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Channel Islands National Park

Daily per-unit climate series from 1980 to 2025, reduced from DAYMET v4 + ERA5-Land over the real PAD-US 4.1 park boundary.

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Annual mean temperature · 1980–2025
Cooler than 1981–2010 baseline Near baseline Warmer than 1981–2010 baseline
19802025

Headline trends

Theil–Sen slope estimates with Mann–Kendall p-values. Trends marked ✓ are statistically significant at the 95% level.

Mean temperature
+0.010°F / yr not sig.
Total +0.43 °F since 1980 · p = 0.226
Maximum temperature
-0.043°F / yr significant
Total -1.92 °F since 1980 · p = 0.043
Minimum temperature
+0.089°F / yr significant
Total +3.99 °F since 1980 · p < 0.001
Precipitation
-1.83mm / yr² not sig.
Total -82.28 mm since 1980 · p = 0.394

Time series & trends

Every variable in the dataset, with its Theil–Sen slope and Mann–Kendall p-value. Click any row to open the annual time series, a 12-month rolling trend (long-term direction without the annual cycle), and a togglable seasonal climatology for three 15-year periods so the shift in seasonal pattern is visible.

Mean temperature +0.010 °F / yr +0.43 p = 0.226 not sig.

Annual mean of daily mean near-surface temperature.

Annual mean temperature (°F) (Theil–Sen)
Long-term trend (12-month rolling)
Seasonal cycle
Maximum temperature -0.043 °F / yr -1.92 p = 0.043 sig.

Annual mean of daily maximum near-surface temperature.

Annual maximum temperature (°F) (Theil–Sen)
Long-term trend (12-month rolling)
Seasonal cycle
Minimum temperature +0.089 °F / yr +3.99 p < 0.001 sig.

Annual mean of daily minimum near-surface temperature.

Annual minimum temperature (°F) (Theil–Sen)
Long-term trend (12-month rolling)
Seasonal cycle
Precipitation -1.83 mm / yr² -82.28 p = 0.394 not sig.

Annual total precipitation.

Annual precipitation (mm / yr) (Theil–Sen)
Long-term trend (12-month rolling)
Seasonal cycle
Actual evapotranspiration -1.86 mm / yr² -83.58 p = 0.088 not sig.

Annual total actual evapotranspiration (ERA5-Land).

Annual actual evapotranspiration (mm / yr) (Theil–Sen)
Long-term trend (12-month rolling)
Seasonal cycle
Potential evapotranspiration -0.14 mm / yr² -6.49 p = 0.970 not sig.

Annual total potential evapotranspiration (ERA5-Land).

Annual potential evapotranspiration (mm / yr) (Theil–Sen)
Long-term trend (12-month rolling)
Seasonal cycle
Snow cover -0.00 % / yr -0.00 p = 0.070 not sig.

Mean daily snow-cover fraction.

Annual snow cover (%) (Theil–Sen)
Long-term trend (12-month rolling)
Seasonal cycle
Snow depth (water-equivalent) 0.00 mm / yr 0.00 p = 0.100 not sig.

Mean daily snow depth expressed as water equivalent.

Annual snow depth (water-equivalent) (mm) (Theil–Sen)
Long-term trend (12-month rolling)
Seasonal cycle
Snowfall (water-equivalent) -0.00 mm / yr² -0.00 p = 0.066 not sig.

Annual total water-equivalent snowfall.

Annual snowfall (water-equivalent) (mm / yr) (Theil–Sen)
Long-term trend (12-month rolling)
Seasonal cycle
Snowmelt -0.00 mm / yr² -0.00 p = 0.031 sig.

Annual total snowmelt.

Annual snowmelt (mm / yr) (Theil–Sen)
Long-term trend (12-month rolling)
Seasonal cycle
Shortwave radiation -0.62 W/m² / yr -27.22 p < 0.001 sig.

Mean daily downwelling shortwave radiation.

Annual shortwave radiation (W/m²) (Theil–Sen)
Long-term trend (12-month rolling)
Seasonal cycle
Snow-water equivalent 0.00 mm / yr 0.00 p = 0.336 not sig.

Mean daily snow-water equivalent.

Annual snow-water equivalent (mm) (Theil–Sen)
Long-term trend (12-month rolling)
Seasonal cycle
Vapour pressure +2.1 Pa / yr +92.69 p = 0.054 not sig.

Mean daily near-surface water-vapour pressure.

Annual vapour pressure (Pa) (Theil–Sen)
Long-term trend (12-month rolling)
Seasonal cycle
Wind speed -0.003 m/s / yr -0.15 p = 0.061 not sig.

Mean daily 10-m wind speed.

Annual wind speed (m/s) (Theil–Sen)
Long-term trend (12-month rolling)
Seasonal cycle

Download the data

Everything is open-licensed (MIT). The first two buttons fetch just this park; the third pulls the bulk daily CSV archive from Zenodo, which contains the raw daily series for all 63 parks (≈150 MB).

JSON · this park Summary JSON Annual + seasonal aggregates, MK / Theil–Sen trends, monthly decomposition, climate stripes. GeoJSON · this park Boundary GeoJSON PAD-US 4.1 proclamation polygon, dissolved, simplified to 50 m, in WGS84. Zenodo · all 63 parks Daily CSVs (bulk, ~150 MB) Raw 1980–2025 daily series for every park, gzipped. Use nps.fetch_daily("channel-islands") if you only want this one — see the Data page.

Cite this park

Britton, A., & Pritchard, I. (2026). Channel Islands National Park climate series, in NPS Open Climate Data v1.0.0 [Data set]. Zenodo. https://doi.org/10.5281/zenodo.19823584