Global temperature, Dec 1999

Global anomaly+0.40°C1951–1980

Rank among all Decs33 / 146warmest first

N. Hemisphere+0.66°C

S. Hemisphere+0.14°C

vs same month last year−0.15°C

CO₂ (Mauna Loa)368.26 ppm

All months of 1999

Jan+0.48°C

Feb+0.64°C

Mar+0.33°C

Apr+0.32°C

May+0.26°C

Jun+0.36°C

Jul+0.39°C

Aug+0.31°C

Sep+0.39°C

Oct+0.34°C

Nov+0.37°C

Dec ◀+0.40°C

This month+0.40°C

Same month, previous year+0.55°C

Same month 10 years earlier+0.37°C

Same month 50 years earlier−0.18°C

Dec average 1991–2020+0.60°C

Warmest Dec on record (2023)+1.36°C

Year	Global	NH	SH	Rank
1989	+0.37°C	+0.33°C	+0.41°C	37
1990	+0.40°C	+0.38°C	+0.43°C	34
1991	+0.32°C	+0.20°C	+0.43°C	38
1992	+0.22°C	+0.21°C	+0.22°C	45
1993	+0.18°C	+0.22°C	+0.15°C	49
1994	+0.39°C	+0.36°C	+0.42°C	35
1995	+0.26°C	+0.27°C	+0.25°C	42
1996	+0.37°C	+0.35°C	+0.39°C	36
1997	+0.59°C	+0.51°C	+0.68°C	19
1998	+0.55°C	+0.74°C	+0.35°C	21
1999	+0.40°C	+0.66°C	+0.14°C	33
2000	+0.28°C	+0.27°C	+0.28°C	41
2001	+0.55°C	+0.65°C	+0.45°C	20
2002	+0.44°C	+0.43°C	+0.47°C	29
2003	+0.75°C	+0.98°C	+0.52°C	14
2004	+0.51°C	+0.44°C	+0.57°C	24
2005	+0.68°C	+0.83°C	+0.52°C	16
2006	+0.79°C	+1.15°C	+0.43°C	13
2007	+0.50°C	+0.77°C	+0.21°C	25
2008	+0.54°C	+0.65°C	+0.43°C	22
2009	+0.67°C	+0.67°C	+0.68°C	17

Rank 381 of all 1760 months on record. Temperatures are anomalies vs the 1951–1980 average (NASA GISTEMP v4); values can be revised later.