Hot steppe to hot desert
‘Yoeme Purple String’ beans have long been cultivated by the Pascua Yaqui Tribe of Southern Arizona. Areas associated with the Tribe include New Pascua and Old Pascua (Tucson area,) Barrio Libre (South Tucson,) Marana (northwest of Tucson,) and Guadalupe (in the Phoenix-Tempe area.) (3, 10) In terms of climate, these areas range from a hot steppe climate to a hot desert climate very similar to Las Vegas, Nevada’s.
Here are some southern Arizona climate factors to bear in mind, and how they compare to our local climate:
*Please note –
Bold = Regional climate info associated with ‘Yoeme purple string’ bean
Italics = Las Vegas area climate info
Steppe climates and desert climates are both dry overall. One factor that separates them is the seasonal timing of precipitation occurrences. Steppe climates (BS) can be defined as dry climates with 50% or more of the total annual precipitation generally occurring in the spring and summer months (April-September in the Northern Hemisphere;) whereas desert climates are dry climates with less than 50% of annual precipitation occurring in spring and summer.
In the Las Vegas area, the desert climate pattern prevails. ‘Yoeme purple string’ beans are well-adapted to such a climate, as well as to the steppe climate where spring and/or summer are generally the wettest seasons by a significant margin. If your ‘Yoeme Purple String’ bean plants seem to be suffering in our dry warm- and hot-season weather, then providing more steppe-like growing conditions (additional water) might help. Late springtime in the steppe climates of Arizona is somewhat wetter than late spring in Las Vegas, and summer is significantly wetter.
The steppe climates in Southern Arizona are influenced by the prevalence of the summer monsoon pattern there. This influence lessens farther north in the hot desert climate areas associated with the Pascua Yaqui Tribe, and lessens even more so farther north in the Las Vegas, Nevada area.
The Southern Arizona steppe and desert climates are hot in the summer.
Summers in Las Vegas tend to fall between the hot steppe and hot desert summers of Southern Arizona in terms of heat. July temperatures have historically averaged around 87 degrees F in the Tucson area (hot steppe), around 88.9 F in Las Vegas (hot desert,) and around 90.7 F in the Tempe area (hot desert.) If ‘Yoeme purple string’ bean plants are suffering in a summer garden in the Las Vegas area, it may help to take steps to moderate the temperature in the area immediately surrounding them, to bring the area closer to a hot steppe environment. However, compared to many other crops, the beans should be very well-adapted to our climate.
1 “Arizona” article, Wikipedia
2 “Climate: Arizona” page, Climate-Data.org https://en.climate-data.org/region/922/
3 “Pascua Yaqui Tribe” article, Wikipedia. https://en.wikipedia.org/wiki/Pascua_Yaqui_Tribe
4 “Climate: Tempe” page, Climate-Data.org https://en.climate-data.org/location/1428/
5 “When to plant vegetables in Nogales, AZ.” The National Gardening Association website, Tools & Apps.
6 Kruse-Peeples, Melissa and Sheryl Joy. “ABC’s of Monsoon Planting.” Native Seeds/SEARCH.
7 “Semi-arid climate” article, Wikipedia.
8 “Climate: Nogales” page, Climate-Data.org
9 “Climate: Tucson” page, Climate-Data.org
10 Pascua Yaqui Tribe page, Inter Tribal Council of Arizona website.
11 “Köppen climate classification” article, Wikipedia.