LaPine State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the LaPine State Park clear sky chart from 2005-11-06 to 2026-10-14.

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	5% 8% 3 6% 4 4 4 3 5% 7% 50%	158732
	Night	6% 10% 3 7% 4 4 4 3 5% 7% 45%	150393
Transparency	Day	33% 6% 10% 20% 21% 11%	153550
	Night	37% 6% 11% 21% 18% 7%	146571
Seeing	Day	15% 17% 27% 24% 14% 3	17183
	Night	14% 12% 24% 33% 16% 1	26166

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	12% 20% 7% 12% 5% 6% 5% 5% 5% 6% 17%	4722
	11th to 20th	Day	6% 11% 3 6% 3 4 4 4 6% 8% 46%	4740
	21st to end	Day	5% 12% 4 10% 5% 4 5% 4 7% 8% 36%	5681
February	1st to 10th	Day	7% 17% 5% 11% 5% 5% 6% 4 6% 7% 28%	1890
	11th to 20th	Day	8% 17% 4 10% 6% 5% 5% 3 5% 7% 29%	1847
	21st to end	Day	6% 18% 7% 11% 6% 6% 5% 4 6% 8% 24%	1730
March	1st to 10th	Day	7% 15% 5% 11% 6% 5% 5% 5% 6% 7% 28%	4705
	11th to 20th	Day	6% 17% 5% 10% 6% 4 4 4 5% 6% 32%	5110
	21st to end	Day	8% 18% 5% 11% 7% 6% 5% 5% 6% 6% 23%	5826
April	1st to 10th	Day	9% 17% 6% 9% 6% 5% 5% 4 5% 7% 27%	2520
	11th to 20th	Day	9% 15% 3 8% 5% 5% 4 4 5% 7% 36%	2489
	21st to end	Day	7% 14% 3 7% 4 3 4 4 5% 8% 41%	2584
May	1st to 10th	Day	7% 8% 2 5% 4 4 4 3 5% 6% 52%	8115
	11th to 20th	Day	5% 7% 3 6% 5% 4 4 4 5% 7% 50%	8160
	21st to end	Day	7% 7% 2 5% 4 4 4 3 5% 10% 50%	8992
June	1st to 10th	Day	11% 9% 2 6% 4 4 4 4 6% 6% 44%	2940
	11th to 20th	Day	6% 8% 2 6% 4 3 4 3 5% 6% 53%	2940
	21st to end	Day	4 4 1 4 3 4 3 3 4 6% 64%	2940
July	1st to 10th	Day	1 1 2 2 2 3 2 3 4 79%	8219
	11th to 20th	Day	2 2 1 3 2 2 2 3 3 4 76%	8220
	21st to end	Day	1 2 1 2 2 2 3 2 3 4 78%	8922
August	1st to 10th	Day	2 2 1 3 2 2 2 2 4 5% 75%	7644
	11th to 20th	Day	2 1 1 3 2 3 3 3 4 6% 71%	7514
	21st to end	Day	4 3 1 3 2 2 3 3 4 7% 67%	7750
September	1st to 10th	Day	2 2 1 3 2 3 2 3 4 6% 71%	2520
	11th to 20th	Day	5% 5% 2 5% 4 4 5% 3 6% 6% 56%	2520
	21st to end	Day	6% 5% 2 4 4 3 4 3 5% 6% 57%	2242
October	1st to 10th	Day	5% 5% 2 4 3 3 3 3 4 6% 63%	3380
	11th to 20th	Day	6% 8% 3 6% 5% 5% 5% 4 7% 9% 44%	3292
	21st to end	Day	8% 11% 4 9% 5% 5% 6% 4 5% 6% 36%	3438
November	1st to 10th	Day	11% 15% 3 8% 6% 4 4 4 6% 6% 32%	1854
	11th to 20th	Day	11% 14% 5% 8% 5% 5% 6% 4 8% 7% 27%	1706
