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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JULY 9, 2018 
ALL TIMES ARE IN EASTERN STANDARD TIME

ANOTHER PLEASANT HIGH PRESSURE DAY ON TOP OF 
GREAT BLUE HILL...

We had high pressure again making for another nice
day at Blue Hill Observatory. The pressure began to 
drop mid-morning and the wind from the SW became 
stronger than the light wind from yesterday with a 
gust up to 21 MPH. The high temperature so far 
today has been a slightly above normal 86F degrees. 
This is 5 degrees above the daily normal of 81F. 
Visibility was excellent at 80 miles all day with
a thin smoke layer along the horizon during the
morning observations. We had nice dry air and low 
humidity today with dew points in the high 50's. 
So far July has been a warm dry month with only one 
day of precipitation and temperatures 5.6 degrees
above normal.  

Today's Observations:

7 A.M.
Weather: Scattered thin cirrus 
Temperature: 66F; Dew Point: 56F; Wind: WSW at 9 kts
Sea-level pressure: 30.22 ins. Hg, falling then steady
Visibility: 80 miles, thin smoke layer in all directions
6-hr Max temp: 66F
6-hr Min temp: 60F
24-hr Precip: 0.00 ins.  
BHO SA 1155 250 –SCT 80 234/66/56/2409/022/ THN K LYR 
ALQDS/ 8/001 58003 10066 20060

10 A.M.
Weather: Scattered thin cirrus 
Temperature: 79F; Dew Point: 59F; Wind: SSW at 7 kts
Sea-level pressure: 30.19 ins. Hg, falling, then more quickly 
Visibility: 80 miles
3-hr Precip: 0.00 ins. 
BHO SA 1455 250 –SCT 80 225/79/59/2107/019/ THN K LYR 
E-N/ 8/001 58009

1 P.M.
Weather: Few cirrus ENE-SSW
Temperature: 86F; Dew Point: 58F; Wind: SW at 10G18 kts
Sea-level pressure: 30.12 ins. Hg, falling, then more quickly  
Visibility: 80 miles
6-hr Max temp: 86F
6-hr Min temp: 66F
6-hr precip: 0.00 ins. 
BHO SA 1755 CLR 80 201/86/58/2310G18/012/ FEW CI ENE-SSW/ 
8/001 58024 10086 20066   

SUMMARY FOR SUNDAY, JULY 8, 2018 

TEMPERATURE (DEGREES F)
MAX.....83   NORMAL.....80
MIN.....57   NORMAL.....63
MEAN....70   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL.........................-2
TOTAL DEPARTURE FOR THE MONTH........................+46 [+5.6 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............5   DEPARTURE..........-2
TOTAL COOLING UNITS FOR THE MONTH..............93   DEPARTURE.........+44
TOTAL COOLING UNITS FOR THE SEASON............252   DEPARTURE.........+72
TOTAL COOLING UNITS LAST SEASON TO DATE.......266   DEPARTURE.........-14

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................23 S AT 7:18 P.M.
                   AERO.........................21 S AT 7:16 P.M.*
                   ASOS..........................M ***
                   DAVIS.........................M ***     RMY 22
FASTEST MILE FOR YESTERDAY......................19 S AT 7:29 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE....................M ***
MAXIMUM 2-MINUTE DAVIS AVERAGE...................M ***
AVERAGE WIND SPEED AND DIRECTION...............8.0 SSW
                   ASOS..........................M ***
                   DAVIS.........................M
* Last of multiple occurrences 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.12
                         ASOS..............0.00***
TOTAL PRECIPITATION FOR THE MONTH..........0.56  DEPARTURE......-0.32
                         ASOS..............0.00***  
TOTAL PRECIPITATION FOR THE YEAR..........30.73  DEPARTURE......+3.06
                         ASOS.............31.73***

***ASOS and parts of Davis systems down due to lightning storm

PRELIMINARY CLIMATE SUMMARY FOR JULY 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

7/01 94/72/83/+13/0.00/.../..       21 ESE AERO 18 ESE RMY 19 
7/02 90/68/79/+9/0.00/.../..        21 S   AERO 21 S   RMY 22
7/03 94/69/82/+11/0.00/.../..       20 SSW AERO 18 SW  RMY 19 TSTM
7/04 89/73/81/+10/0.00/.../..       17 NE  AERO 15 NE  RMY 16
7/05 91/73/82/+11/0.00/.../..       29 SSW AERO 28 SSW RMY N/A
7/06 80/59/70/-1/0.56/.../..        37 NNW AERO 38 SW  RMY 40 TSTM
7/07 78/54/66/-5/0.00/.../..        22 N   AERO 18 N   RMY N/A 
7/08 83/57/70/-2/0.00/.../..        23 S   AERO 21 S   RMY 22  

7/09 Low temp since midnight is 60F; normal low is now 63F

DAILY RECORDS FOR JULY 2018

07/01/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 72F, 
          TIES PREVIOUS RECORD OF 72F SET IN 1968

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

RECORDS FOR JULY 9
HIGH 98F IN 1912
LOW 47F IN 1909
PRECIP 3.74 INS IN 1921
WIND 46 MPH NW IN 1992 

RECORDS FOR JULY 10
HIGH 99F IN 1911
LOW 46F IN 1890
PRECIP 1.95 INS IN 2015
WIND 75 MPH W IN 1985

TODAY'S REPORT PREPARED BY: Kaitlin Geagan