This study employs ETCCDMI extreme indices, which are based on long-term weather observations from weather stations, to examine the effects of climatic variability on agricultural production in the state of Haryana, India. The most significant economic sector in Haryana is agriculture, and the study indicated that climate variability has a considerable regional and temporal impact on agricultural production. According to the study, Haryana's mean maximum and minimum temperature have significantly increased over the past two decades, with a warming shift at night. Extreme maximum temperatures and diurnal temperature range indices were shown to be environmental factors that adversely affect the yield of rainfed crops in the districts of Haryana. In general, this study emphasizes how crucial it is to comprehend how climatic variability affects agricultural production, especially in areas where agriculture is a key economic sector. Policymakers and farmers may establish policies to lessen the effects of climate change on agriculture and assure sustainable food production in the future by recognizing the individual environmental conditions that affect crop productivity. The study also points out that more investigation is required to assess how severe temperatures affect plant growth at various phenological stages and how this affects productivity. This suggests that there is still much to learn about the complex relationships between climate variability, agricultural production, and crop yields.