Climate averages 1991–2020

Gresham weather
in January.

A cold, very wet month: the 11th warmest and the 10th driest of the year.

Long-term climate patterns, not a forecast for a particular trip.

Average high 7.5°C Daytime mean, January

Average low 1.1°C Night-time mean, January

Rainfall 220 mm 18 days with ≥1 mm

Daylight 9 h Sunrise to sunset, per day

January is a cold month in Gresham: daytime highs average 7.5°C and nights cool to about 1.1°C. By daytime temperature it is the 11th warmest of the 12 months.

Expect about 220 mm of rain on roughly 18 days, which makes January a very wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 09 min on an average January day.

The nearest other city in this atlas is Portland (19 km away). In January its highs average 8.4°C, 0.9°C warmer than Gresham, with 167 mm of rain.

Among the 498 cities listed in the United States, Gresham ranks joint 284th of 498 for the warmest January highs and 496th of 498 for the driest January (rainfall, lowest first). The mean January high of those 498 cities is 9.5°C; Gresham is 2.0°C cooler than that mean.

From January to February, average highs rise by 1.6°C to 9.1°C, and monthly rainfall falls from 220 mm to 167 mm.

The annual picture

January in context

30-year average

Average highAverage low°C

Monthly rainfall

Average total · mm

Averages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated

Every month, side by side

Gresham climate table

1991–2020

Monthly climate averages for Gresham, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January, selected	7.5°C1.1°C	1.1°C	220	18.3	9.19 h
February	9.1°C1.2°C	1.2°C	167	15.7	10.310 h
March	11.5°C2.4°C	2.4°C	178	18.2	11.912 h
April	14.0°C4.5°C	4.5°C	142	16.6	13.513 h
May	17.8°C7.9°C	7.9°C	89	11.6	14.915 h
June	20.5°C10.6°C	10.6°C	58	9.0	15.616 h
July	25.5°C13.6°C	13.6°C	14	2.9	15.315 h
August	26.1°C13.9°C	13.9°C	20	2.9	14.114 h
September	22.8°C11.3°C	11.3°C	58	6.4	12.613 h
October	16.0°C7.1°C	7.1°C	147	12.9	11.011 h
November	10.2°C3.4°C	3.4°C	230	18.0	9.610 h
December	6.8°C1.0°C	1.0°C	244	18.5	8.89 h

Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.

Compare places

January in nearby cities

Distance from Gresham

Read the numbers correctly

Climate, not a promise.

These patterns help compare months. They cannot tell you the weather on a specific day of your trip.

Sources, method and limits

How these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Gresham) is explained once on the Gresham year overview and on the Sources, method and limits page.