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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MAY 30, 2018  
ALL TIMES ARE IN EASTERN STANDARD TIME


A SLIGHTLY ABOVE SEASONABLE HAZY DAY ON THE THE GREAT
BLUE HILL...
This morning started partly cloudy with scattered stratocumulus
and cirrus. As the day progressed to the 10 A.M, Observation
the sky became more cloudy, almost reaching a mostly cloudy
condition. The humidity consistently dropped from 80%
to 54% throughout the day making it a warm and comfortable
afternoon. Although with the lingering haze, it kept
visibility low, around 40 miles.  


Today's Observations:


7 A.M.
Weather: Scattered stratocumulus, scattered cirrus
Temperature: 64F; Dew Point: 58F; Wind: ENE at 7 kts
Sea-level pressure: 30.19 ins. Hg, rising, then more rapidly
Visibility: 40 miles, distant haze in all directions
6-hr Max temp: 65F
6-hr Min temp: 60F
24-hr Precip: 0.00 ins.
BHO SA 1155 35 SCT 300 SCT 40 222/64/58/0707/019/ DSNT HZ ALQDS/
8/801 51022 10065 20060

10 A.M.
Weather: Scattered stratocumulus, scattered cirrostratus,
few distant cumulus along the horizon SSE-SSW
Temperature: 67F; Dew Point: 51F; Wind: NE at 7 kts
Sea-level pressure: 30.20 ins. Hg, rising, then more rapidly
Visibility: 40 miles, distant haze in all directions
3-hr Precip: 0.00 ins.
BHO SA 1455 E55 BKN 250 BKN 40 228/67/51/0507/020/ FEW DST
CU ALNG HRZN SSE-SSW DST HZ ALQDS/ 8/805 53006

1 P.M.
Weather: Scattered cumulus, scattered cirrus,
few stratocumulus SSE-SSW
Temperature: 68F; Dew Point: 54F; Wind: NE at 10G14 kts
Sea-level pressure: 30.19 ins. Hg, rising, then more slowly
Visibility: 40 miles, distant haze in all directions
6-hr Max temp: 70F
6-hr Min temp: 64F
6-hr precip:  0.00 ins.
BHO SA 1755 55 SCT 250 SCT 40 223/68/54/0410G14/019/
FEW SC SSE-SSW DSNT HZ ALQDS/ 8/801 58005 10070 20064


SUMMARY FOR TUESDAY, MAY 29, 2018

TEMPERATURE (DEGREES F)
MAX.....85   NORMAL.....70
MIN.....56   NORMAL.....52
MEAN....71   NORMAL.....61

DEPARTURE FROM 30-YEAR NORMAL........................+10
TOTAL DEPARTURE FOR THE MONTH.......................+141 [+4.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............0  DEPARTURE...........-6
TOTAL HEATING UNITS FOR THE MONTH............154  DEPARTURE.........-104
TOTAL HEATING UNITS FOR THE SEASON..........5847  DEPARTURE.........-445
TOTAL HEATING UNITS LAST SEASON TO DATE.....5647  DIFFERENCE........+200

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............6  DEPARTURE..........+5
TOTAL COOLING UNITS FOR THE MONTH..............58  DEPARTURE.........+39
TOTAL COOLING UNITS FOR THE SEASON.............58  DEPARTURE.........+37
TOTAL COOLING UNITS LAST SEASON TO DATE........56  DEPARTURE..........+2

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY....................23 WSW AT 2:56 A.M.
                   AERO.........................23 WSW AT 2:56 A.M.
                   ASOS.........................24 SW  AT 2:56 A.M.
                   DAVIS........................24 M   AT 1:12 A.M.**RMY N/A
FASTEST MILE FOR YESTERDAY......................17 WSW AT 2:44 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................17 SW  AT 2:44 A.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE..................17 M   AT 1:04 A.M.**
AVERAGE WIND SPEED AND DIRECTION...............9.0 SW
                   ASOS........................9.0
                   DAVIS.......................9.1 M
** Davis direction malfunctioning

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.14
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........2.00  DEPARTURE......-1.80
                         ASOS..............1.95  
TOTAL PRECIPITATION FOR THE YEAR..........27.31  DEPARTURE......+5.14
                         ASOS.............28.87

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/+26/0.13/0.0/433/51   36 SW  AERO 32 WSW RMY 36  
5/04 84/67/74/+20/0.05/0.0/102/12   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/+6/0.00/0.0/768/89    23 ESE AERO 18 ESE RMY 21
5/10 73/48/61/+6/0.03/0.0/355/41    33 S   AERO 30 S   RMY 32
5/11 70/51/61/+5/0.00/0.0/703/81    26 WNW AERO 24 NW  RMY 28
5/12 51/47/49/-7/0.19/0.0/000/00    25 E   AERO 23 E   RMY N/A
5/13 58/46/52/-4/T/0.0/392/45       20 S   AERO 17 S   RMY 16
5/14 73/47/60/+3/T/0.0/557/63       23 S   AERO 18 S   RMY 21
5/15 83/54/69/+12/0.74/0.0/333/38   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 75/52/64/+5/0.00/0.0/.../..    22 W   AERO 18 W   RMY 20
5/22 68/51/60/+1/0.04/0.0/.../..    23 SSW AERO 21 S   RMY 22
5/23 82/51/67/+8/0.06/0.0/.../..    33 NNW AERO 33 NNW RMY 34 TSTM
5/24 74/50/62/+3/0.00/0.0/.../..    28 SSW AERO 25 SSW RMY 27
5/25 86/50/68/+8/0.00/0.0/.../..    40 W   AERO 39 W   RMY 43
5/26 88/61/75/+15/..../0.0/.../..   38 ENE AERO 38 ENE RMY 39
5/27 61/47/54/-6/..../0.0/.../..    32 ENE AERO 30 ENE RMY N/A
5/28 60/48/54/-7/..../0.0/.../..    23 S   AERO 21 S   RMY N/A
5/29 85/56/71/10/0.00/0.0/.../..    23 WSW AERO 23 WSW RMY N/A


5/30 Low temp since midnight is 60F; normal low is now 52F


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 30
HIGH 93F IN 1929
LOW 39F IN 1949,1961
PRECIP 1.47 INS 1948
PEAK GUST 61e MPH NW IN 1945

RECORDS FOR MAY 31
HIGH 92F IN 1944,1987,2013
LOW 35F IN 1961
PRECIP 5.02 INS 1984 (RECORD FOR MAY)
PEAK GUST 54e MPH WNW IN 1945

TODAY'S REPORT PREPARED BY: Kaitlin Geagan/ Devin Richardt