Climacell

Climacell (styled ClimaCell) was a Boston-based weather-intelligence startup that pioneered a "Weather of Things" approach — deriving hyperlocal precipitation and atmospheric conditions from wireless-signal attenuation, connected devices, and its own proprietary numerical weather model — and exposed it through a developer-facing REST weather API. Backed by Canaan Partners among others, the company rebranded to Tomorrow.io in 2020 and its legacy climacell.co domain now 301-redirects to www.tomorrow.io. The surviving product is the Tomorrow.io v4 Weather API, which supersedes the original ClimaCell v3 API and exposes 60+ hyperlocal data layers (core weather, air quality, pollen, fire, flood, lightning, maritime, aviation, road) with realtime, forecast, historical, map-tile, and webhook-alert access. This profile is the historical ClimaCell identity; the enriched, live provider record lives in the api-evangelist tomorrow-io repository.

Climacell is profiled on the APIs.io network. Tagged areas include Weather, Forecast, Climate, Weather Intelligence, and Air Quality.

Climacell’s developer surface includes developer portal, documentation, API reference, getting-started guide, signup flow, pricing, engineering blog, and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub

23.3/100 emerging ▬ flat Agent 0/100 human only saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

0 APIs

Weather Forecast Climate Weather Intelligence Air Quality PrecipitationWeather of ThingsGeospatial Risk Alerts

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 23.3/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 9.0 / 20

Access Clarity 8.9 / 20

Operational Transparency 0.7 / 13

Contract Governance 0.0 / 12

Discoverability 4.6 / 10

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/climacell: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Climacell Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

Portal

Portal

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Build 2

SDKs, sample code, and the tooling you integrate with

Packages

Packages

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: climacell
name: Climacell
description: Climacell (styled ClimaCell) was a Boston-based weather-intelligence startup that pioneered a "Weather of Things"
  approach — deriving hyperlocal precipitation and atmospheric conditions from wireless-signal attenuation, connected devices,
  and its own proprietary numerical weather model — and exposed it through a developer-facing REST weather API. Backed by
  Canaan Partners among others, the company rebranded to Tomorrow.io in 2020 and its legacy climacell.co domain now 301-redirects
  to www.tomorrow.io. The surviving product is the Tomorrow.io v4 Weather API, which supersedes the original ClimaCell v3
  API and exposes 60+ hyperlocal data layers (core weather, air quality, pollen, fire, flood, lightning, maritime, aviation,
  road) with realtime, forecast, historical, map-tile, and webhook-alert access. This profile is the historical ClimaCell
  identity; the enriched, live provider record lives in the api-evangelist tomorrow-io repository.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: ''
humanURL: https://www.climacell.co
url: https://raw.githubusercontent.com/api-evangelist/climacell/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-status: rebranded
x-former-name: ClimaCell
x-successor: tomorrow-io
x-successor-name: Tomorrow.io
x-legacy-domain: climacell.co
x-live-domain: tomorrow.io
x-backed-by:
- canaan-partners
x-tier: stub
x-tier-reason: portfolio-lead-rebranded
tags:
- Weather
- Forecast
- Climate
- Weather Intelligence
- Air Quality
- Precipitation
- Weather of Things
- Geospatial
- Risk
- Alerts
kind: contract
access: 3rd-Party
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
apis: []
common:
- type: Website
  url: https://www.tomorrow.io/
- url: security/climacell-domain-security.yml
  type: DomainSecurity
- url: packages/climacell-packages.yml
  type: Packages
- url: https://www.tomorrow.io
  type: Portal
  x-note: legacy climacell.co redirects here (successor Tomorrow.io)
- url: https://docs.tomorrow.io
  type: Documentation
  x-note: successor Tomorrow.io developer docs
- url: https://docs.tomorrow.io/reference/welcome
  type: APIReference
  x-note: successor Tomorrow.io API reference
- url: https://docs.tomorrow.io/reference/getting-started
  type: GettingStarted
  x-note: successor Tomorrow.io
- url: https://app.tomorrow.io/signup
  type: SignUp
  x-note: successor Tomorrow.io
- url: https://www.tomorrow.io/pricing/
  type: Pricing
  x-note: successor Tomorrow.io
- url: https://www.tomorrow.io/blog/
  type: Blog
  x-note: successor Tomorrow.io
- url: https://support.tomorrow.io
  type: Support
  x-note: successor Tomorrow.io
- url: https://www.tomorrow.io/legal/tos/
  type: TermsOfService
  x-note: successor Tomorrow.io
- url: https://www.tomorrow.io/legal/privacy-policy/
  type: PrivacyPolicy
  x-note: successor Tomorrow.io
- url: https://github.com/Tomorrow-IO-API
  type: GitHubOrganization
  x-note: successor Tomorrow.io
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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