Sunday, July 21, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JULY 21, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

HOT AND PARTLY CLOUDY WITH IMPROVING
VISIBILITY….

We observed mostly cloudy skies this morning,
with only some scattered cumulus being seen at
1 P.M. There has been a moderate westerly wind
throughout the day, with a peak gust of 29 mph.
The high so far today is 90F, which is 9 degrees
higher than the average daily maximum of 81F.
The record high maximum temperature for this
date is 100F in 1977. The low since midnight
is 76F, 13 degrees above the daily normal
minimum of 63F.

Even though there was not a record set for
maximum temperature yesterday, the daily minimum was
75F, 2 degrees above the previous record of 73F; set
in 1977 and 2019!

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, broken cirrostratus
Temperature: 80F; Dew Point: 74F; Wind: WSW at 10G18 kts
Sea-level pressure: 29.75 ins. Hg, rising steadily
Visibility: 45 miles
6-hr Max temp: 80F
6-hr Min temp: 76F
24-hr Precip: 0.00 ins.
BHO SA 1155 110 SCT E250 BKN 45 075/80/70/2510G18/975/
8/078 53002 10080 20076

10 A.M.
Weather: Broken altocumulus
Temperature: 83F; Dew Point: 72F; Wind: WSW at 11G18 kts
Sea-level pressure: 29.75 ins. Hg, steady
Visibility: 70 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 110 BKN 70 075/83/72/2411G18/975/ 8/070
50000

1 P.M.
Weather: Scattered cumulus
Temperature: 89F; Dew Point: 73F; Wind: W at 15G21 kts
Sea-level pressure: 29.71 ins. Hg, falling steadily
Visibility: 70 miles
6-hr Max temp: 90F
6-hr Min temp: 80F
6-hr Precip: 0.00 ins.
BHO SA 1755 50 SCT 70 062/89/73/2615G21/971/ 8/100
56013 10090 20080

SUMMARY FOR SATURDAY, JULY 20, 2019

TEMPERATURE (DEGREES F)
MAX…..93   NORMAL…..81
MIN…..75   NORMAL…..63
MEAN….84   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL…………………+12
TOTAL DEPARTURE FOR THE MONTH…………………+79 [+3.8 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..19   DEPARTURE……..+11
TOTAL COOLING UNITS FOR THE MONTH………….210   DEPARTURE……..+73
TOTAL COOLING UNITS FOR THE SEASON…………299   DEPARTURE……..+33
TOTAL COOLING UNITS LAST SEASON TO DATE…….343   DEPARTURE……..-44

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..21 WSW AT 11:08 P.M.
AERO…………………….22 WSW AT  4:32 P.M.
ASOS…………………….19 W   AT  9:01 A.M.
DAVIS……………………19 W   AT 11:24 P.M.  RMY N/A
FASTEST MILE FOR YESTERDAY………………….14 WSW AT 11:28 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….14 W   AT 11:24 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………15 WSW AT 11:24 P.M.
AVERAGE WIND SPEED AND DIRECTION……………..9.4 WSW
ASOS……………………..9.6
DAVIS…………………….9.9 WSW [252 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……….2.81  DEPARTURE……+0.34
ASOS…………..2.82
TOTAL PRECIPITATION FOR THE YEAR……….32.68  DEPARTURE……+3.24
ASOS………….32.50

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/…/..               21 NNW AERO 21 NNW RMY N/A
07/02 82/65/74/+4/0.00/…/..               23 W   AERO 23 W   RMY 23
07/03 89/67/78/+7/0.00/…/..               18 S   AERO 18 S   RMY 18
07/04 88/68/78/+7/0.00/…/..               17 SSW AERO M  M   RMY 17
07/05 87/69/78/+7/0.00/…/..               21 SW  AERO M  M   RMY 21
07/06 90/71/81/+10/0.83/…/..              26 WNW AERO M  M   RMY N/A
07/07 78/64/71/0/0.00/…/..                30 NE  AERO M  M   RMY N/A
07/08 79/59/69/-3/0.00/…/..               16 N   AERO 18 SSW RMY N/A
07/09 85/61/73/+1/0.00/…/..               18 NW  AERO 16 NW  RMY 18
07/10 88/69/79/+7/0.00/…/..               20 ESE AERO 16 ESE RMY 17
07/11 81/67/74/+2/0.62/…/..               35 S   AERO 33 S   RMY 36
07/12 84/68/76/+4/0.00/…/..               31 WNW AERO 30 WNW RMY 32
07/13 85/65/75/+3/0.00/…/..               21 W   AERO 20 WSW RMY 20
07/14 87/68/78/+6/0.00/…/..               25 W   AERO 21 W   RMY 23
07/15 82/63/73/+1/0.00/…/..               24 WNW AERO 23 WNW RMY 22
07/16 86/65/76/+4/0.00/…/..               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 Low temp since midnight is 76F; normal low is 63F

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

RECORDS FOR JULY 21
HIGH 100F IN 1977 [RECORD FOR MONTH] LOW 48F IN 1890
PRECIP 2.09 INS IN 1938
PEAK GUST 60e MPH WNW IN 1977

RECORDS FOR JULY 22
HIGH 99F IN 1926, 2011
LOW 52F IN 1890
PRECIP 1.73 INS IN 1900
PEAK GUST 55 MPH IN 1983

TODAY’S REPORT PREPARED BY: Benjamin Turner