Monday, July 20, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JULY 20, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

HEAT AND HUMID COMBINE FOR POSSIBLE HOTTEST DAY
OF THE YEAR SO FAR

Yesterday’s heat and humidity were aided by strong
sunlight just prior to the 1:00 PM EST observation
where a maximum reading of 89F was recorded. This
reading had surpassed the previous maximum temperature
of 88F, reached twice so far this year.

Brief overnight showers brought 0.01 inches of new rain,
sparing the summit of any thunderstorms that were
strong in many northern areas of New England. Temperatures
dipped to a warm overnight minimum of 73F.

Today, plentiful sunshine had allowed temperatures to
hit 80F by the 7:00 AM EST observation and a maximum reading
of 89F by the 1:00 PM EST observation.
Today’s Observations:

7 A.M.
Weather: Clear, few cirrostratus distant E-SW
Temperature: 80F; Dew Point: 72F; Wind: estimated WNW at 6 kts
Wind Speed: Light
Sea-level pressure: 29.70 ins. Hg, rising, then more slowly
Visibility: 15 miles, hazy
6-hr Max temp: 80F
6-hr Min temp: 73F
24-hr precip: 0.01 inches
BHO SA 1155 CLR 15 058/80/72/E2906/970/ FEW CS DSNT E-SW HAZY
WND LGT/ 8/008 51006 MANUAL 70001 10080 20073

10 A.M.
Weather: Clear, few cumulus in all direction, few altocumulus
distant W-NNW, few cirrostratus distant ESE-SSW
Temperature: 87F; Dew Point 71F; Wind: estimated WNW at 6 kts
Wind Speed: Light
Sea-level pressure: 29.70 ins. Hg, rising then falling
Visibility: 30 miles, hazy
BHO SA 1455 CLR 30 059/87/71/E2906/970/ FEW CU ALQDS
FEW AC DSNT W-NNW FEW CS DSNT ESE-SSW HAZY WND LGT/ 8/138 50001

1 P.M.
Weather: Scattered cumulus, scattered altocumulus,
few moderate cumulus distant ENE
Temperature: 89F; Dew Point: 68F; Wind: W at 13 kts,
Sea-level pressure: 29.68 ins. Hg, falling then more slowly
Visibility: 25 miles, hazy
6-hr Max temp: 89F
6-hr Min temp: 80F
BHO SA 1755 40 SCT 60 SCT 25 052/89/68/2713/968/
FEW MDT CU DSNT ENE HAZY/ 8/230 56007 10089 20080
SUMMARY FOR SUNDAY, JULY 19, 2015

TEMPERATURE (DEGREES F)
MAX…..89   NORMAL…..81
MIN…..68   NORMAL…..63
MEAN….79   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL……………………+7
TOTAL DEPARTURE FOR THE MONTH……………………+6 [+0.1 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..14   DEPARTURE……….+6
TOTAL COOLING UNITS FOR THE MONTH………….130   DEPARTURE……….+0
TOTAL COOLING UNITS FOR THE SEASON…………268   DEPARTURE……….+9
TOTAL COOLING UNITS LAST SEASON TO DATE…….267   DIFFERENCE………+1

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….25   SSW AT  4:05 P.M.
ASOS……………………27   SSW AT  4:05 P.M.
DAVIS…………………..26   SSW AT  4:04 P.M. RMY 27
FASTEST MILE FOR YESTERDAY…………………20   SSW AT  4:04 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………21   SSW AT  4:06 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..20   SSW AT  4:05 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..10.1 SW
ASOS…………………..10.4
DAVIS…………………..9.7 SW  [215 deg.] * Last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.01  DEPARTURE…..-0.12
ASOS……………0.00
TOTAL PRECIPITATION FOR THE MONTH………..2.99  DEPARTURE…..+0.66
ASOS……………3.01
TOTAL PRECIPITATION FOR THE YEAR………..27.26  DEPARTURE…..-2.04
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 89/68/79/+7/0.01/…/..               25 SSW RMY 27

7/20 low since midnight is 73F; 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 20
HIGH 99F IN 1991
LOW 47F IN 1890
PRECIP 1.64 INS IN 1938
WIND 56e MPH SSW IN 1943

RECORDS FOR JULY 21
HIGH 100F IN 1977 [RECORD FOR MONTH] LOW 48F IN 1890
PRECIP 2.09 INS IN 1938
PEAK GUST 60e MPH WNW IN 1977

TODAY’S REPORT PREPARED BY: Brian Fitzgerald