Thursday, October 1, 2026

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

THURSDAY, OCTOBER 1, 2026
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0541E
SUNSET:  1726E

STILL CAN’T SHAKE THE CLOUDS, BUT WARMER AND MORE HUMID TODAY….

Another day with very limited sunshine as the clouds just don’t
want to leave the region. A warmer and more humid air mass has
moved into the region however as an upper ridge builds over the
eastern U.S. for a couple of days.

The final monthly total precipitation for September is 11.53″.
This ranks as the 2nd Wettest September on record going back to
1885. Here are the rankings.

BHO Wettest Septembers, inches (1885-2026):

1) 12.37 1999
2) 11.53 2026
3) 11.04 1933
4) 10.23 1896
5) 10.00 1961
6) 9.62 1987
7) 9.58 1888
8) 9.36 1918
9) 9.25 2018
10) 8.81 1907

Temperatures are even milder today than yesterday with readings
reaching the mid 70s early this afternoon. This is of course
above normal for early October as the normal high should be in
the mid 60s now. It is more humid today as well as the dew point
has pushed into the mid 60s.

The wind was light throughout the morning hours, but has picked
up a bit early this afternoon. The flow has been mainly out of
west-southwest to southwest today. The average speed for the day
so far is around 10mph. The peak gust so far is 21mph, which
occurred just before 1pm this afternoon.

Visibility has been somewhat limited today due to thin fog early
this morning, and then haziness for the balance of the day. The
view has improved from around 20 miles early this morning to
around 40 miles by early this afternoon.

The maximum temperature so far today is 74F, which is 7 degrees
above the normal high of 67F. The minimum temperature since
midnight is 56F, which is 6 degrees above the normal low of 50F.

————————————————————–

PRELIMINARY STATS FOR SEPTEMBER 2026

TEMPERATURE, Deg. F
Avg. Max. 70.1 [-2.6] Avg. Min. 54.9 [-0.7] Mean      62.5 [-1.7] 24-hour corrected mean: 62.2
Max. for month: 84F on the 4th, 10th
Min. for month: 46F on the 24th

HEATING DEGREE DAYS
Total heating units:    118 [+018] Total for the season:   121 [+003] Total for last season:   63

COOLING DEGREE DAYS
Total cooling units:    051 [-023] Total for the season:   805 [+135] Total for last season:  736

PRECIPITATION, Inches
Total: 11.53 [+7.47] Greatest in 24 hrs: 6.53 on the 26th-27th

SNOWFALL, Inches
Total:  0.0 [ 0.0] Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed: 10.5 mph
Avg. corrected wind speed:   11.0 mph
Prevailing wind direction:   Northeast [15%] Peak gust and direction:     58 NE on the 26th

SUNSHINE:
Campbell-Stokes card minutes: 10578 of a possible 21582, or 49%
Astronomical total minutes: 11016 of a possible 22421 or 49%

————————————————————–

Today’s Observations:

7 A.M.
Weather: Overcast altocumulus/altostratus, few breaks in overcast
all quadrants
Temperature: 59F; Dew Point: 58F; Relative Humidity: 97%
Wind: SW @ 6 kts, wind light
Sea-level pressure: 1019.3 mb; 30.10 in. Hg: steady, then rising
Visibility: 20 miles, thin fog
6-hr Max temp: 59F
6-hr Min temp: 56F
24-hr Precip: 0.01 inches
BHO SA 1155 E150 OVC 20 193/59/58/2306/010/ FEW BINOVC ALQDS
THN F ALQDS VSBY HIER ABV INVRSN WND LGT/ 8/07/ 53005 70001
10059 20056

10 A.M.
Weather: Overcast altocumulus/altostratus, few breaks in overcast
all quadrants
Temperature: 68F; Dew Point: 63F; Relative Humidity: 83%
Wind: WSW @ 6 kts, wind light
Sea-level pressure: 1019.3 mb; 30.10 in. Hg: steady
Visibility: 35 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 E150 OVC 35 193/68/63/2406/010/ FEW BINOVC ALQDS
HAZY WND LGT/ 8/07/ 54000

