IUMASOIA

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Date Monthly average Sterling overnight index average (SONIA) rate
[a]
IUMASOIA
31 Jan 10 0.4545
28 Feb 10 0.4672
31 Mar 10 0.4713
30 Apr 10 0.4726
31 May 10 0.4842
30 Jun 10 0.487
31 Jul 10 0.49
31 Aug 10 0.491
30 Sep 10 0.501
31 Oct 10 0.5083
30 Nov 10 0.5086
31 Dec 10 0.5173
31 Jan 11 0.5059
28 Feb 11 0.5084
31 Mar 11 0.5154
30 Apr 11 0.524
31 May 11 0.5217
30 Jun 11 0.5311
31 Jul 11 0.5228
31 Aug 11 0.538
30 Sep 11 0.5486
31 Oct 11 0.5358
30 Nov 11 0.5347
31 Dec 11 0.5201
31 Jan 12 0.5157
29 Feb 12 0.4993
31 Mar 12 0.49
30 Apr 12 0.4861
31 May 12 0.4848
30 Jun 12 0.4859
31 Jul 12 0.4646
31 Aug 12 0.45
30 Sep 12 0.4271
31 Oct 12 0.4334
30 Nov 12 0.4256
31 Dec 12 0.4309
31 Jan 13 0.4097
28 Feb 13 0.4261
31 Mar 13 0.4353
30 Apr 13 0.4396
31 May 13 0.4336
30 Jun 13 0.4252
31 Jul 13 0.4301
31 Aug 13 0.427
30 Sep 13 0.4299
31 Oct 13 0.4313
30 Nov 13 0.43
31 Dec 13 0.4215
31 Jan 14 0.4287
28 Feb 14 0.4197
31 Mar 14 0.4159
30 Apr 14 0.422
31 May 14 0.4233
30 Jun 14 0.4251
31 Jul 14 0.4283
31 Aug 14 0.4228
30 Sep 14 0.4319
31 Oct 14 0.4308
30 Nov 14 0.4325
31 Dec 14 0.428
31 Jan 15 0.4355
28 Feb 15 0.4511
31 Mar 15 0.4568
30 Apr 15 0.4574
31 May 15 0.462
30 Jun 15 0.4566
31 Jul 15 0.4549
31 Aug 15 0.459
30 Sep 15 0.4544
31 Oct 15 0.4622
30 Nov 15 0.4636
31 Dec 15 0.4575
31 Jan 16 0.4659
29 Feb 16 0.4657
31 Mar 16 0.4646
30 Apr 16 0.4663
31 May 16 0.4633
30 Jun 16 0.4598
31 Jul 16 0.4577
31 Aug 16 0.2478
30 Sep 16 0.213
31 Oct 16 0.212
30 Nov 16 0.2108
31 Dec 16 0.2125
31 Jan 17 0.2135
28 Feb 17 0.2106
31 Mar 17 0.2095
30 Apr 17 0.2114
31 May 17 0.2126
30 Jun 17 0.2121
31 Jul 17 0.2124
31 Aug 17 0.2132
30 Sep 17 0.2123
31 Oct 17 0.211
30 Nov 17 0.4493
31 Dec 17 0.4619
31 Jan 18 0.4631
28 Feb 18 0.4634
31 Mar 18 0.4637
30 Apr 18 0.4617
31 May 18 0.4529
30 Jun 18 0.4507
31 Jul 18 0.4545
31 Aug 18 0.6911
30 Sep 18 0.7012
31 Oct 18 0.7011
30 Nov 18 0.7017
31 Dec 18 0.7026
31 Jan 19 0.7053
28 Feb 19 0.7061
31 Mar 19 0.7053
30 Apr 19 0.7081
31 May 19 0.7094
30 Jun 19 0.7085
31 Jul 19 0.709
31 Aug 19 0.7101
30 Sep 19 0.7098
31 Oct 19 0.7108
30 Nov 19 0.7105
31 Dec 19 0.7101
31 Jan 20 0.7113
29 Feb 20 0.7104
31 Mar 20 0.3192
30 Apr 20 0.0659

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Notes:

[a] On 23 April 2018, SONIA was reformed. For further information on the changes made, see the `Background on SONIA reform' section of the following page: www.bankofengland.co.uk/markets/sonia-benchmark

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