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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JULY 5, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME
 
EXCELLENT WEATHER TODAY WITH CLEAR SKIES AND WARM TEMPERATURES
 
It was a cool start here at the summit, with a morning low of 58F, but it has
turned into a stellar summer day.  Full sunshine has allowed the temperature
to warm into the low 80s this afternoon, close to average for this time of
year.  Winds have been very light from the NW, with visibility around 30 miles
with some haze.  A couple light rain showers were observed yesterday afternoon,
providing just a trace of rainfall. 
 
PRELIMINARY STATS FOR JUNE 2015
 
TEMPERATURE, Deg. F
Avg. Max. 72.9 [-2.1]
Avg. Min. 55.8 [-1.3]
Mean      64.4 [-1.7]
Corrected mean: 63.9
Max. for month: 86 on 6/12
Min. for month: 44 on 6/2 and 6/3
 
HEATING DEGREE DAYS
Total heating units: 101 [+28]
Total for the season: 6505 [+129]
Total for last season: 6422
 
COOLING DEGREE DAYS
Total cooling units: 89 [-16]
Total for the season: 138 [+9]
Total for last season: 109
 
PRECIPITATION, Inches
Total: 4.90 [+0.59]
Greatest in 24 hrs: N/A
 
WIND, mph
Avg. uncorrected wind speed: 10.4
Avg. corrected wind speed: 10.9
Prevailing wind direction: S @ 12%
Peak gust and direction: 41 SSW on the 8th
 
SUNSHINE:
Astronomical total minutes:  12,941 out of 27,416 possible, or 47%
Campbell-Stokes card minutes: 12,450 out of 26,376 possible, or 47%

Today's Observations:

7 A.M.
Weather: Clear (SKC)
Temperature: 64F; Dew Point: 59F; Wind: W at 7 kts
Sea-level pressure: 30.07 ins. Hg, rising then rising more rapidly
Visibility: 30 miles, distant haze
6-hr Max temp: 64F
6-hr Min temp: 58F
24-hr precip: Trace
BHO SA 1155 CLR 30 184/64/59/2807/007/ SKC DSNT HZ/ 8/000 53017
MANUAL 7000/ 10064 20058
 
10 A.M.
Weather: Clear, few small cumulus SSW-SW
Temperature: 76F; Dew Point: 61F; Wind: estimated WNW at 5 kts,
Wind: Light and variable
Sea-level pressure: 30.10 ins. Hg, rising then rising more slowly
Visibility: 35 miles, distant haze
BHO SA 1455 CLR 35 192/76/61/E3005/010/ FEW SML CU SSW-SW
DSNT HZ WND L/V/ 8/100 51008
 
1 P.M.
Weather: Clear, few cumulus all quadrants, few moderate cumulus S
Temperature: 81F; Dew Point: 61F; Wind: estimated NW at 5 kts,
Wind: Light and variable
Sea-level pressure: 30.10 ins. Hg, rising then falling, same as 3 hours ago
Visibility: 30 miles, distant haze
6-hr Max temp: 81F
6-hr Min temp: 64F
BHO SA 1755 CLR 30 192/81/61/E3305/010/ FEW CU ALQDS FEW MDT CU S
DSNT HZ WND L/V/ 8/200 50000 10081 20064
 
SUMMARY FOR SATURDAY, JULY 4, 2015 INDEPENDENCE DAY
 
TEMPERATURE (DEGREES F)
MAX.....74   NORMAL.....80
MIN.....61   NORMAL.....62
MEAN....68   NORMAL.....71

DEPARTURE FROM 30-YEAR NORMAL........................-3
TOTAL DEPARTURE FOR THE MONTH........................-4 [-1.2 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............3   DEPARTURE..........-3
TOTAL COOLING UNITS FOR THE MONTH..............18   DEPARTURE..........-6
TOTAL COOLING UNITS FOR THE SEASON............156   DEPARTURE..........+3
TOTAL COOLING UNITS LAST SEASON TO DATE.......151   DIFFERENCE.........+5

