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Monday, September 29, 2025

September 29, 2025

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA MONDAY SEPTEMBER 29, 2025 ALL TIMES ARE…

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BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA MONDAY SEPTEMBER 29, 2025 ALL TIMES ARE IN EASTERN STANDARD TIME (EST) SUNRISE: 0539E SUNSET:  1729E ABUNDANT SUNSHINE THROUGH THE MORNING, THEN INCREASING HIGH CLOUDS THIS AFTERNOON…. The day started off brilliantly with clear skies and plenty of bright sunshine. As we approached the early afternoon however, cirrus clouds have overspread the area as a system well to our south tries to push up the coast. As it looks right now, only clouds from this system will impact the area through tomorrow. Temperatures are still on the warm side today, but not quite as warm as the past few days. Readings have reached the mid to upper 70s early this afternoon. A nice change however is the lower dew point values today, making the air mass feel a lot more comfortable than over the weekend. Values have been mainly in the low 50s, but did drop to the mid 40s for a time during the late morning period. The wind was a bit busy during the overnight as a dry front pushed through the area switching the wind to north. It was gusty for a time thanks to some cold air advection. The wind has since diminished quite a bit into early this afternoon becoming light and variable. The average speed for the day so far is around 8mph, but it has been generally averaging around 2-4mph for the past 3 hours or so. The peak gust for the day is 18mph, which occurred just after midnight. Visibility has been decent for the most part, holding at around 60 miles all day. The maximum temperature so far today is 78F degrees, which is 10 degrees above the normal high of 68F. The minimum temperature since midnight is 58F degrees, which is 7 degrees above the normal low of 51F. ————————————————————– Today’s Observations: 7 A.M. Weather: Clear, few altocumulus distant S-SW, few cirrus distant ESE-S-WSW Temperature: 62F; Dew Point: 50F; Relative Humidity: 64% Wind: N @ 9 kts Sea-level pressure: 1024.6 mb; 30.26 in. Hg: rising unsteadily Visibility: 60 miles 6-hr Max temp: 65F 6-hr Min temp: 58F 24-hr Precip: 0.00 inches BHO SA 1155 CLR 60 246/62/50/3609/026/ FEW AC DSNT S-SW FEW CI DSNT ESE-S-WSW/ 8/051 52013 10065 20058 10 A.M. Weather: Clear, few cirrus distant SE-WSW Temperature: 74F; Dew Point: 51F; Relative Humidity: 44% Wind: E @ 2 kts, wind light and variable Sea-level pressure: 1025.0 mb; 30.27 in. Hg: rising, then falling Visibility: 60 miles 3-hr Precip: 0.00 inches BHO SA 1455 CLR 60 250/74/51/0802/027/ FEW CI DSNT SE-WSW WND L/V/ 8/004 50004 1 P.M. Weather: Broken cirrus Temperature: 77F Dew Point: 51F; Relative Humidity: 40% Wind: W @ 2 kts, wind light and variable Sea-level pressure: 1023.7 mb; 30.23 in. Hg: falling, then more rapidly Visibility: 60 miles 6-hr Max temp: 78F 6-hr Min temp: 62F 6-hr Precip: 0.00 inches BHO SA 1755 E250 BKN 60 237/77/51/2802/023/ WND L/V/ 8/004 58013 10078 20062 ————————————————————– SUMMARY FOR SUNDAY, SEPTEMBER 28, 2025 TEMPERATURE (DEGREES F) MAX…….81   NORMAL…..68 MIN…….63   NORMAL…..51 MEAN……72   NORMAL…..59 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………+13 TOTAL DEPARTURE FOR THE MONTH………………………+32 [+1.3 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026) TOTAL HEATING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-6 TOTAL HEATING UNITS FOR THE MONTH…………….41  DEPARTURE…….-45 TOTAL HEATING UNITS FOR THE SEASON……………61  DEPARTURE…….-43 TOTAL HEATING UNITS LAST SEASON TO DATE……….63  DEPARTURE……..-2 COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025) TOTAL COOLING UNITS FOR YESTERDAY……………..7  DEPARTURE……..+6 TOTAL COOLING UNITS FOR THE MONTH…………….61  DEPARTURE…….-12 TOTAL COOLING UNITS FOR THE SEASON…………..733  DEPARTURE…….+64 TOTAL COOLING UNITS LAST SEASON TO DATE………757  DEPARTURE…….