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

DAILY DISCUSSION AND CLIMATE SUMMARIES
WEDNESDAY, JULY 13, 2016 
ALL TIMES ARE IN EASTERN STANDARD TIME

HUMIDITY INCREASES, DISTANT HAZE PERSISTS

It was another warm and sunny day on top of Great Blue Hill.
Temperatures rose to 89F by 1:00PM EST, and dew points increased 
into the upper 60s.  An overnight low of 64F has made the average
temperature so far today 5F warmer than average.

Persistent haze during each observation limited visibility to just 40
miles.  Skies were mostly clear in the morning, but cumulus started 
forming in the early afternoon.  

Today's Observations:

7 A.M. 
Weather: Few distant altocumulus E-SSW, few cirrus E and S-SW
Temperature: 71F; Dew Point: 65F; Wind: SSW at 10 kts 
Sea-level pressure: 30.06 ins. Hg, steady, then falling
Visibility: 40 miles, distant haze
6-hr Max temp: 71F 
6-hr Min temp: 64F
24-hr precip: 0.00 in.
BHO SA 1155 CLR 40 179/71/65/2110/006/ FEW AC DSNT E-SSW FEW CI E AND S-SW 
DSNT HZ/ 8/031 55002 10071 20064

10 A.M.
Weather: Few cumulus SE-SW
Temperature: 83F; Dew Point: 66F; Wind: S at 9 kts
Sea-level pressure: 30.06 ins. Hg, rising, then falling
Visibility: 40 miles, distant haze
BHO SA 1455 CLR 40 179/83/66/1909/006/ FEW CU SE-SW DSNT HZ/ 8/100 51000

1 P.M.
Weather: Scattered cumulus
Temperature: 87F; Dew Point: 67F; Wind: SSW at 14G20 kts
Sea-level pressure: 30.03 ins. Hg, falling, then more quickly
Visibility: 40 miles, distant haze
6-hr Max temp: 89F 
6-hr Min temp: 71F
BHO SA 1755 60 SCT 40 169/87/67/2014G20/003/ DSNT HZ/ 8/100 57010
10089 20071
 
SUMMARY FOR TUESDAY, JULY 12, 2016 
 
TEMPERATURE (DEGREES F)
MAX.....86   NORMAL.....81
MIN.....60   NORMAL.....63 
MEAN....73   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL........................+1
TOTAL DEPARTURE FOR THE MONTH.......................-19 [-1.4 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............8   DEPARTURE..........+1
TOTAL COOLING UNITS FOR THE MONTH..............66   DEPARTURE.........-12
TOTAL COOLING UNITS FOR THE SEASON............223   DEPARTURE.........+16
TOTAL COOLING UNITS LAST SEASON TO DATE.......222   DIFFERENCE.........+1   

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................23 S    AT  7:44 P.M. 
                   ASOS........................24 SSW  AT  7:44 P.M.      
                   DAVIS.......................23 SSW  AT  7:44 P.M. RMY 23
FASTEST MILE FOR YESTERDAY.....................15 W    AT  4:12 P.M.*  
MAXIMUM 2-MINUTE ASOS AVERAGE..................16 W    AT  4:14 P.M.       
MAXIMUM 2-MINUTE DAVIS AVERAGE.................15 SSW  AT 12:42 P.M.      
AVERAGE WIND SPEED AND DIRECTION..............9.6 W
                   ASOS......................10.0
                   DAVIS......................8.7 WSW [240 Deg.]
*Last of several occurrences

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..........0.64  DEPARTURE......-0.74
                         ASOS..............0.60
TOTAL PRECIPITATION FOR THE YEAR..........22.33  DEPARTURE......-6.02
                         ASOS.............22.72
 
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
                                     
7/1  84/67/76/+6/0.20/520/57                 32 S   AERO 35 S   RMY 34 TSTM 
7/2  76/61/69/-1/0.00/811/91                 31 W   AERO 34 W   RMY 32 
7/3  83/57/70/-1/0.00/766/84                 23 W   AERO 23 W   RMY 23
7/4  87/61/74/+3/0.00/847/93                 28 SSW AERO 28 SSW RMY 28
7/5  80/65/73/+2/0.29/309/34                 16 S   AERO 16 S   RMY N/A
7/6  92/68/80/+9/0.00/864/95                 22 WSW AERO 24 WSW RMY 22
7/7  77/61/69/-2/0.00/.../..                 21 NE  AERO 20 ENE RMY N/A
7/8  67/58/63/-9/0.02/000/00                 25 NE  AERO 25 NE  RMY 26 
7/9  64/57/61/-11/0.09/000/00                20 NE  AERO 18 NE  RMY 17
7/10 66/56/61/-11/0.04/.../..                16 NE  AERO 16 NE  RMY 16
7/11 77/56/67/-5/0.00/.../..                 20 NNE AERO 21 NNE RMY 20
7/12 86/60/73/+1/0.00/.../..                 23 S   AERO 23 S   RMY 23

7/13 low temp since midnight is 64F; normal low is now 63F

DAILY RECORDS FOR JULY 2016
None so far.
     
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated): 

RECORDS FOR JULY 13
HIGH 95F IN 1894
LOW 52F IN 1888, 1895, 1939, 1973
PRECIP 3.54 INS IN 1996
WIND 55 MPH SE IN 1996

RECORDS FOR JULY 14
HIGH 98F IN 1952
LOW 51F IN 1895, 1937
PRECIP 1.97 INS IN 1960
WIND 110e MPH NW IN 1942 [RECORD FOR MONTH]

TODAY'S REPORT PREPARED BY: Cecilia Borries-Strigle