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Saturday, September 6, 2025

September 6, 2025

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SATURDAY, SEPTEMBER 6, 2025 ALL TIMES ARE…

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BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SATURDAY, SEPTEMBER 6, 2025 ALL TIMES ARE IN EASTERN STANDARD TIME (EST) SUNRISE: 0515E SUNSET:  1809E VERY EARLY MORNING FOG LIFTS, BUT WILDFIRE SMOKE RETURNS…. The hazy wildfire smoke from the western U.S. and/or central Canada has returned to the area. Skies were nearly clear for a brief time this morning following sunrise, however there was barely any “sunshine” as the sun had that deep reddish hue common when there is smoke in the atmosphere. The smoke has tended to decrease a bit early this afternoon, but clouds have since increased in coverage helping to filter the sun as well. Temperatures overnight stayed on the warm side with the low only dropping to 66F. This is 7 degrees above the normal low for today’s date. With such a high launching pad, readings have quickly risen into the mid 80s by early this afternoon. Perhaps more jarring today is the dew point’s return to the low 70s, which hasn’t happened since early August! It is quite humid today, but thankfully there is a good breeze to keep the air moving. The wind has continued to be on the busy side today, mainly out of the south and south-southwest. The speed has averaged at around 14mph for the day so far. Frequent gusts over 20mph have been occurring, with a peak gust so far of 35mph which occurred around 12:40pm. Visibility has been rather limited today, first due to fog, and then the haziness from the smoke. The view was generally been between 15-20 miles most of the morning, but has improved to around 30 miles early this afternoon as the smoke continues to decrease in density. The maximum temperature so far today is 84F degrees, which is 7 degrees above the normal high of 77F. The minimum temperature since midnight is 66 degrees, which is 7 degrees above the normal low of 59F. ————————————————————– Today’s Observations: 7 A.M. Weather: Broken cirrus, few stratus fractus all quadrants, smoke layer all quadrants and aloft Temperature: 68F; Dew Point: 67F; Relative Humidity: 95% Wind: SSW @ 12G18 kts Sea-level pressure: 1016.5 mb; 30.02 in. Hg: rising, then more rapidly Visibility: 15 miles, thin fog 6-hr Max temp: 68F 6-hr Min temp: 66F 24-hr Precip: 0.00 inches BHO SA 1155 E250 BKN 15 165/68/67/2012G18/002/ FEW STFRA ALQDS THN F ALQDS K LYR ALQDS AND ALF/ 8/701 53010 10068 20066 10 A.M. Weather: Broken stratocumulus, smoke layer all quadrants Temperature: 76F; Dew Point: 70F; Relative Humidity: 82% Wind: SSW @ 14G22 kts Sea-level pressure: 1016.2 mb; 30.01 in. Hg: rising, then falling Visibility: 20 miles, hazy 3-hr Precip: 0.00 inches BHO SA 1455 E10 BKN 20 162/76/70/2014G22/001/ K LYR ALQDS HAZY/ 8/500 58003 1 P.M. Weather: Scattered altocumulus, broken cirrus, towering cumulus distant W-NW, few cumulus/fractus all quadrants, smoke layer all quadrants Temperature: 83F Dew Point: 72F; Relative Humidity: 67% Wind: S @ 15G27 kts, peak wind S 35mph at 12:41 P.M. Sea-level pressure: 1013.9 mb; 29.94 in. Hg: falling, then more rapidly Visibility: 30 miles, hazy 6-hr Max temp: 84F 6-hr Min temp: 68F 6-hr Precip: 0.00 inches BHO SA 1755 85 SCT E250 BKN 30 139/83/72/1915G27/994/ TCU DSNT W-NW FEW CU/CUFRA ALQDS K LYR ALQDS HAZY PK WND 1930/41/ 8/251 58023 10083 20068 ————————————————————– SUMMARY FOR FRIDAY, SEPTEMBER 5, 2025 TEMPERATURE (DEGREES F) MAX…….82   NORMAL…..77 MIN…….63   NORMAL…..59 MEAN……73   NORMAL…..68 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+5 TOTAL DEPARTURE FOR THE MONTH………………………..0 [-0.2 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026) TOTAL HEATING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-1 TOTAL HEATING UNITS FOR THE MONTH……………..1  DEPARTURE……..-4 TOTAL HEATING UNITS FOR THE SEASON……………21  DEPARTURE……..-2 TOTAL HEATING UNITS LAST SEASON TO DATE……….14  DEPARTURE……..+7 COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025) TOTAL COOLING UNITS FOR YESTERDAY……………..8  DEPARTURE……..+4 TOTAL COOLING UNITS FOR THE MONTH…………….18  DEPARTURE……..-4 TOTAL COOLING UNITS FOR THE SEASON…………..690  DEPARTURE…….+72 TOTAL COOLING UNITS LAST SEASON TO DATE………713  DEPARTURE…….-23 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)………..30 S    @   03:21 P.M. VECTOR #1 (1-Sec)……….31 SSW  @   03:24 P.M. VECTOR #2 (1-Sec)……….31 SSW  @   03:56 P.M. DAVIS #1……………….32 S    @   01:20 P.M. DAVIS #2 ………………37 S    @   03:40 P.M. RMY #1 (Instantaneous)…..33 SSW  @   03:07 P.M. RMY #2 (Instantaneous)…..32 SSW  @   03:56 P.M. MERLIN…………………29 SW RICHARDS (C5C) (Inst)……30 SSW  @   03:54 P.M. FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL………………25 SSW  @   03:04 P.M. MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..21 SSW  @   03:22 P.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..23 SSW  @   04:53 P.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………21 S    @   03:53 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………26 S    @   03:41 P.M. MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..22 SSW  @   03:08 P.M. MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..24 SSW  @   04:54 P.M. MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………21 SSW  @   03:22 P.M. AVERAGE WIND SPEED AND DIRECTION: CONTACTING/OFFICIAL……..13.7 SSW [328 total miles] VECTOR #1………………13.7 VECTOR #2………………14.8 DAVIS #1……………….13.2 S DAVIS #2……………….15.1 SSW RMY #1…………………13.3 SSW RMY #2…………………14.9 S RICHARDS (C5C)………….13.1 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.12 TOTAL PRECIPITATION FOR THE MONTH…………..0.12 DEPARTURE…..-0.46 TOTAL PRECIPITATION FOR THE YEAR (2025)…….31.45 DEPARTURE…..-3.74 ————————————————————– 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/…/..            26 SSW VEC1 27 SSW RMY 28 9/5   82/63/73/+5/0.12/…/..            30 SSW VEC1 31 SSW RMY 33 9/6 The low since midnight is 66F, the daily normal low is 59F. ————————————————————– 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 6 HIGH 92F IN 1900, 2018 LOW 39F IN 1888 PRECIP 3.19 INCHES IN 1890 PEAK GUST 78e MPH SE IN 1979 (TROPICAL STORM DAVID) RECORDS FOR SEPTEMBER 7 HIGH 92F IN 2007, 2015, 2023 LOW 40F IN 1888 PRECIP 2.91 INCHES IN 1891 PEAK GUST 58e MPH W IN 1941 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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