The average value from all these simulations are then recorded. With all available gages within 40 miles of Downtown Phoenix, 30 gages are randomly selected and their average and percent with measurable rain are computed. To generate the averages, a Monte Carlo simulation is used. The most common error will be light precip amounts at individual gages when no rain actually occurred. Strong thunderstorms developed over the Phoenix valley on the evening of July 3rd as outflows converged. Also, please be aware that the rainfall data are only passed through minimal quality control mechanisms. When this happens it is reflective of either a very light or very isolated precipitation event. How much rain has fallen in your area See the latest rainfall totals. Coupled with mathematical rounding, it is very likely there will be days when precipitation falls across the PMA yet the average rainfall is 0.00". 32 inches (WY22) 2021 Temperature Precipitation Flagstaff-Phoenix-Tucson: Rankings. Therefore, any precipitation less than 1 mm/0.04" will not be measured by the rain gages. The FCD rain gages measure precipitation in millimeters (increments of 0.04"). The PRI, based on rain observed within 40 miles of Downtown Phoenix from the Maricopa County Flood Control District's network of ALERT rain gauges across the PMA, provides an average rainfall amount and what percent of gages measured rain. To offer a companion measurement to the official observations at KPHX, the Phoenix Rainfall Index (PRI) was been created. This is especially true during the monsoon. While KPHX did a good job of reprenting rainfall of Phoenix when it was smaller, with the vast sprawl of the area now there are times where portions of the PMA receive rain while other, including KPHX, do not. Since 1933, it has resided at Phoenix Sky Harbor International Airport (KPHX). ![]() The continuation of this Drought Emergency has been recommended by the Drought Interagency Coordinating Group in their bi-annual meeting on May 11, 2021. Historically, the official rain gauge for the Phoenix Metropolitan Area (PMA) has been situated near the center of the city. A Drought Emergency Declaration remains in effect for the state of Arizona as signed by the governor in accordance with the Arizona Drought Preparedness Plan. ![]() Please review our full terms contained on our Terms of Service page.Phoenix, Arizona is a vast, sprawling metropolis which covers an area of nearly 2000 sq-mi. We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands. We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. We assume no responsibility for any decisions made on the basis of the content presented on this site. Weather data is prone to errors, outages, and other defects. The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. See all nearby weather stations Disclaimer ![]() The details of the data sources used for this report can be found on the Imperial County Airport page.
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