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Directory / City by Month
City by Month
by citybymonth.com · https://mcp.citybymonth.com/
Read-only city climate normals, daylight and month-by-month data. Every answer cites its page.
11 of 11 checks · 10 Nov 2026
At a glance
- Runs where
- On their server. What you send to it goes to them.
- What you need
- Nothing: it answered without a login
- Tools
- 4 tools
- Its own safety labels
- 4 read-only
- Memory it takes
- About 480 tokens of your AI's memory, just for its tool descriptions
- Largest answer
- About 7.3 KB in our test
- Speed
- Average answer in our test: 39 ms
Tokens are an estimate: the characters in its tool names, descriptions and inputs, divided by 4. The exact number depends on your AI model. Safety labels are what the server says about itself. From our latest test, 10 Nov 2026.
Is City by Month MCP server safe?
- None of the hidden-instruction wordings we know were found in its 4 tool descriptions.
- Its error messages showed no secrets or internal details.
- All 4 of its tools are labeled read-only.
- Overall it scored 93/100 on 10 Nov 2026.
A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.
What this test does not check
- Its source code and packages.
- What a tool quietly does behind the scenes, such as writing a file or calling another service.
- Instructions hidden inside live tool answers. We only look for those in tool descriptions.
- Hidden instructions worded in a way our list doesn't know yet.
- Tools that could change something. Those are read, never run.
What QAmcp can and can't see · How to tell if an MCP server is safe · Hidden instructions · Prompt injection
Known security advisories
It lists no public code, so there is nothing to look up in GitHub Security Advisories or OSV.dev. QAmcp tests how a server behaves. It does not scan source code.
What it can do
4 tools, in the server's own words.
list_citiesread-onlyEvery city in City by Month's data: slug, profile page, climate kind (station or model estimate).
city_monthread-onlyOne city's climate normals, daylight, rule result and ranks for one month.
best_timeread-onlyOne city: months meeting City by Month's weather rule, near misses, other misses (what fails, by how much), the rule.
compareread-only2-5 cities side by side for one month.
Test results
Safe mode: only tools labeled read-only were run. How the test works
- !Every tool is describednote
1 warning
- !compare: Inputs with no description: cities
- !Follows MCP best practices (not scored yet)note
1 tip (not scored)
- !1 tool answers with structured data but doesn't declare its shape (outputSchema): list_cities. If those answers change shape, nothing can catch it; with a schema, every answer is checked.
- ✓ConnectsConnected in 151 mspass
- ✓Ready for the newest MCP versionUses the latest MCP version (2026-07-28)pass
- ✓Lists its toolsFound 4 toolspass
- ✓Tools are labeled safe or dangerousEvery tool has a safety labelpass
- ✓No known hidden instructionsNone of the hidden-instruction wordings we know were found in tool descriptions. New wordings can get past this check.pass
- ✓Tools work with good inputspass
All good
- ✓list_cities: Worked (59 ms)
- ✓city_month: Answered with an error, probably because of our sample input: unknown city "test". Valid: argentina/buenos-aires (Buenos Aires), australia/melbourne (Melbourne), australia/sydney (Sydney), austria/vien…
- ✓best_time: Answered with an error, probably because of our sample input: unknown city "test". Valid: argentina/buenos-aires (Buenos Aires), australia/melbourne (Melbourne), australia/sydney (Sydney), austria/vien…
- ✓compare: Answered with an error, probably because of our sample input: cities must list 2-5 cities
- ✓Bad inputs give a clean errorpass
All good
- ✓city_month: Refused missing required input "city" with a clear error
- ✓city_month: Refused wrong type for "city" with a clear error
- ✓best_time: Refused missing required input "city" with a clear error
- ✓best_time: Refused wrong type for "city" with a clear error
- ✓compare: Refused missing required input "cities" with a clear error
- ✓compare: Refused wrong type for "cities" with a clear error
- ✓Fast enoughpass
All good
- ✓Connecting took 151 ms
- ✓Listing tools took 30 ms
- ✓Average tool answer: 39 ms
- ✓list_cities: Slowest tool: list_cities (59 ms)
- ✓No secrets leakedChecked 9 error messages: no secrets or internal detailspass
- –Tools work togetherNo tool's answer could be fed into another tool, so there were no chains to test (not counted either way)not tested
Test it yourself
Free and open source. Same checks, same score.
npx qamcp-cli https://mcp.citybymonth.com/Show this score on GitHub
Free for every server in the directory. Paste this into your README: the badge shows the score from our latest test.
[](https://qamcp.dev/s/com-citybymonth-citybymonth.html)Score over time
- 10 Nov 202693
One test so far. New tests will show here.
Reviews
Coming soon: reviews from people who use City by Month, signed in with GitHub, one per person. Reviews never change the score.
QAmcp Monitor tests it every hour and emails you when it goes down, the score drops, a tool changes or a secret leaks. Free for 1 server, no card.
Have a concern, or want it removed? Ask us and we'll take it off the list. How the directory works