What Trowbridge weather does to a conservatory
Each square below is the average room temperature for one hour of one month, worked out from every hour of 2024 and 2025 at Trowbridge's coordinates. Switch between roofs to see the afternoon block of amber and plum shrink. Outside, July averaged 17.6°C and the warmest hour reached 31.6°C; inside a shut polycarbonate room the model's hottest hour was 48°C.
A year inside a Trowbridge conservatory
Average room temperature, every month and hour of 2024 and 2025
- 1,337
- hours over 25°C
- 48°C
- hottest hour
- 34°C
- July, 3pm
- 1,491
- hours over 25°C
- 51°C
- hottest hour
- 36°C
- July, 3pm
- 328
- hours over 25°C
- 35°C
- hottest hour
- 25°C
- July, 3pm
Blue: heater weatherPale: comfortableAmber to plum: too warm
The hours you get back
A heater can rescue a chilly hour. Nothing cheap rescues a 31°C one. So the useful measure is how many waking hours stay at or under 25°C: in Trowbridge that is 3,776 a year under polycarbonate and 4,786 under an insulated panel roof, roughly 1,010 hours handed back.
The worst hours, above 30°C, fall from 592 to 40. A glass roof manages 741.
- Polycarbonate roof1,337 h too warm
- Glass roof1,491 h too warm
- Panel roof328 h too warm
Too cold (under 12°C)Chilly (12 to 17°C)Comfortable (17 to 25°C)Warm (25 to 28°C)Too hot (over 28°C)
When the heat peaks in Trowbridge
July is the problem month here: 49% of its waking hours top 28°C under polycarbonate, 10% under panels. Spring and early autumn matter too, when the sun is still strong but nobody expects to open the doors.
Polycarbonate roofInsulated panel roof
Winter in Trowbridge
Winter here bottoms out in January at an average of 4.2°C (coldest hour -5.2°C). Keeping 19°C while the room is in use costs about £407 a year in electricity under polycarbonate and £352 under the panel roof, 1,547 against 1,339 kWh.
We would not sell the roof on that difference alone. The glass walls keep losing heat either way; what changes most is that the room stops cooking in summer and a smaller heater copes in winter.
Prices for Trowbridge conservatory roofs
We price Trowbridge roofs on size and shape only, so the guide below holds anywhere in West Country. The survey is free and the written price is fixed. See the price page for every shape, or get a guide price for your roof in about a minute.
| Shape | Small (up to 12 m²) | Medium (12 to 25 m²) | Large (over 25 m²) |
|---|---|---|---|
| Lean-to | from £3,000 | from £4,000 | from £5,000 |
| Edwardian | from £3,150 | from £4,200 | from £5,250 |
| Victorian | from £3,300 | from £4,400 | from £5,500 |
Fitting day
Plan on a single day for most Trowbridge roofs, usually a second for a P-shape. We take the old roof away the same day and leave the room swept. The fitting day walks through it hour by hour.
Towns near Trowbridge
Compare your neighbours, or see all of the West Country and the full overheating league table.