Rexburg
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Rexburg clear sky chart from 2005-11-06 to 2024-12-24.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	8% 9% 3 6% 4 3 4 3 5% 6% 50%	105681
	Night	10% 10% 3 7% 4 3 4 3 5% 6% 45%	103108
Transparency	Day	36% 4 9% 21% 19% 11%	105427
	Night	40% 4 11% 21% 16% 8%	102950
Seeing	Day	12% 9% 23% 30% 20% 6%	15484
	Night	15% 5% 20% 40% 18% 2	25154

By Month

Percentage Cloud Cover SW (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	13% 23% 7% 11% 4 3 4 3 4 5% 23%	2393
	11th to 20th	Day	15% 16% 6% 11% 6% 4 3 3 4 4 27%	2610
	21st to end	Day	18% 21% 5% 12% 3 3 3 2 3 3 25%	3146
February	1st to 10th	Day	16% 16% 5% 11% 5% 4 4 3 4 4 27%	1710
	11th to 20th	Day	14% 17% 6% 11% 5% 3 4 3 5% 5% 28%	1665
	21st to end	Day	10% 18% 6% 10% 6% 4 4 3 5% 5% 29%	1565
March	1st to 10th	Day	10% 16% 5% 10% 5% 4 4 3 4 6% 33%	3314
	11th to 20th	Day	8% 10% 3 6% 4 3 3 3 3 5% 52%	3490
	21st to end	Day	12% 16% 5% 11% 7% 5% 5% 4 5% 6% 23%	3825
April	1st to 10th	Day	12% 13% 4 7% 5% 4 4 4 6% 7% 34%	2163
	11th to 20th	Day	8% 11% 4 6% 5% 5% 4 3 5% 7% 42%	2437
	21st to end	Day	10% 11% 3 7% 5% 4 4 4 5% 7% 40%	2470
May	1st to 10th	Day	12% 10% 2 6% 4 3 4 3 5% 7% 43%	4110
	11th to 20th	Day	5% 5% 2 5% 3 4 4 3 6% 8% 55%	4090
	21st to end	Day	10% 8% 2 6% 4 4 4 3 5% 7% 46%	4825
June	1st to 10th	Day	9% 5% 2 6% 5% 4 5% 4 7% 8% 46%	2788
	11th to 20th	Day	10% 5% 2 5% 4 3 4 3 5% 7% 51%	2850
	21st to end	Day	3 2 1 3 2 3 3 2 4 7% 69%	2850
July	1st to 10th	Day	1 1 1 2 2 2 2 2 4 6% 76%	4740
	11th to 20th	Day	2 2 1 3 2 3 3 3 4 6% 70%	4433
	21st to end	Day	3 2 1 3 3 3 3 3 5% 7% 67%	4454
August	1st to 10th	Day	5% 4 1 4 3 3 4 4 6% 7% 59%	4092
	11th to 20th	Day	3 2 1 2 2 3 3 3 5% 7% 70%	4028
	21st to end	Day	3 2 1 3 3 3 3 3 5% 5% 70%	4521
September	1st to 10th	Day	5% 3 1 3 2 3 3 2 4 5% 69%	2218
	11th to 20th	Day	7% 3 2 4 3 3 3 3 4 7% 60%	2090
	21st to end	Day	8% 4 1 3 2 2 2 2 5% 6% 63%	2090
October	1st to 10th	Day	8% 4 2 4 3 2 3 2 3 4 66%	3298
	11th to 20th	Day	6% 5% 1 5% 4 3 3 2 3 5% 63%	3150
	21st to end	Day	9% 10% 3 7% 4 4 4 3 5% 6% 45%	3291
November	1st to 10th	Day	15% 12% 3 6% 5% 3 4 3 4 5% 41%	1764
	11th to 20th	Day	13% 11% 3 7% 5% 4 4 4 5% 6% 38%	1640
	21st to end	Day	12% 15% 4 8% 4 3 3 3 4 5% 40%	1600
December	1st to 10th	Day	14% 16% 6% 10% 5% 3 4 2 3 5% 32%	1600
	11th to 20th	Day	18% 16% 6% 13% 5% 4 4 3 3 4 24%	1908
	21st to end	Day	12% 13% 6% 8% 4 4 4 4 5% 7% 34%	2463
January	1st to 10th	Night	12% 18% 6% 13% 4 4 3 3 4 5% 28%	4566
	11th to 20th	Night	19% 23% 5% 10% 5% 3 3 2 3 4 24%	4348
	21st to end	Night	20% 23% 5% 9% 4 3 3 2 2 3 25%	4521
February	1st to 10th	Night	16% 18% 4 10% 5% 3 3 3 5% 5% 28%	2470
	11th to 20th	Night	15% 17% 4 9% 4 4 3 3 4 4 32%	2402
	21st to end	Night	10% 18% 6% 12% 5% 3 4 4 3 6% 27%	1886
