Degree day numbers

Degree day numbers of the weather station at the research centre Jülich

The following table contains the degree day numbers calculated in accordance with VDI Guideline 3807 Sheet 1 for the weather station at Forschungszentrum Jülich. The continuous temperature measurements at 2 metres above the ground were used to determine the average outdoor temperatures used in the calculation. In accordance with the guideline, the heating limit is 15°C, i.e. only days with an average temperature below 15°C are taken into account. The average room temperature is assumed to be 20°C.

Degree day numbers since 1980

Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	G_a
1980	--	--	279	355	219	119	43	42	112	262	300	481	--
1981	511	445	318	287	202	89	36	82	137	312	286	593	3297
1982	476	472	436	351	177	65	40	37	70	187	274	510	3094
1983	359	356	425	327	246	46	13	39	102	280	433	527	3151
1984	526	534	383	345	341	308	95	23	174	255	350	476	3809
1985	725	557	452	317	162	116	16	55	131	283	450	437	3699
1986	520	232	284	331	115	93	33	68	239	229	349	476	2968
1987	711	507	521	130	283	146	33	73	92	247	383	463	3589
1988	413	462	443	307	97	94	47	40	119	279	436	414	3150
1989	428	423	159	296	134	109	28	37	99	218	418	459	2806
1990	445	333	337	331	132	97	69	6	176	209	413	518	3066
1991	517	539	312	285	258	169	5	11	51	258	391	353	3149
1992	314	417	386	242	64	48	5	12	116	380	362	491	2837
1993	422	520	433	216	99	62	33	63	170	238	536	458	3249
1994	410	471	370	287	172	88	0	30	153	299	263	428	2970
1995	516	349	463	269	70	150	0	29	128	160	415	578	3125
1996	597	399	419	236	234	118	47	32	206	195	398	578	3459
1997	621	375	358	366	202	79	11	0	148	313	420	475	3367
1998	422	343	385	294	118	66	49	65	68	319	482	490	3100
1999	446	486	387	290	143	109	6	36	23	297	428	483	3131
Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	G_a
2000	443	411	400	254	125	82	92	26	95	261	360	451	3001
2001	520	427	427	345	115	118	16	6	215	152	436	552	3330
2002	493	355	398	310	169	38	33	5	172	326	323	506	3127
2003	563	476	380	290	178	6	17	19	139	383	342	492	3285
2004	522	442	437	272	227	81	42	22	100	258	446	586	3435
2005	476	548	419	277	175	84	28	54	101	170	408	523	3263
2006	594	505	496	324	138	72	0	71	24	145	323	429	3122
2007	408	388	380	176	123	25	44	42	166	312	418	510	2992
2008	429	433	435	328	65	60	36	12	178	303	399	553	3231
2009	626	470	432	201	146	110	18	11	106	305	306	535	3264
2010	645	505	422	291	275	54	0	34	175	298	406	664	3769
2011	523	429	408	162	115	90	76	44	76	249	368	438	2978
2012	482	575	352	322	124	93	40	7	161	280	397	483	3314
2013	552	529	540	298	253	104	11	11	163	211	421	442	3534
2014	443	374	345	222	200	81	18	85	82	187	352	483	2871
2015	510	478	425	309	199	68	30	19	179	314	301	330	3160
2016	474	450	458	313	128	43	23	22	35	322	416	485	3169
2017	605	397	320	352	116	6	11	22	154	197	400	469	3047
2018	432	555	463	185	85	25	0	17	123	224	386	443	2937
2019	546	383	368	242	231	5	23	5	76	192	397	422	2890
Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	G_a
2020	431	347	395	204	158	43	11	0	66	253	336	456	2698
2021	533	417	405	395	247	12	6	28	58	260	420	449	3229
2022	491	382	381	303	120	24	0	0	140	159	323	494	2817
2023	461	405	392	330	145	6	5	28	37	184	379	422	2794
2024	518	333	327	245

(G_a: Degree day numbers of the corresponding year)

Note: Minor differences between the total number of degree days for all months of a year and the annual total given are due to rounding of the monthly values.

Long-term climate observations

Meteograms

Degree day numbers

Grassland temperature sum

Ansprechpartner: Dr. Patrizia Ney

Last Modified: 07.05.2025