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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JUNE 4, 2018  
ALL TIMES ARE IN EASTERN STANDARD TIME

A WET AND BELOW SEASONABLE DAY ON THE 
GREAT BLUE HILL...

Humidity stayed high at 98% this morning with foggy conditions 
obscuring visibility, only being able to see 5 miles in most areas, 
but limiting to only 1 mile from the NNE-NNW. Rain began overnight 
and by the 7 A.M observation we measured 0.13 ins of precipitation.
At the 1 P.M. observation, an additional .56 ins was measured. 
Visibility increased by 1 P.M. Being able to see 10 miles NNW-NNE, 
and 1 mile NNE-NNW. So far today today, we have reached a maximum
temperature of 51F which is 21F degrees lower than than the normal
72F. The low since midnight was 45F which is 4F degrees away from 
record breaking low minimum temperature of 41F set in 1915 and 1926. 
   
PRELIMINARY STATS FOR MAY 2018

TEMPERATURE, Deg. F
Avg. Max. 72.2 [+5.9]
Avg. Min. 51.3 [+3.5]
Mean      61.8 [+4.7]
24-hour corrected mean: 61.0
Max. for month: 90F on 3rd
Min. for month: 39F on 1st

HEATING DEGREE DAYS
Total heating units:   154 [-114]
Total for the season:  5847 [-456]
Total for last season: 5662

COOLING DEGREE DAYS
Total cooling units:   62 [+40]
Total for the season:  62 [+38]
Total for last season: 56

PRECIPITATION, Inches
Total: 2.01 ins. [-2.10]
Greatest in 24 hrs: 0.74 ins. on 15th

SNOWFALL, Inches
Total: 0.0 ins. [-0.0]

WIND, mph
Avg. uncorrected wind speed: 10.3
Avg. corrected wind speed: 10.8
Prevailing wind direction: SSW at 14%
Peak gust and direction: 51 NW on 15th

SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes: N/A

Today's Observations:

7 A.M.
Weather: Rain and fog, overcast nimbostratus 
Temperature: 49F; Dew Point: 48F; Wind: E at 9G16 kts
Sea-level pressure: 29.88 ins. Hg, falling, then steady
Visibility: 5 miles, except 1 mile NNW-NNE
6-hr Max temp: 49F
6-hr Min temp: 45F
24-hr Precip: 0.13 ins.
BHO SA 1155 E8 OVC 5RF 117/49/48/1009G16/988/ VSBY NNW-NNE
1/ 8/02/ 57019 MANUAL 70013 ASOS 70007 10049 20045

10 A.M.
Weather: Rain and fog, overcast nimbostratus, broken stratus 
fractus drifting below the summit 
Temperature: 49F; Dew Point: 48F; Wind: ENE at 8G15 kts
Sea-level pressure: 29.85 ins. Hg, falling, then more rapidly
Visibility: 5 miles, except 1 mile NNW-NNE
3-hr Precip: 0.43 ins.
BHO SA 1455 E8 BKN E12 OVC 5RF 109/49/48/0708G15/985/ STRA DRFTG 
BLO SMT NNE-NNW VSBY NNW-NNE 1/2/ 8/72/ 58008 MANUAL 6043/ 
ASOS 60048
 
1 P.M.
Weather: Rain and fog, overcast nimbostratus, broken stratus
fractus 
Temperature: 51F; Dew Point: 49F; Wind: ENE at 13G22 kts
Sea-level pressure: 29.78 ins. Hg, rising then falling
Visibility: 10 miles, except 1 mile NNE-NNW
6-hr Max temp: 51F
6-hr Min temp: 48F
6-hr precip:  0.59 ins.
BHO SA 1755 E8 BKN E12 OVC 10R- 085/51/49/0613G22/978/
VSBY 1 NNE-NNW/ 8/72/ 58024 MANUAL 6059/ ASOS 60067 
10051 20048   
 

SUMMARY FOR SUNDAY, JUNE 3, 2018

TEMPERATURE (DEGREES F)
MAX.....59   NORMAL.....71
MIN.....45   NORMAL.....53
MEAN....52   NORMAL.....62

DEPARTURE FROM 30-YEAR NORMAL.......................-10
TOTAL DEPARTURE FOR THE MONTH........................+3 [+0.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY.............13   DEPARTURE...........+9
TOTAL HEATING UNITS FOR THE MONTH.............13   DEPARTURE...........-1
TOTAL HEATING UNITS FOR THE SEASON..........5860   DEPARTURE.........-457
TOTAL HEATING UNITS LAST SEASON TO DATE.....5675   DIFFERENCE........+185

