{ "slug": "san-diego-ca", "place": { "name": "San Diego", "state": "CA", "census_name": "San Diego city", "census_geoid": "0666000", "lat": 32.81498, "lon": -117.13556, "station_distance_km": 10.1 }, "station": { "id": "USW00023188", "name": "SAN DIEGO LINDBERGH FLD, CA US", "lat": 32.7336, "lon": -117.1831, "elevation_m": 4.6, "elevation_ft": 15, "source_urls": { "monthly": "https://www.ncei.noaa.gov/data/normals-monthly/1991-2020/access/USW00023188.csv", "annual": "https://www.ncei.noaa.gov/data/normals-annualseasonal/1991-2020/access/USW00023188.csv" } }, "period": "1991-2020", "units": { "temperature": "F", "precipitation": "in", "snowfall": "in", "days": "days", "dates": "MM-DD", "prob_low_le_32f_pct": "percent" }, "months": [ { "month": 1, "name": "January", "high_f": 66.4, "low_f": 50.3, "mean_f": 58.4, "precip_in": 1.98, "snow_in": null, "days_precip_ge_0_01in": 6.5, "days_precip_ge_0_10in": 4.0, "days_snow_ge_1_0in": null, "days_high_ge_90f": 0.0, "days_high_le_32f": 0.0, "days_low_le_32f": 0.0, "prob_low_le_32f_pct": 0.0 }, { "month": 2, "name": "February", "high_f": 66.2, "low_f": 51.8, "mean_f": 59.0, "precip_in": 2.2, "snow_in": null, "days_precip_ge_0_01in": 7.1, "days_precip_ge_0_10in": 4.1, "days_snow_ge_1_0in": null, "days_high_ge_90f": 0.0, "days_high_le_32f": 0.0, "days_low_le_32f": 0.0, "prob_low_le_32f_pct": 0.0 }, { "month": 3, "name": "March", "high_f": 67.0, "low_f": 54.5, "mean_f": 60.7, "precip_in": 1.46, "snow_in": null, "days_precip_ge_0_01in": 6.2, "days_precip_ge_0_10in": 3.1, "days_snow_ge_1_0in": null, "days_high_ge_90f": 0.1, "days_high_le_32f": 0.0, "days_low_le_32f": 0.0, "prob_low_le_32f_pct": 0.0 }, { "month": 4, "name": "April", "high_f": 68.8, "low_f": 57.1, "mean_f": 62.9, "precip_in": 0.65, "snow_in": null, "days_precip_ge_0_01in": 3.8, "days_precip_ge_0_10in": 1.7, "days_snow_ge_1_0in": null, "days_high_ge_90f": 0.2, "days_high_le_32f": 0.0, "days_low_le_32f": 0.0, "prob_low_le_32f_pct": 0.0 }, { "month": 5, "name": "May", "high_f": 69.5, "low_f": 60.0, "mean_f": 64.8, "precip_in": 0.28, "snow_in": null, "days_precip_ge_0_01in": 2.2, "days_precip_ge_0_10in": 0.7, "days_snow_ge_1_0in": null, "days_high_ge_90f": 0.3, "days_high_le_32f": 0.0, "days_low_le_32f": 0.0, "prob_low_le_32f_pct": 0.0 }, { "month": 6, "name": "June", "high_f": 71.7, "low_f": 62.6, "mean_f": 67.2, "precip_in": 0.05, "snow_in": null, "days_precip_ge_0_01in": 0.7, "days_precip_ge_0_10in": 0.1, "days_snow_ge_1_0in": null, "days_high_ge_90f": 0.1, "days_high_le_32f": 0.0, "days_low_le_32f": 0.0, "prob_low_le_32f_pct": 0.0 }, { "month": 7, "name": "July", "high_f": 75.3, "low_f": 66.1, "mean_f": 70.7, "precip_in": 0.08, "snow_in": null, "days_precip_ge_0_01in": 0.7, "days_precip_ge_0_10in": 0.1, "days_snow_ge_1_0in": null, "days_high_ge_90f": 0.1, "days_high_le_32f": 0.0, "days_low_le_32f": 0.0, "prob_low_le_32f_pct": 0.0 }, { "month": 8, "name": "August", "high_f": 77.3, "low_f": 67.5, "mean_f": 72.4, "precip_in": 0.01, "snow_in": null, "days_precip_ge_0_01in": 0.3, "days_precip_ge_0_10in": 0.0, "days_snow_ge_1_0in": null, "days_high_ge_90f": 0.3, "days_high_le_32f": 0.0, "days_low_le_32f": 0.0, "prob_low_le_32f_pct": 0.0 }, { "month": 9, "name": "September", "high_f": 77.2, "low_f": 66.2, "mean_f": 71.7, "precip_in": 0.12, "snow_in": null, "days_precip_ge_0_01in": 0.9, "days_precip_ge_0_10in": 0.2, "days_snow_ge_1_0in": null, "days_high_ge_90f": 0.9, "days_high_le_32f": 0.0, "days_low_le_32f": 