BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARIES
SATURDAY, JULY 16, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME
 
HOTTEST DAY OF THE YEAR SO FAR YESTERDAY
HOT AGAIN TODAY BUT LESS HUMID
 
Yesterday featured the warmest temperatures of the year so far, with the high
of 93F just one degree short of tying the daily record.  The low of 71F was
the first low of the season to remain over 70F.  Some showers and storms
developed southeast of the Observatory in the afternoon, but no rainfall
was recorded here.
 
Hot weather has continued today, with a high temperature so far of 91F.  Dew
points are lower today than yesterday, however, only in the mid to upper 50s
for most of the day, with relative humidity values dropping to near 30%.  In
addition, a steady 10-15mph SW breeze established itself by late morning,
with gusts over 20mph, making the heat a little more bearable.  Visibility
has also been better, at or just above 60 miles all day.
 
Today's Observations:
 
7 A.M.
Weather: Scattered cirrus, few cirrocumulus mostly SE-SW
Temperature: 76F; Dew Point: 62F; Wind: WNW at 7 kts
Sea-level pressure: 30.01 ins. Hg, rising then rising more rapidly
Visibility: 65 miles, light distant haze
6-hr Max temp: 73F
6-hr Min temp: 69F
24-hr precip: 0.00 in.
BHO SA 1155 250 SCT 65 164/76/62/2907/001/ FEW CC MSTLY SE-SW
LGT DSNT HZ/ 8/001 53025 10073 20069
 
10 A.M.
Weather: Scattered cirrus, few cumulus distant S and W-N, few lower cirrus
Temperature: 84F; Dew Point: 59F; Wind: SW at 8 kts,
Wind: Direction variable S-WNW
Sea-level pressure: 30.04 ins. Hg, rising then rising more rapidly
Visibility: 60 miles, light distant haze
BHO SA 1455 250 SCT 60 172/84/59/2308/004/ FEW CU DSNT S AND W-N
FEW LWR CI LGT DSNT HZ WND 18V29/ 8/101 53008
 
1 P.M.
Weather: Scattered cumulus, scattered cirrus
Temperature: 90F; Dew Point: 57F; Wind: W at 10 kts,
Wind: Direction variable SW-NW
Sea-level pressure: 30.03 ins. Hg, rising then falling
Visibility: 65 miles, light distant haze
6-hr Max temp: 91F
6-hr Min temp: 76F
BHO SA 1755 65 SCT 250 SCT 65 170/90/57/2710/003/ LGT DSNT HZ
WND 23V31/ 8/101 58002 10091 20076
 
SUMMARY FOR FRIDAY, JULY 15, 2016
 
TEMPERATURE (DEGREES F)
MAX.....93   NORMAL.....81
MIN.....71   NORMAL.....63
MEAN....82   NORMAL.....72
 
DEPARTURE FROM 30-YEAR NORMAL.......................+10
TOTAL DEPARTURE FOR THE MONTH........................-1 [-0.3 DEGREES/DAY]
 
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............17   DEPARTURE.........+10
TOTAL COOLING UNITS FOR THE MONTH.............105   DEPARTURE..........+5
TOTAL COOLING UNITS FOR THE SEASON............262   DEPARTURE.........+33
TOTAL COOLING UNITS LAST SEASON TO DATE.......247   DIFFERENCE........+15  
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...................23  W    AT  10:26 P.M.*
                   AEROVANE....................23  W    AT  10:26 P.M.*      
                   ASOS........................24  W    AT  10:26 P.M.     
                   DAVIS.......................22  WSW  AT   1:38 P.M. RMY 23
FASTEST MILE FOR YESTERDAY.....................18  S    AT   3:07 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE..................17  W    AT  10:27 P.M.      
MAXIMUM 2-MINUTE DAVIS AVERAGE.................17  S    AT   3:09 P.M.     
AVERAGE WIND SPEED AND DIRECTION..............9.8  SSW
                   ASOS.......................9.8
                   DAVIS......................8.9  SW [223 Deg.]
*Last of several occurrences
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.14
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........0.65  DEPARTURE......-1.15
                         ASOS..............0.61
TOTAL PRECIPITATION FOR THE YEAR..........22.34  DEPARTURE......-6.43
                         ASOS.............22.73

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/-2/0.00/409/45                 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/-11/0.04/000/00                16 NE  AERO 16 NE  RMY 16
7/11 77/56/67/-5/0.00/415/46                 20 NNE AERO 21 NNE RMY 20
7/12 86/60/73/+1/0.00/848/94                 23 S   AERO 23 S   RMY 23
7/13 89/64/77/+5/0.00/874/97                 30 S   AERO 30 S   RMY 33
7/14 84/66/75/+3/0.01/.../..                 38 S   AERO 41 S   RMY 43
7/15 93/71/82/+10/0.00/.../..                23 W   AERO 23 W   RMY 23
 
7/16 low temp since midnight is 69F; 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 16
HIGH 94F IN 1968, 1980, 1983, 1999
LOW 50F IN 1889, 1903
PRECIP 0.97 INS IN 2014
WIND 48e MPH SW 1944
 
RECORDS FOR JULY 17
HIGH 96F IN 1999
LOW 47F IN 1892
PRECIP 1.39 INS IN 1989
WIND 46 MPH WNW IN 1971
 
TODAY'S REPORT PREPARED BY: Jonathan O'Brien