Salina
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Salina clear sky chart from 2005-11-06 to 2025-10-19.

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	10% 6% 2 5% 4 4 4 3 5% 7% 52%	126677
	Night	9% 5% 2 5% 3 3 3 3 5% 7% 54%	123331
Transparency	Day	33% 4 11% 28% 21% 4	130357
	Night	30% 3 11% 27% 23% 5%	127715
Seeing	Day	13% 8% 30% 30% 16% 3	16965
	Night	12% 8% 34% 36% 10% 1	26770

By Month

Percentage Cloud Cover SE (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	11% 8% 3 8% 4 4 4 4 6% 8% 41%	4077
	11th to 20th	Day	7% 9% 4 9% 5% 5% 4 2 5% 6% 46%	4080
	21st to end	Day	7% 10% 4 7% 4 4 4 3 3 5% 49%	4488
February	1st to 10th	Day	9% 11% 3 7% 3 4 4 4 4 6% 45%	1800
	11th to 20th	Day	7% 8% 3 6% 4 5% 5% 3 4 7% 47%	1940
	21st to end	Day	7% 6% 2 6% 3 4 3 3 5% 8% 53%	1650
March	1st to 10th	Day	10% 6% 2 5% 3 3 3 2 3 6% 57%	4758
	11th to 20th	Day	9% 6% 2 4 2 3 3 3 4 6% 60%	4980
	21st to end	Day	10% 7% 3 6% 4 3 4 4 5% 7% 47%	5462
April	1st to 10th	Day	12% 7% 2 5% 4 4 4 3 5% 5% 51%	2200
	11th to 20th	Day	11% 7% 2 6% 5% 4 4 3 5% 7% 45%	2504
	21st to end	Day	17% 6% 2 6% 4 4 4 3 5% 7% 42%	2600
May	1st to 10th	Day	15% 7% 2 5% 4 3 4 3 5% 5% 47%	5862
	11th to 20th	Day	11% 5% 2 4 3 3 4 2 5% 6% 55%	5862
	21st to end	Day	19% 6% 2 5% 3 4 4 4 6% 7% 41%	6434
June	1st to 10th	Day	6% 4 2 4 3 4 3 4 5% 9% 57%	2600
	11th to 20th	Day	6% 4 2 4 4 5% 4 5% 6% 7% 54%	2600
	21st to end	Day	6% 3 1 4 4 4 4 5% 6% 7% 56%	2600
July	1st to 10th	Day	7% 4 2 5% 3 4 3 4 6% 8% 54%	5900
	11th to 20th	Day	7% 4 1 5% 4 4 5% 4 6% 10% 49%	5900
	21st to end	Day	7% 3 1 5% 4 4 4 4 6% 8% 53%	6422
August	1st to 10th	Day	6% 5% 2 6% 4 4 4 3 5% 7% 53%	4234
	11th to 20th	Day	11% 4 2 4 4 4 5% 4 6% 8% 50%	4171
	21st to end	Day	4 4 2 4 4 4 4 3 5% 8% 59%	4569
September	1st to 10th	Day	12% 5% 2 4 3 3 4 2 4 5% 57%	2200
	11th to 20th	Day	9% 4 2 5% 3 3 4 3 5% 7% 55%	2200
	21st to end	Day	9% 4 2 5% 3 4 4 3 4 6% 57%	2200
October	1st to 10th	Day	12% 4 1 5% 3 2 3 2 5% 6% 56%	2137
	11th to 20th	Day	10% 4 1 3 2 2 2 3 3 5% 64%	1980
	21st to end	Day	12% 5% 2 5% 3 3 4 2 4 4 57%	2085
November	1st to 10th	Day	9% 4 1 4 3 3 3 4 4 6% 60%	1763
	11th to 20th	Day	8% 5% 2 3 3 3 4 3 4 4 60%	1800
	21st to end	Day	11% 6% 1 3 3 2 2 2 3 5% 60%	1800
December	1st to 10th	Day	5% 4 1 4 3 3 3 3 4 5% 64%	2940
	11th to 20th	Day	7% 6% 2 5% 4 3 3 2 4 5% 59%	3391
	21st to end	Day	14% 11% 4 11% 4 4 3 3 4 6% 37%	4488
January	1st to 10th	Night	12% 8% 4 11% 4 4 3 3 4 6% 41%	5888
	11th to 20th	Night	5% 6% 2 7% 5% 5% 4 3 4 5% 53%	5900
	21st to end	Night	10% 9% 3 6% 4 3 3 3 4 6% 49%	6490
February	1st to 10th	Night	9% 10% 3 6% 5% 4 3 4 5% 6% 44%	2600
	11th to 20th	Night	9% 7% 2 7% 4 4 5% 3 5% 7% 47%	2363
	21st to end	Night	8% 5% 2 7% 4 3 3 3 4 5% 56%	1980
