Fava bean in Chicago: weekly temperatures and windows
Detailed weekly chart for this crop and place. For planting dates, see when to plant fava bean in Chicago.
Growing window for Fava bean: Mar 21 – Jun 11 (83 days)
Planting window for Fava bean: Mar 21 – Jun 28 (100 days)
Usually too cold: Nov 9 – Dec 31
Outdoors: weekly temperatures and windows
Temperatures across the year for Chicago. 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 0 to 7 °C · Possible −11 to 25 °C
Growing: too cold
Planting: too cold
A week is in range when its average low and high sit inside the tolerance band 4 to 24 °C; it is suitable when that average range also overlaps the ideal 15 to 21 °C band and possible readings stay within 4 °C to 24 °C. Crossing a possible limit, or missing the ideal band, makes it tolerable; a possible low below 4 °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 Chicago use ERA5-Land cell 41.88, -87.68. How we calculated this · Algorithm 2026-10-season-10.