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...................16  S  AT   1:37 A.M.               
                   ASOS........................16  S  AT   1:37 A.M.
                   DAVIS.......................15  S  AT   1:37 A.M.  RMY N/A
FASTEST MILE FOR YESTERDAY.....................12  S  AT   1:46 A.M.          
MAXIMUM 2-MINUTE ASOS AVERAGE..................13  S  AT   1:51 A.M.                
MAXIMUM 2-MINUTE DAVIS AVERAGE.................11  S  AT   1:39 A.M.        
AVERAGE WIND SPEED AND DIRECTION............. .5.6 S
                   ASOS........................5.8
                   DAVIS.......................4.8 S [193 deg.]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....Trace  DEPARTURE.....-0.10
                         ASOS...............0.00
TOTAL PRECIPITATION FOR THE MONTH...........0.59  DEPARTURE.....+0.16
                         ASOS...............0.60
TOTAL PRECIPITATION FOR THE YEAR.......... 24.86   DEPARTURE....-2.41
                         ASOS...............N/A ***
 
*** ASOS annual totals not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR JUNE 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
 
6/1  48/46/47/-15/0.69/000/00              32 NE  RMY 34
6/2  47/44/46/-16/0.78/000/00              28 NNE RMY 28
6/3  59/44/52/-10/0.00/172/19              16 ESE RMY 16
6/4  63/46/55/-8/0.00/445/49               17 E   RMY 16
6/5  70/49/60/-3/T/500/55                  17 NNE RMY 17
6/6  65/52/59/-4/0.06/382/42               26 ENE RMY 27
6/7  73/49/61/-3/0.00/884/97               28 S   RMY 29
6/8  73/50/62/-2/T/310/34                  41 SSW RMY 48
6/9  76/61/69/+4/0.03/228/25               29 SSW RMY 32 
6/10 82/57/70/+5/0.00/840/92               24 WSW RMY N/A 
6/11 85/61/73/+8/0.00/594/65               29 SSW RMY 32
6/12 86/65/76/+11/0.00/522/57              26 S   RMY 29
6/13 83/67/75/+10/T/586/64                 24 N   RMY 27
6/14 75/61/68/+2/0.00/641/70               21 SSE RMY 21
6/15 61/52/57/-9/0.60/000/00               25 SE  RMY 26
6/16 73/56/65/-1/..../009/01               18 NW  RMY N/A
6/17 70/57/64/-3/0.00/605/66               28 NE  RMY 28
6/18 76/54/65/-2/0.00/669/73               22 S   RMY 26
6/19 84/60/72/+5/T/642/70                  24 SSW RMY 22
6/20 75/56/66/-2/..../559/61               23 SSE RMY N/A
6/21 76/60/68/0/..../202/22                26 S   RMY 29
6/22 83/63/73/+5/0.00/770/84               20 WNW RMY 19
6/23 85/67/76/+8/0.01/284/31               36 S   RMY 38
6/24 82/62/72/+3/0.00/899/98               25 WNW RMY 27
6/25 80/60/70/+1/0.00/605/66               21 W   RMY N/A
6/26 72/58/65/-4/0.01/540/59               23 NNE RMY 21
6/27 73/56/65/-4/..../202/22               32 ESE RMY N/A
6/28 59/50/55/-15/..../000/00              39 ENE RMY 38
6/29 71/50/61/-9/..../110/12               17 SSW RMY 18
6/30 81/60/71/+1/T/741/81                  21 S   RMY N/A
 
7/1  80/63/72/+2/0.59/.../..               30 SSE RMY 33  TSTM
7/2  78/60/69/-1/0.00/.../..               23 WNW RMY N/A
7/3  79/58/69/-2/0.00/.../..               17 SSW RMY 17
7/4  74/61/68/-3/T/.../..                  16 S   RMY N/A
 
7/5 low since midnight is 61F; normal low is now 62F

DAILY RECORDS FOR JUNE AND JULY 2015
 
6/1- NEW RECORD LOW MAXIMUM TEMPERATURE OF 48F
surpasses previous record of 51F in 2004

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JULY 5
HIGH 98F IN 1911
LOW 48F IN 1920, 1927 & 1979
PRECIP 1.45 INS IN 1922
PEAK GUST 44e N IN 1944
 
RECORDS FOR JULY 6
HIGH 99F IN 2010
LOW 47F IN 1979
PRECIP 1.43 INS IN 2005
PEAK GUST 56e MPH NNW IN 1942, 56 MPH WNW IN 1999
 
TODAY'S REPORT PREPARED BY: Jonathan O'Brien