March	1st to 10th	Night	8% 5% 2 3 2 2 2 2 4 5% 64%	5103
	11th to 20th	Night	7% 4 1 3 2 3 3 4 6% 8% 58%	4980
	21st to end	Night	11% 7% 2 5% 4 4 4 3 5% 7% 49%	5467
April	1st to 10th	Night	10% 5% 2 4 3 3 3 3 5% 7% 53%	2200
	11th to 20th	Night	12% 4 2 5% 3 3 4 3 5% 8% 50%	1840
	21st to end	Night	15% 6% 2 5% 4 4 4 4 6% 6% 45%	1800
May	1st to 10th	Night	16% 6% 2 4 3 3 4 3 4 7% 49%	4053
	11th to 20th	Night	11% 4 1 4 2 3 3 3 5% 7% 56%	4053
	21st to end	Night	19% 4 2 4 3 2 3 3 5% 7% 48%	4443
June	1st to 10th	Night	6% 3 1 3 3 3 4 4 6% 10% 56%	1800
	11th to 20th	Night	4 4 2 4 3 5% 3 4 7% 10% 55%	1800
	21st to end	Night	5% 3 2 4 3 4 4 4 6% 9% 57%	1800
July	1st to 10th	Night	6% 5% 1 5% 3 4 5% 4 6% 8% 53%	4078
	11th to 20th	Night	5% 4 2 6% 3 4 5% 4 7% 10% 50%	4077
	21st to end	Night	7% 4 2 5% 4 4 4 4 5% 8% 53%	4449
August	1st to 10th	Night	4 3 1 5% 4 5% 5% 4 7% 10% 54%	2926
	11th to 20th	Night	9% 4 2 6% 4 4 4 3 5% 7% 53%	2888
	21st to end	Night	6% 3 1 3 3 3 3 3 5% 8% 62%	3334
September	1st to 10th	Night	9% 3 1 4 4 3 3 3 5% 6% 60%	2200
	11th to 20th	Night	9% 3 1 4 3 3 4 3 5% 7% 57%	2200
	21st to end	Night	7% 3 1 4 4 3 3 3 5% 7% 61%	2200
October	1st to 10th	Night	11% 4 1 4 3 3 3 3 5% 7% 56%	2241
	11th to 20th	Night	10% 5% 2 4 2 2 2 2 4 6% 61%	2377
	21st to end	Night	11% 4 2 4 2 3 2 3 4 5% 59%	2510
November	1st to 10th	Night	8% 4 2 3 2 2 2 2 4 6% 64%	2535
	11th to 20th	Night	8% 4 1 3 3 2 3 4 4 6% 62%	2600
	21st to end	Night	10% 6% 2 4 3 3 3 3 4 5% 58%	2600
December	1st to 10th	Night	4 4 1 4 3 3 3 2 4 5% 66%	4250
	11th to 20th	Night	8% 5% 2 5% 3 3 3 3 5% 6% 56%	4816
	21st to end	Night	14% 10% 3 8% 4 4 3 3 4 5% 41%	6490

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	41% 5% 12% 25% 15% 2	4078
	11th to 20th	Day	40% 5% 9% 23% 21% 2	4080
	21st to end	Day	40% 2 11% 27% 17% 3	4488
February	1st to 10th	Day	40% 4 15% 26% 11% 5%	1800
	11th to 20th	Day	38% 3 15% 26% 14% 5%	1950
	21st to end	Day	31% 3 8% 27% 24% 7%	1650
March	1st to 10th	Day	31% 2 7% 20% 27% 12%	4758
	11th to 20th	Day	28% 3 8% 22% 31% 10%	4980
	21st to end	Day	37% 4 14% 35% 9% 1	5464
April	1st to 10th	Day	34% 4 11% 26% 21% 4	2200
	11th to 20th	Day	38% 5% 11% 26% 17% 3	2504
	21st to end	Day	42% 4 11% 27% 15% 1	2600
May	1st to 10th	Day	40% 4 9% 25% 17% 4	5900
	11th to 20th	Day	31% 4 8% 24% 27% 7%	5866
	21st to end	Day	42% 5% 10% 26% 14% 2	6447
June	1st to 10th	Day	26% 5% 16% 34% 16% 3	2600
	11th to 20th	Day	28% 6% 12% 29% 20% 5%	2600
	21st to end	Day	25% 5% 13% 29% 21% 6%	2600
July	1st to 10th	Day	29% 3 13% 27% 25% 3	5836
	11th to 20th	Day	32% 3 14% 28% 20% 3	5831
	21st to end	Day	29% 4 12% 31% 22% 3	6240
August	1st to 10th	Day	31% 4 13% 26% 22% 4	4220
	11th to 20th	Day	33% 3 17% 26% 19% 3	4210
	21st to end	Day	24% 3 14% 31% 20% 7%	4568
