Salt Fork State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Salt Fork State Park 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	16% 10% 3 8% 5% 5% 5% 4 5% 7% 33%	101217
	Night	17% 11% 4 8% 4 4 4 3 5% 6% 34%	98805
Transparency	Day	49% 6% 10% 22% 12% 1	104905
	Night	49% 5% 10% 21% 13% 2	103256
Seeing	Day	23% 12% 27% 21% 12% 5%	14872
	Night	22% 10% 25% 27% 13% 2	25067

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	20% 20% 6% 11% 4 4 3 3 4 6% 19%	2836
	11th to 20th	Day	15% 24% 8% 11% 7% 4 4 3 3 4 17%	2840
	21st to end	Day	27% 21% 7% 11% 6% 4 3 2 3 3 13%	3124
February	1st to 10th	Day	20% 16% 5% 10% 6% 4 3 3 4 4 25%	1710
	11th to 20th	Day	16% 15% 6% 12% 5% 4 3 3 5% 5% 25%	1739
	21st to end	Day	19% 15% 4 9% 5% 4 3 3 3 4 30%	1570
March	1st to 10th	Day	22% 16% 4 8% 5% 5% 4 3 4 5% 25%	3375
	11th to 20th	Day	13% 10% 3 8% 5% 5% 5% 3 5% 6% 36%	3480
	21st to end	Day	22% 9% 3 8% 5% 4 4 3 5% 6% 33%	3815
April	1st to 10th	Day	15% 13% 3 7% 6% 4 4 4 5% 7% 32%	2116
	11th to 20th	Day	17% 9% 3 7% 5% 5% 5% 3 5% 7% 35%	2383
	21st to end	Day	19% 8% 2 7% 5% 5% 4 4 6% 8% 32%	2470
May	1st to 10th	Day	22% 10% 3 7% 5% 5% 5% 4 5% 6% 27%	4082
	11th to 20th	Day	20% 9% 3 7% 4 4 4 3 6% 7% 33%	4081
	21st to end	Day	12% 6% 2 7% 6% 6% 6% 5% 7% 9% 35%	4476
June	1st to 10th	Day	12% 8% 2 6% 5% 5% 5% 6% 7% 8% 36%	2486
	11th to 20th	Day	12% 6% 3 8% 5% 5% 6% 6% 7% 8% 35%	2613
	21st to end	Day	11% 6% 2 6% 5% 6% 6% 5% 8% 9% 36%	2470
July	1st to 10th	Day	10% 7% 2 7% 5% 5% 5% 4 7% 9% 39%	4120
	11th to 20th	Day	9% 6% 2 6% 4 5% 5% 4 7% 9% 43%	4120
	21st to end	Day	12% 8% 3 7% 5% 5% 6% 5% 7% 9% 34%	4466
August	1st to 10th	Day	11% 6% 3 7% 6% 6% 6% 5% 7% 9% 33%	4104
	11th to 20th	Day	11% 7% 2 6% 5% 5% 6% 5% 8% 8% 37%	4044
	21st to end	Day	7% 4 2 6% 5% 5% 6% 4 7% 10% 45%	4418
September	1st to 10th	Day	14% 6% 2 5% 4 3 4 3 5% 8% 47%	2164
	11th to 20th	Day	9% 6% 2 5% 4 5% 5% 3 6% 10% 46%	2090
	21st to end	Day	19% 9% 2 6% 5% 4 3 3 4 7% 37%	2090
October	1st to 10th	Day	13% 8% 3 6% 5% 5% 4 3 6% 7% 42%	1967
	11th to 20th	Day	16% 8% 2 8% 4 5% 5% 4 5% 5% 38%	1900
	21st to end	Day	22% 9% 3 6% 4 4 4 2 4 5% 36%	2090
November	1st to 10th	Day	12% 9% 3 7% 4 4 3 3 4 6% 46%	1795
	11th to 20th	Day	18% 13% 3 7% 5% 4 4 3 6% 6% 32%	1800
	21st to end	Day	18% 15% 5% 9% 5% 4 4 4 4 5% 28%	1666
December	1st to 10th	Day	21% 17% 7% 10% 4 4 4 4 4 5% 20%	1600
	11th to 20th	Day	19% 18% 6% 11% 5% 4 4 3 4 6% 21%	1990
	21st to end	Day	23% 23% 5% 10% 6% 5% 4 3 3 5% 14%	3127
January	1st to 10th	Night	18% 21% 8% 12% 5% 5% 4 3 4 4 19%	4109
	11th to 20th	Night	16% 20% 6% 15% 5% 5% 6% 3 4 4 15%	4120
	21st to end	Night	28% 19% 7% 12% 4 3 2 2 3 3 17%	4532
February	1st to 10th	Night	21% 15% 4 9% 5% 4 4 3 4 4 26%	2470
	11th to 20th	Night	19% 15% 5% 10% 6% 5% 4 3 4 4 25%	2323
	21st to end	Night	21% 16% 4 9% 6% 4 4 2 4 5% 25%	1884
