How Hard Is the CBM Exam? Complete Difficulty Guide 2026

What Actually Makes the CBM Exam Hard

The Certified Broadcast Meteorologist credential from the American Meteorological Society (AMS) is not hard in the way a bar exam or a PE exam is hard. It is hard in a different, more specific way: it tests whether a working broadcast meteorologist has a complete command of the science behind the forecast, across everything from radar interpretation to climate change to flood hazards, and then separately tests whether that person can communicate it on air.

Three features drive the difficulty:

• Breadth. AMS publishes fifteen substantive subject headings for the written test. A candidate who is brilliant at severe weather but rusty on numerical weather prediction or climatology has a real gap to close.
• No published weighting. AMS does not publish topic percentages, so you cannot concentrate your effort on a few heavily weighted areas and ignore the rest.
• Two separate evaluations. Passing the written exam is one component. The weathercast evaluation is a distinct hurdle with its own scoring standard.

If you are still orienting yourself on what the credential is, start with our overview of what CBM certification is, then come back here to calibrate how much preparation you need.

The Format: 100 Questions, Closed Book, 75% to Pass

The written examination consists of 100 multiple-choice and true-false questions. It is closed book, so there are no reference sheets, glossaries, or look-ups during the test. The passing score is 75%, which means you can miss only a limited number of questions before falling short. Two details are worth being careful about:

• Scored versus unscored questions. The split is not disclosed, so you should assume every question could count and avoid guessing which ones do not.
• Time limit. An older provider FAQ lists 120 minutes. The current testing provider is SMT/Prometric (the older AMS FAQ still names PSI), so reconfirm the time allowance on your actual appointment confirmation rather than relying on a legacy number.

Calculator rules and whether the exam is adaptive are not verified in the public materials, so check those details when you schedule. For a deeper look at the scoring threshold itself, see our guide to the CBM passing score.

Fifteen Subject Areas, No Published Weights

The AMS written-test reference list organizes preparation around fifteen substantive headings. These are issuer-published topic areas, not an official weighted blueprint, and AMS does not claim they are exhaustive. The areas are:

1. General Meteorological Knowledge
2. Climatology & Climate Change
3. Cyclones and Jets
4. Data & Instruments
5. Flooding
6. Numerical Weather Prediction
7. Physical Meteorology
8. Radar Meteorology
9. Regional Weather
10. Satellite
11. Severe Storm Structure/Tornadoes
12. Station Scientist
13. Tropical Meteorology
14. Weather Safety
15. Winter Weather

Note that the AMS Glossary of Meteorology entry that precedes these on the reference page is a general terminology resource, not a sixteenth subject area. For a domain-by-domain walkthrough, see the full CBM exam domains guide.

Where Candidates Tend to Struggle

AMS publishes no per-domain difficulty data, so any ranking of "hardest" areas is editorial judgment rather than measured fact. That said, the structure of the subject list suggests where working broadcasters most often feel exposed. The reasoning is simple: on-air work reinforces some skills daily and lets others atrophy.

Areas that daily work keeps sharp

Most working broadcasters live in Severe Storm Structure/Tornadoes, Winter Weather, Weather Safety, and Regional Weather. These are the topics that dominate the forecast desk, so recall tends to be strong, though the exam may probe underlying structure and physics rather than operational habits.

Areas where gaps commonly hide

The Station Scientist heading is also worth attention because it speaks to the broader role of a broadcast meteorologist as a trusted scientific voice, not just a forecast presenter. Since AMS does not publish weights, treat every one of these as potentially testable.

The Second Hurdle: Weathercast Evaluation

Many candidates focus entirely on the written test and underestimate the on-air component. The credential requires submitting two additional weathercasts. The rules are specific:

• Each must be active and routine, meaning real operational work rather than a staged demo.
• Each has a maximum length of 5 minutes.
• A score above 3.0 on average is required separately in each of three categories: Graphical Content, Explanation, and Presentation.
• Spanish-language submissions require an English transcript.

These evaluation criteria are not written-test topic domains, so do not confuse them with the fifteen subject areas above. A 2019 Board note estimated that about half of candidates passed the first weathercast evaluation, but that is a historical estimate about the weathercast stage, not a current written-exam pass rate. For a fuller discussion of what is and is not known, see our breakdown of the CBM pass rate.

The Eligibility Gate Before You Ever Test

A large part of what makes the CBM credential rigorous happens before the exam. Applicants must show:

• An accredited meteorology or atmospheric-science degree, or an approved equivalent
• The required coursework, documented with transcripts
• Either 2 years of full-time or 3 years of part-time on-air experience

Student-station work is excluded from the experience requirement. No separate training-hour or reference requirement was verified in the public materials. Because this filter screens out under-qualified applicants, the people who reach the written exam are already working professionals with relevant degrees, which affects how you should interpret difficulty. The full picture is in our guide to CBM requirements.

What a Retake Costs You

Part of the "hardness" is financial. The application fee is $330 for AMS members and $660 for nonmembers. Each scheduling adds a testing fee: $60 for remote proctoring, $75 at a US test center, or $85 at an international center. A first remote attempt therefore totals $390 for members or $720 for nonmembers, excluding dues and preparation costs.

The credential is valid for 1 year. Annual renewal costs $206 for members or $515 for nonmembers, and you need 28 professional-development points every 5 years. The full financial picture is in our CBM certification cost breakdown, and you can weigh it against the benefits in is the CBM certification worth it.

A Domain-Sequenced Prep Plan

Because AMS publishes no weights, a sensible plan sequences domains by dependency and by how far they sit from your daily work. This is an editorial suggestion, not an official AMS schedule. Build foundations first, then the observation tools, then the hazard topics you already know well.

Foundations come first because concepts such as stability and moisture underpin radar, satellite, and storm-structure questions. Hazard topics come late because most working broadcasters already have strong operational familiarity with them. Adjust the order to your own gaps. For a complete preparation framework, see the CBM study guide, and keep the CBM cheat sheet handy for last-week review.

Who Finds It Easier, Who Finds It Harder

Difficulty is relative to your background. Consider these profiles, offered as general patterns rather than measured outcomes:

• Degree-fresh meteorologists with a few years on air often have recent exposure to physics, dynamics, and thermodynamics, but may need to deepen applied and communication-oriented topics.
• Veteran broadcasters bring strong operational instincts and regional knowledge but often need the most refresh time on theory-heavy areas such as Physical Meteorology and Numerical Weather Prediction.
• Part-time or smaller-market meteorologists may have broad hands-on experience across many duties, which helps with Station Scientist and Regional Weather topics, but may have less exposure to specialized data or tropical content.

The credential matters most to those working in or targeting television and media roles. If you are weighing the career side, our guides on CBM jobs and the CBM salary guide cover that context. Note that AMS does not publish current written-exam pass statistics, so any precise "percent who pass" number you encounter should be treated skeptically.

Frequently Asked Questions