Idaho Climate – June 2026 Update
Top 5 Cities: Boise, Meridian, Nampa, Idaho Falls, and Pocatello
This month in numbers
Idaho experienced a warmer-than-average start to summer, with June 2026 recording an average temperature of 14.39°C, an anomaly of +0.3°C compared to the 1961–1990 baseline. This ranked as the 30th warmest June in 77 years of records. Maximum temperatures in June were also above average at 22.28°C, ranking 29th. Globally, June 2026 was the 3rd warmest June on record for land temperatures, with an anomaly of +1°C.
What changed
Looking at the broader picture, the April–June 2026 period saw an average temperature of 10.63°C, marking it as the 14th warmest such period on record, with an anomaly of +1.2°C. Maximum temperatures for this three-month span were even more notable, ranking 12th warmest at 18.3°C, an anomaly of +1.9°C. This trend of warmer conditions aligns with the long-term warming trend for Idaho, which has seen an increase of +1.05°C compared to the 1961–1990 baseline. Idaho's 12-month rolling anomaly places it as the 18th warmest out of 234 regions globally, indicating a significant warming trend compared to many other areas.
What’s driving change?
The current climate patterns in Idaho are significantly influenced by a strengthening El Niño. The NOAA ONI for April-June 2026 shows a weak El Niño, with a weekly Niño 3.4 SST anomaly of +1.8°C as of July 1, 2026. Forecasts indicate a 100% probability of El Niño continuing through the end of the year, with predictions of it becoming "very strong". Historically, El Niño typically brings warmer and drier conditions to the Pacific Northwest, including Idaho, during winter months, leading to lower mountain snowpack and increased summer wildfire risk. This aligns with the current situation, as Idaho has experienced an unusual concentration of wildfire activity, with four wildfire events occurring between June 27 and July 13, representing 100% of the annual total for the past 12 months. Additionally, a significant flood event, accompanied by a rare hailstorm, struck the Treasure Valley on June 26, 2026, causing widespread damage and prompting emergency declarations. More information on extreme weather can be found at Extreme Weather tracker and on the evolving ENSO phase at ENSO.
Generated by Gemini from climate data and web sources
At a Glance
Temperature – Average
Climate Map – USA
Source: NOAA Climate at a Glance — US states & climate regions (tavg, pcp). Anomalies are vs the 1961–1990 baseline (temperature) or 1991–2020 (rainfall). See methodology.
Year-on-Year Trends
The 4byo Climate Helix – Idaho
Data: NOAA National Centers for Environmental Information. Baseline: first 30 yrs on record. Recent: last 10 yrs on record.
Idaho – Monthly Temperature – All Years
Data: NOAA National Centers for Environmental Information. Baseline: first 30 yrs on record. Recent: last 10 yrs on record.
Records – Idaho
NOAA National Centers for Environmental Information - Anomalies vs 1901-2000 mean
Shifting Seasons
Warm/cold + wet/dryKöppen Dsb · ContinentalIdaho has both a clear warm/cold cycle (±11.9°C) and a wet/dry cycle (5× wet:dry ratio). Both sides of the annual rhythm are shown below.
Monthly rainfall climatology. A “wet month” exceeds the baseline monthly mean (dashed gold line). Biggest month-to-month shift: Jan (-22 mm, -25%).
Data: NOAA National Centers for Environmental Information. Baseline: first 30 yrs on record. Recent: last 10 yrs on record.
Rainfall & Precipitation
Rainfall & Rain Days – Totals
Climate Systems
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Emissions & Energy
Explore
Explore Climate Data
Data Sources
Data Sources for Idaho
Every figure on this page is sourced from official, openly published climate datasets. Anomalies are calculated against the 1961–1990 baseline (temperature) and 1991–2020 (rainfall, sunshine, frost) - see the Methodology & Sources page for the complete dataset list and update calendar.
FAQs
FAQs
How is the climate in Idaho changing?
Idaho is warming in line with the rest of the world. The page above shows the latest monthly temperature anomaly versus the 1961-1990 baseline, the long-term annual trend, and the region's rank in the historical record. The headline panel also shows the long-term trend rate per decade and the warmest and coolest years on file.
Where does the climate data for Idaho come from?
Climate data for Idaho comes from NOAA Climate at a Glance (temperature and precipitation), refreshed every month, when the upstream temperature and rainfall data are refreshed.
What is the climate baseline used on this page?
Anomalies on this page are calculated against the 1961-1990 climatological baseline, which is the standard reference period used by the Met Office, NOAA, IPCC and most national climate services. Some panels also show the source-native 1901-2000 (NOAA) or 1991-2020 (WMO) baselines for verification. See Methodology & Sources for the full reference.
Which areas does the Idaho climate data cover?
The Idaho climate profile covers Boise, Meridian, Nampa, Idaho Falls and surrounding areas. Idaho climate data from NOAA Climate at a Glance
How often is the Idaho climate update refreshed?
The Idaho climate update is refreshed monthly, typically a few days after the previous month closes and the upstream provider (Met Office HadUK-Grid, NOAA Climate at a Glance, Copernicus ERA5 or the Global Carbon Project) publishes its update. See the Climate Rankings for cross-region comparisons.