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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JULY 31, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

HAZY DAY WITH HIGH TEMPERATURES AND INCREASING
CLOUD COVER...

Today has been much warmer than usual, with a high 
temperature so far of 90F. This temperature is 9
degrees above our normal maximum temperature of 81F.
Hazy conditions were experienced at each observation,
and continue to persist. Since about 11:30, pressure
has been decreasing, and cloud cover has been increasing.
Our low since midnight is 71F, which is 8 degrees above
our normal low of 63F. 


Today's Observations:

7 A.M.
Weather: Scattered cirrus
Temperature: 76F; Dew Point: 70F; Wind: SSW at 8 kts
Sea-level pressure: 30.02 ins. Hg, rising steadily
Visibility: 20 miles, Haze
6-hr Max temp: 76F
6-hr Min temp: 71F
24-hr Precip: 0.00 ins.
BHO SA 1155 250 SCT 20 165/76/70/2108/002/ HAZY/ 8/004 
52006 10076 20071

10 A.M.
Weather: Scattered cirrus
Temperature: 86F; Dew Point: 70F; Wind: SSW at 6 kts
Sea-level pressure: 30.03 ins. Hg, rising, then steady
Visibility: 20 miles, Haze
3-hr Precip: 0.00 ins.
BHO SA 1455 250 SCT 20 170/86/70/2006/003/ HAZY/ 8/004 
51005

1 P.M.
Weather: Scattered cumulus, Scattered cirrus
Temperature: 89F; Dew Point: 67F; Wind: S at 10G17 kts
Sea-level pressure: 30.00 ins. Hg, falling, then more quickly
Visibility: 30 miles, Haze
6-hr Max temp: 90F
6-hr Min temp: 76F
6-hr Precip: 0.00 ins. 
BHO SA 1755 50 SCT E250 BKN 30 158/89/67/2110G17/000/ HAZY/ 
8/304 58012 10090 20076

SUMMARY FOR TUESDAY, JULY 30, 2019 

TEMPERATURE (DEGREES F)
MAX.....93   NORMAL.....81
MIN.....71   NORMAL.....63
MEAN....82   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL.....................+10
TOTAL DEPARTURE FOR THE MONTH.....................+104 [+3.3 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............17   DEPARTURE........+10
TOTAL COOLING UNITS FOR THE MONTH.............308   DEPARTURE........+93
TOTAL COOLING UNITS FOR THE SEASON............397   DEPARTURE........+53
TOTAL COOLING UNITS LAST SEASON TO DATE.......445   DEPARTURE........-48

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................24 S   AT 5:02 P.M.
                   AERO.........................24 S   AT 5:02 P.M.
                   ASOS.........................24 SSW AT 5:02 P.M.
                   DAVIS........................23 S   AT 5:55 P.M. RMY 23
FASTEST MILE FOR YESTERDAY......................17 S   AT 4:59 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................17 SSW AT 5:02 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................17 SSW AT 5:02 P.M.
AVERAGE WIND SPEED AND DIRECTION...............9.2 SSW
                   ASOS........................9.5
                   DAVIS.......................8.9 SW [213 deg.]


PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.15
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........4.91  DEPARTURE......+1.04
                         ASOS..............4.95
TOTAL PRECIPITATION FOR THE YEAR..........34.78  DEPARTURE......+3.94
                         ASOS.............34.72

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 77/60/69/-3/..../.../..               14 NE  AERO 15 NE  RMY N/A
07/25 80/61/71/-1/..../.../..               17 SSE AERO 23 N   RMY 17
07/26 84/62/73/+1/0.00/.../..               22 SSE AERO 23 SSE RMY 20
07/27 83/64/74/+2/..../.../..               21 S   AERO 23 S   RMY 21
07/28 89/64/77/+5/..../.../..               25 WSW AERO 36 WSW RMY 26
07/29 89/71/80/+8/..../.../..               23 W   AERO 25 W   RMY 21
07/30 93/71/82/+10/0.00/.../..              24 S   AERO 24 S   RMY 23

7/31 Low temp since midnight is 71F; 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 31
HIGH 95F IN 1917
LOW 50F IN 1895,1918
PRECIP 1.34 INS IN 1892
PEAK GUST 43e MPH WNW SW IN 1953, 43 SW IN 1971

RECORDS FOR AUGUST 1
HIGH 97F IN 1917
LOW 49F IN 1891
PRECIP 3.61 INCHES IN 1927
PEAK GUST 41 MPH NNW IN 1985

TODAY'S REPORT PREPARED BY: Samantha Richard