Sunday, April 6, 2014
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, APRIL 6, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME
CALM, SEASONABLE SPRING DAY
This morning’s low temperature of 29F was the coolest reading for the month
of April so far, and the coolest reading since March 26. The average low for
this time of year is 34F. The temperature has risen steadily under very sunny
skies, with a high temperature through 2:00 P.M. EDT of 53F, close to the
average of 52F. There have been hardly any clouds observed today with very
dry air in place, dropping the humidity to under 30%. Winds have been fairly
light and variable, generally coming in from the W and NW. Visibility has
been around 70 miles all day, with some light distant haze being the only
limiting factor. Rainfall on Friday night and into Saturday provided exactly
half an inch of rain, our first precipitation event for April.
MARCH 2014 PRELIMINARY STATISTICS
[Departures are relative to the 1981-2010 averages]TEMPERATURE: Deg. F
Avg. Max. 40.5 [-3.8]
Avg. Min. 22.0 [-4.6]
Mean 31.3 [-4.2]
24-hr. corrected mean: 31.1
Max. temp: 57 on the 28th
Min. temp: 6 on the 4th
Total heating degree day units: 1,036 [+120]
Total seasonal heating units: 5,627 [+143]
[Season starts 7/1]
Seasonal total this date 2012: 5,020 [+607]
PRECIPITATION: Inches
Total: 5.03 [-0.55]
Greatest in 24 hours: 2.73 inches, 30th-31st
Total snowfall: 3.0 inches [-9.7]
Greatest in 24 hours: 1.4 inches on the 13th
WIND
Av. speed (uncorrected): 12.7 mph
Av. speed (corrected): 13.1 mph
Prevailing direction: NW @ 13% possible
SUNSHINE
Total astronomical minutes: 10,395 of possible 22,247 or 47%
Total Campbell Stokes card minutes; 10,056 of possible 21,516 or 47% [-2%]
More data will be made available in the next few days.
Today’s Observations:
7 A.M.
Weather: Clear, few cirrus distant offshore NE-SE, thin smoke layer above
horizon SW-WNW
Temperature: 34F; Dew Point: 23F; Wind: W at 9 kts,
Sea-level pressure: 30.11 ins. Hg, rising then rising more slowly
Visibility: 70 miles, light distant haze
6-hr max temp: 34F
6-hr min temp: 29F
BHO SA 1155 CLR 70 197/34/23/2709/011/ CI DSNT OFFSHR NE-SE
THN K LYR ABV HRZN SW-WNW LGT DSNT HZ/ 8/001 51033 10034 20029
10 A.M.
Weather: Sky perfectly clear [SKC]
Temperature: 44F; Dew Point: 20F; Wind: WNW at 12 kts
Sea-level pressure: 30.13 ins. Hg, rising then falling
Visibility: 70 miles, light distant haze
BHO SA 1455 CLR 70 203/44/20/3012/013/ SKC LGT DSNT HZ/ 8/000 50006
1 P.M.
Weather: Sky perfectly clear [SKC]
Temperature: 52F; Dew Point: 18F; Wind: WNW at 12 kts
Sea-level pressure: 30.11 ins. Hg, falling slightly
Visibility: 70 miles, light distant haze
6-hr max temp: 53F
6-hr min temp: 34F
BHO SA 1755 CLR 70 196/52/18/2912/011/ SKC LGT DSNT HZ WND 25V32/
8/000 56007 10053 20034
WEATHER SUMMARY FOR SATURDAY, APRIL 5, 2014
TEMPERATURE (DEGREES F)
MAX…..51 NORMAL…..51
MIN…..33 NORMAL…..34
MEAN….42 NORMAL…..43
DEPARTURE FROM 30-YEAR NORMAL…………………….-1
TOTAL DEPARTURE FOR THE MONTH…………………….+5 [+0.8 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..23 DEPARTURE……….+1
TOTAL HEATING UNITS FOR THE MONTH………….111 DEPARTURE……….-5
TOTAL HEATING UNITS FOR THE SEASON………..5738 DEPARTURE……..+138
TOTAL HEATING UNITS LAST SEASON TO DATE……5140 DIFFERENCE…….+598
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………39 WNW AT 7:33 P.M. *
AERO…………………..N/A
ASOS…………………..41 WNW AT 5:19 P.M.
DAVIS………………….38 WNW AT 3:33 P.M. RMY 40
FASTEST MILE FOR YESTERDAY………………..32 WNW AT 7:33 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE……………..31 W AT 7:33 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….27 W AT 7:37 P.M.
AVERAGE WIND SPEED AND DIRECTION…………15.5 WNW
ASOS…………………15.4
DAVIS………………..13.4 WNW [301 deg]
* Last of several occurrences…
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00 DEPARTURE………….-0.17
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.50 DEPARTURE………….-0.35
ASOS…………..0.48
TOTAL PRECIPITATION FOR THE YEAR……….15.62 DEPARTURE………….+0.77
ASOS………….16.02
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0 DEPARTURE…………..-0.1
TOTAL SNOWFALL FOR THE MONTH…………….0.0 DEPARTURE…………..-0.9
TOTAL SNOWFALL FOR THE SEASON…………..84.8 DEPARTURE………….+24.2
PRELIMINARY CLIMATE SUMMARY FOR APRIL 2014 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system 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 48/31/40/-1/0.00/0.0/…/.. 29 NNE AERO N/A RMY N/A
4/2 56/34/45/+4/0.00/0.0/…/.. 22 WSW AERO 20 MPH WSW RMY N/A
4/3 55/36/46/+4/0.00/0.0/…/.. 23 NNW AERO 22 MPH NW RMY 25
4/4 47/35/41/-1/…/0.0/…/.. 26 ESE AERO N/A RMY 25
4/5 51/33/42/-1/…/0.0/…/.. 39 WNW AERO N/A RMY 40
4/6 morning low temp: 29F; the normal low is now 34F
DAILY RECORDS FOR APRIL 2014
None so far.
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR APRIL 6
HIGH 82 IN 1921
LOW 16 IN 1982
PRE 1.72 INS IN 1886
SNOW 12.3 INS IN 1982
WIND 71e MPH WNW IN 1940
RECORDS FOR APRIL 7
HIGH 90 IN 2010
LOW 13 IN 1982
PRECIP 1.72 IN. IN 1924
SNOWFALL 4.5 IN. IN 1967, 1996
PEAK GUST 65 MPH WNW IN 1982
TODAY’S REPORT PREPARED BY: Jonathan O’Brien
