Thursday, April 13, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY, APRIL 13, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0507E
SUNSET: 1823E
WALL TO WALL SUNSHINE WITH RECORD WARMTH HERE AT BLUE HILL…
The dry stretch of weather continues as we’ve not recorded any
rainfall in the last 7 days. The precipitation departure has
now slipping into a pretty sizable deficit for the month to
date, with us being more a 1.60″ below normal.
The temperature has made it to the mid 80s as of early this
afternoon. The high so far is 86F degrees, which has set a
new record for the date, beating the old record of 85F set
in 1945.
Yesterday I erroneously reported the record high minimum for
yesterday’s date was 50F set in 1955 and 2017, in actuality,
the record high minimum was 52F set in 1945 and 1947. With
the low for yesterday of 56F, we still did set a new record
for the date!
The wind has been much lighter than yesterday, but still
pretty steady out of the west. The average speed for the
day so far is around 12mph, with a peak gust of 23mph so
far.
Visibility has been limited today due to haziness, likely in
part due to the increase in tree pollen in the air. We’ve
only been able to see about 40-45 miles today.
The high so far today is 86F, which is 31F degrees above the
normal maximum of 55F. The low since midnight is 52F degrees,
which is 15 degrees above the normal minimum for the day of
37F.
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Today’s Observations:
7 A.M.
Weather: Clear
Temperature: 60F; Dew Point: 38F; Relative Humidity: 43%
Wind: SSW @ 10 kts
Sea-level pressure: 1011.0 mb; 29.86 in. Hg: falling, then rising
Visibility: 40 miles, hazy
6-hr Max temp: 60F
6-hr Min temp: 52F
24-hr Precip: 0.00
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 CLR 40 110/60/38/2110/986/ HAZY/ 8/000 53003 10060 20052
10 A.M.
Weather: Clear
Temperature: 78F; Dew Point: 47F; Relative Humidity: 34%
Wind: W @ 11G18 kts
Sea-level pressure: 1010.4 mb; 29.84 in. Hg: falling, then more rapidly
Visibility: 45 miles, hazy
3-hr Precip: 0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 CLR 45 104/78/47/2611G18/984/ HAZY/ 8/000 58006
1 P.M.
Weather: Clear
Temperature: 85F; Dew Point: 46F; Relative Humidity: 26%
Wind: WNW @ 11G18 kts
Sea-level pressure: 1008.6 mb; 29.78 in. Hg: falling steadily
Visibility: 45 miles, hazy
6-hr Max temp: 86F
6-hr Min temp: 60F
6-hr Precip: 0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 CLR 45 086/85/46/3011G18/978/ HAZY/ 8/000 57018
10086 20060
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SUMMARY FOR WEDNESDAY, APRIL 12, 2023
TEMPERATURE (DEGREES F)
MAX…….73 NORMAL…..55
MIN…….56R NORMAL…..37
MEAN……65 NORMAL…..46
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……..+19
TOTAL DEPARTURE FOR THE MONTH………………..+57 [+4.6 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE…….-19
TOTAL HEATING UNITS FOR THE MONTH…………..203 DEPARTURE…….-58
TOTAL HEATING UNITS FOR THE SEASON…………4735 DEPARTURE……-873
TOTAL HEATING UNITS LAST SEASON TO DATE…….5075 DEPARTURE……-340
PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all Main Tower.
F420C (Official)………..46 NW @ 9:33 A.M.
VECTOR #1 (1-Sec)……….49 NW @ 9:33 A.M.
VECTOR #2 (1-Sec)……….52 NW @ 9:33 A.M.
DAVIS #1……………….47 WNW @ 9:33 A.M.
DAVIS #2 ………………48 NW @ 9:33 A.M.
RMY #1 (Instantaneous)…..52 NW @ 9:33 A.M.
RMY #2 (Instantaneous)…..55 NNW @ 11:46 A.M.
MERLIN…………………45 NW
RICHARDS (C5C) (Inst)……49 @ 9:33 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………34 NW @ 11:42 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..31 @ 11:42 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..33 @ 9:37 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………32 NW @ 11:42 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………32 NNW @ 9:37 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..30 NW @ 11:42 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..31 NW @ 9:37 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………30 @ 9:35 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..14.6 NW [351 total miles]
VECTOR #1………………14.0
VECTOR #2………………14.9
DAVIS #1……………….M
DAVIS #2……………….14.8 NW
RMY #1…………………13.6 NW
RMY #2…………………14.6 NW
RICHARDS (C5C)………….14.3
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.18
TOTAL PRECIPITATION FOR THE MONTH…………..0.43 DEPARTURE…..-1.64
TOTAL PRECIPITATION FOR THE YEAR…………..15.04 DEPARTURE…..-1.05
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……-1.9
TOTAL SNOWFALL FOR THE SEASON (2022-2023)……34.9 DEPARTURE…..-33.9
————————————————————–
PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
VEC1: Vector #1 1-second gust
RMY: R.M. Young wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M: Missing data
4/1 60/39/50/+9/0.39/0.0/145/19 36 SW VEC1 40 SW RMY 41
4/2 50/30/40/-1/0.00/0.0/636/83 40 NNW VEC1 44 NNW RMY 45
4/3 51/28/40/-2/0.00/0.0/737/96 41 SSW VEC1 46 SSW RMY 46
4/4 62/40/51/+9/0.00/0.0/594/77 26 ENE VEC1 26 ENE RMY 27
4/5 45/37/41/-2/0.02/0.0/000/00 33 ENE VEC1 34 ENE RMY 37
4/6 62/37/50/+7/0.02/0.0/155/20 26 NW VEC1 28 NNW RMY 29
4/7 58/36/47/+3/0.00/0.0/328/42 45 WNW VEC1 48 WNW RMY 52
4/8 50/29/40/-4/0.00/0.0/767/98 26 NNW VEC1 29 NNW RMY 31
4/9 54/33/44/0/0.00/0.0/770/98 25 S VEC1 28 S RMY 28
4/10 65/33/49/+4/0.00/0.0/772/98 18 WSW VEC1 19 NW RMY 20
4/11 75/45/60/+15/0.00/0.0/522/66 37 W VEC1 37 W RMY 38
4/12 73/56/65/+19/0.00/0.0/…/.. 46 NW VEC1 49 NW RMY 52
4/13 The low since midnight is 52F, the daily normal low is 37F
DAILY RECORDS
04/12/2023: NEW RECORD HIGH MINIMUM TEMPERATURE OF 56F,
THIS BEATS THE OLD RECORD OF 52F SET IN 1945 AND 1947
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR APRIL 13
HIGH 85 IN 1945
LOW 22 IN 1939
PRECIP 2.51 IN. IN 2004
SNOWFALL 6.8 IN. IN 1933
PEAK GUST 79 MPH S IN 2020
RECORDS FOR APRIL 14
HIGH 80 IN 1945
LOW 21 IN 1923
PRECIP 1.86 IN. IN 1935
SNOWFALL 8.4 IN. IN 1953
PEAK GUST 71e MPH W IN 1943
TODAY’S REPORT PREPARED BY: Matt Douglas