0.0, "prob_low_le_32f_pct": 0.0 }, { "month": 10, "name": "October", "high_f": 74.6, "low_f": 61.5, "mean_f": 68.1, "precip_in": 0.5, "snow_in": null, "days_precip_ge_0_01in": 2.4, "days_precip_ge_0_10in": 1.1, "days_snow_ge_1_0in": null, "days_high_ge_90f": 0.8, "days_high_le_32f": 0.0, "days_low_le_32f": 0.0, "prob_low_le_32f_pct": 0.0 }, { "month": 11, "name": "November", "high_f": 70.7, "low_f": 54.8, "mean_f": 62.7, "precip_in": 0.79, "snow_in": null, "days_precip_ge_0_01in": 3.7, "days_precip_ge_0_10in": 1.9, "days_snow_ge_1_0in": null, "days_high_ge_90f": 0.3, "days_high_le_32f": 0.0, "days_low_le_32f": 0.0, "prob_low_le_32f_pct": 0.0 }, { "month": 12, "name": "December", "high_f": 66.0, "low_f": 49.8, "mean_f": 57.9, "precip_in": 1.67, "snow_in": null, "days_precip_ge_0_01in": 5.8, "days_precip_ge_0_10in": 3.1, "days_snow_ge_1_0in": null, "days_high_ge_90f": 0.0, "days_high_le_32f": 0.0, "days_low_le_32f": 0.0, "prob_low_le_32f_pct": 0.0 } ], "annual": { "high_f": 70.9, "low_f": 58.5, "mean_f": 64.7, "precip_in": 9.79, "snow_in": null, "days_precip_ge_0_01in": 40.3, "days_snow_ge_1_0in": null, "days_high_ge_90f": 3.0, "days_high_le_32f": 0.0, "days_low_le_32f": 0.0 }, "frost": { "semantics": { "last_spring": "PRBLST: an N% chance that the last night at or below the threshold comes on or after this date", "first_fall": "PRBFST: an N% chance that the first night at or below the threshold has come by this date", "season_days": "PRBGSL: length of the season above the threshold, days; P50 is the median" }, "thresholds_f": [ 36, 32, 28, 24, 20, 16 ], "probabilities_pct": [ 10, 20, 30, 40, 50, 60, 70, 80, 90 ], "table": { "36": { "status": "no_freeze_typical_year", "freeze_in_most_years": false, "last_spring": { "10": null, "20": null, "30": null, "40": null, "50": null, "60": null, "70": null, "80": null, "90": null }, "first_fall": { "10": null, "20": null, "30": null, "40": null, "50": null, "60": null, "70": null, "80": null, "90": null }, "season_days": { "10": 365.0, "20": 365.0, "30": 365.0, "40": 365.0, "50": 365.0, "60": 365.0, "70": 365.0, "80": 365.0, "90": 365.0 } }, "32": { "status": "no_freeze_typical_year", "freeze_in_most_years": false, "last_spring": { "10": null, "20": null, "30": null, "40": null, "50": null, "60": null, "70": null, "80": null, "90": null }, "first_fall": { "10": null, "20": null, "30": null, "40": null, "50": null, "60": null, "70": null, "80": null, "90": null }, "season_days": { "10": 365.0, "20": 365.0, "30": 365.0, "40": 365.0, "50": 365.0, "60": 365.0, "70": 365.0, "80": 365.0, "90": 365.0 } }, "28": { "status": "no_freeze_typical_year", "freeze_in_most_years": false, "last_spring": { "10": null, "20": null, "30": null, "40": null, "50": null, "60": null, "70": null, "80": null, "90": null }, "first_fall": { "10": null, "20": null, "30": null, "40": null, "50": null, "60": null, "70": null, "80": null, "90": null }, "season_days": { "10": 365.0, "20": 365.0, "30": 365.0, "40": 365.0, "50": 365.0, "60": 365.0, "70": 365.0, "80": 365.0, "90": 365.0 } }, "24": { "status": "no_freeze_typical_year", "freeze_in_most_years": false, "last_spring": { "10": null, "20": null, "30": null, "40": null, "50": null, "60": null, "70": null, "80": null, "90": null }, "first_fall": { "10": null, "20": null, "30": null, "40": null, "50": null, "60": null, "70": null, "80": null, "90": null }, "season_days": { "10": 365.0, "20": 365.0, "30": 365.0, "40": 365.0, "50": 