Lowest temperature in Oklahoma City on May 1, 2026?

Specific daily low temperature frequency for May 1st is unavailable. The precise historical frequency distribution of the daily low temperature on May 1st for Will Rogers World Airport (OKC), categorized into specific market brackets, for the 1991-2020 climatological normal period, cannot be determined from the available web research ^{[^]}. While NOAA's National Centers for Environmental Information (NCEI) does provide U.S. Daily Climate Normals for this period, the detailed frequency distribution data for individual days, such as May 1st, within specific temperature brackets, is not directly accessible or presented in the provided source materials ^{[^]}.

Monthly average minimum temperature for May is available. However, the monthly normals for Will Rogers World Airport (station ID USW00013967) for the 1991-2020 period indicate the average minimum temperature for the entire month of May is 59.3°F ^{[^]}. This average represents the typical lowest daily temperature observed across all days in May over the 30-year period, but it does not provide the specific frequency of daily low temperatures on May 1st falling into predefined brackets ^{[^]}.

La Niña conditions are the most likely for March-April-May 2026. The IRI/CPC multi-model ENSO plume forecasts a 55% probability of La Niña conditions occurring during the March-April-May (MAM) 2026 period, making it the most probable outcome. Additionally, the forecast indicates a 30% chance of Neutral conditions and a 15% chance of El Niño conditions for the identical timeframe ^{[^]}, ^{[^]}, ^{[^]}, ^{[^]}. These probabilities are derived from various climate models, compiled by the International Research Institute for Climate and Society (IRI) and the Climate Prediction Center (CPC) ^{[^]}, ^{[^]}, ^{[^]}.

Historical Oklahoma City low temperatures lack ENSO correlation data. Historically, the average low temperature recorded for May 1st in Oklahoma City is 52°F. The lowest temperature ever observed on this specific date was 34°F, which occurred in 1907 ^{[^]}. However, the provided research does not include historical ENSO classifications necessary to conduct an analysis of May 1st low temperature anomalies in Oklahoma City during comparable La Niña, Neutral, or El Niño periods ^{[^]}.

The Pacific Decadal Oscillation's Spring 2026 phase remains undefined by current research. The Pacific Decadal Oscillation (PDO) is presently in a cold, or negative, phase, which means cooler sea surface temperatures are observed in the eastern tropical Pacific ^{[^]}. While there is an increasing likelihood of the PDO shifting to a warm, or positive, phase, characterized by warmer waters in that same region, existing research does not offer a definitive forecast for its specific phase in Spring 2026 ^{[^]}. Predicting such long-term climate oscillations is inherently complex and typically relies on advanced climate modeling ^{[^]}.

Oklahoma City May 1st temperature data lacks direct PDO phase correlation. For Oklahoma City, the average daily low temperature on May 1st is approximately 56°F ^{[^]}, with the broader monthly average daily minimum for May recorded at about 59.1°F ^{[^]}. Although the PDO is known to influence climate patterns across North America, including mid-latitude regions ^{[^]}, the provided sources do not contain specific historical data detailing how May 1st low temperatures in Oklahoma City deviate from this mean during different PDO phases. Consequently, a direct statistical analysis comparing May 1st low temperature deviations with historical PDO phases cannot be performed based on the information provided.

The last spring freeze in Oklahoma City has shifted earlier since 1994. Based on Oklahoma Mesonet data from 1994 to 2023, the average last freeze for the Oklahoma City area is March 27 ^{[^]}. A comparison of two distinct decades reveals a notable change: the average last freeze occurred on April 3 from 1994 to 2003, but shifted to March 26 during 2014 to 2023, representing an average acceleration of 8 days over these periods ^{[^]}. Maps detailing average final spring freeze dates across Oklahoma, including the Oklahoma City area, corroborate this pattern, showing Oklahoma County typically experiences its last freeze between March 21 and March 30 ^{[^]}.

Specific data on sub-48°F temperature frequency changes is unavailable in the research. Regarding the frequency of temperatures below 48°F during the last week of April and the first week of May, and how this has changed between the last decade and the prior one, the provided research lacks specific data or analyses to answer this particular question. While the Oklahoma Mesonet system does offer access to daily historical data that could facilitate such an analysis ^{[^]}, the sources supplied do not summarize this specific metric or provide a comparison of temperature frequencies for the requested threshold within the specified two-week period across the two decades. Sources like WeatherAPI offer general monthly average temperatures for April and May in Oklahoma City, but do not provide the detailed daily frequency analysis necessary for this comparison ^{[^]}.

Strong La Niña conditions are projected for 2026. The International Research Institute for Climate and Society (IRI) and the Climate Prediction Center (CPC) forecast a strong probability of La Niña conditions for the April-June 2026 period, with a 60% chance ^{[^]}. This projection aligns with a trend towards negative sea surface temperature anomalies in the Niño 3.4 region ^{[^]}. Additionally, the projected Pacific Decadal Oscillation (PDO) state for 2026 is negative, as indicated by research on extending sea surface temperature anomaly forecasts ^{[^]}.

Three analog years match 2026's projected conditions. To find analog years since 1980 that align with a strong La Niña and a negative PDO phase, historical ENSO and PDO data were reviewed ^{[^]}. Based on this review, 1988, 2000, and 2011 were identified as years characterized by strong La Niña events and a contemporaneous negative PDO phase around May 1st ^{[^]}. These periods represent oceanic and atmospheric conditions in the Pacific that closely resembled the projected 2026 states ^{[^]}.

Oklahoma City experienced specific low temperatures in these analog years. The exact daily low temperatures recorded in Oklahoma City on May 1st in these analog years were: 46°F on May 1, 1988; 48°F on May 1, 1999; and 55°F on May 1, 2011 ^{[^]}. These historical temperatures provide a reference for conditions under similar climate patterns.

Catalyst analysis unavailable.