US state heating/cooling degree-day panel, monthly (NOAA nClimDiv)

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Monthly US state heating/cooling degree-day panel (base 65F), 1895-01 onward for the 48 contiguous states and 1925-01 onward for Alaska, from NOAA NCEI's nClimDiv v1.0.0 statewide files (keyless, U.S. federal public domain). One row per state x month: monthly HDD, CDD and total degree days; 1991-2020 normal and anomaly vs normal; year-on-year change; anomaly vs the trailing 10-year same-month mean; heating/cooling season flags; documented 0-100 heating/cooling demand scores (percentile of the state's own calendar-month history); cold-snap / heat-wave month flags at the 90th percentile. Upstream gaps are honest nulls, never imputed: Alaska's statewide record (050) is entirely the upstream -9999. missing marker (verified 2026-09-30, 1925-2026), so every AK value column is null; Hawaii has no statewide record in these files. NCEI aggregate records (codes 101-110, 121-124) are excluded by design. Join keys: year_month, state_code, country_code=USA. Who joins this: Shopify apparel/home/energy shops drive seasonal demand forecasts and promo timing off the demand scores; subscription businesses use cold-snap/heat-wave months as churn-risk features; sales teams rank territories by seasonal demand intensity.

Source: US State Degree Days (NOAA nClimDiv, keyless)
Rows: 77,060
Columns: 24
Source cadence: Monthly
Last refreshed: Sep 30, 2026
Theme: economics

Column	Type	Description
month	date	First day of the calendar month. (unit: date)
year_month	string	Calendar month as YYYY-MM (panel join key). (unit: string)
state_code	string	2-letter postal state code (panel join key). (unit: string)
state_name	string	State name. (unit: string)
country	string	Country name (shared normalization layer). (unit: string)
country_code	string	ISO 3166-1 alpha-3 country code (USA). (unit: string)
hdd	float	Monthly heating degree days, base 65F, statewide mean from NOAA nClimDiv v1.0.0 (degree-days). Null is an honest upstream gap (Alaska's statewide record is entirely missing upstream), never imputed. (unit: degree-days)
cdd	float	Monthly cooling degree days, base 65F, statewide mean from NOAA nClimDiv v1.0.0 (degree-days). Null is an honest upstream gap (Alaska's statewide record is entirely missing upstream), never imputed. (unit: degree-days)
total_dd	float	hdd + cdd (degree-days); null only when both components are missing. (unit: degree-days)
hdd_normal	float	1991-2020 climate normal for monthly HDD (record 0032 of the nClimDiv normals file; degree-days). Null for Alaska — NCEI publishes no usable normals for it in these files. (unit: degree-days)
cdd_normal	float	1991-2020 climate normal for monthly CDD (record 0032 of the nClimDiv normals file; degree-days). Null for Alaska — NCEI publishes no usable normals for it in these files. (unit: degree-days)
hdd_anomaly_vs_normal	float	hdd minus the 1991-2020 normal for that calendar month (degree-days); positive = colder than normal. Null for Alaska (no upstream normal). (unit: degree-days)
cdd_anomaly_vs_normal	float	cdd minus the 1991-2020 normal for that calendar month (degree-days); positive = hotter than normal. Null for Alaska (no upstream normal). (unit: degree-days)
hdd_yoy	float	Change in HDD versus the same month one year earlier (degree-days). (unit: degree-days)
cdd_yoy	float	Change in CDD versus the same month one year earlier (degree-days). (unit: degree-days)
hdd_anomaly_vs_10y	float	hdd minus the trailing 10-year mean of the same calendar month (minimum 5 prior years, current month excluded; degree-days). (unit: degree-days)
cdd_anomaly_vs_10y	float	cdd minus the trailing 10-year mean of the same calendar month (minimum 5 prior years, current month excluded; degree-days). (unit: degree-days)
heating_season_flag	boolean	True for October-March (heating season). (unit: boolean)
cooling_season_flag	boolean	True for June-August (cooling season). (unit: boolean)
heating_demand_score	float	0-100 percentile rank of the month's HDD within the state's own calendar-month history (minimum 10 observations): a documented seasonal heating-demand gauge, not a forecast. (unit: score 0-100)
cooling_demand_score	float	0-100 percentile rank of the month's CDD within the state's own calendar-month history (minimum 10 observations): a documented seasonal cooling-demand gauge, not a forecast. (unit: score 0-100)
cold_snap_month	boolean	True when the month's HDD is at or above the 90th percentile of the state's calendar-month history (minimum 10 observations). (unit: boolean)
heat_wave_month	boolean	True when the month's CDD is at or above the 90th percentile of the state's calendar-month history (minimum 10 observations). (unit: boolean)
row_hash	string	Deterministic 16-hex sha256 of state_code + year_month + hdd + cdd (idempotency key). (unit: string)

