS…………….N/A ***
*** ASOS annual totals not available due to erroneous readings
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………..0.0 DEPARTURE……0.0
TOTAL SNOWFALL FOR THE MONTH……………..0.0 DEPARTURE……0.0
TOTAL SNOWFALL FOR THE SEASON…………..150.8 DEPARTURE….+88.1
PRELIMINARY CLIMATE SUMMARY FOR MAY 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
5/1 52/37/45/-8/0.00/0.0/…/.. 21 NE RMY 20
5/2 63/35/49/-4/0.00/0.0/…/.. 20 S RMY 20
5/3 74/44/59/+6/0.00/0.0/…/.. 22 S RMY 22
5/4 83/47/65/+11/0.00/0.0/…/.. 39 SSW RMY 45
5/5 77/56/67/+13/0.03/0.0/…/.. 29 SW RMY N/A
5/6 74/54/64/+10/0.00/0.0/…/.. 24 SSW RMY 25
5/7 84/52/68/+13/0.00/0.0/…/.. 29 S RMY 32
5/8 74/44/59/+4/0.00/0.0/…/.. 27 NNE RMY 26
5/9 77/44/61/+6/0.00/0.0/…/.. 30 S RMY 32
5/10 88/60/74/+19/0.00/0.0/…/.. 28 SSW RMY 30
5/11 84/48/66/+10/0.00/0.0/…/.. 30 NE RMY 31
5/12 low since midnight is 47F; normal low now 47F
DAILY RECORDS FOR MAY 2015
NONE SO FAR
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR MAY 12
HIGH 88F IN 2001
LOW 29F IN 1907
PRECIP 1.49 INCHES IN 1968
PEAK GUST 76 MPH S IN 1974
RECORDS FOR MAY 13
HIGH 85F IN 1947
LOW 35F IN 1914, 2005
PRECIP 2.39 INCHES IN 2006
PEAK GUST 49 MPH NNW IN 1965
TODAY’S REPORT PREPARED BY: Brian Fitzgerald
Monthly Skymail, event announcements, and research summaries.
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