Temperature

Temperature

The monthly and seasonal maximum, minimum and mean temperature anomalies averaged over the State of Bihar is given in the Figure 1. The anomalies were computed based on the Long Period Average (LPA) for the period 1981-2010. The State averaged monthly maximum temperature was cooler than average during the months of January, May, June, October, November and December 2021 with May recording lowest monthly maximum temperature anomaly (-3.3^oC, fourth coolest since 1901) and warmer during rest of the months. The State averaged monthly minimum temperature was warmer than the average during all the months except in April, May and June with highest anomaly recorded in October (1.7^oC). The State averaged mean monthly temperature was warmer than average during all the months of the year except in January, May, June and November. Among the months, the lowest State averaged monthly mean temperature anomaly was recorded in May (-2.1^oC, coolest since 1901), followed by June (-1.2^oC, fifth coolest since 1901). The State averaged monthly minimum temperature anomaly was recorded in May (-1.0^oC, fourth coolest since 1901), followed by June (-0.5^oC, sixth coolest since 1901) and the State averaged monthly maximum temperature anomaly was recorded in May (-3.3^oC, fourth coolest since 1901). Figure 2 shows the Spatial pattern of Annual Maximum, Minimum and Mean Temperature anomalies over Bihar during 2021. The maximum temperature anomalies were -1.0^oC to -0.5^oC while minimum temperature anomalies were 0.5^oC to >1.0^oC over all the districts of the state except some part of the state. The mean temperature anomalies were within + 0.5^oC over most part of the state except few districts. During the year 2021, the annual mean land surface air temperature of Bihar was 24.0^oC with anomaly +0.1^oC warmer than the average (1981-2010) (Figure 3). No significant trend is observed in the State averaged annual mean temperature during 1901-2021 (Figure 3). The annual maximum temperature averaged over the state during the year 2021 was cooler than average with anomaly of -0.3^oC while annual minimum temperature averaged over the state was warmer than average by 0.4^oC (Figure 1). During the period 1901-2021, the State averaged maximum temperature showed a significant increasing trend (0.54^oC/100 years) while the State averaged minimum temperature showed a significant decreasing trend (-0.53^oC/100 years) (Figure 3).

Figure 1: Monthly and Seasonal Maximum, Minimum and Mean Temperature anomalies averaged over Bihar during 2021.The anomalies were computed from long period average for the base period of 1981-2010 (Source: India Meteorological Department).

Figure 2 (a): Spatial pattern of Annual Maximum Temperature anomalies over Bihar during 2021.The anomalies were computed from long period average for the base period of 1981-2010 (Source: India Meteorological Department).

Figure 2 (b): Spatial pattern of Annual Minimum Temperature anomalies over Bihar during 2021.The anomalies were computed from long period average for the base period of 1981-2010 (Source: India Meteorological Department).

Figure 2 (c): Spatial pattern of Annual Mean Temperature anomalies over Bihar during 2021.The anomalies were computed from long period average for the base period of 1981-2010 (Source: India Meteorological Department).