Global temperature, May 2009

Global anomaly+0.65°C1951–1980

Rank among all Mays18 / 147warmest first

N. Hemisphere+0.65°C

S. Hemisphere+0.66°C

vs same month last year+0.15°C

CO₂ (Mauna Loa)390.36 ppm

All months of 2009

Jan+0.65°C

Feb+0.53°C

Mar+0.53°C

Apr+0.61°C

May ◀+0.65°C

Jun+0.63°C

Jul+0.74°C

Aug+0.69°C

Sep+0.72°C

Oct+0.65°C

Nov+0.80°C

Dec+0.67°C

This month+0.65°C

Same month, previous year+0.50°C

Same month 10 years earlier+0.26°C

Same month 50 years earlier+0.04°C

May average 1991–2020+0.58°C

Warmest May on record (2024)+1.16°C

Year	Global	NH	SH	Rank
1999	+0.26°C	+0.36°C	+0.16°C	42
2000	+0.35°C	+0.55°C	+0.16°C	30
2001	+0.57°C	+0.69°C	+0.46°C	23
2002	+0.64°C	+0.52°C	+0.77°C	19
2003	+0.60°C	+0.72°C	+0.49°C	22
2004	+0.37°C	+0.52°C	+0.22°C	29
2005	+0.63°C	+0.77°C	+0.48°C	20
2006	+0.48°C	+0.76°C	+0.20°C	26
2007	+0.69°C	+0.71°C	+0.66°C	16
2008	+0.50°C	+0.61°C	+0.39°C	25
2009	+0.65°C	+0.65°C	+0.66°C	18
2010	+0.75°C	+0.94°C	+0.58°C	15
2011	+0.53°C	+0.66°C	+0.40°C	24
2012	+0.78°C	+0.96°C	+0.60°C	14
2013	+0.60°C	+0.77°C	+0.43°C	21
2014	+0.87°C	+0.90°C	+0.83°C	8
2015	+0.80°C	+1.05°C	+0.55°C	12
2016	+0.96°C	+1.11°C	+0.81°C	5
2017	+0.91°C	+0.93°C	+0.90°C	7
2018	+0.81°C	+1.01°C	+0.61°C	11
2019	+0.86°C	+1.02°C	+0.71°C	9

Rank 221 of all 1760 months on record. Temperatures are anomalies vs the 1951–1980 average (NASA GISTEMP v4); values can be revised later.