1 P.M.
Weather: Overcast altocumulus/altostratus, few breaks in overcast
all quadrants, few cumulus WNW-NNE
Temperature: 73F; Dew Point: 63F; Relative Humidity: 70%
Wind: SW @ 8G17 kts
Sea-level pressure: 1017.0 mb; 30.03 in. Hg: falling, then more slowly
Visibility: 40 miles, hazy
6-hr Max temp: 74F
6-hr Min temp: 59F
6-hr Precip: 0.00 inches
BHO SA 1755 E120 OVC 40 170/73/63/2308G17/003/ FEW BINOVC ALQDS
FEW CU WNW-NNE HAZY/ 8/27/ 56023 10074 20059

————————————————————–

SUMMARY FOR WEDNESDAY, SEPTEMBER 30, 2026

TEMPERATURE (DEGREES F)
MAX…….68   NORMAL…..67
MIN…….56   NORMAL…..50
MEAN……62   NORMAL…..59

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+3
TOTAL DEPARTURE FOR THE MONTH (SEP)…………………-43 [-1.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2026 THRU JUN 2027)
TOTAL HEATING UNITS FOR YESTERDAY……………..3  DEPARTURE……..-4
TOTAL HEATING UNITS FOR THE MONTH (SEP)………118  DEPARTURE…….+18
TOTAL HEATING UNITS FOR THE SEASON…………..121  DEPARTURE……..+3
TOTAL HEATING UNITS LAST SEASON TO DATE……….63  DEPARTURE…….+58

COOLING DEGREE DAYS (SEASON: JAN 2026 THRU DEC 2026)
TOTAL COOLING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH (SEP)……….51  DEPARTURE…….-23
TOTAL COOLING UNITS FOR THE SEASON…………..805  DEPARTURE……+135
TOTAL COOLING UNITS LAST SEASON TO DATE………736  DEPARTURE…….+69

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all on Main Tower.
E=Estimated *=Last of multiple occurrences

F420C (Official)………..15 WSW  @   11:27 P.M.
VECTOR #1 (1-Sec)……….16 WSW  @   11:26 P.M.
VECTOR #2 (1-Sec)……….16 WSW  @   11:26 P.M.
DAVIS #1……………….15 WSW  @   11:44 P.M.
DAVIS #2 ………………15 WSW  @   11:16 P.M.
RMY #1 (Instantaneous)…..15 WSW  @   11:14 P.M.
RMY #2 (Instantaneous)…..16 WSW  @   11:26 P.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)……15 WSW  @   11:15 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………10 WSW  @   11:05 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..11 SW   @   10:58 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..12 SW   @   11:06 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………11 WSW  @   11:28 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………12 WSW  @   11:06 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..11 WSW  @   11:09 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..12 SW   @   11:06 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………11 WSW  @   11:09 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..3.2 WSW [76 total miles] VECTOR #1………………5.3
VECTOR #2………………5.4
DAVIS #1……………….4.5 SW
DAVIS #2…………………M
RMY #1…………………5.2 SW
RMY #2…………………5.4 SW
RICHARDS (C5C)………….5.3

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.01 DEPARTURE…..-0.15
TOTAL PRECIPITATION FOR THE MONTH (SEP)…….11.53 DEPARTURE…..+7.47
TOTAL PRECIPITATION FOR THE YEAR (2026)…….37.52 DEPARTURE…..-1.15

————————————————————–

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
PEAK GUST: F420C (Official)
VEC1: Vector #1 1-second gust
RMY:  R.M. Young #1 wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

