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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JULY 19, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME
 
CLOUDY EARLY, THEN CLEAR, HOT AND HUMID
 
A cloudy and hazy start to the morning left very low visibility for the 7
AM observation.  Skies cleared for the rest of the morning and early
afternoon but had clouded over again by the 1 o'clock observation. 
Before the clouds, temperatures had climbed as high as 88 degrees
according to our readings and dew points were remaining at or around
70 degrees. 
 
Winds have been generally light but have begun to increase near the 1
o'clock observation with wind recorders detecting gusts near 20 mph. 

 
Today's Observations:

7 A.M.
Weather: Scattered cumulus, broken cirrostratus, hazy
Temperature: 74F; Dew Point: 70F; Wind: SW at 5 kts
Wind: Light
Sea-level pressure: 29.87 ins. Hg, falling
Visibility: 10 miles, visibility southeast 20
6-hr Max temp: 74F
6-hr Min temp: 68F
24-hr precip: T
BHO SA 1155 10 SCT E250 BKN 10 117/74/70/2305/987/ VSBY SE 20 HAZY
8/0/48/ 53005 10074 20068

10 A.M.
Weather: Scattered Cumulus, Scattered Altocumulus,Few Cirrus, Few Cirrostratus
light distant haze
Temperature: 83F; Dew Point 70F; Wind: Variable at 4 kts
Wind: Light and Variable
Sea-level pressure: 29.85 ins. Hg, steady then falling
Visibility: 50 miles, visibility SE-SW 20 miles
BHO SA 1455 30 SCT 40 SCT 50 109/83/70/VRB04/985/ VSBY SE-SW 20
LGT DSNT HZ FEW CI ALQDS FEW CS E-SW 8/185 56008
 
1 P.M.
Weather: Scattered cumulus, broken altocumulus, Few cirrus visible
E-SE, light distant haze
Temperature: 84F; Dew Point: 70F; Wind: SSW at 08 kts,
Sea-level pressure: 29.81 ins. Hg, falling then rising
Visibility: 35 miles
6-hr Max temp: 86F
6-hr Min temp: 74F
BHO SA 1755 40 SCT E150 BKN 35 096/86/70/2108/981/ LGT DSNT HZ FEW
CI E-SE 8/134 56013 10086 20074
 
SUMMARY FOR SATURDAY, JULY 18, 2015
  
TEMPERATURE (DEGREES F)
MAX.....76   NORMAL.....81
MIN.....63   NORMAL.....63
MEAN....70   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL........................-2
TOTAL DEPARTURE FOR THE MONTH........................-1 [-0.3 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............5   DEPARTURE..........-3
TOTAL COOLING UNITS FOR THE MONTH.............117   DEPARTURE..........-5
TOTAL COOLING UNITS FOR THE SEASON............255   DEPARTURE..........+4
TOTAL COOLING UNITS LAST SEASON TO DATE.......262   DIFFERENCE.........-7

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...................29   SSW AT  1:33 P.M.  
                   ASOS........................30   SSW AT  1:34 P.M.
                   DAVIS.......................30   SSW AT  1:33 P.M.  RMY 30
FASTEST MILE FOR YESTERDAY.....................21   SSW AT  1:32 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................22   SSW AT  1:35 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................22   SSW AT  1:35 P.M.
AVERAGE WIND SPEED AND DIRECTION..............14.0 SSW
                   ASOS.......................14.1
                   DAVIS......................12.9 SSW  [197 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...........2.98  DEPARTURE.....+0.78
                         ASOS...............3.01
TOTAL PRECIPITATION FOR THE YEAR...........27.25  DEPARTURE.....-1.92
                        ASOS...............N/A ***
*** ASOS annual total not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR JULY CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY 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  80/63/72/+2/0.59/466/51               30 SSE RMY 33  TSTM
7/2  78/60/69/-1/0.00/721/79               23 WNW RMY N/A
7/3  79/58/69/-2/0.00/867/95               17 SSW RMY 17
7/4  74/61/68/-3/T/109/12                  16 S   RMY N/A
7/5  82/58/70/-1/0.00/865/95               20 WSW RMY 20 
7/6  85/64/75/+4/0.00/755/83               20 S   RMY 21
7/7  84/65/75/+4/0.02/445/49               35 S   RMY 40
7/8  87/68/78/+6/T/372/41                  23 NE  RMY N/A
7/9  73/61/67/-5/..../390/43               24 NE  RMY 25
7/10 80/59/70/-2/..../535/59               18 W   RMY N/A TSTM
7/11 84/61/73/+1/0.00/868/96               21 NW  RMY 19
7/12 88/67/78/+6/0.00/813/90               20 W   RMY 17
7/13 82/66/74/+2/0.00/424/47               21 E   RMY 20
7/14 81/64/73/+1/..../396/44               25 S   RMY 27
7/15 84/61/73/+1/..../.../..               24 ENE RMY 26
7/16 72/56/64/-8/0.00/.../..               25 NNE RMY 24
7/17 79/56/68/-4/0.00/.../..               21 S   RMY N/A
7/18 76/63/70/-2/0.16/.../..               29 SSW RMY 30  TSTM
 
7/19 low since midnight is 65F; normal low is now 63F

DAILY RECORDS FOR JULY 2015
 
7/10- NEW RECORD DAILY PRECIPITATION PENDING OF X.XX in 2015
surpasses previous record of 1.68 in. in 1933

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: Robert Millette