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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JULY 19, 2016 
ALL TIMES ARE IN EASTERN STANDARD TIME

MUCH DRIER AND COOLER CONDITIONS AFTER COLD FRONT PASSES

An approaching cold front riddled the area with isolated thunderstorms
yesterday afternoon.  The observatory measured 0.05 in. of precipitation
from a brief rain shower.

Drier conditions prevailed today with dew points in the upper 50s.
Temperatures were also cooler than previous days.  The max. temperature
by the 1:00PM EST observation was 85F but had cooled to 80F due to 
increasing cloud cover. Skies were broken with altocumulus and cirrus at
the 1:00PM ob.

Today's Observations:

7 A.M. 
Weather: Scattered cirrus, few altocumulus NNW-N
Temperature: 74F; Dew Point: 60F; Wind: W at 11G18 kts
Sea-level pressure: 30.00 ins. Hg, rising, then less quickly
Visibility: 60 miles
6-hr Max temp: 74F 
6-hr Min temp: 70F
24-hr precip: 0.05 in.
BHO SA 1155 250 SCT 60 158/74/60/2711G18/000/ FEW AC NNW-N/ 
8/032 51009 ASOS 70005 MANUAL 70005 10074 20070

10 A.M.
Weather: Scattered cumulus, scattered cirrus
Temperature: 81F; Dew Point: 56F; Wind: WNW at 9G15 kts
Sea-level pressure: 30.02 ins. Hg, rising, then steady
Visibility: 70 miles
BHO SA 1455 49 SCT 250 SCT 70 165/81/56/3009G15/002/ 8/101 51007

1 P.M.
Weather: Broken altocumulus, broken cirrus
Temperature: 80F; Dew Point: 54F; Wind: NW at 10G18 kts
Sea-level pressure: 30.01 ins. Hg, rising, then falling
Visibility: 70 miles
6-hr Max temp: 85F 
6-hr Min temp: 73F
BHO SA 1755 E79 BKN 250 BKN 70 163/80/54/3210G18/001/ 
8/051 57002 10085 20073

SUMMARY FOR MONDAY, JULY 18, 2016 
 
TEMPERATURE (DEGREES F)
MAX.....93   NORMAL.....81
MIN.....70   NORMAL.....63 
MEAN....82   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL.......................+10
TOTAL DEPARTURE FOR THE MONTH.......................+24 [+1.1 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............17   DEPARTURE..........+9
TOTAL COOLING UNITS FOR THE MONTH.............151   DEPARTURE.........+29
TOTAL COOLING UNITS FOR THE SEASON............308   DEPARTURE.........+57
TOTAL COOLING UNITS LAST SEASON TO DATE.......254   DIFFERENCE........+54   

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................41 WNW  AT   3:38 P.M.
                   AEROVANE....................41 WNW  AT   3:35 P.M.       
                   ASOS........................45 NW   AT   3:37 P.M.      
                   DAVIS.......................38 WNW  AT   3:34 P.M. RMY 43
FASTEST MILE FOR YESTERDAY.....................34 WNW  AT   3:38 P.M.  
MAXIMUM 2-MINUTE ASOS AVERAGE..................33 NW   AT   3:38 P.M.       
MAXIMUM 2-MINUTE DAVIS AVERAGE.................31 WNW  AT   3:38 P.M.      
AVERAGE WIND SPEED AND DIRECTION.............13.4 SSW
                   ASOS......................13.4
                   DAVIS.....................12.2 SW [220 Deg.]
*Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.05  DEPARTURE......-0.08
                         ASOS..............0.05
TOTAL PRECIPITATION FOR THE MONTH..........0.70  DEPARTURE......-1.50
                         ASOS..............0.66
TOTAL PRECIPITATION FOR THE YEAR..........22.39  DEPARTURE......-6.78
                         ASOS.............22.78
 
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 93/70/82/+10/0.05/.../..                41 WNW AERO 41 WNW RMY 43

7/19 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 19
HIGH 96F IN 1977, 1991
LOW 50F IN 1890
PRECIP 1.10 INS IN 1951
WIND 63 MPH SSW IN 1982

RECORDS FOR JULY 20
HIGH 99F IN 1991
LOW 47F IN 1890
PRECIP 1.64 INS IN 1938
WIND 56e MPH SSW IN 1943

TODAY'S REPORT PREPARED BY: Cecilia Borries-Strigle