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Blenheim, New Zealand

Full City Profile

2.1 /5.0
C Fair
30,300 Population 755/sq mi density
30 ft Elevation 9 meters
56°F Avg Temperature 13°C
C
Overall
2.1 / 5.0
Fair overall score based on economy, affordability, safety and education
C+
Economy
2.7 / 5.0
$21,480 median income, 4.7% unemployment
F
Affordability
1.5 / 5.0
$197,600 home value, $988/mo rent
Blenheim enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 63°F in January while summers reach 47°F in July. The area gets 298 sunny days per year. Annual precipitation totals 29.5 inches. The area receives 0.7 inches of snow annually.

Temperature

63°F Jan (17°C) 47°F Jul (8°C)
Annual Average55.6°F
3% above US avg
January Average63°F (17°C)
July Average47°F (8°C)
Sunny Days298 days/yr

Geography

Elevation30 ft (9 m)
Area40.1 sq mi (103.9 km²)
Population Density755/sq mi
Coordinates-41.5160°N, 173.9528°W
TimezonePacific/Auckland

Precipitation & Snow

Annual Rainfall 29.5"
22% below US avg
Snowfall 0.7"
Wettest Month (Aug) 3.70"
Driest Month (Feb) 2.13"

Air Quality

Earthquake History

1,157 earthquakes (M2.5+) within 150 km since 1990. Strongest: M6.5. Most recent: M4.3 on Aug 30, 2025.

Jul 21, 2013 38 km ESE of Blenheim, New Zealand M6.5 38 km
Aug 16, 2013 29 km SE of Blenheim, New Zealand M6.5 29 km
Apr 24, 2015 73 km S of Wakefield, New Zealand M6.1 99 km
May 27, 1992 21 km WSW of Blenheim, New Zealand M6.0 22 km
Feb 10, 1990 90 km N of Amberley, New Zealand M6.0 133 km
Jul 20, 2013 38 km ESE of Blenheim, New Zealand M5.9 39 km
Aug 16, 2013 26 km SSE of Blenheim, New Zealand M5.9 26 km
Aug 16, 2013 30 km ESE of Blenheim, New Zealand M5.9 31 km
Mar 22, 1995 27 km N of Picton, New Zealand M5.8 53 km
Feb 15, 2023 55 km NW of Raumati Beach, New Zealand M5.7 118 km
Feb 10, 1990 90 km N of Amberley, New Zealand M5.7 145 km
Oct 4, 1990 25 km SE of Brooklyn, New Zealand M5.6 84 km
Jul 18, 2013 38 km E of Blenheim, New Zealand M5.5 38 km
Oct 6, 1990 24 km SW of Waipawa, New Zealand M5.5 116 km
Aug 16, 2013 30 km SSE of Blenheim, New Zealand M5.5 31 km
Aug 16, 2013 25 km SSE of Blenheim, New Zealand M5.4 25 km
Jan 5, 2017 36 km SSE of Blenheim, New Zealand M5.4 37 km
Jan 20, 2005 16 km SE of Upper Hutt, New Zealand M5.3 110 km
Jul 21, 2013 34 km E of Blenheim, New Zealand M5.3 35 km
Aug 17, 2013 29 km SSE of Blenheim, New Zealand M5.2 29 km
Source: USGS (M2.5+, 1990–2025)

Tsunami History

4 tsunamis recorded within 500 km. Highest wave on record: 11.0 m (36 ft).

Year Location Cause Max Wave Deaths Distance
1855 NORTHERN ISLAND Earthquake 11.0 m — 92 km
2013 WELLINGTON Earthquake 0.1 m — 29 km
2013 COOK STRAIT Earthquake 0.1 m — 38 km
1855 WHARANUI Earthquake — — 47 km
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.

Monthly Weather

Month Avg Temperature Precipitation Summary
January 63°F (17°C) 3.1 in Warmest
February 63°F (17°C) 2.1 in Driest
March 60°F (16°C) 3.4 in
April 55°F (13°C) 2.8 in
May 50°F (10°C) 3.4 in
June 45°F (7°C) 2.8 in Coldest
July 47°F (8°C) 3.4 in
August 46°F (8°C) 3.7 in Wettest
September 50°F (10°C) 3.0 in
October 53°F (12°C) 3.6 in
November 57°F (14°C) 3.4 in
December 60°F (16°C) 3.3 in

Blenheim has a seasonal temperature swing of 18°F / from 45°F in June to 63°F in January. Total annual precipitation is 38.1 inches, with August being the wettest month (3.7") and February the driest (2.1").

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