September	1st to 10th	Day	30% 3 12% 24% 22% 9%	2200
	11th to 20th	Day	29% 4 10% 28% 25% 4	2200
	21st to end	Day	29% 4 8% 27% 27% 5%	2200
October	1st to 10th	Day	20% 2 6% 21% 43% 8%	3475
	11th to 20th	Day	18% 2 9% 32% 30% 9%	3220
	21st to end	Day	27% 2 8% 24% 32% 6%	3412
November	1st to 10th	Day	26% 4 11% 29% 25% 5%	1763
	11th to 20th	Day	28% 3 9% 25% 30% 5%	1800
	21st to end	Day	29% 3 11% 31% 23% 3	1800
December	1st to 10th	Day	24% 2 12% 38% 22% 2	2940
	11th to 20th	Day	30% 3 10% 41% 15% 1	3389
	21st to end	Day	49% 3 8% 28% 10% 1	4488
January	1st to 10th	Night	45% 3 11% 24% 15% 1	5888
	11th to 20th	Night	34% 3 10% 27% 22% 4	5900
	21st to end	Night	38% 3 10% 22% 19% 8%	6490
February	1st to 10th	Night	41% 4 11% 25% 14% 5%	2600
	11th to 20th	Night	37% 4 12% 27% 17% 4	2363
	21st to end	Night	32% 3 8% 23% 25% 10%	1980
March	1st to 10th	Night	24% 3 6% 27% 30% 10%	5103
	11th to 20th	Night	24% 3 7% 20% 33% 13%	4980
	21st to end	Night	36% 3 15% 34% 10% 1	5467
April	1st to 10th	Night	30% 4 13% 23% 24% 5%	2200
	11th to 20th	Night	33% 4 12% 25% 22% 3	1840
	21st to end	Night	39% 5% 12% 24% 17% 3	1800
May	1st to 10th	Night	37% 4 12% 23% 19% 6%	4080
	11th to 20th	Night	29% 4 12% 24% 20% 11%	4054
	21st to end	Night	36% 5% 14% 28% 16% 2	4452
June	1st to 10th	Night	23% 6% 18% 32% 18% 4	1800
	11th to 20th	Night	25% 5% 13% 33% 20% 5%	1800
	21st to end	Night	23% 4 14% 30% 23% 6%	1800
July	1st to 10th	Night	29% 3 14% 25% 23% 6%	4035
	11th to 20th	Night	28% 3 12% 29% 25% 3	4026
	21st to end	Night	30% 3 11% 34% 21% 2	4320
August	1st to 10th	Night	27% 4 15% 27% 21% 7%	2916
	11th to 20th	Night	33% 3 15% 26% 21% 2	2915
	21st to end	Night	21% 3 15% 32% 23% 6%	3334
September	1st to 10th	Night	26% 3 13% 24% 24% 11%	2200
	11th to 20th	Night	27% 4 10% 27% 27% 6%	2200
	21st to end	Night	24% 3 10% 23% 33% 7%	2200
October	1st to 10th	Night	19% 3 5% 17% 49% 7%	3670
	11th to 20th	Night	18% 2 7% 28% 33% 13%	3876
	21st to end	Night	22% 2 7% 27% 37% 5%	4134
November	1st to 10th	Night	24% 2 9% 28% 27% 9%	2535
	11th to 20th	Night	24% 3 9% 29% 28% 6%	2600
	21st to end	Night	30% 3 11% 28% 24% 5%	2600
December	1st to 10th	Night	22% 2 14% 38% 22% 2	4250
	11th to 20th	Night	28% 3 8% 36% 21% 3	4817
	21st to end	Night	46% 3 9% 29% 12% 1	6490

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	12% 15% 33% 27% 10% 2	300
	11th to 20th	Day	19% 15% 37% 23% 6%	300
	21st to end	Day	8% 9% 51% 25% 7%	330
February	1st to 10th	Day	18% 16% 42% 20% 3	300
	11th to 20th	Day	17% 15% 42% 20% 6% 1	300
	21st to end	Day	12% 21% 44% 17% 4 1	249
March	1st to 10th	Day	16% 12% 42% 25% 5%	300
	11th to 20th	Day	22% 14% 37% 19% 7% 1	300
	21st to end	Day	27% 13% 38% 16% 4 2	330
April	1st to 10th	Day	21% 16% 35% 21% 7%	300
	11th to 20th	Day	17% 14% 40% 24% 4	622
