BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY CLIMATE SUMMARY
WEDNESDAY, APRIL 21, 2004
ALL TIMES ARE IN EASTERN DAYLIGHT TIME [unless otherwise noted]
TODAYS OBSERVATIONS....
4/21/2004 WED
8 a.m. high overcast with 50 miles visibility and 44 deg; wind ese at 10 mph..
six hour minimum temp. 42 deg.
BHO SA 1155 200 SCT 220 SCT E250 OVC 50 252/44/33/1009/027/ FEW AC NW-N DENSE CI ALQDS
OVC PTLY THN OVHD-W-N THN K LYR ALG HRZN W-NW VSBY NE 60/ 8/042 51015 10048 20042
11 a.m. high thin overcast with 60 miles visibility and 55 deg; wind se at 10 mph..
BHO SA 1455 150 SCT 220 SCT 250 -OVC 60 253/55/27/1409/027/ FEW ACC W FEW ACSL ALQDS
AC CHAOTIC DENSE CI WND 11V19/ 8/082 50001
2 p.m. mostly sunny and 60 miles visibility with temp. 61; dewpoint 28;
wind se at 15 mph gusting to 24 mph; six hour maximum temp. 61 deg.
BHO SA 1755 150 -SCT 60 233/61/28/1613G21/022/ LWR AC E-S ACSL ALQDS
WND 13V20/ 8/040 58020 10061 20044
WEATHER SUMMARY FOR TUESDAY, APRIL 20:
TEMPERATURE (DEGREES F)
MAX.....67 NORMAL.....57 HAZEN......66.9 @ 2:44 A.M.
MIN.....44 NORMAL.....39 HAZEN ... 44.3 @ 11:58 P.M. **
MEAN....56 NORMAL.....48
DEPARTURE FROM 30-YEAR NORMAL.....+8
TOTAL DEPARTURE FOR THE MONTH.....+24 (+1.0 DEGREE/DAY)
** eastern standard time
HEATING DEGREE DAYS
TOTAL HEATING DEGREE DAYS FOR YESTERDAY....... 9 DEPARTURE.....-8
TOTAL HEATING DEGREE DAYS FOR THE MONTH......386 DEPARTURE.....-24
TOTAL HEATING DEGREE DAYS FOR THE SEASON....5878 DEPARTURE....+ 4
TOTAL HEATING DEGREE DAYS FOR LAST SEASON...6314 DIFFERENCE..- 436
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY........45 W AT 3:18 A.M.
AEROVANE.........45 W AT 3:18 A.M.
ASOS.............40 W AT 3:18 A.M
FASTEST MILE FOR YESTERDAY..........33 W AT 3:19 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE.......33 W AT 3:19 A.M.
AVERAGE WIND SPEED AND DIRECTION.. 13.2 NW [uncorrected ]
ASOS.............13.8
PRECIPITATION (INCHES) THROUGH THIS MORNING
TOTAL PRECIPITATION 24 HRS ENDING 8 A.M....0.00 DEPARTURE....-0.14
ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........7.20 DEPARTURE....+4.25
ASOS..............6.78
TOTAL PRECIPITATION FOR THE YEAR..........14.87 DEPARTURE....-1.41
ASOS.............13.66
SNOWFALL (INCHES) THROUGH THIS MORNING
TOTAL SNOWFALL FOR 24 HRS ENDING 8 A.M......0.0 DEPARTURE....-0.1
TOTAL SNOWFALL FOR THE MONTH................0.5 DEPARTURE....-2.1
TOTAL SNOWFALL FOR THE SEASON..............58.0 DEPARTURE....+3.0
PRELIMINARY CLIMATE SUMMARY FOR APRIL 2004......CALENDAR DAY DATA
DATA REPORTED:
DATE MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane recording wind system when significant
TSTM: Thunderstorm day
....: Data not yet available
4/1 41/36/39/-2/3.47/0/000/00 44 MPH NE
4/2 37/36/36/-5/0.30/0/000/00 41 MPH NE
4/3 38/35/37/-5/0/0/0/000/00 25 MPH NE
4/4 47/35/41/-1/0.22/0/008/01 32 MPH NW
4/5 40/27/34/-9/0.09/0.5/178/23 45 MPH NW Aerovane 46 MPH NW
4/6 49/26/38/-5/0/0/747/96 52 MPH WNW Aerovane 56 MPH WNW
4/7 55/32/44/+1/0/0/530/68 31 MPH WSW
4/8 58/32/45/+1/0/0/.../.. 25 MPH S
4/9 60/39/50/+6/T/0/.../.. 32 MPH W
4/10 57/34/46/+2/0/0/.../.. 40 MPH W
4/11 51/36/44/-1/0/0/.../.. 21 MPH W
4/12 47/36/42/-3/0.07/0/.../.. 30 MPH ENE
4/13 59/37/48/+3/2.51/0/000/00 56 MPH S Aerovane 61 MPH S
4/14 59/44/52/+6/0.41/0/000/00 62 MPH S Aerovane 64 MPH S
4/15 52/37/45/-1/0.13/0/.../.. 36 MPH N Aerovane 38 MPH NNW
4/16 51/33/42/-3/0/0/.../.. 32 MPH NNW
4/17 74/34/55/+8/0/0/.../.. 29 MPH S
4/18 63/46/55/+8/0/0/.../.. 32 MPH SE
4/19 83/44/64/+17/0/0/.../.. 43 MPH SSW
4/20 67/44/56/+8/0/0/.../.. 45 MPH W
4/21 morning low 42 deg..
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
THE NEW APRIL RECORDS....
There are FOUR NEW APRIL RECORDS which have been established
thus far this month.
April 13 - Rainfall 2.51 inches for calendar day; previous record
1.95 inches in 1933.
April 1 - Rainfall 3.47 inches for calendar day; previous record
was 2.28 inches in 1962.
April record - New greatest daily rainfall 3.47 inches for any date
during April occurred on April 1; previous record 3.18 inches
on April 21, 1991.
April record - New greatest rainfall in "any" twenty-four hour
period during April of 3.47 inches occurred on April 1.
The previous record was 3.19 inches on April 20-21, 1991.
RECORDS FOR APRIL 21
HIGH 85 IN 1923
LOW 22 IN 1908
PRECIP 3.18 INCHES IN 1991
SNOWFALL 0.8 INCHES IN 1947
PEAK GUST 76e MPH NE IN 1940
RECORDS FOR APRIL 22
HIGH 85 IN 1977, 2001
LOW 26 IN 1981
PRECIP 1.85 INCHES IN 2000
SNOWFALL 3.0 INCHES IN 1940
PEAK GUST 68e MPH NW IN 1945
TODAY'S REPORT BY: Robert Skilling