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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JULY 10, 2018 
ALL TIMES ARE IN EASTERN STANDARD TIME

ANOTHER ABOVE NORMAL HIGH TEMPERATURES DAY ON GREAT 
BLUE HILL... 

High temperatures have been above normal so far for most
of July. Yesterday we had a high of 88F, which is 7 
degrees below the daily normal of 81F. Temperatures have
been warmer so far today than yesterday with a high of
90F by 1:00 P.M, 9 degrees above the daily normal of 81F. 
Sky remained clear with only a few cirrus clouds today. 
Visibility decreased from 80- 60  miles due to a distant 
haze today. Wind continues to be light to moderate and 
shifted today from the SW to the W. 
So far July has been a warm dry month with only one 
day of precipitation and temperatures 5.1 degrees
above normal.  

Today's Observations:

7 A.M.
Weather: Clear, few cirrus N-E
Temperature: 71F; Dew Point: 61F; Wind: WSW at 6 kts,
Wind: Light
Sea-level pressure: 29.94 ins. Hg, falling then rising
Visibility: 80 miles
6-hr Max temp: 71F
6-hr Min temp: 63F
24-hr Precip: 0.00 ins.  
BHO SA 1155 CLR 80 139/71/61/2606/994/ FEW CI N-E 
WND LGT/ 8/001 55002 10071 20063

10 A.M.
Weather: Clear, few cirrus WNW and ENE 
Temperature: 84F; Dew Point: 62F; Wind: W at 6 kts,
Wind: Light
Sea-level pressure: 29.91 ins. Hg, falling, then more quickly 
Visibility: 70 miles, distant haze in all directions 
3-hr Precip: 0.00 ins. 
BHO SA 1455 CLR 70 129/84/62/2706/991/ FEW CI WNW AND ENE 
WND LGT DSNT HZ ALQDS/ 8/001 56010 

1 P.M.
Weather: Clear, few cirrus SW-NE
Temperature: 89F; Dew Point: 59F; Wind: W at 10G20 kts
Sea-level pressure: 29.86 ins. Hg, falling, then more quickly  
Visibility: 60 miles, distant haze in all directions 
6-hr Max temp: 90F
6-hr Min temp: 71F
6-hr precip: 0.00 ins. 
BHO SA 1755 CLR 60 113/89/59/2710G20/986/ FEW CI SW-NE BRUSH 
FIRE ESTMTD 10 MI DSNT HZ ALQDS/ 8/001 58016 10090 20071 

SUMMARY FOR MONDAY, JULY 9, 2018 

TEMPERATURE (DEGREES F)
MAX.....88   NORMAL.....81
MIN.....60   NORMAL.....63
MEAN....74   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL.........................+2
TOTAL DEPARTURE FOR THE MONTH........................+48 [+5.1 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............9   DEPARTURE..........+2
TOTAL COOLING UNITS FOR THE MONTH.............102   DEPARTURE.........+45
TOTAL COOLING UNITS FOR THE SEASON............261   DEPARTURE.........+75
TOTAL COOLING UNITS LAST SEASON TO DATE.......272   DEPARTURE.........-11

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................23 SW AT 2:23 P.M.
                   AERO.........................23 SW AT 2:23 P.M.*
                   ASOS..........................M ***
                   DAVIS........................24 M  AT 1:38 P.M. RMY 24
FASTEST MILE FOR YESTERDAY......................16 SW AT 2:23 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................17 M  AT 2:23 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...................M ***
AVERAGE WIND SPEED AND DIRECTION..............11.5 SSW
                   ASOS..........................M ***
                   DAVIS......................10.8
* Last of multiple occurences 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.11
                         ASOS..............0.00***
TOTAL PRECIPITATION FOR THE MONTH..........0.56  DEPARTURE......-0.43
                         ASOS..............0.00***  
TOTAL PRECIPITATION FOR THE YEAR..........30.73  DEPARTURE......+2.95
                         ASOS.............31.73***

***ASOS system 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 88/60/74/+2/0.00/.../..        23 SW  AERO 23 SW  RMY 24 

7/10 Low temp since midnight is 63F; 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 10
HIGH 99F IN 1911
LOW 46F IN 1890
PRECIP 1.95 INS IN 2015
WIND 75 MPH W IN 1985

RECORDS FOR JULY 11
HIGH 98F IN 1911
LOW 49F IN 1890
PRECIP 1.87 INS IN 1959
WIND 53 MPH NW IN 1988

TODAY'S REPORT PREPARED BY: Kaitlin Geagan