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Before you bring home an orchid, you need to consider the average daytime and nighttime temperatures in summer and winter where you live.

To determine high and low temperatures indoors get a maximum/minimum thermometer that records this information and place it in your growing area. A broad selection of temperature and weather recording instruments are available from home stores, garden centers, or online. I find that a maximum-minimum thermometer (see Figure 2-1) is especially useful to determine your minimum and maximum temperatures for day and night. They’re available in digital or analog.

© John Wiley & Sons, Inc.

FIGURE 2-1: Maximum-minimum thermometer.

For an idea of what your minimum temperatures are outdoors where you live, check out the USDA hardiness map online at https://planthardiness.ars.usda.gov/pages/view-maps. If you’re a weather geek like I am, you can use a recording weather station that reads and records the maximum and minimum temperature, humidity, wind speed, rainfall, and barometric pressure every hour and stores this information so it can be charted. Mine has remote sensors and a wireless connection to my computer.

When you’ve determined the average summer and winter temperatures in your area, turn to Table 2-1, which lists some of the most common types of orchids by temperature requirements. Notice that some orchids are adaptable enough to fit into more than one temperature range. This information is merely a guideline; if you’re off by a few degrees, especially the high degrees during the day during the summer, don’t worry about it. Orchids are adaptable.

TABLE 2-1 Orchid Temperature Preferences

Temperature (Nighttime Minimum)	Genus
Cool (45°F–55°F/7.2°C–12.8°C)	Cymbidium Dendrobium Odontoglossum
Cool (45°F–55°F/7.2°C–12.8°C) to Intermediate (55°F–60°F/12.8°C–15.6°C)	Cymbidium Dendrobium Encyclia Masdevallia Miltoniopsis Zygopetalum
Intermediate (55°F–60°F/12.8°C–15.6°C)	Aerangis Cattleya and hybrids Cymbidium Dendrobium Encyclia Epidendrum Laelia Maxillaria Miltonia Oncidium Paphiopedilum Phragmipedium Vanda Zygopetalum
Intermediate (55°F–60°F/12.8°C–15.6°C) to Warm (65°F/18.3°C or higher)	Aerangis Amesiella Angraecum Brassavola Cattleya Dendrobium Encyclia Epidendrum Neofinetia Neostylis Oncidium Rhynchostylis Vanda Vascostylis
Warm (65°F/18.3°C or higher)	Angraecum Phalaenopsis Vanda

When orchid publications refer to temperature preferences, they almost always mean the evening temperature. The daytime temperature is usually about 15°F (9.5°C) higher than the evening temperature.