Hamilton climate — normals and trends
Hamilton (New Zealand) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 14.0 °C and it receives 1,266 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is February (19.0 °C on average) and the coldest is July (9.1 °C). Rainfall peaks in July.
Hamilton averages 10 frost days, 0 hot days (≥ 30 °C) and 145 rainy days per year.
Hamilton has warmed by +1.9 °C between 1940 and 2025, or +0.23 °C per decade. This trend is statistically significant.
The number of frost days there went from about 13 to 7 per year over the period.
The hottest day of the period reached 30.7 °C (on 11 March 1955) and the coldest -5.8 °C (on 13 July 1965).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
HamiltonWaikato Region
- coords
- -37.78°, 175.28°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
14.0°C
Average daily high
18.0°C
Average daily low
9.8°C
Annual rainfall
1,266mm
Sunshine / day
9.3h
Mean relative humidity
80%
Average peak wind
20.9km/h
Seasonal range
9.9°C
Frost days (< 0 °C)
10 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
145 d/yr
Annual snowfall
0.0 cm
Average feels-like high
16.7 °C
Average feels-like low
8.0 °C
Average peak gust
38.9 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
14.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °C
since 1940
+0.2 °C per decade · r² = 0.60 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
30.7 °C
11 March 1955
Coldest day
-5.8 °C
13 July 1965
Wettest day
106 mm
20 April 1985
Windiest day
59.4 km/h
10 April 1968
Strongest gust
113.8 km/h
6 September 1995
Hottest feels-like
34.4 °C
28 January 1956
Coldest feels-like
-9.8 °C
9 August 1965
Snowiest day
0.7 cm
27 June 1951
Sunniest day
14.6 h
24 December 2024
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 23.3 °C | +0.6 °C | 62 mm | -17 mm |
| Feb | 25.4 °C | +2.1 °C | 36 mm | -42 mm |
| Mar | 23.6 °C | +1.9 °C | 27 mm | -53 mm |
| Apr | 21.0 °C | +2.0 °C | 125 mm | +29 mm |
| May | 17.7 °C | +1.6 °C | 96 mm | -14 mm |
| Jun | 15.6 °C | +1.7 °C | 159 mm | +39 mm |
| Jul | 14.8 °C | +1.6 °C | 206 mm | +75 mm |
| Aug | 14.4 °C | +0.5 °C | 110 mm | -20 mm |
| Sep | 16.4 °C | +1.1 °C | 129 mm | +13 mm |
| Oct | 18.4 °C | +1.5 °C | 147 mm | +30 mm |
| Nov | 21.9 °C | +3.1 °C | 152 mm | +52 mm |
| Dec | 22.8 °C | +1.9 °C | 98 mm | -11 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Hamilton?
Hamilton has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 14.0 °C and it receives 1,266 mm of precipitation per year.
What is the hottest day ever recorded in Hamilton?
The hottest day measured in Hamilton between 1940 and 2025 was 11 March 1955, reaching 30.7 °C.
What is the coldest day in Hamilton?
The coldest day measured in Hamilton between 1940 and 2025 was 13 July 1965, at -5.8 °C.
Does it snow in Hamilton?
Almost never: Hamilton sees virtually no snow, with about 10 frost days per year.
Has the climate of Hamilton warmed?
Yes: Hamilton warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Hamilton?
The wettest day measured in Hamilton between 1940 and 2025 was 20 April 1985, with 106 mm of rain in 24 hours.
What was the windiest day in Hamilton?
The windiest day measured in Hamilton between 1940 and 2025 was 10 April 1968, with winds reaching 59.4 km/h.
What is the warmest month in Hamilton?
The warmest month in Hamilton is February (19.0 °C on average); the coldest is July (9.1 °C).
How much does it rain in Hamilton?
Hamilton receives on average 1,266 mm of precipitation per year, spread over about 145 rainy days.
Is it sunny in Hamilton?
Hamilton gets on average 9.3 hours of sunshine per day, roughly 3,395 hours per year over 1940-2025.
What is the biggest single-day snowfall in Hamilton?
The heaviest 24-hour snowfall measured in Hamilton between 1940 and 2025 was 27 June 1951, with 0.7 cm.
Are there tropical nights in Hamilton?
Yes: Hamilton has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Hamilton?
In Hamilton, between 1940 and 2025, the highest apparent temperature reached 34.4 °C on 28 January 1956, and the lowest was -9.8 °C on 9 August 1965.
Compare Hamilton with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Hamilton