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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, MAY 29, 2018  
ALL TIMES ARE IN EASTERN STANDARD TIME

A HAZY, ABOVE SEASONABLE DAY FOLLOWING THE COOL AND 
CLOUDY LAST FEW DAYS....

We observed a maximum temperature so far today of 84F.  This is 
14 degrees above the normal of 70F. Winds have stayed light and 
northerly for most of the day today. The highest visibility 
observed since this morning was 40 miles, due to a distant haze.
Humidity has decreased considerably since 7 A.M., falling 
from 90% to 50% by the 1 P.M. observation.

Blue Hill Observatory Warmest May Mean Temperature (°F), 1885-2017

1. 61.5 in 2015
2. 61.4 in 1991 
3. 61.0 in 1944
4. 60.9 in 2010
5. 59.4 in 1911
   59.4 in 1959
7. 59.3 in 1964
   59.3 in 2012

Today's Observations:

7 A.M.
Weather: Few cumulus in all directions 
Temperature: 65F; Dew Point: 62F; Wind: NE at 9G13 kts
Sea-level pressure: 29.96 ins. Hg, rising, then more rapidly
Visibility: 20 miles, distant fog in all directions
6-hr Max temp: 65F
6-hr Min temp: 57F
24-hr Precip: 0.00 ins.
BHO SA 1155 250 SCT 20 146/65/62/2709G13/996/ FEW CU ALQDS 
DSNT FG ALQDS/ 8/105 53005 10065 20057  

10 A.M.
Weather: Few cumulus SE-NE, few cirrostratus SW-SE 
Temperature: 79F; Dew Point: 60F; Wind: NNW at 6G15 kts,
Wind: Light
Sea-level pressure: 29.98 ins. Hg, rising, then more slowly
Visibility: 30 miles, haze in all directions 
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 30 151/79/60/3406G15/998/ FEW CU SE-NE FEW 
CS SW-SE HAZY WND LGT/ 8/105 51005 

1 P.M.
Weather: Overcast Stratus
Temperature: 83F; Dew Point: 62F; Wind: N at 6G12 kts,
Wind: Light
Sea-level pressure: 29.98 ins. Hg, rising then falling 
Visibility: 40 miles 
6-hr Max temp: 84F
6-hr Min temp: 65F
6-hr precip:  0.00 ins.
BHO SA 1755 55 BKN 40 151/83/62/3606G12/998/ 8/200 50000 
10084 20065  

SUMMARY FOR MONDAY, MAY 28, 2018

TEMPERATURE (DEGREES F)
MAX.....60   NORMAL.....70
MIN.....48   NORMAL.....51
MEAN....54   NORMAL.....61

DEPARTURE FROM 30-YEAR NORMAL.........................-7
TOTAL DEPARTURE FOR THE MONTH.......................+131 [+4.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY.............11   DEPARTURE...........+7
TOTAL HEATING UNITS FOR THE MONTH............154   DEPARTURE..........-98
TOTAL HEATING UNITS FOR THE SEASON..........5847   DEPARTURE.........-440
TOTAL HEATING UNITS LAST SEASON TO DATE.....5631   DIFFERENCE........+216

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............0   DEPARTURE...........0
TOTAL COOLING UNITS FOR THE MONTH..............52   DEPARTURE.........+34
TOTAL COOLING UNITS FOR THE SEASON.............52   DEPARTURE.........+32
TOTAL COOLING UNITS LAST SEASON TO DATE........56   DEPARTURE..........-4

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................23 S   AT 10:01 P.M.
                   AERO.........................21 S   AT  9:56 P.M. 
                   ASOS.........................23 SSW AT 10:01 P.M.
                   DAVIS........................22 M   AT  9:56 P.M.** RMY N/A
FASTEST MILE FOR YESTERDAY......................18 S   AT  9:57 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................18 SSW AT 10:02 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE..................18 M   AT  9:58 P.M.**
AVERAGE WIND SPEED AND DIRECTION...............7.5 NE
                   ASOS........................7.6
                   DAVIS.......................7.3 M
** Davis direction malfunctioning 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.15
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........2.00  DEPARTURE......-1.66
                         ASOS..............1.95  
TOTAL PRECIPITATION FOR THE YEAR..........27.31  DEPARTURE......+5.28
                         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/T/0.0/.../..       23 S   AERO 21 S   RMY N/A

5/29 Low temp since midnight is 57F; 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 29
HIGH 93F IN 1919
LOW 35F IN 1902
PRECIP 1.63 INS 1990
PEAK GUST 55e MPH NNW IN 1943, WNW IN 1945

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

TODAY'S REPORT PREPARED BY: Benjamin Turner