WEATHER
HEAT INDEX °F (°C)
| RELATIVE HUMIDITY (%) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| TEMP.°F (°C) | 40 | 45 | 50 | 55 | 60 | 65 | 70 | 75 | 80 |
| 100 (38) | 109 (43) | 114 (46) | 118 (48) | 124 (51) | 129 (54) | 136 (58) | |||
| 98 (37) | 105 (41) | 109 (43) | 113 (45) | 117 (47) | 123 (51) | 128 (53) | 134 (57) | ||
| 96 (36) | 101 (38) | 104 (40) | 108 (42) | 112 (44) | 116 (47) | 121 (49) | 126 (52) | 132 (56) | |
| 94 (34) | 97 (36) | 100 (38) | 103 (39) | 106 (41) | 110 (43) | 114 (46) | 119 (48) | 124 (51) | 129 (54) |
| 92 (33) | 94 (34) | 96 (36) | 99 (37) | 101 (38) | 105 (41) | 108 (42) | 112 (44) | 116 (47) | 121 (49) |
| 90 (32) | 91 (33) | 93 (34) | 95 (35) | 97 (36) | 100 (38) | 103 (39) | 105 (41) | 109 (43) | 113 (45) |
| 88 (31) | 88 (31) | 89 (32) | 91 (33) | 93 (34) | 95 (35) | 98 (37) | 100 (38) | 103 (39) | 106 (41) |
| 86 (30) | 85 (29) | 87 (31) | 88 (31) | 89 (32) | 91 (33) | 93 (34) | 95 (35) | 97 (36) | 100 (38) |
| 84 (29) | 83 (28) | 84 (29) | 85 (29) | 86 (30) | 88 (31) | 89 (32) | 90 (32) | 92 (33) | 94 (34) |
| 82 (28) | 81 (27) | 82 (28) | 83 (28) | 84 (29) | 84 (29) | 85 (29) | 86 (30) | 88 (31) | 89 (32) |
| 80 (27) | 80 (27) | 80 (27) | 81 (27) | 81 (27) | 82 (28) | 82 (28) | 83 (28) | 84 (29) | 84 (29) |
RISK LEVEL FOR HEAT DISORDERS: CAUTION EXTREME CAUTION
EXAMPLE: When the temperature is 88°F (31°C) and the relative humidity is 60 percent, the heat index, or how hot it feels, is 95°F (35°C).
THE UV INDEX FOR MEASURING ULTRAVIOLET RADIATION RISK
The U.S. National Weather Service's daily forecasts of ultraviolet levels use these numbers for various exposure levels:
| UV INDEX NUMBER | EXPOSURE LEVEL | ACTIONS TO TAKE |
|---|---|---|
| 0, 1, 2 | Low | Wear UV-blocking sunglasses on bright days. In winter, reflection off snow can nearly double UV strength. If you burn easily, cover up and apply SPF 30+ sunscreen. |
| 3, 4, 5 | Moderate | Apply SPF 30+ sunscreen; wear a hat and sunglasses. Stay in shade when sun is strongest. |
| 6, 7 | High | Apply SPF 30+ sunscreen; wear a hat, sunglasses, and protective clothing; limit midday exposure. |
| 8, 9, 10 | Very High | Apply SPF 30+ sunscreen; wear a hat, sunglasses, and protective clothing; limit midday exposure. Seek shade. Unprotected skin will be damaged and can burn quickly. |
| 11 or higher | Extreme | Apply SPF 30+ sunscreen; wear a hat, sunglasses, and protective clothing; avoid midday exposure; seek shade. Unprotected skin can burn in minutes. |
Get your local forecast at Almanac.com/Weather.