March	1st to 10th	Night	10% 15% 5% 10% 6% 4 4 3 4 6% 33%	3559
	11th to 20th	Night	8% 8% 3 5% 3 3 3 3 4 6% 53%	3490
	21st to end	Night	10% 12% 4 8% 5% 5% 6% 4 7% 8% 32%	3828
April	1st to 10th	Night	11% 12% 3 7% 4 5% 4 4 5% 8% 37%	2014
	11th to 20th	Night	10% 10% 3 6% 4 4 5% 3 6% 7% 40%	1691
	21st to end	Night	9% 8% 2 6% 4 4 4 4 6% 7% 45%	1710
May	1st to 10th	Night	9% 11% 3 7% 4 4 4 3 5% 6% 44%	2860
	11th to 20th	Night	5% 4 1 5% 4 5% 5% 3 6% 7% 54%	2812
	21st to end	Night	10% 6% 2 6% 4 4 5% 4 7% 8% 44%	2762
June	1st to 10th	Night	8% 5% 2 5% 5% 4 5% 5% 8% 7% 47%	1387
	11th to 20th	Night	11% 4 1 5% 3 5% 4 3 6% 7% 52%	1330
	21st to end	Night	3 2 1 3 2 3 4 3 5% 7% 68%	1330
July	1st to 10th	Night	3 1 1 3 2 3 3 2 5% 6% 71%	2220
	11th to 20th	Night	1 1 1 2 3 3 4 4 5% 8% 68%	2522
	21st to end	Night	2 2 1 3 3 3 4 4 6% 7% 64%	3109
August	1st to 10th	Night	3 2 2 4 3 3 5% 3 6% 8% 60%	2847
	11th to 20th	Night	2 2 1 4 3 4 4 3 4 7% 66%	2811
	21st to end	Night	4 3 1 4 2 1 2 3 4 5% 72%	3146
September	1st to 10th	Night	5% 3 1 4 2 3 2 2 5% 5% 68%	1958
	11th to 20th	Night	6% 4 1 4 4 3 4 2 5% 7% 60%	2090
	21st to end	Night	9% 4 1 3 2 2 3 2 4 6% 64%	2090
October	1st to 10th	Night	6% 4 1 3 3 2 2 2 3 4 71%	3676
	11th to 20th	Night	12% 6% 2 4 3 3 3 3 4 4 55%	3778
	21st to end	Night	9% 9% 3 6% 4 4 4 4 6% 7% 45%	4265
November	1st to 10th	Night	15% 10% 3 5% 4 3 4 3 5% 6% 44%	2535
	11th to 20th	Night	14% 12% 2 6% 4 4 4 3 5% 6% 39%	2739
	21st to end	Night	11% 12% 5% 7% 5% 4 4 3 4 5% 40%	2800
December	1st to 10th	Night	14% 16% 5% 10% 5% 4 4 3 3 5% 33%	2800
	11th to 20th	Night	15% 18% 5% 10% 5% 4 4 3 4 5% 28%	3490
	21st to end	Night	14% 14% 4 10% 4 4 4 3 4 4 34%	5266

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	66% 5% 13% 14% 3 1	2393
	11th to 20th	Day	61% 5% 14% 12% 7% 1	2610
	21st to end	Day	65% 5% 11% 12% 5% 1	3146
February	1st to 10th	Day	60% 7% 12% 17% 4	1710
	11th to 20th	Day	58% 5% 14% 17% 5% 1	1674
	21st to end	Day	53% 8% 14% 17% 7% 1	1565
March	1st to 10th	Day	51% 5% 14% 23% 6% 1	3314
	11th to 20th	Day	36% 4 13% 33% 13% 1	3490
	21st to end	Day	61% 5% 14% 16% 3	3825
April	1st to 10th	Day	47% 6% 15% 19% 12% 1	2163
	11th to 20th	Day	40% 5% 12% 27% 14% 2	2440
	21st to end	Day	41% 5% 11% 29% 14% 1	2470
May	1st to 10th	Day	40% 5% 6% 26% 18% 4	4110
	11th to 20th	Day	26% 5% 7% 32% 21% 9%	4093
	21st to end	Day	37% 4 9% 31% 17% 2	4825
June	1st to 10th	Day	34% 6% 13% 30% 17% 1	2788
	11th to 20th	Day	31% 4 10% 22% 22% 11%	2850
	21st to end	Day	17% 2 6% 24% 32% 20%	2850
July	1st to 10th	Day	11% 3 3 11% 34% 39%	4666
	11th to 20th	Day	15% 3 2 10% 25% 44%	4356
	21st to end	Day	17% 3 3 14% 34% 29%	4314
August	1st to 10th	Day	24% 3 4 16% 30% 23%	4078
	11th to 20th	Day	15% 3 4 21% 38% 20%	4067
	21st to end	Day	17% 3 4 21% 29% 27%	4520
September	1st to 10th	Day	18% 3 6% 17% 33% 22%	2218
