BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, APRIL 27, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME
CLOUDY AND COOL ONCE AGAIN, LIGHT SHOWERS BRING
TRACES OF NEW RAIN
Clouds that moved in Sunday morning were still present by
this morning’s 7:00 AM EST observation. A trace of rain was
recorded some time before the observation, with virga visible
in all directions.
Cool conditions mean another day without this year’s first
70 degree day. A significant warm up still does not seem
likely this week, possibly inching 2015 closer to the top
10 latest 70 degree readings.
BHO Latest First 70-deg Temperature, (1885-2014)
1) 20 May, 1966
2) 19 May, 1917
3) 14 May, 1924
4) 11 May, 1975
5) 10 May, 1893
6) 7 May, 1971
7) 5 May, 1939
8) 3 May, 1937
3 May, 1904
10) 2 May, 1916
2 May, 1919
Today’s Observations:
7 A.M.
Weather: Broken altocumulus, thin overcast of altostratus,
virga distant in all directions, breaks in overcast north
Temperature: 47F; Dew Point: 34F; Wind: NW at 9 kts,
Sea-level pressure: 29.61 ins. Hg, increasing then decreasing
Visibility: 70 miles
6-hr Max temp: 47F
6-hr Min temp: 42F
24-hr precip: Trace
BHO SA 1155 E70 BKN 90 -OVC 70 027/47/34/3209/961/
VIRGA DSNT ALQDS BINOVC N/ 8/010 50003 MANUAL 6000/ 10047 20042
10 A.M.
Weather: Broken stratocumulus, broken altocumulus
Temperature: 52F; Dew Point: 35F; Wind: WNW at 11G18 kts,
Sea-level pressure: 29.59 ins. Hg, decreasing then more slowly
Visibility: 80 miles
BHO SA 1455 E40 BKN 85 BKN 80 020/52/35/2911G18/959/ 8/530 56007
1 P.M.
Weather: Broken stratocumulus, thin overcast of altocumulus,
virga and showers distant SE-NNE, breaks in overcast WNW
Temperature: 54F; Dew Point: 33F; Wind: NW at 13G19 kts,
Sea-level pressure: 29.56 ins. Hg, falling, then more slowly
Visibility: 80 miles, except 60 miles SE
6-hr Max temp: 56F
6-hr Min temp: 46F
6-hr precip: Trace
BHO SA 1755 E42 BKN 60 -OVC 80 009/54/33/3113G19/956/
VSBY SE 60 MI SHWRS AND VIRGA DSNT SE-NNE BINOVC WNW/ 8/530 56011
MANUAL 6000/ 10056 20046
SUMMARY FOR SUNDAY, APRIL 26, 2015
TEMPERATURE (DEGREES F)
MAX…..54 NORMAL…..60
MIN…..39 NORMAL…..42
MEAN….47 NORMAL…..51
DEPARTURE FROM 30-YEAR NORMAL…………………..-4
TOTAL DEPARTURE FOR THE MONTH………………….+24 [+0.7 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..18 DEPARTURE………..+4
TOTAL HEATING UNITS FOR THE MONTH………….471 DEPARTURE……….-26
TOTAL HEATING UNITS FOR THE SEASON………..6214 DEPARTURE………+230
TOTAL HEATING UNITS LAST SEASON TO DATE……6080 DIFFERENCE……..+134
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………17 NW AT 10:53 P.M. *
ASOS…………………..18 NNW AT 9:43 P.M.
DAVIS………………….15 WNW AT 12:50 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………..11 NNW AT 10:17 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..22 NNW AT 11:34 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….11 NW AT 1:01 P.M.
AVERAGE WIND SPEED AND DIRECTION………….6.3 NNW
ASOS………………….6.4
DAVIS…………………5.3 NNW [329 degrees]
* Last of several occurrences…
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….TRACE DEPARTURE…..-0.14
ASOS……………0.00
TOTAL PRECIPITATION FOR THE MONTH………..3.08 DEPARTURE…..-0.94
ASOS……………3.05
TOTAL PRECIPITATION FOR THE YEAR………..17.67 DEPARTURE…..-0.22
ASOS…………….N/A ***
*** ASOS annual totals not available due to erroneous readings
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………..0.0 DEPARTURE……0.0
TOTAL SNOWFALL FOR THE MONTH……………TRACE DEPARTURE…..-2.9
TOTAL SNOWFALL FOR THE SEASON…………..150.8 DEPARTURE….+88.2
PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/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
4/1 44/26/35/-6/0.00/0.0/748/98 30 WNW RMY 31
4/2 59/29/44/+3/T/0.0/375/49 39 SSW RMY 43
4/3 56/47/52/+10/0.02/0.0/000/00 36 SW RMY N/A
4/4 49/32/41/-1/…./0.0/501/65 54 NW RMY 64
4/5 47/30/39/-4/…./0.0/464/60 40 W RMY 45
4/6 48/33/41/-2/0/00/0.0/544/70 18 NE RMY N/A
4/7 39/34/37/-6/…./0.0/000/00 21 NE RMY N/A
4/8 41/32/37/-7/…./T/000/00 30 ENE RMY 32
4/9 35/32/34/-10/…./0.0/000/00 31 ENE RMY 32
4/10 53/35/44/-1/…./0.0/000/00 31 SW RMY N/A
4/11 56/38/46/+1/0.00/0.0/744/94 39 WNW RMY 48
4/12 68/35/52/+7/0.00/0.0/762/96 23 WNW RMY 23
4/13 69/47/58/+12/0.00/0.0/764/96 35 SSW RMY N/A
4/14 65/51/58/+12/0.05/0.0/072/09 37 SSW RMY N/A
4/15 67/45/56/+9/0.00/0.0/786/98 32 NW RMY 33
4/16 64/42/53/+6/0.00/0.0/765/95 31 S RMY 21
4/17 64/45/55/+8/0.05/0.0/065/08 31 SSW RMY 32
4/18 64/43/54/+6/0.00/0.0/770/95 31 N RMY 36
4/19 55/39/47/-1/0.00/0.0/724/89 25 NNW RMY N/A
4/20 55/38/47/-2/…./0.0/000/00 36 SE RMY 40
4/21 67/51/59/+10/…./0.0/417/51 30 SSE RMY N/A
4/22 67/45/56/+7/0.03/0.0/…/.. 44 SSW RMY 52
4/23 49/34/42/-8/0.00/0/0/…/.. 32 W RMY N/A
4/24 50/32/41/-9/0.00/0.0/…/.. 32 NW RMY 36
4/25 56/30/43/-7/0.00/0.0/…/.. 26 NW RMY 29
4/26 54/39/47/-4/0.00/0.0/…/.. 17 NW RMY N/A
4/27 Low since midnight is 42F, normal low is 42F
DAILY RECORDS FOR APRIL 2015
4/3 – NEW RECORD DAILY HIGH MINIMUM TEMPERATURE: 47F
surpasses the previous record of 46F in 1892
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR APRIL 27
HIGH 93 IN 1990
LOW 28 IN 1919
PRECIP 1.89 IN 1979
SNOWFALL 2.7 IN. IN 1993
PEAK GUST 65e MPH N IN 1941
RECORDS FOR APRIL 28
HIGH 92 IN 1990, 2009
LOW 26 IN 1947
PRECIP 2.41 IN 1904
SNOWFALL 10.0 IN. IN 1987
PEAK GUST 69 MPH NE 1967
TODAY’S REPORT PREPARED BY: Brian Fitzgerald
Monthly Skymail, event announcements, and research summaries.
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