Tuesday, July 23, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JULY 23, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

MUCH COOLER THAN NORMAL FOLLOWING LAST NIGHT’S
RAIN….

We measured 1.52 inches from the storms that
began yesterday afternoon at 7 A.M. We then
measured an additional 0.56 inches that fell
between then and the 1 P.M. observation. This
brings our monthly rain total up to 4.33 inches.
Fog limited visibility to a 1/2 mile this morning,
but dissipated as the day went on. About 35 miles
were seen in the afternoon hours. Temperatures
today are notably below normal so far today. The
low since midnight is 58F, 5 degrees below the
daily normal minimum of 63F. The highest temperature
measured at this point is 63F, which is the same as
the normal daily minimum! The record low maximum for
this date is 62F, set in 1904.

Today’s Observations:

7 A.M.
Weather: Light rain and fog
Temperature: 62F; Dew Point: 62F; Wind: ENE at 14G22 kts
Sea-level pressure: 29.80 ins. Hg, steady
Visibility: 1/2 mile, fog
6-hr Max temp: 62F
6-hr Min temp: 62F
24-hr Precip: 1.52 ins.
BHO SA 1155 W3 X 1/2R-F 092/62/62/0514G22/980/ R-CTD/
8//// 53007 10062 20062

10 A.M.
Weather: Moderate rain and fog
Temperature: 59F; Dew Point: 59F; Wind: ENE at 13G25 kts
Sea-level pressure: 29.80 ins. Hg, steady
Visibility: 1 mile, fog
3-hr Precip: 0.43 ins.
BHO SA 1455 W3 X 1RF 092/59/59/0513G25/980/ RCTD/ 8////
6043/ 50000

1 P.M.
Weather: Overcast altostratus, few stratus fractus
Temperature: 63F; Dew Point: 60F; Wind: N at 7 kts
Sea-level pressure: 29.85 ins. Hg, rising steadily
Visibility: 35 miles, distant fog
6-hr Max temp: 63F
6-hr Min temp: 58F
6-hr Precip: 0.56 ins.
BHO SA 1755 E110 OVC 35 107/63/60/3507/985/ FEW STFA DSNT
FG ALQDS/ 8/72/ 6056/ 51015 10063 20058

SUMMARY FOR MONDAY, JULY 22, 2019

TEMPERATURE (DEGREES F)
MAX…..81   NORMAL…..81
MIN…..64   NORMAL…..63
MEAN….73   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL………………….+1
TOTAL DEPARTURE FOR THE MONTH…………………+92 [+4.0 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………8   DEPARTURE……….0
TOTAL COOLING UNITS FOR THE MONTH………….237   DEPARTURE……..+84
TOTAL COOLING UNITS FOR THE SEASON…………326   DEPARTURE……..+44
TOTAL COOLING UNITS LAST SEASON TO DATE…….350   DEPARTURE……..-24

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..35 ENE AT  9:58 P.M.
AERO…………………….37 ENE AT  9:57 P.M.
ASOS…………………….38 ENE AT  9:58 P.M.
DAVIS……………………35 E   AT  9:57 P.M.  RMY 34
FASTEST MILE FOR YESTERDAY………………….26 ENE AT  9:58 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….25 ENE AT  9:59 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………26 ENE AT  9:58 P.M.
AVERAGE WIND SPEED AND DIRECTION…………….11.0 ENE
ASOS…………………….11.6
DAVIS……………………11.6 ENE [56 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….1.52  DEPARTURE……+1.39
ASOS…………..1.54
TOTAL PRECIPITATION FOR THE MONTH……….4.33  DEPARTURE……+1.60
ASOS…………..4.36
TOTAL PRECIPITATION FOR THE YEAR……….34.20  DEPARTURE……+4.50
ASOS………….34.13

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 Low temp since midnight is 58F; 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 23
HIGH 99F IN 1952
LOW 51F IN 1923,1977
PRECIP 1.82 INS IN 1953
PEAK GUST 54e MPH S IN 1946

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

TODAY’S REPORT PREPARED BY: Benjamin Turner