	21st to end	Day	7% 14% 5% 9% 7% 5% 5% 4 6% 8% 31%	1680
December	1st to 10th	Day	8% 8% 2 8% 4 4 5% 4 7% 10% 40%	2700
	11th to 20th	Day	9% 17% 6% 14% 7% 6% 5% 5% 8% 6% 17%	3108
	21st to end	Day	6% 14% 6% 17% 9% 8% 7% 5% 6% 7% 16%	4092
January	1st to 10th	Night	11% 20% 6% 12% 7% 6% 7% 5% 6% 6% 15%	8172
	11th to 20th	Night	6% 10% 4 6% 4 3 3 3 8% 10% 43%	8220
	21st to end	Night	5% 13% 5% 12% 5% 5% 4 3 6% 9% 33%	8509
February	1st to 10th	Night	7% 16% 5% 10% 7% 5% 5% 4 6% 7% 28%	2730
	11th to 20th	Night	7% 16% 5% 10% 6% 5% 6% 4 5% 7% 30%	2658
	21st to end	Night	6% 17% 7% 9% 6% 5% 5% 5% 6% 7% 27%	2076
March	1st to 10th	Night	4 13% 5% 10% 6% 6% 6% 5% 8% 10% 28%	5406
	11th to 20th	Night	4 14% 6% 10% 5% 4 4 4 6% 7% 35%	5110
	21st to end	Night	7% 17% 5% 12% 7% 6% 5% 4 7% 7% 22%	5390
April	1st to 10th	Night	8% 16% 6% 9% 5% 3 5% 3 5% 7% 33%	2100
	11th to 20th	Night	7% 14% 5% 7% 5% 5% 4 4 5% 7% 37%	2079
	21st to end	Night	7% 15% 3 7% 5% 4 5% 3 5% 8% 39%	2032
May	1st to 10th	Night	7% 10% 2 4 3 3 3 3 4 5% 57%	4793
	11th to 20th	Night	4 9% 4 9% 5% 4 3 3 5% 6% 48%	4700
	21st to end	Night	7% 9% 2 4 3 3 3 3 4 6% 54%	5181
June	1st to 10th	Night	11% 10% 2 6% 4 3 3 4 4 6% 47%	1680
	11th to 20th	Night	5% 7% 2 5% 3 3 2 3 5% 8% 56%	1680
	21st to end	Night	4 4 2 4 3 3 3 3 4 5% 67%	1680
July	1st to 10th	Night	1 1 1 3 2 2 2 2 3 3 80%	4740
	11th to 20th	Night	3 2 1 2 2 2 2 1 3 4 79%	4740
	21st to end	Night	2 2 1 2 2 2 2 2 3 4 78%	5153
August	1st to 10th	Night	1 2 1 3 2 2 2 3 4 5% 74%	5169
	11th to 20th	Night	1 2 1 3 2 2 3 2 4 6% 75%	5342
	21st to end	Night	3 2 1 4 2 2 2 3 4 5% 71%	6499
September	1st to 10th	Night	2 2 1 3 3 2 3 3 4 5% 74%	2100
	11th to 20th	Night	4 4 1 4 3 4 4 3 5% 7% 61%	2100
	21st to end	Night	6% 5% 1 5% 3 4 3 3 5% 7% 60%	2374
October	1st to 10th	Night	4 5% 1 4 3 3 3 2 3 5% 68%	4040
	11th to 20th	Night	6% 7% 2 6% 4 5% 4 4 5% 8% 49%	3933
	21st to end	Night	7% 11% 3 9% 5% 5% 5% 4 6% 7% 36%	4368
November	1st to 10th	Night	12% 14% 4 9% 5% 5% 5% 3 5% 8% 31%	2665
	11th to 20th	Night	12% 13% 4 8% 5% 6% 5% 5% 7% 9% 26%	2912
	21st to end	Night	6% 13% 3 9% 5% 5% 5% 5% 6% 10% 33%	2940
December	1st to 10th	Night	6% 9% 3 7% 4 3 5% 4 7% 14% 38%	4700
	11th to 20th	Night	7% 18% 6% 14% 7% 6% 6% 5% 7% 8% 17%	5316