-24 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 F420C (Official)………..22 N    @   10:56 P.M. VECTOR #1 (1-Sec)……….22 N    @   10:35 P.M. VECTOR #2 (1-Sec)……….23 N    @   10:35 P.M. DAVIS #1……………….20 N    @   10:35 P.M. DAVIS #2 ………………20 NNE  @   10:35 P.M. RMY #1 (Instantaneous)…..22 SW   @   10:24 A.M. RMY #2 (Instantaneous)…..22 N    @   10:35 P.M. MERLIN…………………20 N RICHARDS (C5C) (Inst)……21 SW   @   10:50 A.M. FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL………………15 N    @   10:38 P.M. MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15 SW   @   10:24 A.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15 SW   @   10:50 A.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………14 SW   @   10:50 A.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 SW   @   10:50 A.M. MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 SW   @   10:50 A.M. MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 SW   @   10:50 A.M. MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………14 SW   @   10:50 A.M. AVERAGE WIND SPEED AND DIRECTION: CONTACTING/OFFICIAL………9.1 WSW [218 total miles] VECTOR #1……………….9.4 VECTOR #2……………….9.7 DAVIS #1………………..9.2 SW DAVIS #2………………..9.4 WSW RMY #1………………….9.3 SW RMY #2………………….9.7 SW RICHARDS (C5C)…………..9.3 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.15 TOTAL PRECIPITATION FOR THE MONTH…………..4.49 DEPARTURE…..+0.74 TOTAL PRECIPITATION FOR THE YEAR (2025)…….35.82 DEPARTURE…..-2.54 ————————————————————– 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   73/55/64/-5/0.00/221/28            23 NE  VEC1 23 ENE RMY 23 9/2   77/58/68/-1/0.00/714/91            18 ESE VEC1 19 ESE RMY 18 9/3   78/57/68/0/0.00/719/92             21 SSW VEC1 21 SSW RMY 21 9/4   81/56/69/+1/0.00/694/89            26 SSW VEC1 27 SSW RMY 28 9/5   82/63/73/+5/0.12/404/52            30 SSW VEC1 31 SSW RMY 33 9/6   84/64/74/+6/1.05/457/59            55 W   VEC1 55 W   RMY 57 TSTM 9/7   64/56/60/-7/0.97/000/00            16 WNW VEC1 16 NNE RMY 15 9/8   68/49/59/-8/0.00/508/66            21 NW  VEC1 21 NW  RMY 24 9/9   70/53/62/-5/0.00/697/91            22 ENE VEC1 23 E   RMY 23 9/10  65/54/60/-6/0.00/183/24            24 NE  VEC1 25 NE  RMY 25 9/11  77/51/64/-2/0.00/714/94            21 N   VEC1 17 N   RMY 18 9/12  71/56/64/-2/0.00/735/97            24 ENE VEC1 24 NNE RMY 23 9/13  76/55/66/+1/T/634/84               26 S   VEC1 26 S   RMY 25 9/14  79/57/68/+3/0.00/572/76            15 NE  VEC1 15 SW  RMY 15 9/15  72/57/65/0/0.00/689/92             20 N   VEC1 19 N   RMY 18 9/16  71/55/63/-1/0.00/403/54            20 E   VEC1 19 ESE RMY 19 9/17  71/55/63/-1/T/424/57               22 E   VEC1 22 E   RMY 21 9/18  75/61/68/+5/0.44/252/34            20 S   VEC1 20 S   RMY 20 TSTM 9/19  80/57/69/+6/0.00/715/97            24 N   VEC1 24 N   RMY 23 9/20  67/51/59/-4/0.00/705/96            20 SE  VEC1 19 SE  RMY 18 9/21  68/52/60/-2/0.00/593/81            18 ESE VEC1 19 SE  RMY 19 9/22  73/53/63/+1/0.00/620/85            20 SSW VEC1 20 SW  RMY 21 9/23  78/57/68/+6/0.00/305/42            25 SW  VEC1 25 SW  RMY 26 9/24  64/61/63/+2/0.19/000/00            21 E   VEC1 21 E   RMY 22 9/25  70/62/66/+5/1.67/000/00            35 SSW VEC1 35 SSW RMY 35 TSTM 9/26  80/63/72/+12/0.00/…/..           24 NW  VEC1 23 WNW RMY 27 9/27  80/59/70/+10/0.00/…/..           20 S   VEC1 20 S   RMY 18 9/28  81/63/72/+13/0.05/…/..           22 N   VEC1 22 N   RMY 22 9/29 The low since midnight is 58F, the daily normal low is 51F. ————————————————————– SEPTEMBER DAILY RECORDS TO DATE NONE. ————————————————————– DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR SEPTEMBER 29 HIGH 85F IN 1952 LOW 28F IN 1914 (SEPTEMBER MINIMUM RECORD) PRECIP 2.61 INCHES IN 1907 PEAK GUST 62 MPH S IN 2005 RECORDS FOR SEPTEMBER 30 HIGH 84F IN 1986 LOW 31F IN 1992 PRECIP 2.44 INCHES IN 2015 PEAK GUST 71 MPH S IN 2020 TODAY’S REPORT PREPARED BY: Matt Douglas
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Blue Hill Observatory & Science Center · Legal

