New Hampshire Climate – June 2026 Update
Top 5 Cities: Manchester, Nashua, Concord, Dover, and Rochester
This month in numbers
New Hampshire experienced its 9th warmest June on record, with an average temperature of 18°C, an anomaly of +1.5°C compared to the 1961–1990 baseline. Maximum temperatures for June also ranked 13th highest at 24.94°C, an increase of +1.6°C above the baseline. Globally, June 2026 was the 3rd warmest June on record for land temperatures, with an anomaly of +1°C. The three-month period from April to June 2026 also saw above-average temperatures, ranking as the 13th warmest on record for New Hampshire.
What changed
The past three months (April–June 2026) in New Hampshire were notably warmer, with an average temperature of 12.15°C, an anomaly of +1.1°C. This trend aligns with the broader national and global picture, as global land temperatures for the same period ranked as the 2nd warmest on record. New Hampshire's one-month anomaly places it 92nd out of 234 regions globally, indicating a significant warming trend compared to many other areas.
What’s driving change?
The persistent warmth in New Hampshire is largely influenced by the ongoing El Niño event, which is currently weak but forecast to strengthen through the summer and into the autumn and winter of 2026. El Niño typically brings warmer-than-average conditions to the Northeast USA during winter, and forecasts suggest it will contribute to a hotter summer with increased heatwave risk and higher humidity for New Hampshire. This increased moisture in the atmosphere can also lead to greater precipitation and a higher risk of flooding. New Hampshire has recently experienced an unusual concentration of extreme weather events, with four wildfires occurring between late June and early July, representing 100% of the annual total for the past 12 months. Additionally, a significant flood event in Madison, New Hampshire, in mid-June, which closed multiple roads, also represents 100% of the annual total for floods in the past 12 months, indicating an unusual concentration of such events for the region and season. You can track these events and more at Extreme Weather tracker.
Looking ahead
The strengthening El Niño is expected to continue influencing New Hampshire's weather in the coming months, likely leading to more frequent and longer-lasting heat waves and higher humidity through late summer and into the autumn.
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 – New Hampshire
Data: NOAA National Centers for Environmental Information. Baseline: first 30 yrs on record. Recent: last 10 yrs on record.
New Hampshire – Monthly Temperature – All Years
Data: NOAA National Centers for Environmental Information. Baseline: first 30 yrs on record. Recent: last 10 yrs on record.
Records – New Hampshire
NOAA National Centers for Environmental Information - Anomalies vs 1901-2000 mean
Shifting Seasons
Warm / cold seasonsKöppen Dfb · ContinentalHow spring and autumn have shifted in New Hampshire. Spring is defined as the date monthly temperatures first rise above the long-term annual mean (5.8°C, from 1950–1979); autumn is the date they fall back below it. Temperature swings 27.4°C peak-to-peak across the year - a classic four-seasons rhythm.
Baseline vs recent monthly temperature climatology. Biggest warming: Feb (+2.8°C).
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
Emissions & Energy
Explore
Explore Climate Data
Data Sources
Data Sources for New Hampshire
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 New Hampshire changing?
New Hampshire 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 New Hampshire come from?
Climate data for New Hampshire 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 New Hampshire climate data cover?
The New Hampshire climate profile covers Manchester, Nashua, Concord, Dover and surrounding areas. New Hampshire climate data from NOAA Climate at a Glance
How often is the New Hampshire climate update refreshed?
The New Hampshire 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.