High temperaturesForecast day 1
2.7°Ftypical miss
0°3°F8°+
65% came within 3°F
Usually coolerUsually warmer0.4°F cooler than observed
Local temperature forecast performance
How accurate are temperature forecasts in Santa Ana, California?
Nighttime lows were less predictable than daytime highs in Santa Ana's next-day record. Lows missed by 3.3°F on average, compared with 2.7°F for highs.
See the current Santa Ana forecast
Opens ZIP 92701 using the nearest current station, which may differ from the archive station below.
What stands out
Santa Ana forecast findings
- The strongest monthly directional tendency appeared in September highs, when forecasts averaged 2.4°F cooler than observed.
- Error increased more quickly for daily high forecasts. From forecast day 1 to day 7, their typical miss grew by 1.3°F; day-7 errors reached 4.0°F for highs and 3.5°F for lows.
- On forecast day 1, August lows had the smallest typical miss (1.7°F), while January lows had the largest (4.8°F).
- Across days 1, 3, 5, and 7, Santa Ana was close to the national archive average, with less than 0.2°F separating them.
At a glance
Forecast day 1 accuracy
Highs Lows
Close to the national average
Santa Ana: 3.4°F typical miss National archive average: 3.5°F
Combined high and low results across forecast days 1, 3, 5, and 7.Low temperaturesForecast day 1
3.3°Ftypical miss
0°3°F8°+
53% came within 3°F
Usually coolerUsually warmerLittle warm or cool tendency
Error generally grows farther into the forecast
The dots show the typical miss on each forecast day.
See within-3°F percentages and window timing
Day 1High: 65%Low: 53%
Day 3High: 55%Low: 53%
Day 5High: 55%Low: 52%
Day 7High: 51%Low: 55%
High and low windows represent the same numbered forecast day, but the high window ends 12 hours later and therefore has 12 more hours of lead time.
How forecasts change through the year
Each tile is forecast day 1’s typical miss.
Under 2°F2–3°F3–5°FOver 5°FNot enough data
Forecasts ran coolerLittle tendencyForecasts ran warmer
High temperatures
Jan3.1°60 cases
Feb2.5°49 cases
Mar2.8°50 cases
Apr2.3°30 cases
May2.5°54 cases
Jun2.1°54 cases
Jul2.5°56 cases
Aug2.6°49 cases
Sep3.7°50 cases
Oct3.5°59 cases
Nov2.5°47 cases
Dec3.1°51 cases
Low temperatures
Jan4.8°60 cases
Feb4.5°49 cases
Mar3.4°46 cases
Apr3.2°52 cases
May3.1°57 cases
Jun2.6°53 cases
Jul2.3°56 cases
Aug1.7°29 cases
Sep2.2°50 cases
Oct3.8°60 cases
Nov3.5°49 cases
Dec4.3°52 cases
Data locationLOS ALAMITOS AAF (SLI)11.7 miles from central Santa Ana · Archive 2024-08-01–2026-07-28
Based on archived raw NBM forecasts compared with observed daily highs and lows near Santa Ana. Results describe this model archive, not every forecast provider.
How these numbers are calculated
The forecasts are raw NBM median temperature guidance initialized at 12Z. Results include multiple NBM model eras and are retrospective, so they describe this archive rather than guaranteeing future performance.
“Typical miss” is mean absolute error: the average size of the error regardless of direction. Warmer or cooler tendency is signed bias, which can be small even when individual errors are larger.