Climate averages 1991–2020

Troy weather
in January.

A freezing month with moderate precipitation: the coolest and the 3rd driest of the year.

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

Average high -0.9°C Daytime mean, January

Average low -8.1°C Night-time mean, January

Precipitation 60 mm 10 days with ≥1 mm

Daylight 9 h Sunrise to sunset, per day

January is a freezing month in Troy: daytime highs average -0.9°C and nights cool to about -8.1°C. By daytime temperature it is the coolest month of the year.

Expect about 60 mm of precipitation on roughly 10 days, which makes January a month with moderate precipitation (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 26 min on an average January day.

The nearest other city in this atlas is Rochester Hills (6 km away). In January its highs average -1.0°C, about as warm as Troy, with 59 mm of precipitation.

Among the 498 cities listed in the United States, Troy ranks joint 462nd of 498 for the warmest January highs and joint 165th of 498 for the driest January (precipitation, lowest first). The mean January high of those 498 cities is 9.5°C; Troy is 10.3°C cooler than that mean.

From January to February, average highs rise by 1.4°C to 0.6°C, and monthly precipitation falls from 60 mm to 52 mm.

The annual picture

January in context

30-year average

Average highAverage low°C

Monthly precipitation

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

Troy climate table

1991–2020

Monthly climate averages for Troy, 1991–2020
Month	Average highHigh / low	Average low	Precipitation mm/month	Wet days ≥1 mm/day	Daylight hours/dayDaylight h/day
January, selected	-0.9°C-8.1°C	-8.1°C	60	9.6	9.49 h
February	0.6°C-7.7°C	-7.7°C	52	8.0	10.511 h
March	6.0°C-3.1°C	-3.1°C	61	9.7	11.912 h
April	13.0°C3.4°C	3.4°C	90	12.0	13.313 h
May	19.6°C10.1°C	10.1°C	94	12.7	14.615 h
June	24.8°C15.9°C	15.9°C	94	11.2	15.315 h
July	27.0°C18.5°C	18.5°C	80	11.4	15.015 h
August	25.9°C17.9°C	17.9°C	80	10.2	13.914 h
September	22.1°C14.2°C	14.2°C	70	9.0	12.513 h
October	15.1°C7.9°C	7.9°C	71	9.6	11.111 h
November	7.8°C1.5°C	1.5°C	66	9.3	9.810 h
December	1.9°C-3.9°C	-3.9°C	57	9.2	9.19 h

Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet 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 Troy

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 Troy) is explained once on the Troy year overview and on the Sources, method and limits page.

Southfield lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.