March	1st to 10th	Night	22% 13% 3 6% 4 4 3 2 4 5% 33%	3478
	11th to 20th	Night	16% 11% 4 8% 4 4 4 3 5% 6% 35%	3480
	21st to end	Night	19% 9% 2 6% 4 4 3 3 4 5% 39%	3817
April	1st to 10th	Night	18% 12% 3 7% 5% 4 4 3 5% 6% 34%	2062
	11th to 20th	Night	16% 8% 3 7% 4 4 4 4 6% 8% 36%	1761
	21st to end	Night	15% 9% 3 7% 4 4 5% 4 5% 7% 38%	1710
May	1st to 10th	Night	29% 9% 3 7% 4 5% 3 3 5% 6% 26%	2813
	11th to 20th	Night	18% 10% 3 6% 4 3 4 3 4 6% 40%	2812
	21st to end	Night	11% 5% 3 6% 5% 4 5% 5% 7% 9% 42%	3079
June	1st to 10th	Night	9% 6% 2 7% 5% 5% 4 4 6% 8% 44%	1676
	11th to 20th	Night	11% 5% 2 6% 4 4 4 4 8% 11% 43%	1546
	21st to end	Night	11% 5% 1 5% 5% 5% 4 4 6% 10% 44%	1710
July	1st to 10th	Night	10% 8% 2 7% 4 4 4 4 6% 8% 43%	2840
	11th to 20th	Night	10% 5% 2 6% 5% 4 5% 4 6% 8% 45%	2840
	21st to end	Night	8% 7% 3 7% 6% 5% 5% 4 7% 8% 40%	3087
August	1st to 10th	Night	8% 9% 3 9% 5% 4 6% 5% 8% 9% 35%	2825
	11th to 20th	Night	13% 8% 2 8% 4 4 4 3 5% 6% 43%	2785
	21st to end	Night	6% 4 2 5% 4 5% 6% 5% 7% 9% 47%	3204
September	1st to 10th	Night	12% 5% 2 6% 4 4 4 3 4 6% 50%	2013
	11th to 20th	Night	10% 4 1 4 3 4 4 3 6% 9% 53%	2090
	21st to end	Night	15% 8% 3 7% 4 4 4 3 5% 6% 43%	2090
October	1st to 10th	Night	14% 5% 2 6% 4 3 4 4 5% 6% 46%	2211
	11th to 20th	Night	15% 7% 3 7% 5% 5% 4 4 4 6% 40%	2280
	21st to end	Night	22% 8% 2 5% 4 3 4 3 5% 6% 37%	2508
November	1st to 10th	Night	13% 8% 2 6% 4 3 3 3 5% 7% 46%	2501
	11th to 20th	Night	19% 12% 3 7% 5% 4 4 4 5% 6% 33%	2600
	21st to end	Night	21% 13% 4 7% 4 4 5% 4 5% 6% 28%	2728
December	1st to 10th	Night	23% 15% 6% 10% 4 4 4 3 4 5% 22%	2800
	11th to 20th	Night	18% 19% 6% 9% 4 4 4 2 5% 6% 24%	3425
	21st to end	Night	23% 21% 5% 9% 5% 5% 4 3 4 5% 16%	4596

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	67% 5% 8% 13% 5%	2837
	11th to 20th	Day	72% 4 8% 12% 4 1	2840
	21st to end	Day	77% 4 6% 9% 3 1	3124
February	1st to 10th	Day	64% 3 10% 14% 8% 1	1710
	11th to 20th	Day	60% 5% 8% 17% 9% 1	1748
	21st to end	Day	60% 2 8% 19% 9% 2	1570
March	1st to 10th	Day	61% 4 8% 20% 6%	3375
	11th to 20th	Day	47% 7% 9% 26% 10% 1	3480
	21st to end	Day	51% 5% 9% 20% 14% 1	3815
April	1st to 10th	Day	52% 5% 10% 19% 11% 3	2116
	11th to 20th	Day	48% 5% 11% 17% 16% 3	2383
	21st to end	Day	50% 6% 9% 20% 13% 2	2470
May	1st to 10th	Day	56% 6% 8% 21% 8% 1	4120
	11th to 20th	Day	49% 6% 10% 22% 12% 1	4085
	21st to end	Day	41% 8% 13% 21% 12% 4	4489
June	1st to 10th	Day	43% 8% 11% 24% 13% 1	2486
	11th to 20th	Day	42% 7% 14% 23% 13% 1	2613
	21st to end	Day	41% 7% 14% 23% 13% 2	2470
July	1st to 10th	Day	40% 7% 12% 23% 15% 2	4055
	11th to 20th	Day	35% 7% 11% 30% 16% 1	4051
	21st to end	Day	43% 7% 12% 18% 17% 3	4324
August	1st to 10th	Day	43% 8% 14% 24% 11%	4091
	11th to 20th	Day	38% 8% 11% 31% 12% 1	4083