	21st to end	Day	19% 16% 36% 19% 8% 2	700
May	1st to 10th	Day	19% 10% 32% 27% 12% 1	703
	11th to 20th	Day	17% 10% 28% 25% 17% 3	725
	21st to end	Day	17% 9% 28% 27% 17% 3	789
June	1st to 10th	Day	6% 4 24% 35% 22% 9%	730
	11th to 20th	Day	7% 4 31% 36% 18% 3	730
	21st to end	Day	7% 5% 34% 38% 14% 2	730
July	1st to 10th	Day	8% 2 18% 38% 28% 6%	721
	11th to 20th	Day	5% 1 19% 39% 28% 8%	718
	21st to end	Day	7% 3 13% 40% 30% 7%	794
August	1st to 10th	Day	7% 2 19% 44% 25% 4	726
	11th to 20th	Day	7% 2 14% 43% 29% 4	715
	21st to end	Day	8% 3 18% 37% 26% 8%	749
September	1st to 10th	Day	14% 2 13% 42% 25% 5%	330
	11th to 20th	Day	6% 3 27% 37% 20% 6%	330
	21st to end	Day	12% 4 29% 26% 23% 5%	330
October	1st to 10th	Day	16% 8% 29% 25% 16% 5%	330
	11th to 20th	Day	6% 14% 43% 24% 12% 1	324
	21st to end	Day	19% 13% 35% 24% 8% 1	330
November	1st to 10th	Day	16% 12% 32% 30% 8% 2	300
	11th to 20th	Day	14% 16% 37% 21% 11% 1	300
	21st to end	Day	17% 8% 40% 23% 9% 2	300
December	1st to 10th	Day	9% 8% 42% 28% 10% 2	300
	11th to 20th	Day	12% 12% 43% 26% 7%	300
	21st to end	Day	18% 13% 40% 22% 7%	330
January	1st to 10th	Night	11% 9% 37% 36% 7%	1000
	11th to 20th	Night	11% 11% 39% 32% 7% 1	1000
	21st to end	Night	10% 10% 40% 35% 4	1100
February	1st to 10th	Night	16% 9% 41% 31% 3	1000
	11th to 20th	Night	13% 12% 41% 31% 3	809
	21st to end	Night	11% 12% 43% 29% 4	660
March	1st to 10th	Night	12% 14% 42% 28% 4	685
	11th to 20th	Night	17% 10% 36% 30% 8%	600
	21st to end	Night	22% 10% 40% 24% 4	660
April	1st to 10th	Night	13% 12% 43% 28% 5%	600
	11th to 20th	Night	15% 12% 38% 30% 4	593
	21st to end	Night	17% 11% 36% 28% 7%	600
May	1st to 10th	Night	17% 8% 35% 31% 9%	600
	11th to 20th	Night	13% 6% 29% 39% 12% 1	591
	21st to end	Night	14% 7% 28% 37% 12% 3	650
June	1st to 10th	Night	7% 3 30% 38% 21% 1	600
	11th to 20th	Night	5% 3 36% 40% 15% 1	600
	21st to end	Night	7% 4 37% 41% 11% 1	600
July	1st to 10th	Night	9% 3 19% 45% 24% 1	585
	11th to 20th	Night	4 2 23% 49% 20% 1	582
	21st to end	Night	7% 3 17% 48% 24% 1	657
August	1st to 10th	Night	5% 2 18% 51% 24% 1	597
	11th to 20th	Night	7% 3 17% 52% 21%	594
	21st to end	Night	7% 2 19% 45% 24% 3	660
September	1st to 10th	Night	10% 3 23% 45% 17% 2	600
	11th to 20th	Night	11% 3 27% 40% 17% 1	600
	21st to end	Night	9% 3 31% 41% 15% 1	600
October	1st to 10th	Night	14% 6% 29% 34% 17% 1	641
	11th to 20th	Night	12% 9% 36% 35% 8%	793
	21st to end	Night	14% 11% 34% 30% 11%	838
November	1st to 10th	Night	10% 8% 33% 39% 10%	975
	11th to 20th	Night	10% 11% 41% 31% 8%	1000
	21st to end	Night	13% 10% 32% 36% 9%	1000
December	1st to 10th	Night	11% 9% 36% 38% 6%	1000
	11th to 20th	Night	14% 10% 39% 32% 5%	1000
	21st to end	Night	15% 10% 36% 33% 6%	1100

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