Last updated: March 2, 2024
Under the Köppen–Geiger climate classification New Plymouth features a cold semi-arid climate (BSk). Temperatures typically range between 0 °C (33 °F) and 28 °C (83 °F) through the year, but rarely can drop to -26 °C (-14 °F) or can rise to as high as 43 °C (110 °F). The average annual precipitation amounts to about 340 mm (13.4 inches) and receives 68 rainy days on the 1 mm (0.04 inches) threshold annually. New Plymouth enjoys an average of 3227 hours of sunshine throughout the year, and daylight varies from 8 hours 56 minutes to 15 hours 24 minutes per day.
The warmest months in New Plymouth are June, July and August, with daily mean temperatures ranging from 22 to 28 °C (72 - 83 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 0 to 2 °C (33 - 36 °F) throughout the day. On average each year, New Plymouth experiences 102 days above 25 °C (77.0 °F) and 82 days below 0 °C (32.0 °F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum | 14°C (57°F) |
16°C (62°F) |
26°C (79°F) |
32°C (91°F) |
37°C (99°F) |
42°C (107°F) |
42°C (108°F) |
43°C (110°F) |
39°C (103°F) |
30°C (86°F) |
24°C (76°F) |
15°C (59°F) |
| Mean maximum | 10°C (51°F) |
14°C (57°F) |
22°C (72°F) |
28°C (82°F) |
33°C (91°F) |
34°C (94°F) |
41°C (105°F) |
41°C (106°F) |
37°C (99°F) |
26°C (80°F) |
19°C (67°F) |
12°C (54°F) |
| Average high | 4°C (39°F) |
7°C (44°F) |
14°C (57°F) |
18°C (65°F) |
23°C (74°F) |
29°C (84°F) |
36°C (96°F) |
34°C (94°F) |
28°C (82°F) |
18°C (64°F) |
11°C (51°F) |
4°C (40°F) |
| Daily mean | 0°C (33°F) |
2°C (36°F) |
8°C (46°F) |
11°C (53°F) |
17°C (62°F) |
22°C (72°F) |
28°C (83°F) |
27°C (80°F) |
20°C (69°F) |
12°C (53°F) |
6°C (42°F) |
1°C (34°F) |
| Average low | -3°C (27°F) |
-2°C (29°F) |
2°C (37°F) |
5°C (42°F) |
10°C (50°F) |
14°C (58°F) |
19°C (66°F) |
18°C (65°F) |
13°C (55°F) |
6°C (43°F) |
1°C (34°F) |
-2°C (28°F) |
| Mean minimum | -13°C (8°F) |
-9°C (15°F) |
-4°C (25°F) |
-1°C (31°F) |
3°C (38°F) |
8°C (47°F) |
14°C (57°F) |
12°C (54°F) |
6°C (42°F) |
-2°C (28°F) |
-5°C (24°F) |
-9°C (17°F) |
| Minimum | -26°C (-14°F) |
-11°C (12°F) |
-7°C (19°F) |
-2°C (28°F) |
1°C (34°F) |
7°C (45°F) |
10°C (51°F) |
10°C (50°F) |
4°C (40°F) |
-10°C (15°F) |
-6°C (21°F) |
-11°C (13°F) |
Compare temperature, precipitation, sunshine, UV index in New Plymouth, Idaho, United States with other places around the world.
New Plymouth usually has the most precipitation in January, February and March, with an average of 9 rainy days and 48 mm (1.9 inches) of precipitation per month. The driest months in New Plymouth are July, August and September. On average, 7 mm (0.3 inches) of precipitation falls during these months.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average precipitation mm (inches) | 48 (1.9) | 55 (2.2) | 41 (1.6) | 31 (1.2) | 34 (1.3) | 19 (0.8) | 1 (0.0) | 8 (0.3) | 12 (0.5) | 20 (0.8) | 35 (1.4) | 37 (1.5) |
| Average precipitation days (≥ 1 mm) | 10 | 10 | 9 | 7 | 6 | 4 | 0 | 1 | 2 | 3 | 7 | 9 |
The sunniest months in New Plymouth are June, July and August, when the sun shines an average of 12 hours 15 minutes a day. Least sunny months in New Plymouth: January, February and December receive an average of 5 hours 2 minutes of sunshine daily.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean monthly sunshine hours | 129 | 170 | 253 | 292 | 341 | 369 | 400 | 357 | 306 | 250 | 197 | 159 |
| Mean daily daylight hours | 9h 18m | 10h 29m | 11h 58m | 13h 29m | 14h 46m | 15h 24m | 15h 3m | 13h 54m | 12h 26m | 10h 56m | 9h 36m | 8h 56m |
New Plymouth experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure. January, February and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 4. For more detailed information, check out our hourly New Plymouth UV Index data.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV Index (month maximum) | 3 | 4 | 6 | 7 | 10 | 11 | 10 | 9 | 8 | 5 | 4 | 2 |
Discover in-depth weather details for every month in New Plymouth. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about New Plymouth's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.
Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.