	21st to end	Day	32% 8% 13% 31% 13% 2	4418
September	1st to 10th	Day	37% 4 11% 23% 21% 4	2164
	11th to 20th	Day	34% 4 13% 27% 18% 3	2090
	21st to end	Day	48% 5% 9% 22% 17% 1	2090
October	1st to 10th	Day	29% 5% 9% 34% 22% 1	3266
	11th to 20th	Day	42% 6% 11% 22% 16% 5%	3140
	21st to end	Day	38% 4 12% 26% 19% 1	3428
November	1st to 10th	Day	40% 4 9% 28% 16% 3	1795
	11th to 20th	Day	53% 4 8% 22% 10% 3	1800
	21st to end	Day	58% 5% 9% 18% 8% 1	1666
December	1st to 10th	Day	66% 5% 10% 15% 4	1600
	11th to 20th	Day	65% 4 9% 17% 5%	1986
	21st to end	Day	73% 5% 9% 9% 3	3127
January	1st to 10th	Night	69% 4 8% 14% 4	4109
	11th to 20th	Night	72% 4 10% 11% 3	4120
	21st to end	Night	74% 3 6% 13% 3 1	4532
February	1st to 10th	Night	62% 4 9% 16% 8% 1	2470
	11th to 20th	Night	62% 4 8% 17% 8% 1	2325
	21st to end	Night	63% 4 8% 15% 9% 2	1884
March	1st to 10th	Night	54% 4 7% 24% 10%	3478
	11th to 20th	Night	48% 6% 9% 28% 7% 1	3480
	21st to end	Night	47% 5% 8% 27% 12% 2	3817
April	1st to 10th	Night	50% 5% 9% 19% 14% 2	2062
	11th to 20th	Night	45% 5% 12% 18% 18% 3	1761
	21st to end	Night	45% 5% 11% 21% 16% 2	1710
May	1st to 10th	Night	59% 5% 8% 18% 8% 2	2840
	11th to 20th	Night	45% 7% 9% 25% 12% 1	2813
	21st to end	Night	35% 8% 14% 24% 14% 4	3087
June	1st to 10th	Night	37% 7% 11% 25% 18% 3	1676
	11th to 20th	Night	33% 7% 16% 23% 18% 3	1546
	21st to end	Night	35% 8% 13% 25% 17% 2	1710
July	1st to 10th	Night	39% 6% 10% 22% 18% 5%	2795
	11th to 20th	Night	34% 8% 13% 27% 17% 2	2786
	21st to end	Night	39% 8% 11% 20% 19% 3	2988
August	1st to 10th	Night	41% 10% 14% 22% 12% 1	2814
	11th to 20th	Night	40% 6% 9% 23% 20% 1	2812
	21st to end	Night	30% 8% 14% 29% 15% 3	3204
September	1st to 10th	Night	36% 5% 11% 21% 22% 6%	2013
	11th to 20th	Night	29% 5% 12% 26% 25% 2	2090
	21st to end	Night	42% 4 10% 21% 21% 1	2090
October	1st to 10th	Night	31% 4 7% 28% 27% 2	3692
	11th to 20th	Night	36% 6% 11% 24% 17% 7%	3779
	21st to end	Night	34% 4 8% 28% 24% 3	4120
November	1st to 10th	Night	38% 4 11% 25% 18% 4	2501
	11th to 20th	Night	52% 4 9% 20% 13% 3	2600
	21st to end	Night	57% 4 11% 20% 7% 1	2728
December	1st to 10th	Night	65% 4 9% 16% 5% 1	2800
	11th to 20th	Night	62% 4 11% 18% 5%	3428
	21st to end	Night	70% 5% 9% 12% 4	4596

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	34% 21% 30% 10% 5%	270
	11th to 20th	Day	37% 24% 30% 8% 1	270
	21st to end	Day	36% 23% 30% 9% 2	297
February	1st to 10th	Day	34% 20% 33% 9% 3	270
	11th to 20th	Day	39% 23% 31% 5% 1	270
	21st to end	Day	38% 24% 32% 6%	225
March	1st to 10th	Day	31% 21% 29% 15% 5%	422
	11th to 20th	Day	31% 19% 31% 13% 5% 1	460
	21st to end	Day	33% 17% 31% 15% 4	506
April	1st to 10th	Day	28% 18% 32% 15% 7% 1	460
	11th to 20th	Day	28% 17% 28% 16% 8% 3	452
	21st to end	Day	27% 16% 35% 14% 6% 2	460
May	1st to 10th	Day	30% 15% 29% 16% 8% 2	463
