Thursday, July 25, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JULY 25, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

COOLER THAN NORMAL AND SLIGHTLY WINDY
ATOP GREAT BLUE HILL….

We saw an average of 50 miles today due to a distant haze.
Wind was light and northeasterly for the majority of the day,
with cloud cover quickly decreasing this morning following
7 A.M. Weather has remained fair overall, with temperatures
reaching 78F by the 1 P.M. observation. That is 3 degrees
below the daily normal maximum of 81F. The low since midnight
is 61F, which is 2 degrees below the daily average minimum of
63F.

Today’s Observations:

7 A.M.
Weather: Broken altocumulus
Temperature: 67F; Dew Point: 57F; Wind: NNE at 7 kts
Sea-level pressure: 30.09 ins. Hg, rising steadily
Visibility: 60 miles, thin smoke layer in all directions
6-hr Max temp: 67F
6-hr Min temp: 61F
24-hr Precip: 0.00 ins.
BHO SA 1155 200 SCT 60 191/67/57/0307/009/ THN K LYR ALQDS/
8/070 53016 10067 20061

10 A.M.
Weather: Scattered cirrus
Temperature: 75F; Dew Point: 58F; Wind: NE at 4 kts,
Wind: Light and variable
Sea-level pressure: 30.12 ins. Hg, rising steadily
Visibility: 65 miles, distant haze
3-hr Precip: 0.00 ins.
BHO SA 1455 250 SCT 65 200/75/58/0304/012/ FEW CU DSNT
HZ ALQDS WND L/V/ 8/102 51009

1 P.M.
Weather: Scattered cumulus
Temperature: 78F; Dew Point: 59F; Wind: NNE at 3 kts,
Wind: Light and variable
Sea-level pressure: 30.12 ins. Hg, falling steadily
Visibility: 45 miles, distant haze
6-hr Max temp: 78F
6-hr Min temp: 67F
6-hr Precip: 0.00 ins.
BHO SA 1755 50 SCT 45 198/78/59/0303/012/ DSNT HZ ALQDS
WND L/V/ 8/200 55002 10078 20067

SUMMARY FOR WEDNESDAY, JULY 24, 2019

TEMPERATURE (DEGREES F)
MAX…..77   NORMAL…..81
MIN…..60   NORMAL…..63
MEAN….69   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL………………….-3
TOTAL DEPARTURE FOR THE MONTH…………………+79 [+3.1 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………4   DEPARTURE………-4
TOTAL COOLING UNITS FOR THE MONTH………….241   DEPARTURE……..+72
TOTAL COOLING UNITS FOR THE SEASON…………330   DEPARTURE……..+32
TOTAL COOLING UNITS LAST SEASON TO DATE…….376   DEPARTURE……..-46

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..14 NE  AT  2:09 P.M.
AERO…………………….15 NE  AT  2:10 P.M.
ASOS…………………….14 E   AT  2:21 P.M.
DAVIS……………………15 E   AT  2:21 P.M.  RMY N/A
FASTEST MILE FOR YESTERDAY………………….10 WSW AT 11:58 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….10 SW  AT 10:41 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………10 WSW AT 11:58 P.M.
AVERAGE WIND SPEED AND DIRECTION……………..5.0 ENE
ASOS……………………..5.7
DAVIS…………………….5.7 E [96 deg.]

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……….4.90  DEPARTURE……+1.90
ASOS…………..4.94
TOTAL PRECIPITATION FOR THE YEAR……….34.77  DEPARTURE……+4.80
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 77/60/69/-3/…./…/..               14 NE  AERO 15 NE  RMY N/A

07/25 Low temp since midnight is 61F; 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 25
HIGH 96F IN 2016
LOW 51F IN 1901,1953
PRECIP 2.25 INS IN 1990
PEAK GUST 88 MPH NW IN 1972

RECORDS FOR JULY 26
HIGH 97F IN 1963
LOW 47F IN 1920
PRE 2.05 INS IN 1899
WIND 74e MPH NNW IN 1940

TODAY’S REPORT PREPARED BY: Benjamin Turner