	11th to 20th	Day	25% 3 8% 25% 27% 12%	2090
	21st to end	Day	23% 3 8% 29% 27% 10%	2090
October	1st to 10th	Day	24% 3 7% 21% 38% 7%	3298
	11th to 20th	Day	27% 2 11% 36% 18% 6%	3150
	21st to end	Day	40% 3 15% 26% 15% 1	3291
November	1st to 10th	Day	46% 4 17% 22% 11% 1	1764
	11th to 20th	Day	46% 6% 18% 22% 6% 2	1640
	21st to end	Day	48% 5% 19% 21% 8% 1	1600
December	1st to 10th	Day	56% 6% 13% 18% 6% 2	1600
	11th to 20th	Day	64% 5% 12% 17% 3	1906
	21st to end	Day	51% 6% 16% 20% 7%	2463
January	1st to 10th	Night	60% 5% 10% 21% 4	4566
	11th to 20th	Night	66% 5% 11% 12% 5% 1	4348
	21st to end	Night	67% 4 13% 11% 4 1	4521
February	1st to 10th	Night	59% 5% 15% 16% 5% 1	2470
	11th to 20th	Night	55% 4 15% 19% 6% 1	2403
	21st to end	Night	57% 5% 14% 16% 6% 1	1886
March	1st to 10th	Night	51% 6% 11% 24% 8% 1	3559
	11th to 20th	Night	32% 4 17% 32% 13% 1	3490
	21st to end	Night	48% 6% 19% 23% 4 1	3828
April	1st to 10th	Night	44% 6% 14% 22% 11% 3	2014
	11th to 20th	Night	41% 6% 12% 25% 14% 2	1691
	21st to end	Night	37% 5% 12% 28% 17%	1710
May	1st to 10th	Night	38% 7% 8% 27% 18% 2	2860
	11th to 20th	Night	26% 6% 9% 31% 22% 7%	2813
	21st to end	Night	36% 5% 9% 28% 20% 2	2762
June	1st to 10th	Night	31% 8% 14% 24% 21% 2	1387
	11th to 20th	Night	31% 5% 7% 22% 24% 11%	1330
	21st to end	Night	15% 4 7% 21% 29% 24%	1330
July	1st to 10th	Night	15% 3 4 12% 23% 43%	2185
	11th to 20th	Night	14% 2 2 11% 25% 45%	2476
	21st to end	Night	17% 4 4 16% 28% 31%	3011
August	1st to 10th	Night	21% 3 4 13% 32% 27%	2838
	11th to 20th	Night	20% 3 4 24% 29% 22%	2838
	21st to end	Night	17% 2 5% 19% 28% 29%	3146
September	1st to 10th	Night	19% 4 4 14% 33% 26%	1958
	11th to 20th	Night	24% 4 8% 23% 23% 17%	2090
	21st to end	Night	23% 3 6% 24% 33% 11%	2090
October	1st to 10th	Night	20% 2 7% 20% 37% 13%	3676
	11th to 20th	Night	32% 3 7% 34% 17% 7%	3778
	21st to end	Night	39% 4 13% 26% 18% 1	4265
November	1st to 10th	Night	41% 5% 16% 25% 12% 1	2535
	11th to 20th	Night	46% 5% 16% 25% 6% 2	2739
	21st to end	Night	47% 4 19% 20% 9% 1	2800
December	1st to 10th	Night	55% 5% 18% 15% 6% 1	2800
	11th to 20th	Night	60% 5% 16% 17% 2	3491
	21st to end	Night	53% 5% 13% 18% 10% 1	5266

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	24% 9% 16% 21% 25% 6%	180
	11th to 20th	Day	22% 4 13% 34% 18% 8%	202
	21st to end	Day	26% 5% 16% 31% 18% 3	297
February	1st to 10th	Day	23% 11% 28% 26% 11% 2	270
	11th to 20th	Day	20% 6% 29% 30% 13% 2	270
	21st to end	Day	18% 13% 27% 30% 10% 2	377
March	1st to 10th	Day	15% 15% 26% 32% 10% 1	460
	11th to 20th	Day	11% 11% 29% 30% 18% 2	460
	21st to end	Day	16% 17% 30% 28% 8% 1	506
April	1st to 10th	Day	18% 16% 25% 27% 12% 1	460
	11th to 20th	Day	14% 21% 29% 24% 11% 1	452
	21st to end	Day	15% 13% 25% 27% 15% 4	460
May	1st to 10th	Day	14% 13% 26% 25% 17% 5%	463
