Afternoon heat in New Hartley trails that of 89% of UK towns
The depth of winter brings overnight lows near 2.0°C (36°F). A year here swings 17°C from midwinter lows to midsummer highs. By frosts alone, it ranks gentler than 86% of UK towns. Plan time outside from July to September, when highs sit at 17–19°C.
Met Office 1991–2020 averages for the town itself.
A year in New Hartley at a glance
Each month’s typical high and low, in °C.
What a year in New Hartley feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 655 mm of rain a year
November is the wettest month and March the driest. About 14 days a year bring 10 mm (0.4 in) or more.
Rain by month
Millimetres
29 air frosts and 1 days of 25°C a year
On about 29 nights a year the air drops below freezing; days that stay below freezing are rare. About 1 days a year reach 25°C (77°F).
Day counts are 1991–2020 averages from the Met Office’s 2 km grid. The Met Office calls a day of 25°C or more a summer day and a night below 0°C an air frost; ground frosts, on grass, come more often.
The Met Office station at Durham
Durham is 22 miles south of New Hartley, 102 m (335 ft) above sea level. It is the nearest of the 37 long-running stations the Met Office publishes in full.
| Month | High | Low | Rain | Air frosts |
|---|---|---|---|---|
| January | 6.9°C | 1.3°C | 53 mm | 10.3 |
| February | 7.8°C | 1.4°C | 46 mm | 9.8 |
| March | 9.9°C | 2.5°C | 41 mm | 6.5 |
| April | 12.5°C | 4.1°C | 51 mm | 3.2 |
| May | 15.4°C | 6.5°C | 45 mm | 0.8 |
| June | 18.0°C | 9.3°C | 61 mm | 0.0 |
| July | 20.2°C | 11.3°C | 61 mm | 0.0 |
| August | 19.9°C | 11.3°C | 67 mm | 0.0 |
| September | 17.4°C | 9.2°C | 57 mm | 0.0 |
| October | 13.5°C | 6.5°C | 63 mm | 1.2 |
| November | 9.7°C | 3.6°C | 76 mm | 4.6 |
| December | 7.1°C | 1.4°C | 61 mm | 10.4 |
| Year | 13.2°C | 5.7°C | 681 mm | 47 |
Met Office historic station data, Durham, 1991–2020 months averaged (a month needs 20 of the 30 years; estimated values counted, missing months left out). Sunshine: Campbell-Stokes recorder.
How New Hartley compares
Against the 2,537 towns and cities of 2,500 or more across the UK, each with its own Met Office averages, and its place among Northumberland towns that size.
Nearby towns’ climate
The nearest towns of 1,000+ within 12 miles: a hill, a valley or the sea can make a real difference over a few miles.
| Town | July high | January low | Rain a year |
|---|---|---|---|
| New Hartley | 19.2°C | 2.0°C | 655 mm |
| Seaton Delaval 0.9 mi | 19.2°C about the same | 1.9°C about the same | 655 mm |
| Seghill 1.8 mi | 19.6°C about the same | 1.7°C about the same | 663 mm |
| Seaton Sluice 1.9 mi | 19.2°C about the same | 2.1°C about the same | 655 mm |
| Cramlington 2.3 mi | 19.5°C about the same | 1.7°C about the same | 679 mm |
| Blyth 2.4 mi | 19.6°C about the same | 2.3°C about the same | 656 mm |
| Dudley 3.2 mi | 19.7°C 0.5°C warmer | 1.6°C about the same | 683 mm |
New Hartley weather by month
Average daily high and low, mean temperature and rain, 1991–2020, for the town itself (the Met Office’s HadUK-Grid).
| Month | High | Low | Mean | Rain |
|---|---|---|---|---|
| January | 7.2°C 45°F | 2.0°C 36°F | 4.6°C | 49 mm 1.9 in |
| February | 7.9°C 46°F | 2.3°C 36°F | 5.1°C | 46 mm 1.8 in |
| March | 9.7°C 49°F | 3.0°C 37°F | 6.4°C | 39 mm 1.5 in |
| April | 11.6°C 53°F | 4.3°C 40°F | 8.0°C | 46 mm 1.8 in |
| May | 14.1°C 57°F | 6.6°C 44°F | 10.4°C | 41 mm 1.6 in |
| June | 16.8°C 62°F | 9.3°C 49°F | 13.1°C | 58 mm 2.3 in |
| July | 19.2°C 67°F | 11.3°C 52°F | 15.3°C | 55 mm 2.2 in |
| August | 19.2°C 66°F | 11.5°C 53°F | 15.3°C | 72 mm 2.8 in |
| September | 17.0°C 63°F | 9.9°C 50°F | 13.5°C | 54 mm 2.1 in |
| October | 13.6°C 56°F | 7.4°C 45°F | 10.5°C | 64 mm 2.5 in |
| November | 10.1°C 50°F | 4.7°C 40°F | 7.4°C | 76 mm 3.0 in |
| December | 7.7°C 46°F | 2.4°C 36°F | 5.1°C | 56 mm 2.2 in |
| Year | 12.8°C | 6.2°C | 9.5°C | 655 mm |
Where New Hartley’s numbers come from
Averages over 30 years, not a forecast.
- Mean temperature, rain and day counts: HadUK-Grid 1991–2020 averages for the Met Office 2 km grid square nearest New Hartley’s centre (the town is smaller than one square).
- Highs and lows: the Met Office publishes average daily maxima and minima on its 12 km grid; each is moved by the difference between the town’s 2 km mean temperature and the 12 km square’s, which carries the town’s own height and setting over.
- Weather station and sunshine: Met Office historic station data for Durham, 22 miles away, months of 1991–2020 averaged.
- Comparisons: every town and city of 2,500 or more across the UK, all four nations, read the same way.
Met Office HadUK-Grid · Met Office Climate Data Portal · Historic station data. Open Government Licence v3.0.
Questions about New Hartley’s climate
How warm does New Hartley get in summer?
July is the warmest month, with average highs of 19.2°C (67°F). About 1 days a year reach 25°C (77°F), fewer than 97% of UK towns.
How cold does New Hartley get in winter?
January nights average 2.0°C (36°F). The air drops below freezing on about 29 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does New Hartley get?
About 655 mm (26 in) a year, less than 78% of UK towns. November is the wettest month (76 mm) and March the driest (39 mm).
Where do these figures come from?
The Met Office’s HadUK-Grid 1991–2020 averages, which turn thousands of weather stations into a map of the UK in 2 km squares; the page reads the squares inside New Hartley. They are 30-year averages, not a forecast.
Contains Met Office data © Crown copyright 2026, Open Government Licence v3.0. HadUK-Grid 1991–2020 averages via the Met Office Climate Data Portal; station averages from Met Office historic station data. Today’s forecast for New Hartley →
Contains public sector information licensed under the Open Government Licence v3.0. Contains HM Land Registry data © Crown copyright and database right 2026. Contains OS data © Crown copyright and database right 2026 (ONS boundaries). Northern Ireland: Source: NISRA; contains Land & Property Services data and Ordnance Survey of Northern Ireland information, © Crown copyright, licensed under the Open Government Licence v3.0. Scotland: contains National Records of Scotland data, Registers of Scotland data and SEPA data, © Crown copyright / © SEPA 2025, licensed under the Open Government Licence v3.0.