Tuesday, July 7, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JULY, 7 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

HUMIDITY ON THE RISE, DEW POINTS HIT THE LOWER 70S

Yesterday’s maximum temperature of 85F cooled
overnight to a low of 65F, with gradually rising
humidity. Thin fog and haze have kept visibility
reduced under 20 miles for a second consecutive day.

By the 1:00 PM EST observation hazy conditions were
still in place. A passing shower dropped 0.02 inches
of new rain, as very isolated showers have moved
through the region. A dew point of 70F was still present
at the observation, with a maximum temperature of 84F.
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: Scattered stratus fractus, broken stratocumulus
Temperature: 71F; Dew Point: 68F; Wind: SSE at 7 kts
Sea-level pressure: 30.13 ins. Hg, rising, then falling but still higher
Visibility: 10 miles, thin fog, hazy
6-hr Max temp: 71F
6-hr Min temp: 65F
24-hr precip: none
BHO SA 1155 7 SCT E26 BKN 10 203/71/68/1507/013/ THN FG ALQDS HAZY/
8/500 50001 10071 20065

10 A.M.
Weather: Scattered moderate cumulus, broken stratocumulus,
few stratus fractus in all directions, cumulus building
in all directions, showers distant NNE
Temperature: 79F; Dew Point: 70F; Wind: S at 7 kts
Sea-level pressure: 30.12 ins. Hg, falling, then more quickly
Visibility: 15 miles, hazy
BHO SA 1455 20 SCT E43 BKN 15 199/79/70/1707/012/ SHWRS DSNT NNE
FEW STFRA ALQDS MDT CU ALQDS CU BLDG ALQDS HAZY/ 8/200 58004

1 P.M.
Weather: Scattered cumulus, scattered stratocumulus,
few moderate cumulus
Temperature: 84F; Dew Point: 70F; Wind: S at 15 kts,
Sea-level pressure: 30.05 ins. Hg, falling, then more quickly
Visibility: 25 miles, hazy, except 15 miles NNE-NE
6-hr Max temp: 84F
6-hr Min temp: 71F
3-hr precip: 0.02 inches
BHO SA 1755 21 SCT 40 SCT 25 176/84/70/1915/005/ VSBY 15 MI NNE-NE
MDT CU NE HAZY/ 8/200 58023 ASOS 60001 MANUAL 60002 10084 20071
SUMMARY FOR TUESDAY, JULY 7, 2015

TEMPERATURE (DEGREES F)
MAX…..85   NORMAL…..80
MIN…..64   NORMAL…..62
MEAN….75   NORMAL…..71

DEPARTURE FROM 30-YEAR NORMAL……………………+4
TOTAL DEPARTURE FOR THE MONTH……………………-1 [-0.3 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..10   DEPARTURE……….+3
TOTAL COOLING UNITS FOR THE MONTH…………..33   DEPARTURE……….-4
TOTAL COOLING UNITS FOR THE SEASON…………171   DEPARTURE……….+5
TOTAL COOLING UNITS LAST SEASON TO DATE…….159   DIFFERENCE………12

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….20 S   AT   7:58 P.M.
ASOS……………………21 S   AT   7:57 P.M.
DAVIS…………………..19 S   AT   7:57 P.M.  RMY 21
FASTEST MILE FOR YESTERDAY…………………13 S   AT   8:06 P.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE………………15 S   AT   7:45 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..14 S   AT   8:06 P.M.
AVERAGE WIND SPEED AND DIRECTION…………. .7.8 WNW
ASOS……………………8.0
DAVIS…………………..6.7 SW [233 deg.]

*ADDITIONAL FASTEST MILE TIME OF 7:46 P.M. EST

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.00  DEPARTURE…..-0.11
ASOS……………0.00
TOTAL PRECIPITATION FOR THE MONTH………..0.59  DEPARTURE…..-0.06
ASOS……………0.60
TOTAL PRECIPITATION FOR THE YEAR………. 24.86  DEPARTURE…..-2.63
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/T/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/-2/0.05/559/61               23 SSE RMY N/A
6/21 76/60/68/0/1.14/202/22                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  82/58/70/-1/0.00/…/..               20 WSW RMY 20
7/6  85/64/75/+4/0.00/…/..               20 S   RMY 21

7/7 low since midnight is 65F; 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 7
HIGH 97F IN 1908,1993
LOW 48F IN 1902
PRECIP 2.11 INS IN 1966
PEAK GUST 55 MPH NW IN 1989

RECORDS FOR JULY 8
HIGH 95F IN 1981
LOW 50F IN 1919
PRECIP 1.74 INS IN 1916
PEAK GUST 46e SSW IN 1941

TODAY’S REPORT PREPARED BY: Brian Fitzgerald