NOAA climate outlook probabilities: how to read above, near, and below normal

Choose the right time window

A 6–10 day outlook answers a different question than a seasonal outlook

The Climate Prediction Center publishes temperature and precipitation outlooks for several periods, including days 6–10, days 8–14, one month, and overlapping three-month seasons.

Start with the map whose valid dates cover your decision. The 6–10 and 8–14 day products are issued daily. Monthly and seasonal products look farther ahead and are better suited to broad planning than to choosing a precise hour for travel, work, or an outdoor event. Always read the issue date and valid period printed on the product; an older map may no longer be the latest official outlook.

Three categories · One favored outcome

“Above normal” describes a category, not a specific temperature or rain total

CPC outlooks divide historical conditions into three categories: above normal, near normal, and below normal. A shaded area means one category has an enhanced probability relative to the other two.

On a temperature map, “above” means the period-average temperature is favored to fall in the warmest third of the historical distribution for that place and time of year. On a precipitation map, it means the period total is favored to fall in the wettest third. It does not mean every day will be warmer, every location will be wet, or the value will exceed normal by the percentage printed on the map.

The number is a probability for the category. A 50% above-normal area means a 50% chance that the period lands in the above-normal category—not “50% warmer,” “50% more rain,” or rain on half the days.

Equal chances · Not a promise of average weather

A white “EC” area means no category is favored

Equal Chances means the outlook does not tilt the odds toward above-, near-, or below-normal conditions; each category begins with roughly a one-in-three climatological chance.

EC does not forecast near-normal conditions, calm weather, or “nothing happening.” A period can still finish in any of the three categories, and significant daily weather can occur inside a near-normal monthly or seasonal average. The signal may be too weak, inconsistent, or uncertain for CPC to favor one category.

Probability · Not magnitude

The map cannot tell you how far above or below normal the period will finish

CPC probability shading communicates confidence in a category, not the size of the departure from normal and not the probability of a specific hazardous event.

Two places can carry the same above-normal probability while having very different normal climates and very different possible outcomes. The legend, explanatory text, and discussion belong with the map. Read them together, and avoid translating a broad regional color into an exact value for one town.

For precipitation, the outlook also does not replace a probability-of-precipitation forecast. The climate outlook covers the total over a multi-day or multi-month period; a local rain chance addresses measurable precipitation at a point during a particular forecast period.

From broad signal to local decision

Use the outlook first, then narrow the view

1. Confirm the issue date and valid period. Make sure the map covers the dates you care about and is the latest official version.
2. Read the variable and category. Temperature and precipitation maps answer different questions; note whether above, near, below, or no category is favored.
3. Read the probability—not just the color. Treat it as the chance of a category, never as a predicted temperature or rainfall amount.
4. Move to local products as the date approaches. Check the NWS point forecast for expected values and timing, then read any active watch or warning for hazards and protective action.

This sequence is useful for travel, seasonal maintenance, outdoor work, event planning, and household preparation: the outlook identifies a broad pattern worth monitoring, while the local forecast answers what is expected at your place and time.

Different products · Different decisions

An outlook is not a forecast, watch, or warning

Outlook

A broad, probabilistic signal for a future period. CPC climate outlooks favor a temperature or precipitation category; they do not predict exact local values or issue hazard instructions.

Forecast

The expected conditions, values, and timing for a specific place or forecast area. Use it as the date approaches and expect details to change with new observations.

Watch

A hazardous event is possible. Read the official watch area and timing, prepare to act, and keep checking for updates.

Warning

A hazardous event is occurring, imminent, or highly likely under that product's criteria. Follow the official protective instructions for your location.

A climate outlook can be above normal without any weather warning, and a serious short-lived hazard can occur during a period that ultimately averages near normal. When a watch or warning exists for your location, it outranks the broad planning signal on an outlook map.