	11th to 20th	Day	23% 10% 31% 22% 8% 6%	487
	21st to end	Day	15% 8% 25% 28% 17% 6%	529
June	1st to 10th	Day	18% 7% 28% 29% 14% 5%	490
	11th to 20th	Day	18% 9% 24% 31% 14% 6%	490
	21st to end	Day	13% 7% 32% 28% 15% 4	490
July	1st to 10th	Day	17% 4 20% 25% 19% 14%	485
	11th to 20th	Day	14% 5% 23% 30% 19% 9%	484
	21st to end	Day	15% 5% 22% 28% 18% 12%	532
August	1st to 10th	Day	13% 5% 19% 33% 21% 10%	486
	11th to 20th	Day	17% 5% 18% 32% 18% 10%	479
	21st to end	Day	11% 4 22% 30% 24% 10%	539
September	1st to 10th	Day	16% 5% 21% 29% 20% 9%	490
	11th to 20th	Day	11% 4 16% 29% 29% 11%	490
	21st to end	Day	25% 8% 23% 24% 15% 6%	490
October	1st to 10th	Day	16% 8% 27% 26% 19% 4	490
	11th to 20th	Day	21% 13% 29% 23% 12% 2	490
	21st to end	Day	29% 12% 31% 19% 8% 1	539
November	1st to 10th	Day	21% 15% 36% 15% 10% 3	333
	11th to 20th	Day	30% 15% 30% 17% 5% 2	300
	21st to end	Day	27% 23% 37% 12% 2	233
December	1st to 10th	Day	33% 21% 32% 9% 4 2	200
	11th to 20th	Day	34% 22% 30% 12% 4	200
	21st to end	Day	37% 18% 32% 10% 3	301
January	1st to 10th	Night	31% 17% 33% 14% 4	760
	11th to 20th	Night	32% 17% 31% 16% 3	760
	21st to end	Night	31% 19% 28% 19% 2	836
February	1st to 10th	Night	31% 17% 29% 21% 3	760
	11th to 20th	Night	30% 20% 32% 17% 1	743
	21st to end	Night	30% 17% 34% 17% 2	628
March	1st to 10th	Night	26% 17% 29% 24% 4	760
	11th to 20th	Night	26% 18% 27% 22% 6% 1	760
	21st to end	Night	29% 14% 31% 20% 5% 1	836
April	1st to 10th	Night	25% 15% 32% 23% 6%	760
	11th to 20th	Night	20% 13% 36% 22% 9% 1	637
	21st to end	Night	20% 9% 36% 28% 6% 1	570
May	1st to 10th	Night	22% 9% 27% 28% 13% 1	570
	11th to 20th	Night	21% 7% 23% 34% 14% 1	561
	21st to end	Night	12% 4 21% 36% 26% 3	617
June	1st to 10th	Night	11% 4 26% 37% 21% 1	536
	11th to 20th	Night	14% 4 22% 37% 23% 1	406
	21st to end	Night	13% 3 21% 38% 23% 2	570
July	1st to 10th	Night	11% 2 15% 40% 25% 6%	555
	11th to 20th	Night	10% 2 17% 38% 28% 5%	552
	21st to end	Night	10% 2 13% 40% 30% 4	624
August	1st to 10th	Night	8% 3 13% 41% 32% 3	567
	11th to 20th	Night	12% 3 12% 37% 32% 5%	564
	21st to end	Night	11% 1 17% 32% 33% 6%	668
September	1st to 10th	Night	14% 3 16% 33% 29% 5%	760
	11th to 20th	Night	11% 4 14% 36% 31% 5%	760
	21st to end	Night	18% 7% 21% 30% 19% 4	760
October	1st to 10th	Night	16% 5% 20% 33% 22% 3	760
	11th to 20th	Night	21% 10% 28% 29% 12% 1	760
	21st to end	Night	28% 10% 26% 27% 9% 1	836
November	1st to 10th	Night	19% 9% 29% 30% 13% 1	780
	11th to 20th	Night	27% 13% 29% 22% 8% 1	800
	21st to end	Night	30% 13% 27% 25% 5%	800
December	1st to 10th	Night	34% 14% 28% 19% 5%	800
	11th to 20th	Night	30% 15% 29% 21% 4	800
	21st to end	Night	34% 13% 30% 21% 2	851

Page generated at 2024-12-21 04:13:49. Version ac07

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