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Freeze Data: Ritzville, Washington

Spring Freeze Probabilities

Probability of Overnight Low Temperature Less Than X, by Date
Temperature °F.	Earliest	90%	80%	70%	60%	50%	40%	30%	20%	10%	Latest
36.5	05/10	05/17	05/21	05/30	06/06	06/09	06/14	06/19	06/29	07/01	07/18
32.5	04/04	04/26	05/05	05/09	05/12	05/16	05/20	05/25	05/29	06/02	06/13
28.5	03/17	04/13	04/16	04/26	04/28	05/02	05/05	05/06	05/11	05/16	05/29
24.5	02/08	03/06	03/19	03/28	04/05	04/11	04/15	04/18	04/25	04/30	05/29
20.5	01/03	01/31	02/12	02/16	03/03	03/04	03/09	03/23	03/30	04/18	04/30

For example, on May 5th there is a 70% chance that the nightly low will be at or below 32.5 °F., but by June 2nd there is only a 10% chance of seeing an overnight low below that temperature. For temperatures in between those shown, one can interpolate by gosh and by golly, or check this graph of the full data.

Fall Freeze Probabilities

Probability of Overnight Low Temperature Less Than X, by Date
Temperature °F.	Earliest	10%	20%	30%	40%	50%	60%	70%	80%	90%	Latest
36.5	08/18	09/05	09/08	09/15	09/17	09/20	09/22	09/26	10/01	10/06	10/18
32.5	08/23	09/17	09/21	09/23	09/27	09/29	10/02	10/07	10/14	10/17	10/24
28.5	09/14	09/26	10/03	10/08	10/11	10/15	10/17	10/22	10/27	11/01	11/17
24.5	09/24	10/13	10/17	10/25	10/30	11/03	11/05	11/09	11/13	11/17	12/07
20.5	10/09	10/28	10/31	11/06	11/11	11/15	11/21	11/25	11/30	12/12	/

**/** = there has been a year when the minimum temperature didn't go below the threshold temperature during the July 31 to Dec. 31 period

For temperatures in between those shown, one can interpolate by gosh and by golly, or check this graph of the full data.

Freeze-Free Probabilities

Probable Length of "Frost-Free" Season For Various "Frost" Temperatures
Temperature °F.	Shortest	90%	80%	70%	60%	50%	40%	30%	20%	10%	Longest
36.5	40	71	81	90	99	105	108	115	123	133	155
32.5	84	115	120	128	133	135	139	145	149	166	183
28.5	120	140	152	158	164	170	175	178	182	190	229
24.5	149	171	184	197	203	209	212	222	230	249	262
20.5	183	206	231	239	243	251	261	279	284	306	***

*** = there has been at least one year when a minimum temperature below the threshold was not recorded

For temperatures in between those shown, one can interpolate by gosh and by golly, or check this graph of the full data.

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