Tuesday, May 22, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, MAY 22, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

A CLOUDY DAY WITH BELOW SEASONABLE TEMPERATURES AND
INCREASING HUMIDITY ON GREAT BLUE HILL….

Yesterday was above seasonable with a maximum temperature
of 77F, 9 degrees above the daily normal of 68F. Today we
observed a maximum of 68F, which is the same as the daily
normal. Today we observed overcast skies and a visibility of
thirty miles on average. Wind has been light for most of the
day, remaining under 10 mph. There were some light rain showers
shortly after noontime, leaving only a trace so far today.

Today’s Observations:

7 A.M.
Weather: Overcast cirrostratus, thin smoke layer all quadrants
Temperature: 68F; Dew Point: 47F; Wind: ESE at 8G12 kts
Sea-level pressure: 30.16 ins. Hg, falling then rising
Visibility: 50 miles
6-hr Max temp: 67F
6-hr Min temp: 56F
24-HR Precip: 0.00
BHO SA 1155 E200 OVC 50 215/68/47/1008G12/016/ THN K LYR ALQDS/
8/02/ 50002 10067 20056

10 A.M.
Weather: Overcast altostratus, few stratus fractus overhead
Temperature: 65F; Dew Point: 51F; Wind: ESE at 7 kts
Sea-level pressure: 30.16 ins. Hg, steady
Visibility: 30 miles, distant fog WSW-NE
3-hr Precip: 0.00 in
BHO SA 1455 E100 OVC 30 215/65/51/1207/016/ DSNT FG WSW-NE FEW
STFA OVHD/ 8/72/ 50000

1 P.M.
Weather: Overcast altostratus
Temperature: 60F; Dew Point: N/A; Wind: W at 5 kts,
Wind: Light
Sea-level pressure: 30.15 ins. Hg, rising then falling
Visibility: 20 miles, distant fog in all directions
6-hr Max temp: 68F
6-hr Min temp: 60F
6-hr precip: Trace
BHO SA 1755 E110 OVC 20 211/60/M/1605/015/ DSNT FG ALQDS WND LGT
/ 8/02/ 50004 MANUAL 6000/ ASOS 60001 10068 20060

SUMMARY FOR MONDAY, MAY 21, 2018

TEMPERATURE (DEGREES F)
MAX…..77   NORMAL…..68
MIN…..52   NORMAL…..49
MEAN….65   NORMAL…..59

DEPARTURE FROM 30-YEAR NORMAL…………………….+6
TOTAL DEPARTURE FOR THE MONTH…………………..+108 [+4.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..0   DEPARTURE……….-7
TOTAL HEATING UNITS FOR THE MONTH…………124   DEPARTURE………-84
TOTAL HEATING UNITS FOR THE SEASON……….5817   DEPARTURE……..-425
TOTAL HEATING UNITS LAST SEASON TO DATE…..5569   DIFFERENCE…….+248

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………..0
TOTAL COOLING UNITS FOR THE MONTH…………..37   DEPARTURE………+27
TOTAL COOLING UNITS FOR THE SEASON………….37   DEPARTURE………+25
TOTAL COOLING UNITS LAST SEASON TO DATE……..56   DEPARTURE………-19

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….22 W  AT 2:38 P.M.
AERO……………………18 W  AT 2:35 P.M.
ASOS……………………21 W  AT 2:38 P.M.
DAVIS…………………..20 M  AT 4:02 P.M.** RMY N/A
FASTEST MILE FOR YESTERDAY…………………15 W  AT 3:48 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………16 W  AT 2:35 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..15 M  AT 4:02 P.M.**
AVERAGE WIND SPEED AND DIRECTION…………..8.8 NNW
ASOS…………………..8.6
DAVIS………………….8.7 M**
** Davis direction malfunctioning

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.78  DEPARTURE……-0.83
ASOS…………..1.77
TOTAL PRECIPITATION FOR THE YEAR……….27.09  DEPARTURE……+6.11
ASOS………….28.69

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 90/67/79/+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 17 E   RMY N/A
5/20 77/54/66/+8/…/0.0/…/..     33 SW  AERO 31 SW  RMY 33 TSTM
5/21 77/52/65/+6/0.00/0.0/…/..    22 W   AERO 18 W   RMY 20

5/22 Low temp since midnight is 56F; normal low is now 50F

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 22
HIGH 93F IN 1911
LOW 35F IN 1907
PRECIP 3.75 INCHES IN 1920
PEAK GUST 49e MPH SSW IN 1947

RECORDS FOR MAY 23
HIGH 92F IN 1964,1992
LOW 38F IN 1976
PRECIP 0.97 INS IN 1979
PEAK GUST 49e MPH W IN 1945

TODAY’S REPORT PREPARED BY: Benjamin Turner