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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JULY 12, 2018 
ALL TIMES ARE IN EASTERN STANDARD TIME

ANOTHER BEAUTIFUL DAY ON GREAT BLUE HILL..

We had a sunny, clear, dry day with comfortable 
temperatures and humidity. The high temperature
so far today is 76F, which is 5 degrees below the
daily normal of 81F. 
We had low humidity and dew points in the low 50's
for most of the day. The dry air made for excellent
visibility at 80 miles in the morning and 70 miles
at 1:00 P.M. The wind was coming from the NE and was 
fairly light today. 
Even with cooler temperatures yesterday July is still 
running just over 4 degrees above normal. We had only
had two days of precipitation both caused by overnight
thunderstorms with heavy rain making the precipitation 
total just above normal so far this month.
 
Today's Observations:

7 A.M.
Weather: Clear, few cirrus NNE-S 
Temperature: 66F; Dew Point: 55F; Wind: N at 6 kts,
Wind: Light
Sea-level pressure: 30.16 ins. Hg, rising steadily 
Visibility: 80 miles
6-hr Max temp: 66F
6-hr Min temp: 58F
24-hr Precip: 0.00 ins.  
BHO SA 1155 CLR 80 214/66/55/3606/016/ FEW CI NNE-S WND LGT/ 
8/001 52013 10066 20058

10 A.M.
Weather: Scattered cirrostratus, few distant cumulus W-N 
Temperature: 74F; Dew Point: 51F; Wind: NE at 7 kts
Sea-level pressure: 30.20 ins. Hg, rising steadily  
Visibility: 80 miles
3-hr Precip: 0.00 ins. 
BHO SA 1455 250 SCT 80 227/74/51/0607/020/ FEW CU DSNT W-N/ 
8/105 52013

1 P.M.
Weather: Scattered cumulus, scattered cirrostratus
Temperature: 76F; Dew Point: 50F; Wind: ENE at 7 kts
Sea-level pressure: 30.22 ins. Hg, falling the rising   
Visibility: 70 miles
6-hr Max temp: 76F
6-hr Min temp: 66F
6-hr precip: 0.00 ins. 
BHO SA 1755 55 SCT 250 SCT 70 234/76/50/0607/022/ 8/105 
51007 10076 20066

SUMMARY FOR WEDNESDAY, JULY 11, 2018 

TEMPERATURE (DEGREES F)
MAX.....73   NORMAL.....81
MIN.....62   NORMAL.....63
MEAN....68   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL.........................-4
TOTAL DEPARTURE FOR THE MONTH........................+49 [+4.3 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............3   DEPARTURE..........-4
TOTAL COOLING UNITS FOR THE MONTH.............117   DEPARTURE.........+46
TOTAL COOLING UNITS FOR THE SEASON............276   DEPARTURE.........+76
TOTAL COOLING UNITS LAST SEASON TO DATE.......290   DEPARTURE.........-14

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................28 NE  AT  4:26 A.M.
                   AERO.........................25 NE  AT  9:30 A.M.*
                   ASOS.........................29 NE  AT 10:59 A.M.
                   DAVIS........................28 ENE AT  4:27 A.M. RMY 27
FASTEST MILE FOR YESTERDAY......................21 NE  AT  4:11 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................21 ENE AT  4:13 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................21 ENE AT  4:13 A.M. 
AVERAGE WIND SPEED AND DIRECTION..............11.0 NE
                   ASOS.......................11.2
                   DAVIS......................11.4 ENE 
* Last of multiple occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.13
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.29  DEPARTURE......+0.04
                         ASOS..............1.31 
TOTAL PRECIPITATION FOR THE YEAR..........30.73  DEPARTURE......+3.42
                         ASOS.............33.04

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 91/63/77/+5/..../.../..        24 W   AERO 22 W   RMY N/A
7/11 73/62/68/-4/..../.../..        28 NE  AERO 25 NE  RMY 27 

7/12 Low temp since midnight is 58F; 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 12
HIGH 97F IN 1943
LOW 48F IN 1945
PRECIP 1.43 INS IN 1975
WIND 48e MPH SSW IN 1944

RECORDS FOR JULY 13
HIGH 95F IN 1894
LOW 52F IN 1888, 1895, 1939, 1973
PRECIP 3.54 INS IN 1996
WIND 55 MPH SE IN 1996

TODAY'S REPORT PREPARED BY: Kaitlin Geagan