Wednesday, July 26, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JULY 26, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

CLEAR START TO DAY, TEMPS REBOUND TO UPPER 70s

Skies were completely clear at the 7:00AM EST observation
and remained clear with just few cumulus through the morning.
Diurnal cumulus had become scattered by early afternoon.
Clear conditions allowed for visibility to return 70 miles
today with looming mountains during the 7:00AM ob.

Dew points were in the upper 50s in the morning but fell into
the lower 50s in the afternoon.  Winds have been light and
quite variable since 7:00AM.  Temperatures had reached 77F by
1:00PM and are expected to rise slightly higher due to the
partly sunny skies.  The below average temperatures over the
past few days have nearly erased the above normal departure
for the month. July 2017 now measures only 6F above normal
through July 25.

Today’s Observations:

7 A.M.
Weather: Sky clear, mountains looming WNW-NW
Temperature: 62F; Dew Point: 56F; Wind: N at 8 kts
Sea-level pressure: 30.24 ins. Hg, rising, then more quickly
Visibility: 70 miles
6-hr Max temp: 62F
6-hr Min temp: 55F
24-hr precip: Trace
BHO SA 1155 CLR 70 242/62/56/3608/024/ SKC/ 53007 10062 20055

10 A.M.
Weather: Few cumulus in all directions
Temperature: 72F; Dew Point: 57F; Wind: estimated NNW at 2 kts,
Wind: Light and variable
Sea-level pressure: 30.26 ins. Hg, rising then falling
Visibility: 70 miles
BHO SA 1455 CLR 70 246/72/57/E3302/026/ FEW CU ALQDS WND L/V/
8/100 50004

1 P.M.
Weather: Scattered cumulus
Temperature: 76F; Dew Point: 51F; Wind: SE at 4 kts,
Wind: Light and variable
Sea-level pressure: 30.20 ins. Hg, falling, then more quickly
Visibility: 70 miles
6-hr Max temp: 77F
6-hr Min temp: 62F
BHO SA 1755 39 SCT 70 228/76/51/1304/020/ WND L/V/ 8/100 56018
10077 20062

SUMMARY FOR TUESDAY, JULY 25, 2017

TEMPERATURE (DEGREES F)
MAX…..63   NORMAL…..81
MIN…..54   NORMAL…..63
MEAN….59   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL……………………-13
TOTAL DEPARTURE FOR THE MONTH…………………….+6 [0.0 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE……….-8
TOTAL COOLING UNITS FOR THE MONTH………….200   DEPARTURE………+23
TOTAL COOLING UNITS FOR THE SEASON…………401   DEPARTURE………+95
TOTAL COOLING UNITS LAST SEASON TO DATE…….400   DEPARTURE……….+1

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….23 NNE AT 1:46 A.M.
AERO……………………21 NNE AT 1:45 A.M.
ASOS……………………21 NE  AT 1:46 A.M.
DAVIS…………………..19 NNE AT 1:45 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………13 NNE AT 1:45 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………14 NNE AT 2:38 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..13 NNE AT 1:45 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..6.6 NE
ASOS…………………..6.9
DAVIS………………….5.4 NNE [026 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…Trace  DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.35  DEPARTURE……+0.22
ASOS…………..3.36
TOTAL PRECIPITATION FOR THE YEAR……….34.72  DEPARTURE……+4.62
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

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

7/1  85/67/76/+6/T/439/48                  35 S   AERO 37 S   RMY 38
7/2  87/69/78/+8/T/785/86                  25 W*  AERO 28 W*  RMY 27
7/3  85/67/76/+5/0.00/894/98               28 W*  AERO 29 W   RMY 30
7/4  84/62/73/+2/0.00/783/86               17 W   AERO 17 W   RMY 18
7/5  82/62/72/+1/0.00/855/94               20 S   AERO 20 ENE RMY 20
7/6  82/60/71/+0/0.00/664/73               21 SSW AERO 22 SSW RMY 21
7/7  71/60/66/-5/0.63/000/00               28 ENE AERO 28 ENE RMY 27
7/8  84/61/73/+1/0.15/463/51               30 SW* AERO 32 SSW RMY 33  TSTM
7/9  81/60/71/-1/0.00/897/99               26 W   AERO 26 W   RMY 26
7/10 85/63/74/+2/T/751/83                  25 SW  AERO 25 S   RMY 26
7/11 82/66/74/+2/0.25/253/28               24 S   AERO 24 S   RMY N/A
7/12 85/68/77/+5/0.43/325/36               23 NE  AERO 22 NE  RMY 23  TSTM
7/13 68/55/62/-10/0.03/000/00              28 NNE AERO 28 NE  RMY 29
7/14 63/56/60/-12/0.02/000/00              15 E   AERO 14 E   RMY 14
7/15 80/60/70/-2/0.00/296/33               18 S   AERO 16 S   RMY 18
7/16 87/64/76/+4/0.00/852/95               18 SSE AERO 16 E   RMY 17
7/17 84/68/76/+4/0.00/680/76               25 S   AERO 25 S*  RMY 25
7/18 85/68/77/+5/0.07/500/56               23 S   AERO 23 S   RMY 23
7/19 90/70/80/+8/0.00/794/89               22 SW  AERO 22 SW* RMY 22
7/20 90/70/80/+8/0.00/623/70               21 WSW AERO 22 WSW RMY 21
7/21 90/68/79/+7/0.00/…/..               26 W   AERO 26 W   RMY 27
7/22 87/70/79/+7/T/…/..                  20 WNW AERO 20 WNW RMY N/A
7/23 72/61/67/-5/T/…/..                  33 NE  AERO 32 NE  RMY 33
7/24 62/54/58/-14/1.74/…/..              38 NE  AERO 37 ENE RMY 38
7/25 63/54/59/-13/0.03/…/..              23 NNE AERO 21 NNE RMY N/A

7/26 Low temp since midnight is 55F; normal low is now 63F

DAILY RECORDS FOR JULY

7/24/17: DAILY RECORD LOW MAXIMUM TEMPERATURE OF 62F,
TIES PREVIOUS RECORD SET IN 1904 AND TIED IN 1964

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: Cecilia Borries-Strigle