Data Use & Privacy Policy

Please read the full Policy before accessing Observatory data · Effective January 1, 2025

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
Part I — Data Use Policy
§ 01

Ownership and Proprietary Rights

All observational records, compiled datasets, metadata, database structures, and related materials provided by the Blue Hill Observatory & Science Center are the exclusive property of the Blue Hill Observatory & Science Center. The Observatory has maintained continuous weather observations at the summit of Great Blue Hill since 1885, and the entirety of that record — its compilation, structure, curation, and organization — constitutes a proprietary database protected under applicable United States law, including copyright law and common law database protections.

All rights not expressly granted in this Policy are reserved by the Observatory. No access to or use of Observatory data shall be construed as a waiver of any rights or as a license to use data beyond the scope expressly stated herein.

§ 02

Governing Law and Jurisdiction

This Policy shall be governed by and construed in accordance with the laws of the Commonwealth of Massachusetts, without regard to its conflict of law provisions. For interactions with international users, this Policy shall apply to the maximum extent permitted by applicable local law.

Any dispute arising from or related to this Policy shall be subject to the exclusive jurisdiction of the state and federal courts located in Norfolk County, Massachusetts. By accessing Observatory data, all users consent to personal jurisdiction in Massachusetts and waive any objection to the venue or inconvenience of such forum.

§ 03

Permitted Uses

Observatory data are made available for the following limited, non-commercial purposes only:

  • Personal study and analysis
  • Educational classroom use
  • Student projects
  • Non-commercial academic research
  • Publication of analyses, figures, models, or conclusions derived from the data, subject to the attribution requirements of Section 4

All other uses require prior written authorization from the Observatory.

§ 04

Attribution Requirement

Any use of Observatory data in any published, presented, or publicly distributed work must include the following verbatim acknowledgment:

“Data provided by the Blue Hill Observatory & Science Center, Milton, Massachusetts. Continuous weather observations since 1885.”

Failure to include proper attribution is a material violation of this Policy.

§ 05

Prohibited Uses

Unless explicitly authorized in writing, Users may not:

  • Resell, license, sublicense, or commercially exploit Observatory data in any form
  • Redistribute the dataset in whole or in part to any third party
  • Publish the dataset for download by third parties
  • Host, mirror, or archive the dataset on any external website, repository, or storage service
  • Upload the dataset to any public or institutional data repository
  • Provide the data through APIs, automated services, or subscription platforms
  • Incorporate the data into any commercial product, software, application, or service
  • Use the data for AI or machine learning systems intended for commercial use or external distribution
  • Use the data to create derivative datasets that enable reconstruction of the underlying observations
§ 06

Commercial Licensing

Organizations seeking to use Observatory data for commercial purposes must obtain a license prior to any such use. Licensing inquiries: data@bluehill.org.

§ 07

Automated Access

Automated scraping, bulk harvesting, or systematic downloading of Observatory data is strictly prohibited without prior written authorization.

§ 08

Enforcement and Remedies

Violation of this Policy may result in immediate revocation of data access, pursuit of legal remedies available under United States law, and referral to applicable authorities. The Observatory reserves all rights to seek injunctive relief, damages, and attorneys’ fees in connection with any unauthorized use of its data.

Part II — Privacy Policy
§ 09–10

Scope & Information Collected

This section governs the collection, use, storage, and disclosure of personal information from visitors to the Blue Hill Observatory website and users of its data services. The Observatory may collect contact information (name, email, organization) when voluntarily submitted, usage data including IP addresses and pages visited, and data download records.

§ 11–12

How We Use Information & Retention

Information is used solely for: responding to inquiries and licensing requests; monitoring and enforcing compliance with this Policy; improving website performance; and communicating Observatory news to opted-in users. The Observatory does not sell, rent, or share personal information with third parties for marketing purposes. Data access records may be retained indefinitely for compliance and enforcement purposes.

§ 13

International Users and Data Transfers

The Observatory is located in the United States. International users acknowledge their information will be processed in the United States under U.S. law. Users requiring specific data processing agreements under non-US law must contact data@bluehill.org before accessing data.

§ 14–16

Cookies, Security & Children’s Privacy

The Observatory website may use cookies for analytics and functionality. By continuing to use the site, users consent to cookie use. The Observatory implements reasonable measures to protect personal information but cannot guarantee absolute security. Observatory data services are not directed at children under 13.

Part III — General Provisions
§ 17–20

Modifications, Severability, Entire Agreement & Contact

The Observatory reserves the right to modify this Policy at any time. Updated versions will be posted at bluehill.org. Continued use of Observatory data following any modification constitutes acceptance of the revised Policy. This Policy constitutes the entire agreement between the User and the Observatory. Questions and licensing inquiries: Blue Hill Observatory & Science Center, Milton, Massachusetts — data@bluehill.org

By accessing, downloading, or using any Blue Hill Observatory data or services, you acknowledge that you have read, understood, and agree to be bound by this Policy.
Effective January 1, 2025 · Blue Hill Observatory & Science Center · Milton, Massachusetts
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