The latest HadSST4 data release allows me to calculate global temperatures up to March 2022 based on spherical triangulation. HadSST4 results in higher temperatures compared to HadSST3 relative to the baseline of 1961-1990. I combine this with GHCN-V4C station data. The results for the monthly temperatures are shown below. There is still evidence of a weak La Nina and cool spots in Eastern Europe and central Siberia.
Upgrading from HadSST3 to HadSST4 has led to a slight increase in average temperature anomalies due to instrumentation corrections. The average temperature anomaly in March was 0.96C up from 0.78C in February. The first three months of 2022 show a small temperature increase on the annual 2021 average temperature from 0.79C to 0.86C
The monthly data show the effects of La Nina and El Nino cycles.
The temperature data can be downloaded.