Table 9. Performance of Boosting-based models during 10-fold cross validation and testing stages at Chengdu station.

Models	10 Fold cross validation results			Testing results
	RMSE	MAE	Adj_R2	RMSE	MAE	Adj_R2
	mm/d	mm/d		mm/d	mm/d
Tmax, Tmin, Rs
ADA1	0.5473	0.4533	0.8515	0.5506	0.4556	0.8458
GBDT1	0.3697	0.2630	0.9323	0.3640	0.2583	0.9326
XGB1	0.3595	0.2585	0.9360	0.3543	0.2528	0.9361
LGB1	0.3582	0.2556	0.9364	0.3516	0.2508	0.9371
CAT1	0.3521	0.2499	0.9385	0.3413	0.2439	0.9407
Tmax, Tmin, RH
ADA2	0.5962	0.4731	0.8247	0.5907	0.4662	0.8225
GBDT2	0.5552	0.4074	0.8476	0.5501	0.4005	0.8461
XGB2	0.5425	0.4042	0.8545	0.5201	0.3891	0.8624
LGB2	0.5370	0.3978	0.8574	0.5235	0.3852	0.8606
CAT2	0.5337	0.3943	0.8592	0.5109	0.3746	0.8672
Tmax, Tmin, U2
ADA3	0.6889	0.5560	0.7665	0.6831	0.5553	0.7626
GBDT3	0.6100	0.4645	0.8166	0.6092	0.4681	0.8112
XGB3	0.5914	0.4548	0.8277	0.5908	0.4595	0.8224
LGB3	0.5898	0.4529	0.8286	0.5881	0.4576	0.8240
CAT3	0.5835	0.4483	0.8323	0.5753	0.4455	0.8316
Tmax, Tmin
ADA4	0.7012	0.5602	0.7582	0.7124	0.5639	0.7419
GBDT4	0.6482	0.4973	0.7933	0.6495	0.5004	0.7855
XGB4	0.6369	0.4984	0.8006	0.6376	0.5016	0.7933
LGB4	0.6288	0.4910	0.8060	0.6330	0.4933	0.7963
CAT4	0.6197	0.4808	0.8110	0.6206	0.4820	0.8042
Tmax, Tmin, Ra
ADA5	0.6824	0.5470	0.7703	0.6857	0.5549	0.7608
GBDT5	0.6159	0.4711	0.8125	0.6267	0.4753	0.8002
XGB5	0.5944	0.4593	0.8256	0.5967	0.4606	0.8189
LGB5	0.5948	0.4588	0.8253	0.5953	0.4587	0.8197
CAT5	0.5869	0.4521	0.8300	0.5795	0.4474	0.8292
Tmax, Tmin, J
ADA6	0.6739	0.5376	0.7760	0.6697	0.5414	0.7719
GBDT6	0.6135	0.4689	0.8141	0.6180	0.4750	0.8057
XGB6	0.5963	0.4599	0.8247	0.5943	0.4594	0.8203
LGB6	0.5949	0.4590	0.8255	0.5916	0.4574	0.8219
CAT6	0.5881	0.4531	0.8294	0.5800	0.4500	0.8288