365.0, "60": 365.0, "70": 365.0, "80": 365.0, "90": 365.0 } }, "20": { "status": "no_freeze_typical_year", "freeze_in_most_years": false, "last_spring": { "10": null, "20": null, "30": null, "40": null, "50": null, "60": null, "70": null, "80": null, "90": null }, "first_fall": { "10": null, "20": null, "30": null, "40": null, "50": null, "60": null, "70": null, "80": null, "90": null }, "season_days": { "10": 365.0, "20": 365.0, "30": 365.0, "40": 365.0, "50": 365.0, "60": 365.0, "70": 365.0, "80": 365.0, "90": 365.0 } }, "16": { "status": "no_freeze_typical_year", "freeze_in_most_years": false, "last_spring": { "10": null, "20": null, "30": null, "40": null, "50": null, "60": null, "70": null, "80": null, "90": null }, "first_fall": { "10": null, "20": null, "30": null, "40": null, "50": null, "60": null, "70": null, "80": null, "90": null }, "season_days": { "10": 365.0, "20": 365.0, "30": 365.0, "40": 365.0, "50": 365.0, "60": 365.0, "70": 365.0, "80": 365.0, "90": 365.0 } } }, "notes": [ "T16: null cells carry NCEI flags ['Y']", "T20: null cells carry NCEI flags ['Y']", "T24: null cells carry NCEI flags ['Y']", "T28: null cells carry NCEI flags ['Y']", "T32: null cells carry NCEI flags ['Y']", "T36: null cells carry NCEI flags ['Y']" ] }, "derived": { "hottest_month": { "month": 8, "name": "August", "value": 72.4 }, "coldest_month": { "month": 12, "name": "December", "value": 57.9 }, "hottest_month_by_high": { "month": 8, "name": "August", "value": 77.3 }, "wettest_month": { "month": 2, "name": "February", "value": 2.2 }, "driest_month": { "month": 8, "name": "August", "value": 0.01 }, "snowiest_month": null, "winter": "mild", "summer": "mild", "precipitation": "arid", "snow": "no data", "annual_precip_in": 9.79, "annual_snow_in": null, "annual_range_f": 14.5, "mean_daily_range_f": 12.4, "months_high_ge_90f": [], "months_low_le_32f": [], "last_spring_32f_p50": null, "first_fall_32f_p50": null, "freeze_free_days_p50": 365.0, "freeze_free_span_days_p50": null }, "rules": { "hottest_coldest_month": "by monthly mean temperature (MLY-TAVG-NORMAL); ties go to the earlier month", "wettest_driest_month": "by monthly precipitation normal (MLY-PRCP-NORMAL); ties go to the earlier month", "winter": { "basis": "mean temperature of the coldest month, F", "bands": [ [ null, 20, "very cold" ], [ 20, 32, "cold" ], [ 32, 45, "cool" ], [ 45, 60, "mild" ], [ 60, null, "warm" ] ] }, "summer": { "basis": "mean daily high of the hottest month (by high), F", "bands": [ [ null, 70, "cool" ], [ 70, 80, "mild" ], [ 80, 90, "warm" ], [ 90, 100, "hot" ], [ 100, null, "very hot" ] ] }, "precipitation": { "basis": "annual precipitation normal, inches (sum of months if no annual value)", "bands": [ [ null, 10, "arid" ], [ 10, 20, "semi-arid" ], [ 20, 40, "moderate" ], [ 40, 60, "wet" ], [ 60, null, "very wet" ] ] }, "snow": { "basis": "annual snowfall normal, inches; 'no data' when NOAA publishes no snowfall normal", "bands": [ [ null, 1, "rare or none" ], [ 1, 12, "light" ], [ 12, 36, "moderate" ], [ 36, 72, "heavy" ], [ 72, null, "very heavy" ] ] }, "bands": "lower bound inclusive, upper bound exclusive", "frost_free": "true when the 32F last-spring and first-fall P50 dates are -9999 with flag Y (insufficient values) and the 32F growing season P50 is 365 days or the annual number of nights at or below 32F rounds to 0.0", "freeze_free_days_p50": "NOAA ANN-TMIN-PRBGSL-T32FP50 (median length of the 32F freeze-free season), as