9/1  69/57/63/-6/0.21/008/01             15 SSW VEC1 15 E   RMY 14
9/2  76/58/67/-2/0.00/393/50             21 ESE VEC1 21 ESE RMY 20
9/3  74/60/67/-1/0.45/196/25             24 SSE VEC1 24 SSE RMY 23
9/4  84/63/74/+6/0.00/624/80             24 NNW VEC1 25 NNW RMY 24
9/5  71/60/66/-2/T/412/53                24 ENE VEC1 24 ENE RMY 25
9/6  69/53/61/-7/0.35/364/47             24 NE  VEC1 24 NNE RMY 27
9/7  79/52/66/-1/0.00/732/95             30 NW  VEC1 30 NW  RMY 30
9/8  80/58/69/+2/0.00/546/71             23 WNW VEC1 22 NNW RMY 24
9/9  80/58/69/+2/0.02/130/17             36 SSW VEC1 36 SSW RMY 36
9/10 84/67/76/+10/T/641/84               44 W   VEC1 43 W   RMY 47
9/11 77/59/68/+2/0.00/654/86             23 NW  VEC1 23 NW  RMY 25
9/12 77/55/66/0/0.00/667/88              23 SSW VEC1 23 SSW RMY 22
9/13 67/60/64/-1/0.98/000/00             25 SE  VEC1 26 SE  RMY 24
9/14 72/53/63/-2/T/572/76                32 NNW VEC1 32 NNW RMY 34
9/15 68/48/58/-7/0.00/727/97             18 S   VEC1 18 SE  RMY 18
9/16 78/53/66/+2/0.00/522/70             21 SW  VEC1 21 WSW RMY 21
9/17 82/63/73/+9/0.03/394/53             25 SW  VEC1 25 SW  RMY 27
9/18 79/58/69/+6/T/636/86                26 N   VEC1 26 NNW RMY 27
9/19 63/50/57/-6/0.00/531/72             21 N   VEC1 20 N   RMY 20
9/20 61/51/56/-7/0.11/000/00             21 SSE VEC1 22 SSE RMY 21
9/21 64/51/58/-4/0.11/542/74             24 ENE VEC1 23 ENE RMY 23
9/22 60/52/56/-6/0.00/481/66             32 ENE VEC1 32 ENE RMY 33
9/23 63/50/57/-5/0.00/566/78             39 ENE VEC1 38 ENE RMY 39
9/24 61/46/54/-7/0.00/607/84             35 NE  VEC1 33 ENE RMY 35
9/25 61/48/55/-6/0.05/000/00             46 NE  VEC1 45 NE  RMY 47
9/26 58/52/55/-5/3.35/000/00             58 NE  VEC1 58 NE  RMY 58
9/27 59/53/56/-4/5.15/000/00             52 NE  VEC1 51 NE  RMY 54
9/28 56/52/54/-5/0.66/000/00             36 NNE VEC1 35 NNE RMY 35
9/29 63/52/58/-1/0.03/007/01             20 NNW VEC1 20 NNW RMY 21
9/30 68/56/62/+3/0.03/064/09             15 WSW VEC1 15 WSW RMY 15

10/1 The low since midnight is 56F, the daily normal low is 50F.

————————————————————–

SEPTEMBER DAILY RECORDS TO DATE

9/26 RECORD PEAK WIND GUST OF 58 MPH NE,
BEATING THE OLD RECORD OF 54 MPH S SET IN 1977

9/27 RECORD DAILY RAINFALL OF 5.15 INCHES,
BEATING THE OLD RECORD OF 2.26 INCHES SET IN 1962

————————————————————–

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR OCTOBER 1
HIGH 85F IN 1927
LOW 30F IN 1992
PRECIP 1.63 INCHES IN 2014
PEAK GUST 68e MPH SSE IN 1977

RECORDS FOR OCTOBER 2
HIGH 85F IN 1968
LOW 29F IN 1899
PRECIP 1.75 INCHES IN 1984
PEAK GUST 53 MPH ENE IN 2022

TODAY’S REPORT PREPARED BY: Matt Douglas/Amanda Joly