Notes and References
- The specific frequencies of events above were modeled on northern Europe; specifically the Paris Le Bourget airport in June to August. We downloaded daily historical weather data for these months 2001-2009 and computed statistics as above. Paris was chosen as central to battles in the Hundred Years War. Technically, a d8 Event die would be more realistic (1-in-8 heat wave, 2-in-8 thunderstorm), but the d6 was used above for simplicity in play. https://www.wunderground.com/history/
- Frequency of rainy days may be 25-50% in Atlantic region, northern Europe. Heavy rain (> 10mm per day) occurs in eastern United States about 15% of days (1 in 6), Europe somewhat less. Rainy days evidence clustering (suggests roll for multi-day duration, or increased chance next day?). http://www.cgd.ucar.edu/cas/adai/papers/Sun_etal_JC06.pdf
- This short table of middle ages battles shows battles occurring from March to October, with the largest cluster from June to August, which we used as the assumed “adventuring season”: http://www.medieval-life-and-times.info/medieval-history/medieval-battles.htm
- No winter sea travel as given in Unger, Richard W., The Ship in the Medieval Economy 600-1600. (p. 128, 131; but compare to later era on p. 175). If winter sea travel permitted, then weather should also be modified in that season.
- For a translation of a year-long medieval weather record, possibly by Roger Bacon, see the link below (cites C. Long, “The Oldest European Weather Diary?”, Weather, Vol.29:6 (1974) pages 233-237): http://www.medievalists.net/2015/09/a-medieval-weather-report/
- For more exotic weather options reported in medieval times (such as cooked wheat, barley, beans, fruit, fish, snakes, stones, ash, rocks, people, slabs of ice, and blood), see Paul Edward Dutton, “Observations on Early Medieval Weather in General, Bloody Rain in Particular”, The Long Morning of Medieval Europe: New Directions in Early Medieval Studies (Chapter 9) (currently available on Google Books search).