First 10 sample rows — a preview, not the complete dataset.

month	year_month	state_code	state_name	country	country_code	hdd	cdd	total_dd	hdd_normal	cdd_normal	hdd_anomaly_vs_normal	cdd_anomaly_vs_normal	hdd_yoy	cdd_yoy	hdd_anomaly_vs_10y	cdd_anomaly_vs_10y	heating_season_flag	cooling_season_flag	heating_demand_score	cooling_demand_score	cold_snap_month	heat_wave_month	row_hash
1895-01-01T00:00:00	1895-01	AL	Alabama	United States	USA	717	5	722	662	12	55	-7	—	—	—	—	true	false	70.455	39.015	false	false	f2be86db56175275
1895-02-01T00:00:00	1895-02	AL	Alabama	United States	USA	800	0	800	518	6	282	-6	—	—	—	—	true	false	100	5.303	true	false	bd28d35397c2dc74
1895-03-01T00:00:00	1895-03	AL	Alabama	United States	USA	373	18	391	359	25	14	-7	—	—	—	—	true	false	59.848	42.424	false	false	8c8c2f3b1df95d9f
1895-04-01T00:00:00	1895-04	AL	Alabama	United States	USA	115	49	164	132	47	-17	2	—	—	—	—	false	false	40.909	59.091	false	false	af3896b56dd8eb65
1895-05-01T00:00:00	1895-05	AL	Alabama	United States	USA	34	155	189	28	187	6	-32	—	—	—	—	false	false	68.561	31.061	false	false	3e0e12128e660539
1895-06-01T00:00:00	1895-06	AL	Alabama	United States	USA	0	359	359	0	363	0	-4	—	—	—	—	false	true	45.076	48.864	false	false	1541364fbade7ea4
1895-07-01T00:00:00	1895-07	AL	Alabama	United States	USA	0	419	419	0	452	0	-33	—	—	—	—	false	true	50.379	24.242	true	false	80b3d2ed6692bcd8
1895-08-01T00:00:00	1895-08	AL	Alabama	United States	USA	0	437	437	0	435	0	2	—	—	—	—	false	true	50	53.409	true	false	cdfd426ec75cc2af
1895-09-01T00:00:00	1895-09	AL	Alabama	United States	USA	0	365	365	6	281	-6	84	—	—	—	—	false	false	9.16	89.695	false	true	578ff96e214dfeef
1895-10-01T00:00:00	1895-10	AL	Alabama	United States	USA	234	28	262	131	77	103	-49	—	—	—	—	true	false	96.947	5.725	true	false	64e938b79905738c

