Meridian, Idaho climate: NOAA's gridded normals for the city, beside the nearest station records
NOAA's gridded 1991-2020 normals put Meridian's center at January lows of 24°F and July highs of 93°F, a yearly mean of 52.4°F and 11.6 inches of precipitation. No NOAA station keeps a record under the city's name. The nearest station record, Boise (9 miles E, 2,814 ft), has January lows of 26°F and July highs of 93°F.
139,740 people (Census Bureau 2024). Distances and directions are from the city's center.
- Jan 39° 24°
- Feb 47° 28°
- Mar 57° 33°
- Apr 64° 37°
- May 74° 45°
- Jun 82° 52°
- Jul 93° 59°
- Aug 91° 57°
- Sep 81° 48°
- Oct 66° 38°
- Nov 50° 30°
- Dec 39° 24°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
The months above are NOAA's gridded normals at Meridian's center.
What is each month like in Meridian?
NOAA's grid estimates the normals every 5 km or so from the stations around each point, terrain included. It smooths between stations, so night lows at the heart of a large city can run warmer than the grid shows: at five big-city airports we compared, the grid's highs were within about 1°F of the station and its lows 1-6°F cooler. The nearest record's high and low are beside each month.
| Month | High | Low | Mean | Precip. | Boise high | Boise low |
|---|---|---|---|---|---|---|
| January | 39°F | 24°F | 31.5°F | 1.44 | 39°F | 26°F |
| February | 47°F | 28°F | 37.3°F | 1.03 | 46°F | 29°F |
| March | 57°F | 33°F | 45.3°F | 1.29 | 56°F | 35°F |
| April | 64°F | 37°F | 50.8°F | 1.22 | 62°F | 40°F |
| May | 74°F | 45°F | 59.5°F | 1.42 | 72°F | 48°F |
| June | 82°F | 52°F | 67.0°F | 0.79 | 81°F | 54°F |
| July | 93°F | 59°F | 75.6°F | 0.21 | 93°F | 62°F |
| August | 91°F | 57°F | 73.7°F | 0.16 | 91°F | 61°F |
| September | 81°F | 48°F | 64.4°F | 0.43 | 80°F | 53°F |
| October | 66°F | 38°F | 52.0°F | 0.81 | 65°F | 42°F |
| November | 50°F | 30°F | 39.7°F | 1.21 | 49°F | 32°F |
| December | 39°F | 24°F | 31.7°F | 1.56 | 39°F | 25°F |
In metric: a yearly mean of 11.3°C, January lows of −4°C, July highs of 34°C and 293 mm of precipitation a year.
Source: NOAA NCEI U.S. Monthly Gridded Climate Normals 1991-2020 (nClimGrid, accession 0245564); NOAA NCEI 1991-2020 station normals. The grid cell holding the city's Census center point.
What do the station records around Meridian say?
Each row is a NOAA station's own 1991-2020 normals, with the snow and frost dates the grid does not give. A record downhill or nearer the coast than the city can run warmer, one uphill cooler: compare the elevations.
| Record | Where | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| BoiseBoise Air Terminal | 9 mi E | 2,814 ft | 53.2°F | 26°F | 93°F | 11.5 | 18 | April 24 |
| NampaNampa Sugar Factory | 9 mi W | 2,470 ft | 52.0°F | 23°F | 93°F | 11.0 | 10 | April 29 |
| Emmett2 mi E | 17 mi N | 2,390 ft | 51.5°F | 23°F | 92°F | 13.3 | 7 | April 30 |
Source: NOAA NCEI 1991-2020 U.S. Climate Normals; place center and population: Census Bureau 2024. Last frost: the median last spring date of 32°F.
How much snow, how late a frost, what zone and how much sun in Meridian?
NOAA's grid gives no snow, frost dates or records, so these come from the nearest station record, Boise (9 miles E, 2,814 ft). It gets 18 inches of snow in a normal year. The last spring frost (32°F) comes after April 24 in half of years and the first autumn frost before October 21. Its record high is 111°F (1898) and its record low −28°F (1888), on the National Weather Service's long record for the area (kept since 1875).
The USDA's 2023 Plant Hardiness Zone Map puts Meridian in zone 7a across its 2 ZIP code areas.
Over a year 82% of the sunlight that would reach the ground under clear skies gets through the clouds in the area (4.6 kWh per square metre a day, NASA POWER 2001-2020); July is the sunniest month (92%) and December the cloudiest (62%).
Boise's page has its months, frost probabilities, records by month and recent years. NOAA's grid has monthly figures only, so there are no day-by-day month pages for Meridian; the nearest record's month pages have them.
Source: NOAA NCEI 1991-2020 normals, station USW00024131; records: ACIS; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; sunshine: NASA POWER.
How does the climate vary across Meridian, ZIP code by ZIP code?
2 ZIP code areas lie wholly or partly in Meridian. On NOAA's grid 83642 is the warmest (52.4°F a year) and 83646 the coolest (52.3°F), so the city is nearly uniform. Each row also names the nearest station record and its frost dates.
Source: Census Bureau 2020 ZCTA-to-place relationship file and ZCTA centers; NOAA NCEI gridded and station normals, 1991-2020. A ZIP area counts when at least a tenth of its land (and 0.5 km²) is in the city; its figures are the grid cell at its center; frost dates are the nearest record's medians of 32°F.