A consolidated reference for Niigata climate: monthly averages, rebuilt from public data on a schedule. Expect 4.7 C at the coldest (Feb) and 26.1 C at the warmest (Aug) — a 21.4 C spread. Expect a wet month and a dry month but no real season: 6.93 mm/day in Dec against 2.73 mm/day in May. Taken together that is roughly 1,696 mm of rain a year for the grid cell. The build runs on a schedule and caches the last good response, so the numbers stay put even when the upstream API is having a bad day. Scroll for the month-by-month figures, or jump to a neighbouring location from the links below.
Annual mean temperature 14.5 C
Warmest month Aug (26.1 C)
Coldest month Feb (4.7 C)
Wettest month Dec (6.93 mm/day)
All-time record high 33.6 C
All-time record low -3.0 C
Annual precipitation 1,701 mm / year
Coordinates 37.92259, 139.04125
Population 797,591
Average monthly temperature and rainfall in Niigata
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
4.9
5.37
13.2
-3.0
Feb
4.7
3.70
15.0
-2.1
Mar
6.6
3.45
15.0
-0.4
Apr
10.4
3.16
21.5
2.6
May
15.4
2.73
26.1
6.2
Jun
19.9
3.75
27.9
13.2
Jul
23.9
6.86
31.8
17.3
Aug
26.1
4.67
33.6
18.9
Sep
23.1
4.70
31.6
15.6
Oct
18.0
4.87
27.2
10.4
Nov
12.8
5.61
21.5
5.2
Dec
7.7
6.93
17.6
-1.0
What the Niigata climate table shows
Values are multi-decadal climatological averages for the 37.92259, 139.04125 grid cell, not a single year. Rain is the daily mean, so a value of 2.00 mm/day is about 60 mm across a 30-day month. Averages smooth over extremes, so use them for planning rather than for what to pack for next Tuesday.
Frequently asked questions
Does Niigata get the same every year?
Close to it. Averaging decades smooths variation, so treat these as typical rather than guaranteed.