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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JULY 17, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

INCREASING CLOUDS, DEW POINTS HOLD STEADY

Today has been another warm, summer day.  Temperatures
had already reached 70F at the 7:00AM EST observation
and continued to climb to a maximum of 84F by 1:00PM.
Humidity remained at fairly comfortable levels with dew
points in the mid-60s all day.

Cloud cover increased with dense cirrus and cumulus clouds
through the early afternoon.  Winds have been out of the
south and southwest since midnight and have been slightly
higher than previous days.  With the southerly flow, slight
haze has kept visibility below 70 miles.


Today's Observations:

7 A.M.
Weather: Few altocumulus NE-SE and WSW-NNW, scattered cirrus
Temperature: 73F; Dew Point: 64F; Wind: SW at 4 kts,
Wind speed: Light
Sea-level pressure: 30.08 ins. Hg, rising steadily
Visibility: 40 miles, distant haze in all directions
6-hr Max temp: 73F
6-hr Min temp: 68F
24-hr precip: 0.00 in. 
BHO SA 1155 SCT 250 40 187/73/64/2204/008/ FEW AC NE-SE AND WNW-NNW
DSNT HZ ALQDS WND LGT/ 8/032 52015 10073 20068

10 A.M.
Weather: Few cumulus E-N, few altocumulus SSW and W-N, scattered cirrus
Temperature: 80F; Dew Point: 64F; Wind: S at 7 kts
Sea-level pressure: 30.10 ins. Hg, rising, then more slowly
Visibility: 50 miles
BHO SA 1455 250 SCT 50 193/80/64/1707/010/ FEW CU E-N FEW AC SSW AND W-N/
8/132 51006

1 P.M. 
Weather: Few cumulus in all directions, two layers of broken cirrus
Temperature: 81F; Dew Point: 65F; Wind: S at 8 kts
Sea-level pressure: 30.07 ins. Hg, falling, then more quickly
Visibility: 60 miles
6-hr Max temp: 84F
6-hr Min temp: 73F
BHO SA 1755 E200 BKN 250 BKN 60 184/81/65/1708/007/ FEW CU ALQDS/
8/104 58009 10084 20073


SUMMARY FOR SUNDAY, JULY 16, 2017
 
TEMPERATURE (DEGREES F)
MAX.....87   NORMAL.....81
MIN.....64   NORMAL.....63
MEAN....76   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL.........................+4
TOTAL DEPARTURE FOR THE MONTH.........................+6 [+2.4 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............11   DEPARTURE..........+4
TOTAL COOLING UNITS FOR THE MONTH.............117   DEPARTURE.........+10
TOTAL COOLING UNITS FOR THE SEASON............318   DEPARTURE.........+82
TOTAL COOLING UNITS LAST SEASON TO DATE.......278   DEPARTURE.........+40

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................18 SSE AT 7:28 P.M.
                   AERO........................16  E  AT 3:51 P.M.
                   ASOS........................18 SSE AT 7:27 P.M.
                   DAVIS.......................16 SSE AT 6:59 P.M. RMY 17
FASTEST MILE FOR YESTERDAY.....................13 SSE AT 7:26 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................13 SSE AT 7:37 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................12 SSE AT 7:28 P.M.
AVERAGE WIND SPEED AND DIRECTION..............7.3 WNW
                   ASOS.......................7.5
                   DAVIS......................5.7 SW [233 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..........1.51  DEPARTURE......-0.42
                         ASOS..............1.48
TOTAL PRECIPITATION FOR THE YEAR..........32.88  DEPARTURE......+3.98
                         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/.../..              15 E   AERO 14 E   RMY 14
7/15 80/60/70/-2/0.00/.../..               18 S   AERO 16 S   RMY 18
7/16 87/64/76/+4/0.00/.../..               18 SSE AERO 16 E   RMY 17

7/17 Low temp since midnight is 68F; normal low is now 63F


DAILY RECORDS FOR JULY

None so far.


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

RECORDS FOR JULY 17
HIGH 96F IN 1999
LOW 47F IN 1892
PRECIP 1.39 INS IN 1989
WIND 46 MPH WNW IN 1971

RECORDS FOR JULY 18
HIGH 96F IN 1991, 1999
LOW 54F IN 1892, 1956, 1971
PRECIP 1.65 INS IN 2000
WIND 43e MPH SW IN 1949

TODAY'S REPORT PREPARED BY: Cecilia Borries-Strigle