published", "freeze_rare": "true when 32F dates are published but the 32F growing season P50 is 365 days: no 32F night in at least half of years; the P50 spring and fall dates then cross and freeze_free_span_days_p50 is null", "freeze_free_span_days_p50": "days from the 32F P50 last-spring date to the 32F P50 first-fall date (next year if the fall date is earlier in the calendar); differs from the NOAA median season length because a median of lengths is not the span between median dates" }, "flags": { "frost_free": true, "freeze_rare": false, "frost_data_missing": false, "year_round_frost_risk": false, "snow_normal_absent": true, "incomplete_months": [ "days_snow_ge_1_0in", "snow_in" ] }, "quality": { "high_f": { "column": "MLY-TMAX-NORMAL", "absent": false, "comp_flags": [ "R", "S" ], "meas_flags": [], "years_min": 22, "missing_months": 0 }, "low_f": { "column": "MLY-TMIN-NORMAL", "absent": false, "comp_flags": [ "S" ], "meas_flags": [], "years_min": 27, "missing_months": 0 }, "mean_f": { "column": "MLY-TAVG-NORMAL", "absent": false, "comp_flags": [ "R", "S" ], "meas_flags": [], "years_min": 22, "missing_months": 0 }, "precip_in": { "column": "MLY-PRCP-NORMAL", "absent": false, "comp_flags": [ "S" ], "meas_flags": [], "years_min": 29, "missing_months": 0 }, "snow_in": { "column": "MLY-SNOW-NORMAL", "absent": true, "comp_flags": [], "meas_flags": [], "years_min": null, "missing_months": 12 }, "days_precip_ge_0_01in": { "column": "MLY-PRCP-AVGNDS-GE001HI", "absent": false, "comp_flags": [ "S" ], "meas_flags": [], "years_min": 30, "missing_months": 0 }, "days_precip_ge_0_10in": { "column": "MLY-PRCP-AVGNDS-GE010HI", "absent": false, "comp_flags": [ "S" ], "meas_flags": [], "years_min": 30, "missing_months": 0 }, "days_snow_ge_1_0in": { "column": "MLY-SNOW-AVGNDS-GE010TI", "absent": true, "comp_flags": [], "meas_flags": [], "years_min": null, "missing_months": 12 }, "days_high_ge_90f": { "column": "MLY-TMAX-AVGNDS-GRTH090", "absent": false, "comp_flags": [ "R", "S" ], "meas_flags": [ "X" ], "years_min": 22, "missing_months": 0 }, "days_high_le_32f": { "column": "MLY-TMAX-AVGNDS-LSTH032", "absent": false, "comp_flags": [ "R", "S" ], "meas_flags": [], "years_min": 22, "missing_months": 0 }, "days_low_le_32f": { "column": "MLY-TMIN-AVGNDS-LSTH032", "absent": false, "comp_flags": [ "S" ], "meas_flags": [], "years_min": 27, "missing_months": 0 }, "prob_low_le_32f_pct": { "column": "MLY-TMIN-PRBOCC-LSTH032", "absent": false, "comp_flags": [ "S" ], "meas_flags": [], "years_min": 27, "missing_months": 0 } }, "citation": { "monthly": "Palecki, Michael; Durre, Imke; Applequist, Scott; Arguez, Anthony; Lawrimore, Jay (2021). U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991-2020). Station USW00023188 (SAN DIEGO LINDBERGH FLD, CA US). NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/wck8-er13. Accessed 2026-10-09.", "annual": "Palecki, Michael; Durre, Imke; Applequist, Scott; Arguez, Anthony; Lawrimore, Jay (2021). U.S. Climate Normals 2020: U.S. Annual/Seasonal Climate Normals (1991-2020). Station USW00023188 (SAN DIEGO LINDBERGH FLD, CA US). NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/4ek7-fk11. Accessed 2026-10-09.", "metadata_records": [ "https://www.ncei.noaa.gov/access/metadata/landing-page/bin/iso?id=gov.noaa.ncdc:C01620", "https://www.ncei.noaa.gov/access/metadata/landing-page/bin/iso?id=gov.noaa.ncdc:C01619" ] }, "retrieved": { "monthly": "2026-10-09", "annual": "2026-10-09" } }