Friday, July 26, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, JULY 26, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

WARM SUNNY DAY WITH LIGHT WIND AND
CLEAR SKIES ON TOP OF THE GREAT BLUE HILL….

Clear skies in the morning with increasing
cloud after the 10 A.M observation.
Distant haze remained visible throughout
the day limiting visibility from 35 to 45
miles. Winds stayed light throughout the
day with speeds staying around 3 to 5 knots.
The high so far today is 83F, which is 2
degrees above the average daily maximum of
81F. The low since midnight is 71F, 8 degrees
above the daily normal minimum of 63F.

Today’s Observations:

7 A.M.
Weather: Clear
Temperature: 71F; Dew Point: 61F; Wind: NNE at 5 kts
Wind: Light
Sea-level pressure: 30.25 ins. Hg, steady, then rising
Visibility: 45 miles, distant haze
6-hr Max temp: 71F
6-hr Min temp: 63F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 45 246/71/61/0305/025/ DSNT HZ ALQDS
WND LGT/ 8/000 53015 10071 20063

10 A.M.
Weather: Clear, few cumulus in all directions
Temperature: 81F; Dew Point: 63F; Wind: ENE at 5 kts,
Wind: Light
Sea-level pressure: 30.27 ins. Hg, steady, then rising
Visibility: 35 miles, distant haze
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 35 253/81/63/0705/027/ FEW CU DSNT
HZ ALQDS WND LGT/ 8/100 53007

1 P.M.
Weather: Scattered cumulus
Temperature: 84F; Dew Point: 60F; Wind: SSW at 3 kts,
Wind: Light
Sea-level pressure: 30.25 ins. Hg, falling, then more quickly
Visibility: 40 miles, distant haze
6-hr Max temp: 84F
6-hr Min temp: 71F
6-hr Precip: 0.00 ins.
BHO SA 1755 50 SCT 40 246/84/60/2103/025/ DNST HZ
ALQDS WND LGT/ 8/100 58007 10084 20071

SUMMARY FOR THURSDAY, JULY 25, 2019

TEMPERATURE (DEGREES F)
MAX…..80   NORMAL…..81
MIN…..61   NORMAL…..63
MEAN….71   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL………………….-1
TOTAL DEPARTURE FOR THE MONTH…………………+78 [+3.1 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………6   DEPARTURE………+2
TOTAL COOLING UNITS FOR THE MONTH………….247   DEPARTURE……..+70
TOTAL COOLING UNITS FOR THE SEASON…………336   DEPARTURE……..+30
TOTAL COOLING UNITS LAST SEASON TO DATE…….388   DEPARTURE……..-52

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..17 SSE  AT  6:09 P.M.
AERO…………………….23 N    AT  3:58 P.M.
ASOS…………………….17 S    AT  6:10 P.M.
DAVIS……………………17 S    AT  5:56 P.M.  RMY 17
FASTEST MILE FOR YESTERDAY………………….13 SSE  AT  6:16 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….13 S    AT  8:15 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………13 S    AT  6:15 P.M.
AVERAGE WIND SPEED AND DIRECTION……………..7.4 ENE
ASOS……………………..7.8
DAVIS…………………….7.9 E [105 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….4.90  DEPARTURE……+1.76
ASOS…………..4.94
TOTAL PRECIPITATION FOR THE YEAR……….34.77  DEPARTURE……+4.66
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 80/61/71/-1/…./…/..

07/24 Low temp since midnight is 63F; 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 26
HIGH 97F IN 1963
LOW 47F IN 1920
PRE 2.05 INS IN 1899
WIND 74e MPH NNW IN 1940

RECORDS FOR JULY 27
HIGH 95F IN 1949, 1963
LOW 50F IN 1920, 2001
PRE 4.01 INS IN 1979
WIND 47 MPH ENE IN 1984

TODAY’S REPORT PREPARED BY: Nicholas Rousseau