There is no question that the most popular time of year to visit the Valley is in winter. This is partly because the rest of the country is experiencing it's worst weather of the year and in contrast, Phoenix seems like summer. So accept that any time after September and before May is probably best.
RSV: RSV in clinical medicine is the abbreviation for respiratory syncytial virus. See: Respiratory syncytial virus.
1 Mean corpuscular volume (MCV) is the average volume of a red blood cell. 2  This is a calculated value derived from the hematocrit and red cell count. 3  Normal range may fall between 80 to 100 femtoliters (a fraction of one millionth of a liter).