Monday, April 3, 2017
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, APRIL 3, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME
WARMER TEMPERATURES RETURN TO GREAT BLUE HILL
High pressure brought warm dry air to Great Blue Hill today.
The day started off mild with and above average overnight
low of 35F, average is 33F. The high for yesterday was a seasonable
53F. By 1pm today we have already reached and above average temperature
of 57F. Normal maximum temperature is 51F. As the temperature rose
the dew points fell into the low 20’s making for very dry air. The
dry air allowed for 70 miles of visibility with a distant haze at 1pm.
Winds were light and continued from the NW. Skies were overcast
with a layer of cirrostratus clouds remaining all day.
*March precipitation totals have been corrected.
PRELIMINARY STATS FOR MARCH 2017
TEMPERATURE, Deg. F
Avg. Max. 39.8 [-4.5]
Avg. Min. 23.4 [-3.2]
Mean 31.6 [-3.9]
24-hour corrected mean: 31.6
Max. for month: 61F on 1st
Min. for month: 4F on 12th
HEATING DEGREE DAYS
Total heating units: 1025 [+109]
Total for the season: 4902 [-582]
Total for last season: 4419
PRECIPITATION, Inches
Total: 4.84 [-0.74]
Greatest in 24 hrs: 2.15 on the 14th
SNOWFALL, Inches
Total: 11.4 [-1.3]
Greatest in 24 hrs: 7.3 in. on 14th
WIND, mph
Avg. uncorrected wind speed: 14.3
Avg. corrected wind speed: 14.6
Prevailing wind direction: W at 18%
Peak gust and direction: 60 NE on 14th
SUNSHINE:
Campbell-Stokes card minutes: 11,490 minutes of possible 21,516 or 53%
Astronomical total minutes: 11,899 minutes of possible 22,264 or 53%
March 2017’s average temperature measured 31.6F which was
colder than each of the last three winter months. March has
been colder than February of the same year three times in
the past, and colder than all three preceding winter months
only once before in 1936-1937.
BHO Lowest Mar-Feb 24-hour Mean Temperature Difference, deg F (1885-2017):
1) -5.4 in 1984
2) -3.1 in 1960
3) -2.2 in 2017
4) -0.3 in 1937
5) +0.8 in 1890
+0.8 in 1997
7) +0.9 in 1939
8) +1.2 in 1954
Today’s Observations:
7 A.M.
Weather: Broken cirrostratus
Temperature: 40F; Dew Point: 26F; Wind: WNW at 5 kts,
Wind speed: Light
Sea-level pressure: 30.11 ins. Hg,falling then rising
Visibility: 80 miles
6-hr Max temp: 40F
6-hr Min temp: 35F
24-hr precip: 0.00 in.
24-hr snowfall: 0.0 in.
BHO SA 1155 E250 BKN 80 196/40/26/2905/011/ WND LGT 8/008 4/001
53018 10040 20035
10 A.M.
Weather: Few altocumulus SW-NW, broken cirrostratus
Temperature: 49F; Dew Point: 22F; Wind: NW at 7 kts
Sea-level pressure: 30.11 ins. Hg, rising then falling
Visibility: 70 miles
BHO SA 1455 E250 BKN 70 196/49/22/3107/011/ FEW AC SW-NW 8/088 58000
1 P.M.
Weather: Few altocumulus W-NNE, broken cirrostratus
Temperature: 47F; Dew Point: 30F; Wind: NW at 9G17 kts
Sea-level pressure: 30.02 ins. Hg, falling, then more quickly
Visibility: 70 miles
6-hr Max temp: 47F
6-hr Min temp: 31F
BHO SA 1755 E250 BKN 70 176/57/23/3007/005/ FEW AC W-NNE DSNT HZ W-NW
8/088 58020 10058 20040
SUMMARY FOR SUNDAY, APRIL 2, 2017
TEMPERATURE (DEGREES F)
MAX…..53 NORMAL…..50
MIN…..30 NORMAL…..33
MEAN….42 NORMAL…..41
DEPARTURE FROM 30-YEAR NORMAL…………………….+1
TOTAL DEPARTURE FOR THE MONTH…………………….-7 [-3.5 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..23 DEPARTURE……….-1
TOTAL HEATING UNITS FOR THE MONTH…………..55 DEPARTURE……….+7
TOTAL HEATING UNITS FOR THE SEASON………..4957 DEPARTURE……..-575
TOTAL HEATING UNITS LAST SEASON TO DATE……4442 DIFFERENCE…….+515
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….32 NW AT 5:13 P.M.
AERO……………………33 NW AT 5:13 P.M.
ASOS……………………34 NW AT 5:05 P.M.
DAVIS…………………..31 NNW AT 5:04 P.M. RMY 34
FASTEST MILE FOR YESTERDAY…………………24 NW AT 5:07 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………24 NW AT 5:05 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..24 NNW AT 5:05 P.M.
AVERAGE WIND SPEED AND DIRECTION………….10.1 NW
ASOS…………………..9.5
DAVIS………………….8.8 NNW [339 deg.]
