Sunday, May 20, 2018
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, MAY 20, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME
WARM AND MOIST CONDITIONS UNDER CLOUDY SKIES
A thick fog kept visibility at 3 miles for this mornings
observations, but visibility improved before 10 AM with
visibilities reaching up to 40 miles.
Winds increased overnight and continue to be gusty as
temperatures warmed into the mid 70s by mid day with dew
points sitting in the mid 60s
Cloud skies prevailed throughout the day with only a few breaks
of sun.
Today’s Observations:
7 A.M.
Weather: Fog
Temperature: 63F; Dew Point: 63F; Wind:SSW at 17G24 kts
Sea-level pressure: 29.90 ins. Hg, falling, then more slowly
Visibility: 3 miles,
6-hr Max temp: 63F
6-hr Min temp: 56F
24-HR Precip: 0.21
BHO SA 1155 W2 X 3F 126/63/63/2117G24/990/ PK WND 2127/33 8////
MANUAL 70021 ASOS 70021 56009 10063 20056
10 A.M.
Weather: Overcast Stratocumulus
Temperature: 70F; Dew Point: 65F; Wind: WSW at 16G28 kts
Sea-level pressure: 29.92 ins. Hg, falling, then more slowly
Visibility: 30 miles, except 20 miles SE-SSW, 40 E, distant haze in all
directions
3-hr Precip: 0.00 in
BHO SA 1455 E15 OVC 30 113/70/65/2413G28/992/ LGT DSNT HZ
VSBY 20 SE-SSW 40 E 8/5// 56013
1 P.M.
Weather: Broken Stratocumulus, overcast altocumulus
Temperature: 75F; Dew Point: 64F; Wind: WSW at 13G19 kts
Sea-level pressure: 29.84 ins. Hg, falling then more rapidly
Visibility: 40 miles, Light distant haze
6-hr Max temp: 75F
6-hr Min temp: 63F
6-hr precip: 0.01 ins.
BHO SA 1755 E32 BKN 90 OVC 40 106/75/64/2513G19/984
LGT DSNT HZ/ 8/53/ 58007 10075 20063
SUMMARY FOR SATURDAY, MAY 19, 2018
TEMPERATURE (DEGREES F)
MAX…..57 NORMAL…..67
MIN…..43 NORMAL…..48
MEAN….50 NORMAL…..58
DEPARTURE FROM 30-YEAR NORMAL……………………..-8
TOTAL DEPARTURE FOR THE MONTH……………………+94 [+5.3 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….15 DEPARTURE……….+7
TOTAL HEATING UNITS FOR THE MONTH…………124 DEPARTURE………-69
TOTAL HEATING UNITS FOR THE SEASON……….5817 DEPARTURE……..-411
TOTAL HEATING UNITS LAST SEASON TO DATE…..5553 DIFFERENCE…….+266
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0 DEPARTURE……….-1
TOTAL COOLING UNITS FOR THE MONTH…………..36 DEPARTURE………+28
TOTAL COOLING UNITS FOR THE SEASON………….36 DEPARTURE………+26
TOTAL COOLING UNITS LAST SEASON TO DATE……..56 DEPARTURE………-20
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….22 E AT 8:57 A.M.
AERO……………………17 E AT 8:57 A.M.
ASOS……………………21 E AT 8:57 A.M.
DAVIS…………………..19 M AT 8:44 A.M.** RMY N/A
FASTEST MILE FOR YESTERDAY…………………15 E AT 8:57 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………15 E AT 8:57 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..15 M AT 8:57 A.M.**
AVERAGE WIND SPEED AND DIRECTION…………..8.8 E
ASOS…………………..9.0
DAVIS………………….8.7 M**
** Davis direction malfunctioning
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.21 DEPARTURE……+0.07
ASOS…………..0.24
TOTAL PRECIPITATION FOR THE MONTH……….1.58 DEPARTURE……-0.77
ASOS…………..1.56
TOTAL PRECIPITATION FOR THE YEAR……….26.89 DEPARTURE……+6.17
ASOS………….28.48
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…………..92.8 DEPARTURE…….+30.0
PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system 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
M: Missing data
5/01 65/39/52/-1/0.00/0.0/625/74 25 WNW AERO 21 WNW RMY 25
5/02 88/59/74/+21/0.00/0.0/584/69 37 WSW AERO 29 WSW RMY 35
5/03 90/67/70/+26/…./0.0/433/51 36 SW AERO 32 WSW RMY 36
5/04 84/67/74/+20/…./0.0/102/12 39 SSW AERO 37 SSW RMY N/A
5/05 73/54/64/+10/0.00/0.0/615/72 56 W AERO 55 W RMY N/A
5/06 65/48/57/+3/0.21/0.0/000/00 24 NE AERO 18 NE RMY 21
5/07 62/49/56/+1/0.00/0.0/713/83 26 ENE AERO 22 NE RMY 24
5/08 73/46/60/+5/0.00/0.0/852/99 25 SSE AERO 21 ESE RMY 23
5/09 74/48/61/+6/…./0.0/768/89 23 ESE AERO 18 ESE RMY 21
5/10 73/48/61/+6/…./0.0/…/.. 33 S AERO 30 S RMY 32
5/11 70/51/61/+5/…./0.0/…/.. 26 WNW AERO 24 NW RMY 28
5/12 51/47/49/-7/0.19/0.0/…/.. 25 E AERO 23 E RMY N/A
5/13 58/46/52/-4/T/0.0/…/.. 20 S AERO 17 S RMY 16
5/14 73/47/60/+3/0.00/0.0/…/.. 23 S AERO 18 S RMY 21
5/15 83/54/69/+12/…./0.0/…/.. 51 NW AERO 50 NW RMY 54 TSTM
5/16 56/49/53/-4/T/0.0/…/.. 32 ENE AERO 28 ENE RMY 30
5/17 72/51/62/+5/0.02/0.0/…/.. 17 SW AERO 14 SW RMY N/A
5/18 62/43/53/-5/0.00/0.0/…/.. 35 ENE AERO 33 ENE RMY N/A
5/19 57/43/50/-8/…/0.0/…/.. 22 E AERO 15 E RMY N/A
5/20 Low temp since midnight is 56F; normal low is now 49F
DAILY RECORDS FOR MAY 2018
5/03/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 67F,
BREAKS PREVIOUS RECORD OF 66F SET IN 2001
5/04/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 67F,
BREAKS PREVIOUS RECORD OF 66F SET IN 2001
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR MAY 20
HIGH 91F IN 1975,1996
LOW 37F IN 1948, 2002
PRECIP 1.65 INCHES IN 1969
PEAK GUST 57 MPH S IN 1963, WNW IN 1982
RECORDS FOR MAY 21
HIGH 92F IN 1921
LOW 35F IN 1907
PRECIP 1.61 INS IN 1954
PEAK GUST 74 MPH WSW IN 2006
TODAY’S REPORT PREPARED BY: Robert Millette
