Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
which month
Grammar usage guide and real-world examplesUSAGE SUMMARY
"which month" is a grammatically correct and usable phrase in written English.
It is typically used to ask for specific information about a particular month. You can use it when you want to inquire about a specific time or event in a certain month. Example: "Which month is your birthday in?" or "Which month are you planning to take your vacation?".
✓ Grammatically correct
News & Media
Science
Wiki
Alternative expressions(3)
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
45 human-written examples
and finding that the September effect varies depending on which month most people go away.
News & Media
Here are the data — I've included commodity prices (IMF index) as well as consumer prices for the people who believe that the BLS is hiding true inflation (which it isn't): A couple of notes: for the commodity prices it matters which month you start, because they dropped sharply between August and September 2008.
News & Media
In which month in 2009 did Murray rise to world No 2? A. June B. July C. August D. December Answers 1. C; 2. C; 3. C; 4. A 5. A; 6. D; 7. A; 8. A; 9. B; 10.
News & Media
Then, Bernard is able to know which month it is.
News & Media
The numbers may vary depending on which month is being used as the benchmark.
News & Media
And which, month in, month out, digitally enhances already beautiful stars – whitening eyes, magicking away muffin-tops – to sell things and make the rest of the world feel bad so that they indulge in more retail therapy.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
12 human-written examples
Now, of course, we realise they never said which November.
News & Media
"They just forgot to tell us which October".
News & Media
Writer attended one at which June Havoc, actress, was a speaker.
News & Media
They are also born with darker passions, like self-love and tribalism, which mar rationalist enterprises.
News & Media
There is funny stuff here, especially a scene in which May and June share a bed.
News & Media
Expert writing Tips
Best practice
When posing a question, "which month" implies a need to select from a limited or previously specified range of options. If any month is possible, 'What month' is usually more adequate.
Common error
Avoid using "which month" when any month of the year is a valid answer. Instead, use "what month" to indicate an open-ended question without a predefined set of options. For example, use "What month were you born in?" rather than "Which month were you born in?" if the possibilities are not narrowed down.
Source & Trust
84%
Authority and reliability
4.6/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "which month" functions as an interrogative phrase, specifically used to inquire about a particular month. It presupposes a limited set of options or a previously mentioned context, directing the respondent to select the appropriate month. Ludwig provides numerous examples illustrating this function.
Frequent in
News & Media
45%
Science
39%
Wiki
6%
Less common in
Formal & Business
4%
Encyclopedias
1%
Reference
1%
Ludwig's WRAP-UP
The phrase "which month" is a common and grammatically sound interrogative phrase used to inquire about a specific month, particularly when a limited set of options is implied. As Ludwig AI confirms, it's widely accepted and used across diverse contexts, including news, science, and general knowledge domains. When using this phrase, it's essential to consider whether the context provides a clear set of months to choose from; otherwise, "what month" may be more appropriate. Understanding the nuances of "which month" ensures clear and effective communication.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
what month
Replaces "which" with "what", offering a more direct alternative while retaining the same core meaning.
in what month
Adds the preposition "in" to clarify the question's focus on identifying the month.
during which month
Emphasizes the time period in question, suitable for contexts where duration is relevant.
what specific month
Adds "specific" to emphasize the need for a precise answer.
which calendar month
Clarifies that the month refers to the standard calendar system.
identify the month
Shifts from a question to a directive, asking to pinpoint the relevant month.
determine the month
Similar to "identify the month", but emphasizes a process of discovery or calculation.
specify the month
Focuses on providing an exact and unambiguous answer.
the month in question
Refers to a month previously mentioned or implied in the conversation.
the relevant month
Highlights the importance of choosing the correct month within a specific context.
FAQs
How is "which month" used in a sentence?
You can use "which month" to ask for specific information about a particular month when there's a limited set of options. For example: "Which month did the event take place in?" or "Which month is best for visiting?
What is an alternative to asking "which month"?
Depending on the context, you could ask "what month" if you're not limiting the choices, or "in what month" to specify a timeframe.
When is it appropriate to use "which month" versus "what month"?
Use "which month" when you have a limited set of months in mind or have already mentioned some months as options. Use "what month" when any of the twelve months is a valid answer, and you're not limiting the options.
Is there a more formal way to phrase "which month"?
In a more formal context, you might use "during what month" or "in which month" to maintain a higher level of formality.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
84%
Authority and reliability
4.6/5
Expert rating
Real-world application tested