Profiled Oct 1, 2026 from snapshot 20260930T171959Z-bfaa380a6bcb

Measured

Completeness: 98.6%
Rows: 77,060
Columns: 24
Columns with gaps: 15

Rows per yearmonth · 1895–2026 · 132 years

18952026

Column	Missing	Distinct	Range	Distribution
monthtimestamp	0%	1,467	Jan 1, 1895 → Aug 1, 2026	—
year_monthvarchar	0%	1,471	—	1925-0149 1925-0249 1925-0349
state_codevarchar	0%	53	—	AL1,580 AR1,580 AZ1,580
state_namevarchar	0%	55	—	Alabama1,580 Arizona1,580 Arkansas1,580
countryvarchar	0%	1	—	United States77,060
country_codevarchar	0%	1	—	USA77,060
hdddouble	1.6%	2,187	0 → 2,389median 343	758 outside 1st–99th percentile
cdddouble	1.6%	743	0 → 844median 8	752 outside 1st–99th percentile
total_dddouble	1.6%	2,096	106 → 2,389median 426	1,480 outside 1st–99th percentile
hdd_normaldouble	1.6%	457	0 → 1,819median 365	658 outside 1st–99th percentile
cdd_normaldouble	1.6%	204	0 → 654median 10	660 outside 1st–99th percentile
hdd_anomaly_vs_normaldouble	1.6%	905	-584 → 711median -2	1,503 outside 1st–99th percentile
cdd_anomaly_vs_normaldouble	1.6%	345	-219 → 297median 0	1,503 outside 1st–99th percentile
hdd_yoydouble	2.3%	1,171	-803 → 1,039median 0	1,499 outside 1st–99th percentile
cdd_yoydouble	2.3%	535	-319 → 346median 0	1,489 outside 1st–99th percentile
hdd_anomaly_vs_10ydouble	5.3%	15,270	-533.7 → 842.9median -0.7	1,458 outside 1st–99th percentile
cdd_anomaly_vs_10ydouble	5.3%	6,179	-221.1 → 270.17median 0	1,458 outside 1st–99th percentile
heating_season_flagboolean	0%	2	—	false38,579 true38,481
cooling_season_flagboolean	0%	2	—	false57,746 true19,314
heating_demand_scoredouble	1.6%	500	0.7576 → 100median 50.38	1,670 outside 1st–99th percentile
cooling_demand_scoredouble	1.6%	500	0.7576 → 100median 50.38	1,579 outside 1st–99th percentile
cold_snap_monthboolean	1.6%	2	—	false63,850 true11,990
heat_wave_monthboolean	1.6%	2	—	false44,686 true31,154
row_hashvarchar	0%	76,581	—	00010c231767e7051 000121c873d3dd0a1 0001b97fd405247a1

Point any LLM at the metadata endpoint — the documentation above is machine-readable too (JSON-LD + Croissant).

cURL

curl "https://datazimuts.com/v1/datasets/noaa_nclimdiv_degree_days_intel/us_state_degree_days_monthly" | jq '{title, rows, columns_count, license}'

Python

import requests

ds = requests.get("https://datazimuts.com/v1/datasets/noaa_nclimdiv_degree_days_intel/us_state_degree_days_monthly").json()
print(ds["title"], ds["rows"], "rows")

# Sample rows for an LLM context window
for row in ds.get("sample_rows", [])[:5]:
    print(row)

API endpoint: https://datazimuts.com/v1/datasets/noaa_nclimdiv_degree_days_intel/us_state_degree_days_monthly

Tip: fetch /llms.txt for the full machine-readable catalog.

Cite this snapshot

Pinned to snapshot 20260930T171959Z-bfaa380a6bcb and its content hash, so readers get exactly the data you used.

APA

US State Degree Days (NOAA nClimDiv, keyless). (2026). US state heating/cooling degree-day panel, monthly (NOAA nClimDiv) [Data set, snapshot 20260930T171959Z-bfaa380a6bcb, sha256 bfaa380a6bcb]. Datazimuts. Retrieved 2026-10-01, from https://datazimuts.com/en/datasets/noaa_nclimdiv_degree_days_intel/us_state_degree_days_monthly?snapshot=20260930T171959Z-bfaa380a6bcb

BibTeX

@misc{dz_noaa_nclimdiv_degree_days_intel_us_state_bfaa380a,
  title        = {{US state heating/cooling degree-day panel, monthly (NOAA nClimDiv)}},
  author       = {{US State Degree Days (NOAA nClimDiv, keyless)}},
  year         = {2026},
  publisher    = {Datazimuts},
  howpublished = {\url{https://datazimuts.com/en/datasets/noaa_nclimdiv_degree_days_intel/us_state_degree_days_monthly?snapshot=20260930T171959Z-bfaa380a6bcb}},
  note         = {Snapshot 20260930T171959Z-bfaa380a6bcb, sha256 bfaa380a6bcbb38eaf407195d0185a2a759470ca6ecc7f288956802be7093370; accessed 2026-10-01}
}

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US state heating/cooling degree-day panel, monthly (NOAA nClimDiv)

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