Global temperature, Sep 1988

Global anomaly+0.37°C1951–1980

Rank among all Seps31 / 146warmest first

N. Hemisphere+0.26°C

S. Hemisphere+0.47°C

vs same month last year+0.02°C

CO₂ (Mauna Loa)348.97 ppm

All months of 1988

Jan+0.57°C

Feb+0.44°C

Mar+0.52°C

Apr+0.43°C

May+0.44°C

Jun+0.40°C

Jul+0.33°C

Aug+0.39°C

Sep ◀+0.37°C

Oct+0.38°C

Nov+0.12°C

Dec+0.29°C

This month+0.37°C

Same month, previous year+0.35°C

Same month 10 years earlier+0.06°C

Same month 50 years earlier+0.01°C

Sep average 1991–2020+0.58°C

Warmest Sep on record (2023)+1.48°C

Year	Global	NH	SH	Rank
1978	+0.06°C	−0.01°C	+0.12°C	58
1979	+0.25°C	+0.19°C	+0.31°C	39
1980	+0.20°C	+0.10°C	+0.31°C	43
1981	+0.15°C	+0.13°C	+0.16°C	45
1982	+0.14°C	+0.06°C	+0.23°C	47
1983	+0.37°C	+0.26°C	+0.49°C	32
1984	+0.21°C	−0.04°C	+0.46°C	41
1985	+0.13°C	+0.02°C	+0.24°C	48
1986	+0.03°C	−0.02°C	+0.09°C	62
1987	+0.35°C	+0.39°C	+0.33°C	34
1988	+0.37°C	+0.26°C	+0.47°C	31
1989	+0.35°C	+0.23°C	+0.46°C	33
1990	+0.23°C	+0.42°C	+0.05°C	40
1991	+0.44°C	+0.36°C	+0.52°C	27
1992	−0.01°C	−0.18°C	+0.18°C	68
1993	+0.11°C	−0.06°C	+0.30°C	50
1994	+0.31°C	+0.33°C	+0.30°C	36
1995	+0.33°C	+0.43°C	+0.24°C	35
1996	+0.26°C	+0.04°C	+0.47°C	38
1997	+0.52°C	+0.52°C	+0.55°C	25
1998	+0.42°C	+0.61°C	+0.24°C	28

Rank 404 of all 1760 months on record. Temperatures are anomalies vs the 1951–1980 average (NASA GISTEMP v4); values can be revised later.