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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JULY 27, 2016 
ALL TIMES ARE IN EASTERN STANDARD TIME

90-DEGREE TEMPERATURES PERSIST

The heat wave continues into its sixth day.  Temperatures again reached above 
90F with a max. temp. at the 1:00PM EST observation of 91F.  July 2016 now has
10 90-Degree Days, tied for second only to 14 days in July 1952.

Winds remained light and out of the W-NW.  Skies were partly cloudy starting
in the late afternoon as diurnal cumulus began forming.

BHO Longest Heat Waves (Consecutive Days with Tmax 90F or more; 1885-2015):
1) 9 days, Aug 11-19, 2002
2) 8 days, Aug 10-17, 1944
3) 6 days, Aug 28-Sep 2, 1953 
   6 days, Jul 24-29, 1963
   6 days, Jul 16-21, 1977
   6 days, Jul 6-11, 1988
   6 days, Jul 16-21, 1991
   6 days, Jul 15-20, 2013
9) 5 days, Jul 2-6, 1911
   5 days, Jul 7-11, 1912
   5 days, Aug 25-29, 1948
   5 days, Aug 7-11, 1949
   5 days, Jul 15-19, 1982 
   5 days, Jul 14-18, 2012

BHO July Greatest Number of 90-Degree Days (1885-2015):
1) 14 in 1952
2) 10 in 1949
   10 in 1963
   10 in 2010
   10 in 2013
6) 9 in 1911
7) 8 in 1983
   8 in 1988

Today's Observations:

7 A.M. 
Weather: Few altocumulus ESE-SW, few cirrus NNE-ENE
Temperature: 76F; Dew Point: 60F; Wind: NNW at 4 kts,
Wind Speed: Light
Sea-level pressure: 29.94 ins. Hg, rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 76F 
6-hr Min temp: 68F
24-hr precip: 0.00 in.
BHO SA 1155 CLR 70 139/76/60/3304/994/ FEW AC ESE-SW FEW CI NNE-ENE WND LGT/
8/031 51009 10076 20068

10 A.M.
Weather: Few cirrus ESE-S, scattered cumulus
Temperature: 85F; Dew Point: 57F; Wind: NW at 8G14 kts
Sea-level pressure: 29.93 ins. Hg, rising, then falling
Visibility: 70 miles
BHO SA 1455 59 SCT 70 136/85/57/3108G14/993/ FEW CI ESE-S/ 8/101 58003

1 P.M.
Weather: Scattered cumulus
Temperature: 90F; Dew Point: 58F; Wind: WSW at 8G13 kts
Sea-level pressure: 29.91 ins. Hg, falling, then more quickly
Visibility: 70 miles
6-hr Max temp: 91F 
6-hr Min temp: 75F
BHO SA 1755 44 SCT 70 128/90/58/2408G13/991/ 8/100 58008 10091 20075

SUMMARY FOR TUESDAY, JULY 26, 2016 
 
TEMPERATURE (DEGREES F)
MAX.....95   NORMAL.....81
MIN.....70   NORMAL.....63 
MEAN....83   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL........................+11
TOTAL DEPARTURE FOR THE MONTH........................+78 [+2.8 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............18   DEPARTURE.........+10
TOTAL COOLING UNITS FOR THE MONTH.............261   DEPARTURE.........+76
TOTAL COOLING UNITS FOR THE SEASON............418   DEPARTURE........+104
TOTAL COOLING UNITS LAST SEASON TO DATE.......324   DIFFERENCE........+94   

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................26  W    AT  11:19 A.M. 
                   AEROVANE....................26  WNW  AT  11:24 A.M.*        
                   ASOS........................27  W    AT  11:20 A.M.       
                   DAVIS.......................25  WNW  AT   8:51 A.M.  RMY 27
FASTEST MILE FOR YESTERDAY.....................18  W    AT  11:07 A.M.  
MAXIMUM 2-MINUTE ASOS AVERAGE..................18  WNW  AT  10:21 A.M.       
MAXIMUM 2-MINUTE DAVIS AVERAGE.................17  WNW  AT   9:52 A.M.       
AVERAGE WIND SPEED AND DIRECTION...............11.5 WNW
                   ASOS.......................11.2 
                   DAVIS.......................9.7 WNW [290 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..........0.79  DEPARTURE......-2.48
                         ASOS..............0.74
TOTAL PRECIPITATION FOR THE YEAR..........22.48  DEPARTURE......-7.76
                         ASOS.............22.86
 
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 TSTM
7/18 93/70/82/+10/0.05/.../..                41 WNW AERO 41 WNW RMY 43 TSTM
7/19 85/62/74/+2/0.00/.../..                 28 NW  AERO 28 NW  RMY 27
7/20 83/59/71/-1/0.00/.../..                 23 NW  AERO 23 NW* RMY 24
7/21 89/63/76/+4/0.00/.../..                 28 W   AERO 26 W   RMY N/A
7/22 96/70/83/+11/0.09/.../..                33 SW  AERO 35 SW  RMY 35 TSTM   
7/23 95/68/82/+10/T/.../..                   45 NNW AERO 48 NNW RMY 44
7/24 91/64/78/+6/0.00/.../..                 20 WNW AERO 20 W*  RMY 20 
7/25 96/70/83/+11/0.00/.../..                25 S   AERO 28 S   RMY 27
7/26 95/70/83/+11/0.00/.../..                26 W   AERO 26 WNW*RMY 27   

7/27 Low temp since midnight is 70F; normal low is now 68F

DAILY RECORDS FOR JULY 2016
7/25/16: NEW DAILY RECORD MAXIMUM TEMPERATURE OF 96F,
BREAKS PREVIOUS RECORD OF 94F SET IN 1963 AND 1987
     
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated): 

RECORDS FOR JULY 27
HIGH 95F IN 1949, 1963
LOW 50F IN 1920, 2001
PRE 4.01 INS IN 1979
WIND 47 MPH ENE IN 1984

RECORDS FOR JULY 28
HIGH 97F IN 1931
LOW 49F IN 1903
PRECIP 3.32 INS IN 1911
PEAK GUST 62 MPH SW IN 2006

TODAY'S REPORT PREPARED BY: Cecilia Borries-Strigle and Lizzy Suzedell