	11th to 20th	Day	11% 12% 26% 28% 18% 6%	494
	21st to end	Day	16% 7% 21% 26% 22% 8%	734
June	1st to 10th	Day	9% 10% 22% 28% 24% 7%	680
	11th to 20th	Day	13% 13% 25% 29% 17% 3	680
	21st to end	Day	4 6% 22% 37% 25% 5%	680
July	1st to 10th	Day	4 4 24% 37% 25% 7%	671
	11th to 20th	Day	3 6% 24% 40% 25% 3	504
	21st to end	Day	3 5% 21% 34% 27% 11%	531
August	1st to 10th	Day	6% 5% 22% 30% 31% 7%	487
	11th to 20th	Day	4 5% 19% 28% 32% 12%	477
	21st to end	Day	6% 8% 21% 29% 24% 12%	539
September	1st to 10th	Day	5% 5% 22% 29% 29% 11%	490
	11th to 20th	Day	9% 8% 23% 27% 24% 8%	490
	21st to end	Day	9% 8% 19% 28% 26% 10%	490
October	1st to 10th	Day	10% 5% 18% 29% 28% 9%	376
	11th to 20th	Day	11% 10% 20% 21% 22% 16%	300
	21st to end	Day	17% 12% 21% 29% 18% 3	330
November	1st to 10th	Day	21% 8% 23% 27% 13% 8%	300
	11th to 20th	Day	14% 9% 26% 34% 15% 3	300
	21st to end	Day	18% 7% 21% 34% 19% 2	300
December	1st to 10th	Day	21% 6% 20% 28% 18% 7%	300
	11th to 20th	Day	34% 4 17% 27% 17% 1	270
	21st to end	Day	24% 8% 13% 28% 20% 7%	204
January	1st to 10th	Night	23% 4 15% 38% 18% 1	855
	11th to 20th	Night	25% 5% 18% 31% 18% 3	760
	21st to end	Night	23% 3 17% 41% 14% 2	836
February	1st to 10th	Night	25% 5% 21% 36% 12% 1	760
	11th to 20th	Night	21% 4 24% 38% 12% 2	744
	21st to end	Night	16% 8% 24% 38% 12% 3	628
March	1st to 10th	Night	17% 7% 21% 42% 12% 1	760
	11th to 20th	Night	14% 5% 25% 38% 16% 1	760
	21st to end	Night	16% 7% 24% 38% 14% 1	836
April	1st to 10th	Night	16% 7% 24% 39% 14% 1	703
	11th to 20th	Night	16% 7% 29% 37% 11% 1	563
	21st to end	Night	12% 5% 25% 39% 17% 1	570
May	1st to 10th	Night	9% 9% 27% 37% 18% 1	570
	11th to 20th	Night	9% 7% 23% 36% 23% 1	561
	21st to end	Night	13% 5% 22% 38% 19% 2	617
June	1st to 10th	Night	9% 6% 16% 41% 25% 3	437
	11th to 20th	Night	12% 3 27% 40% 17% 1	380
	21st to end	Night	3 2 16% 52% 25% 2	380
July	1st to 10th	Night	3 1 16% 49% 30% 2	370
	11th to 20th	Night	2 14% 63% 21%	377
	21st to end	Night	3 1 15% 48% 30% 2	624
August	1st to 10th	Night	5% 4 16% 47% 28% 1	567
	11th to 20th	Night	2 2 14% 50% 29% 2	564
	21st to end	Night	5% 2 19% 44% 28% 2	627
September	1st to 10th	Night	5% 2 16% 46% 27% 4	647
	11th to 20th	Night	7% 3 16% 40% 30% 5%	760
	21st to end	Night	10% 3 14% 40% 27% 6%	760
October	1st to 10th	Night	11% 4 16% 44% 23% 1	760
	11th to 20th	Night	14% 4 18% 39% 23% 3	760
	21st to end	Night	14% 6% 19% 42% 16% 4	836
November	1st to 10th	Night	18% 4 20% 38% 18% 1	780
	11th to 20th	Night	18% 6% 23% 39% 13% 1	939
	21st to end	Night	16% 5% 21% 38% 18% 2	1000
December	1st to 10th	Night	20% 5% 19% 40% 13% 2	1000
	11th to 20th	Night	25% 5% 17% 40% 12% 1	1000
	21st to end	Night	27% 6% 19% 34% 13% 1	1063

Page generated at 2024-12-21 02:13:49. Version ac07

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