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............0   DEPARTURE..........-2
TOTAL COOLING UNITS FOR THE MONTH...............7   DEPARTURE..........+2
TOTAL COOLING UNITS FOR THE SEASON.............69   DEPARTURE.........+40
TOTAL COOLING UNITS LAST SEASON TO DATE........58   DEPARTURE.........+11

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................28 ENE AT  9:54 A.M.
                   AERO.........................25 ENE AT  9:54 A.M. 
                   ASOS.........................28 ENE AT  8:40 A.M.
                   DAVIS........................25 M   AT  8:39 A.M.** RMY N/A
FASTEST MILE FOR YESTERDAY......................20 ENE AT  3:16 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................21 E   AT  3:46 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE..................20 M   AT  3:46 P.M.**
AVERAGE WIND SPEED AND DIRECTION...............12.0 ENE
                   ASOS........................12.5
                   DAVIS.......................11.5 

** Davis direction malfunctioning 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.13  DEPARTURE......-0.03
                         ASOS..............0.07
TOTAL PRECIPITATION FOR THE MONTH..........0.13  DEPARTURE......-0.36
                         ASOS..............0.07  
TOTAL PRECIPITATION FOR THE YEAR..........27.45  DEPARTURE......+4.48
                         ASOS.............28.94

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/0.0/551/63       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/-4/0.00/0.0/272/31    32 ENE AERO 28 ENE RMY 30
5/17 72/51/62/+5/0.02/0.0/000/00    17 SW  AERO 14 SW  RMY N/A
5/18 62/43/53/-5/0.00/0.0/467/53    35 ENE AERO 33 ENE RMY N/A
5/19 57/43/50/-8/0.15/0.0/133/15    22 E   AERO 17 E   RMY N/A
5/20 77/54/66/+8/0.27/0.0/000/00    33 SW  AERO 31 SW  RMY 33 TSTM
5/21 75/52/64/+5/0.00/0.0/861/97    22 W   AERO 18 W   RMY 20
5/22 68/51/60/+1/0.04/0.0/000/00    23 SSW AERO 21 S   RMY 22
5/23 82/51/67/+8/0.06/0.0/677/76    33 NNW AERO 33 NNW RMY 34 TSTM
5/24 74/50/62/+3/0.00/0.0/795/89    28 SSW AERO 25 SSW RMY 27 
5/25 86/50/68/+8/0.00/0.0/779/87    40 W   AERO 39 W   RMY 43
5/26 88/61/75/+15/0.00/0.0/502/56   38 ENE AERO 38 ENE RMY 39
5/27 61/47/54/-6/0.07/0.0/000/00    32 ENE AERO 30 ENE RMY N/A
5/28 60/48/54/-7/0.05/0.0/027/03    23 S   AERO 21 S   RMY N/A
5/29 85/56/71/+10/0.00/0.0/775/86   23 WSW AERO 23 WSW RMY N/A
5/30 72/59/66/+5/0.00/0.0/758/84    21 S   AERO 20 S   RMY 21 
5/31 81/54/68/+7/0.00/0.0/759/84    28 S   AERO 28 S   RMY 29 

PRELIMINARY CLIMATE SUMMARY FOR JUNE CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/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

6/01 78/62/70/+8/T/.../..            21 S   AERO 21 S   RMY N/A
6/02 79/54/67/+5/0.00/.../..         26 ENE AERO 25 ENE RMY 27
6/03 59/45/52/-10/0.00/.../..        28 ENE AERO 25 ENE RMY N/A  

6/04  Low temp since midnight is 52F; normal low is now 53F

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 RECORDS FOR JUNE 2018

None so far.

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):    

RECORDS FOR JUNE 4
HIGH 99F IN 1919 [Record for month]
LOW 41F IN 1915,1926
PRECIP 1.52 INS IN 2007 
PEAK GUST 48 MPH SSE IN 1983

RECORDS FOR JUNE 5
HIGH 95F IN 1930
LOW 41F IN 1891
PRECIP 2.83 INS IN 1982
PEAK GUST 57 MPH NNW IN 1988

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