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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JULY 18, 2016 
ALL TIMES ARE IN EASTERN STANDARD TIME

CONTINUING THE TREND OF HOT AND HUMID, POSSIBLE THUNDERSTORMS
DUE TO INCOMING COLD FRONT 

Today continued the trend of hazy, hot, and humid conditions.  Visibility
remained 30-40 miles due to morning fog and then haze for the rest of the
day.  Temperatures reached a peak of 93F by 1:00PM EST but began slightly
decreasing shorty after the observation with the approaching cold front.
Dew points were in the 60s at each observation.

No precipitation had been measured by 1:00PM EST.  Winds remained out 
of the SSW with a peak wind of 35 MPH (30 kts) measured at 12:36 PM EST.

Today's Observations:

7 A.M. 
Weather: Scattered cirrostratus
Temperature: 77F; Dew Point: 63F; Wind: SSW at 12 kts
Sea-level pressure: 30.09 ins. Hg, rising, then falling
Visibility: 30 miles, except 40 miles WSW-NNE, distant fog
6-hr Max temp: 77F 
6-hr Min temp: 70F
24-hr precip: 0.00 in.
BHO SA 1155 200 SCT 30 188/77/63/2012/009/ VSBY WSW-NNE 40 
DSNT FG/ 8/008 58002 10077 20070

10 A.M.
Weather: Few cumulus in all directions, scattered cirrostratus
Temperature: 88F; Dew Point: 64F; Wind: SSW at 16G20 kts
Sea-level pressure: 30.04 ins. Hg, falling, then more slowly
Visibility: 40 miles, hazy
BHO SA 1455 200 SCT 40 174/88/64/2016G20/004/ FEW CU ALQDS HAZY/ 
8/108 56014

1 P.M.
Weather: Few cumulus in all directions, scattered cirrostratus, 
broken cirrus
Temperature: 93F; Dew Point: 62F; Wind: SSW at 18G26 kts,
Sea-level pressure: 29.98 ins. Hg, falling, then more quickly
Visibility: 35 miles,  hazy
6-hr Max temp: 93F 
6-hr Min temp: 77F
BHO SA 1755 200 SCT E320 BKN 35 151/93/62/2018G26/998/ FEW CU 
ALQDS HAZY PK WND 2030/36/ 8/051 58023 10093 20077

SUMMARY FOR SUNDAY, JULY 17, 2016 
 
TEMPERATURE (DEGREES F)
MAX.....83   NORMAL.....81
MIN.....72   NORMAL.....63 
MEAN....78   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL........................+6
TOTAL DEPARTURE FOR THE MONTH.......................+14 [+0.6 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............13   DEPARTURE..........+6
TOTAL COOLING UNITS FOR THE MONTH.............134   DEPARTURE.........+20
TOTAL COOLING UNITS FOR THE SEASON............291   DEPARTURE.........+48
TOTAL COOLING UNITS LAST SEASON TO DATE.......250   DIFFERENCE........+41   

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................18 ENE  AT   9:14 A.M.
                   AEROVANE....................16 ENE  AT   9:13 A.M.       
                   ASOS........................18 ENE  AT   9:14 A.M.      
                   DAVIS.......................16 ENE  AT   9:14 A.M. RMY 19
FASTEST MILE FOR YESTERDAY.....................11 SW   AT  11:11 P.M.  
MAXIMUM 2-MINUTE ASOS AVERAGE..................14 E    AT   9:24 A.M.       
MAXIMUM 2-MINUTE DAVIS AVERAGE.................12 ENE  AT   9:15 A.M.      
AVERAGE WIND SPEED AND DIRECTION..............7.1 ENE 
                   ASOS.......................7.4
                   DAVIS......................6.4 ESE [120 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......-1.42
                         ASOS..............0.61
TOTAL PRECIPITATION FOR THE YEAR..........22.34  DEPARTURE......-6.70
                         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 93/69/81/+9/0.00/.../..                 25 WSW AERO 24 WSW RMY 24
7/17 83/72/78/+6/0.00/.../..                 18 ENE AERO 16 ENE RMY 19

7/18 low temp since midnight is 70F; 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 18
HIGH 96F IN 1991, 1999
LOW 54F IN 1892, 1956, 1971
PRECIP 1.65 INS IN 2000
WIND 43e MPH SW IN 1949

RECORDS FOR JULY 19
HIGH 96F IN 1977, 1991
LOW 50F IN 1890
PRECIP 1.10 INS IN 1951
WIND 63 MPH SSW IN 1982

TODAY'S REPORT PREPARED BY: Cecilia Borries-Strigle