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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JULY 24, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

FAIR WEATHER WITH LIGHT WIND AND LIMITED VISIBILITY....

We observed a limited visibility of 30 miles this morning,
which increased to 40 miles due to a decrease in haze. Wind 
was calm at the 7 A.M. observation, and light and variable at
and following 10 A.M. The highest wind seen today was six mph 
at most. The low since midnight is 60F, 3 degrees below the 
daily normal minimum of 63F. The highest temperature so far 
today is 76F, which is the 5 degrees below the average maximum
of 81F.   

   
Today's Observations:

7 A.M.
Weather: Broken altostratus, few cumulus
Temperature: 64F; Dew Point: 62F; Wind: Calm
Sea-level pressure: 29.96 ins. Hg, rising steadily
Visibility: 30 miles, smoke layer along horizon
6-hr Max temp: 64F
6-hr Min temp: 60F
24-hr Precip: 0.57 ins.
BHO SA 1155 E100 BKN 30 146/64/62/0000/996/ FEW CU K LYR 
ALG HRZN WND CALM/ 8/120 70057 51018 10064 20060  

10 A.M.
Weather: Scattered cumulus, broken altostratus and
cirrostratus
Temperature: 70F; Dew Point: 58F; Wind: NE at 3 kts,
Wind: Light and variable
Sea-level pressure: 29.96 ins. Hg, rising steadily
Visibility: 40 miles, thin smoke layer
3-hr Precip: 0.00 ins.
BHO SA 1455 50 SCT E110 BKN 300 BKN 40 147/70/58/0503/996/ 
THN K LYR ALQDS WND L/V/ 8/155 53001  

1 P.M.
Weather: Scattered cumulus, scattered cirrocumulus
Temperature: 75F; Dew Point: 59F; Wind: NE at 3 kts,
Wind: Light and variable
Sea-level pressure: 29.94 ins. Hg, falling steadily
Visibility: 40 miles, distant haze
6-hr Max temp: 76F
6-hr Min temp: 64F
6-hr Precip: 0.00 ins. 
BHO SA 1755 50 SCT 250 BKN 40 142/75/59/0503/994/ 
DSNT HZ ALQDS WND L/V/ 8/109 58005 10076 20064   

SUMMARY FOR TUESDAY, JULY 23, 2019 

TEMPERATURE (DEGREES F)
MAX.....66   NORMAL.....81
MIN.....58   NORMAL.....63
MEAN....62   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL.....................-10
TOTAL DEPARTURE FOR THE MONTH.....................+82 [+3.4 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............0   DEPARTURE.........-8
TOTAL COOLING UNITS FOR THE MONTH.............237   DEPARTURE........+76
TOTAL COOLING UNITS FOR THE SEASON............326   DEPARTURE........+36
TOTAL COOLING UNITS LAST SEASON TO DATE.......362   DEPARTURE........-36

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................30 NNE AT 10:08 A.M. 
                   AERO.........................33 NNE AT 10:05 A.M.  
                   ASOS.........................31 ENE AT  4:36 A.M.
                   DAVIS........................32 ENE AT  4:36 A.M.  RMY 30
FASTEST MILE FOR YESTERDAY......................22 NNE AT 10:04 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................22 NE  AT 10:06 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................22 NE  AT 10:19 A.M.
AVERAGE WIND SPEED AND DIRECTION.................9.2 NE
                   ASOS..........................9.3
                   DAVIS.........................9.5 ENE [53 deg.]


PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.57  DEPARTURE......+0.43
                         ASOS..............0.58
TOTAL PRECIPITATION FOR THE MONTH..........4.90  DEPARTURE......+2.03
                         ASOS..............4.94
TOTAL PRECIPITATION FOR THE YEAR..........34.77  DEPARTURE......+4.93
                         ASOS.............34.71

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

07/01 83/58/71/+1/0.00/896/98               21 NNW AERO 21 NNW RMY N/A
07/02 82/65/74/+4/0.00/329/36               23 W   AERO 23 W   RMY 23
07/03 89/67/78/+7/0.00/866/95               18 S   AERO 18 S   RMY 18
07/04 88/68/78/+7/0.00/748/82               17 SSW AERO M  M   RMY 17
07/05 87/69/78/+7/0.00/829/91               21 SW  AERO M  M   RMY 21
07/06 90/71/81/+10/0.83/646/71              26 WNW AERO M  M   RMY N/A
07/07 78/64/71/0/0.00/827/91                30 NE  AERO M  M   RMY N/A
07/08 79/59/69/-3/0.00/763/84               16 N   AERO 18 SSW RMY N/A
07/09 85/61/73/+1/0.00/871/96               18 NW  AERO 16 NW  RMY 18
07/10 88/69/79/+7/0.00/607/67               20 ESE AERO 16 ESE RMY 17
07/11 81/67/74/+2/0.62/000/00               35 S   AERO 33 S   RMY 36
07/12 84/68/76/+4/0.00/316/35               31 WNW AERO 30 WNW RMY 32
07/13 85/65/75/+3/0.00/812/90               21 W   AERO 20 WSW RMY 20
07/14 87/68/78/+6/0.00/702/78               25 W   AERO 21 W   RMY 23
07/15 82/63/73/+1/0.00/791/88               24 WNW AERO 23 WNW RMY 22
07/16 86/65/76/+4/0.00/682/76               23 W   AERO 21 W   RMY 21
07/17 90/70/80/+8/1.32/.../..               44 W   AERO M  M   RMY 47 
07/18 72/61/67/-5/0.04/.../..               33 NE  AERO 36 NE  RMY 33
07/19 89/61/75/+3/0.00/.../..               24 WSW AERO 26 SW  RMY 25
07/20 93/75/84/+12/0.00/.../..              21 WSW AERO 22 WSW RMY N/A
07/21 92/76/84/+12/0.00/.../..              31 W   AERO 35 W   RMY 31
07/22 81/64/73/+1/..../.../..               35 ENE AERO 37 ENE RMY 34
07/23 66/58/62/-10/..../.../..              30 NNE AERO 33 NNE RMY 30

07/24 Low temp since midnight is 60F; normal low is 63F

DAILY RECORDS FOR JULY 2019

7/20/19: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 75F,
BREAKS PREVIOUS RECORD OF 73F SET IN 1977, 2015

7/21/19: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 76F,
BREAKS PREVIOUS RECORD OF 75F SET IN 1991


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

RECORDS FOR JULY 24
HIGH 96F IN 1987
LOW 49F IN 1893,1912
PRECIP 2.27 INS IN 2008
PEAK GUST 46 MPH NE IN 2009

RECORDS FOR JULY 25
HIGH 96F IN 2016
LOW 51F IN 1901,1953
PRECIP 2.25 INS IN 1990
PEAK GUST 88 MPH NW IN 1972

TODAY'S REPORT PREPARED BY: Benjamin Turner