Thursday, June 25, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JUNE 25, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

DRY, COMFORTABLE SUMMER CONDITIONS CONTINUE
AS CLOUDS BEGIN TO BUILD

Temperatures dipped to a comfortable and normal minimum
of 60F overnight. Cirrus and lower level clouds began to
build this morning ahead of possible showers later today.

By the 1:00 PM EST observation cirrostratus had begun to
invade the region with growing small cumulus becoming a
moderate size in a few spots. Light haze had reduced visibility
to 60 miles, with a maximum recorded temperature so far
of 80F.
Today’s Observations:

7 A.M.
Weather: Clear, altocumulus distant SSW and WNW, few
cirrus in all directions
Temperature: 68F; Dew Point: 55F; Wind: estimated WNW at 3 kts
Wind Speed: Light
Sea-level pressure: 30.04 ins. Hg, increasing unsteadily
Visibility: 70 miles, light distant haze
6-hr Max temp: 68F
6-hr Min temp: 60F
24-hr precip: none
BHO SA 1155 CLR 70 174/68/55/E3003/004/ FEW AC DSNT SSW AND WNW
FEW CI ALQDS LGT DSNT HZ ALQDS WND LGT/ 8/031 52009 10068 20060

10 A.M.
Weather: Clear, few cumulus in all directions, few
cirrocumulus distant SW-WSW, few cirrus in all directions
Temperature: 75F; Dew Point: 54F; Wind: estimated NW at 2 kts
Wind Speed and Direction: Light and Variable
Sea-level pressure: 30.04 ins. Hg, about the same
Visibility: 70 miles, light distant haze
BHO SA 1455 CLR 70 174/75/54/E3202/004/ FEW CU ALQDS FEW CC DSNT
SW-WSW FEW CI DSNT ALQDS LGT DSNT HZ ALQDS WND LGT AND VRB/
8/101 58000

1 P.M.
Weather: Scattered cumulus, broken cirrostratus
Temperature: 79F; Dew Point: 55F; Wind: estimated WSW at 6 kts
Wind Speed and Direction: Light and Variable
Sea-level pressure: 29.99 ins. Hg, steady, then falling
Visibility: 60 miles, light distant haze
6-hr Max temp: 79F
6-hr Min temp: 68F
BHO SA 1755 90 SCT E250 BKN 60 155/79/55/E2506/999/
LGT DSNT HZ ALQDS WND LGT AND VRB/ 8/106 58019 10079 20068
SUMMARY FOR WEDNESDAY, JUNE 24, 2015

TEMPERATURE (DEGREES F)
MAX…..82   NORMAL…..78
MIN…..62   NORMAL…..60
MEAN….72   NORMAL…..69

DEPARTURE FROM 30-YEAR NORMAL……………………+3
TOTAL DEPARTURE FOR THE MONTH…………………..-16 [-0.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0  DEPARTURE………..-1
TOTAL HEATING UNITS FOR THE MONTH…………..87  DEPARTURE……….+18
TOTAL HEATING UNITS FOR THE SEASON………..6491  DEPARTURE………+120
TOTAL HEATING UNITS LAST SEASON TO DATE……6422  DIFFERENCE………+69

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………7   DEPARTURE……….+2
TOTAL COOLING UNITS FOR THE MONTH…………..78   DEPARTURE……….+5
TOTAL COOLING UNITS FOR THE SEASON…………127   DEPARTURE………+30
TOTAL COOLING UNITS LAST SEASON TO DATE……..72   DIFFERENCE……..+55

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….25 WNW  AT   7:34 A.M.
ASOS……………………27 NW   AT   7:34 A.M.
DAVIS…………………..26 WNW  AT   7:34 A.M. RMY 27
FASTEST MILE FOR YESTERDAY…………………17 WNW  AT   7:33 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………20 WNW  AT   7:34 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..18 WNW  AT   7:34 A.M.
AVERAGE WIND SPEED AND DIRECTION………….11.0 WNW
ASOS………………….11.2
DAVIS………………….9.2 WNW [302 deg.] * Last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.00   DEPARTURE….-0.12
ASOS……………0.00
TOTAL PRECIPITATION FOR THE MONTH………..3.38   DEPARTURE….-0.24
ASOS……………3.39
TOTAL PRECIPITATION FOR THE YEAR………. 22.75   DEPARTURE….-3.40
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/…./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/…./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/…./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/…/..               28 NE  RMY 28
6/18 76/54/65/-2/0.00/…/..               22 S   RMY 26
6/19 84/60/72/+5/T/…/..                  24 SSW RMY 22
6/20 75/56/66/-2/…./…/..               23 SSE RMY N/A
6/21 76/60/68/0/…./…/..                26 S   RMY 29
6/22 83/63/73/+5/0.00/…/..               20 WNW RMY 19
6/23 85/67/76/+8/0.01/…/..               36 S   RMY 38
6/24 82/62/72/+3/0.00/…/..               25 WNW RMY 27

6/25 low since midnight is 60F; normal low is now 60F

DAILY RECORDS FOR JUNE 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 JUNE 25
HIGH 93F IN 1943,1980, 2005
LOW 47F IN 1903
PRECIP 1.38 INS IN 2012
PEAK GUST 51 MPH W IN 1960

RECORDS FOR JUNE 26
HIGH 96F IN 1952
LOW 45F IN 1986
PRECIP 1.52 INS IN 1945
PEAK GUST 48 MPH N IN 1998

TODAY’S REPORT PREPARED BY: Brian Fitzgerald