Potato in Portsmouth: weekly temperatures and windows
Detailed weekly chart for this crop and place. For planting dates, see when to plant potato in Portsmouth.
Growing window for Potato: Mar 17 – Nov 10 (239 days)
Planting window for Potato: Mar 17 – Aug 9 (146 days)
Usually too cold: Jan 1 – Mar 15; Nov 16 – Dec 31
Outdoors: weekly temperatures and windows
Temperatures across the year for Portsmouth. Shaded bands are this plant’s ideal and tolerable daytime air ranges. Growing is daytime air suitability; Planting is sow / plant-out conditions (same colour language). Window brackets mark each stretch.
- Ideal range
- Tolerable range
- Possible min to max
- Average min to max
- Suitable
- Tolerable
- Too cold
- Too hot
Selected week · tap a week or use the arrows
Week 12 · Mar 16 – Mar 22
Average 5 to 11 °C · Possible −2 to 17 °C
Growing: too cold (inside window)
Planting: suitable
A week is in range when its average low and high sit inside the tolerance band 7 to 30 °C; it is suitable when that average range also overlaps the ideal 15 to 24 °C band and possible readings stay within 7 °C to 30 °C. Crossing a possible limit, or missing the ideal band, makes it tolerable; a possible low below 7 °C makes it tolerable. When a sowing window is calculated, weeks outside that window are uncoloured even if air is in range.
Based on average frost dates (35 seasons (1991–2025)).
- Ideal
- Tolerable
- Too cold
- Too hot
Show all 53 weeks
Cover method weekly charts
Outdoor weekly chart is above. Open a cover chart only if you grow under fleece, a cold frame, or an unheated greenhouse.
Dates for Portsmouth use ERA5-Land cell 50.80, -1.09. How we calculated this · Algorithm 2026-10-season-10.