Gresham, Oregon climate: NOAA's gridded normals for the city, beside the nearest station records
NOAA's gridded 1991-2020 normals put Gresham's center at January lows of 36°F and July highs of 81°F, a yearly mean of 53.9°F and 51.2 inches of precipitation. No NOAA station keeps a record under the city's name. The nearest station record, Portland Troutdale Airport (4 miles NE, 29 ft), has January lows of 37°F and July highs of 82°F.
111,507 people (Census Bureau 2024). Distances and directions are from the city's center.
- Jan 47° 36°
- Feb 51° 37°
- Mar 56° 39°
- Apr 61° 42°
- May 69° 48°
- Jun 73° 52°
- Jul 81° 56°
- Aug 82° 56°
- Sep 76° 51°
- Oct 64° 45°
- Nov 52° 40°
- Dec 46° 36°
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 Gresham's center.
What is each month like in Gresham?
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. | Portland Troutdale Airport high | Portland Troutdale Airport low |
|---|---|---|---|---|---|---|
| January | 47°F | 36°F | 41.4°F | 6.93 | 47°F | 37°F |
| February | 51°F | 37°F | 43.6°F | 5.19 | 51°F | 38°F |
| March | 56°F | 39°F | 47.4°F | 5.54 | 57°F | 40°F |
| April | 61°F | 42°F | 51.6°F | 4.39 | 62°F | 43°F |
| May | 69°F | 48°F | 58.0°F | 3.23 | 69°F | 49°F |
| June | 73°F | 52°F | 62.6°F | 2.32 | 74°F | 53°F |
| July | 81°F | 56°F | 68.5°F | 0.60 | 82°F | 57°F |
| August | 82°F | 56°F | 68.6°F | 0.73 | 82°F | 57°F |
| September | 76°F | 51°F | 63.6°F | 1.95 | 76°F | 52°F |
| October | 64°F | 45°F | 54.3°F | 4.83 | 64°F | 46°F |
| November | 52°F | 40°F | 46.2°F | 7.62 | 53°F | 42°F |
| December | 46°F | 36°F | 40.7°F | 7.84 | 46°F | 37°F |
In metric: a yearly mean of 12.2°C, January lows of 2°C, July highs of 27°C and 1,300 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 Gresham 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 |
|---|---|---|---|---|---|---|---|---|
| Portland Troutdale Airport | 4 mi NE | 29 ft | 54.7°F | 37°F | 82°F | 40.7 | – | March 16 |
| PortlandPortland International Airport | 10 mi NW | 19 ft | 55.1°F | 36°F | 82°F | 36.9 | 4 | March 13 |
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 Gresham?
NOAA's grid gives no snow, frost dates or records, so these come from the nearest station record, Portland Troutdale Airport (4 miles NE, 29 ft). NOAA publishes no snowfall normal for it; the nearest record that has one, Portland (10 miles NW), gets 4 inches a year. The last spring frost (32°F) comes after March 16 in half of years and the first autumn frost before November 20. Its record high is 116°F (2021) and its record low 3°F (1950) (kept since 1948).
The USDA's 2023 Plant Hardiness Zone Map puts Gresham in zones 8b to 9a across its 4 ZIP code areas.
Over a year 70% of the sunlight that would reach the ground under clear skies gets through the clouds in the area (3.7 kWh per square metre a day, NASA POWER 2001-2020); July is the sunniest month (83%) and December the cloudiest (52%).
Portland Troutdale Airport'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 Gresham; the nearest record's month pages have them.
Source: NOAA NCEI 1991-2020 normals, station USW00024242; 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 Gresham, ZIP code by ZIP code?
4 ZIP code areas lie wholly or partly in Gresham. On NOAA's grid 97230 is the warmest (54.1°F a year) and 97080 the coolest (53.5°F), a spread of 0.6°F. Each row also names the nearest station record and its frost dates.
| ZIP code | Zone | Year | Jan low | Jul high | Precip. | Nearest record | Last frost | First frost |
|---|---|---|---|---|---|---|---|---|
| 97030 | 9a | 53.9°F | 36°F | 81°F | 51.2 | Portland Troutdale Airport (3 mi) | March 16 | November 20 |
| 97080 | 8b | 53.5°F | 36°F | 81°F | 57.1 | Portland Troutdale Airport (5 mi) | March 16 | November 20 |
| 97230 | 9a | 54.1°F | 36°F | 81°F | 46.2 | Portland Troutdale Airport (5 mi) | March 16 | November 20 |
| 97233 | 9a | 53.9°F | 36°F | 81°F | 45.4 | Portland Troutdale Airport (5 mi) | March 16 | November 20 |
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.