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……….2.21 DEPARTURE……+1.87
ASOS…………..2.17
TOTAL PRECIPITATION FOR THE YEAR……….16.40 DEPARTURE……+2.06
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0 DEPARTURE…….-0.2
TOTAL SNOWFALL FOR THE MONTH…………….2.7 DEPARTURE…….+2.3
TOTAL SNOWFALL FOR THE SEASON…………..66.4 DEPARTURE…….+6.3
PRELIMINARY CLIMATE SUMMARY FOR MARCH CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY 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
M: Missing data
3/1 61/46/54/+23/0.01/0.0/000/00 41 S AERO 45 S RMY 45
3/2 55/26/41/+10/T/T/509/75 58 W AERO 61 W RMY 59
3/3 36/19/28/-4/T/T/592/87 38 W AERO 44 W RMY N/A
3/4 20/7/14/-18/T/T/622/91 45 NW AERO 48 NW RMY 51
3/5 29/5/17/-15/0.00/0.0/687/100 35 WNW AERO 43 WNW*RMY N/A
3/6 40/11/26/-6/0.00/0.0/641/93 18 WNW AERO 17 NW* RMY N/A
3/7 47/29/38/+5/0.01/0.0/000/00 32 S AERO 35 S RMY 36
3/8 55/43/49/+16/0.05/0.0/320/46 35 W AERO 36 W RMY 37
3/9 49/35/42/+9/0.0/0.0/684/98 53 W AERO 59 W RMY 58
3/10 35/20/28/-5/0.27/2.9/000/00 35 WNW AERO 44 WNW RMY 40
3/11 20/7/14/-20/0.02/0.2/612/87 43 W AERO 47 W RMY 50
3/12 25/4/15/-19/0.00/0.0/679/96 32 W AERO 40 WNW RMY N/A
3/13 33/8/21/-13/0.00/0.0/667/94 25 WNW AERO 29 WNW RMY N/A
3/14 38/23/31/-4/2.15/7.3/000/00 60 NE AERO 62 NE RMY 62
3/15 27/15/21/-14/0.00/0.0/536/75 36 W AERO 37 W RMY N/A
3/16 33/17/25/-10/0.00/0.0/696/97 36 W AERO 37 W RMY 38
3/17 40/22/31/-5/0.00/0.0/577/80 25 WNW AERO 24 WNW RMY 27
3/18 36/24/30/-6/0.00/0.0/557/77 26 ENE AERO 24 ENE RMY 26
3/19 35/28/32/-4/0.01/T/153/21 39 N AERO 37 N RMY 39
3/20 49/29/39/+2/0.00/0.0/686/94 31 N AERO 35 N RMY 36
3/21 52/34/43/+6/0.00/0.0/418/57 28 W AERO 26 W RMY N/A
3/22 38/15/27/-10/T/T/603/82 46 NW AERO 50 NW RMY 51
3/23 36/13/25/-13/0.00/0.0/716/97 36 WNW AERO 35 WNW RMY 38
3/24 44/25/35/-3/0.02/T/000/00 37 S AERO 38 S RMY 39
3/25 44/31/38/0/0.07/0.07/000/00 22 NE AERO 20 NE RMY 21
3/26 42/29/36/-3/0.00/0.0/232/31 25 ENE AERO 23 ENE RMY 25
3/27 43/33/38/-1/0.51/0.0/000/00 22 E AERO 18 E RMY N/A
3/28 40/33/37/-2/0.69/0.0/000/00 16 N AERO 15 N RMY N/A TSTM
3/29 46/33/40/0/0.11/0.0/053/07 37 NW AERO 36 NW RMY 37 TSTM
3/30 50/30/40/0/0.00/0.0/659/87 23 NW AERO 21 NW RMY N/A
3/31 37/32/35/-6/0.92/1.0/000/00 25 E AERO 30 E RMY N/A
DAILY RECORDS FOR MARCH 2017
3/11/17: DAILY RECORD LOW MAXIMUM TEMPERATURE OF 20F,
TIES PREVIOUS RECORD SET IN 1885
3/14/17: DAILY RECORD MAXIMUM SNOWFALL OF 7.3 INS,
BREAKS PREVIOUS RECORD OF 6.7 INS SET IN 1958
PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY 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
M: Missing data
4/1 35/31/33/-8/…./2.7/000/00 40 ENE AERO 41 ENE RMY 41
4/2 53/30/42/+1/…./../…/.. 32 NW AERO 33 NW RMY 34
4/3 Low temp since midnight is 35F; normal low is now 33F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR APRIL 3
HIGH 76 IN 1892
LOW 16 IN 1894
PRECIP 2.18 IN. IN 1990
SNOWFALL 8.0 IN. IN 1915
PEAK GUST 83e MPH NW IN 1977 [RECORD FOR MONTH]
RECORDS FOR APRIL 4
HIGH 76 IN 2010
LOW 12 IN 1954
PRECIP 1.45 IN. IN 1987
SNOWFALL 7.3 IN. IN 2016
PEAK GUST 80 MPH WNW IN 1963
TODAY’S REPORT PREPARED BY: Kaitlin Geagan