	21st to end	Night	9% 16% 5% 13% 7% 6% 6% 5% 6% 7% 20%	7106

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	62% 9% 12% 12% 5%	4723
	11th to 20th	Day	34% 5% 11% 21% 21% 9%	4740
	21st to end	Day	42% 8% 8% 16% 20% 6%	5681
February	1st to 10th	Day	53% 8% 13% 17% 9% 1	1890
	11th to 20th	Day	54% 7% 13% 15% 10% 3	1856
	21st to end	Day	57% 7% 13% 12% 9% 2	1730
March	1st to 10th	Day	48% 7% 13% 20% 10% 3	4705
	11th to 20th	Day	50% 7% 11% 21% 11% 1	5110
	21st to end	Day	55% 10% 13% 16% 6%	5826
April	1st to 10th	Day	55% 7% 12% 16% 8% 2	2520
	11th to 20th	Day	47% 6% 13% 18% 13% 3	2492
	21st to end	Day	41% 7% 14% 24% 12% 2	2584
May	1st to 10th	Day	30% 6% 9% 27% 24% 4	8115
	11th to 20th	Day	30% 6% 12% 25% 26% 1	8163
	21st to end	Day	28% 7% 15% 32% 17% 1	8994
June	1st to 10th	Day	40% 7% 11% 26% 16% 2	2940
	11th to 20th	Day	32% 5% 11% 28% 22% 4	2940
	21st to end	Day	22% 4 11% 27% 27% 9%	2940
July	1st to 10th	Day	10% 3 5% 19% 30% 33%	8151
	11th to 20th	Day	13% 2 5% 9% 23% 48%	8145
	21st to end	Day	11% 2 5% 22% 37% 23%	8723
August	1st to 10th	Day	12% 3 5% 12% 31% 38%	6048
	11th to 20th	Day	14% 4 7% 27% 36% 12%	5925
	21st to end	Day	15% 3 5% 27% 34% 16%	6077
September	1st to 10th	Day	15% 3 7% 22% 34% 19%	2520
	11th to 20th	Day	26% 5% 9% 23% 26% 10%	2520
	21st to end	Day	27% 5% 10% 24% 23% 11%	2242
October	1st to 10th	Day	23% 4 9% 19% 30% 15%	3380
	11th to 20th	Day	34% 7% 17% 23% 16% 3	3292
	21st to end	Day	44% 7% 10% 21% 17% 2	3438
November	1st to 10th	Day	49% 7% 12% 17% 13% 1	1854
	11th to 20th	Day	52% 8% 15% 13% 9% 2	1706
	21st to end	Day	49% 6% 14% 14% 14% 3	1680
December	1st to 10th	Day	36% 8% 11% 23% 19% 3	2700
	11th to 20th	Day	60% 10% 12% 12% 5% 1	3108
	21st to end	Day	61% 10% 11% 14% 4 1	4092
January	1st to 10th	Night	61% 10% 13% 12% 3	8172
	11th to 20th	Night	34% 5% 10% 23% 18% 9%	8220
	21st to end	Night	47% 6% 9% 13% 20% 6%	8509
February	1st to 10th	Night	53% 8% 13% 14% 10% 2	2730
	11th to 20th	Night	52% 7% 13% 16% 8% 3	2660
	21st to end	Night	52% 9% 13% 15% 10% 1	2076
March	1st to 10th	Night	43% 9% 17% 19% 9% 3	5406
	11th to 20th	Night	43% 8% 14% 23% 11% 1	5110
	21st to end	Night	55% 11% 13% 16% 5%	5390
April	1st to 10th	Night	50% 6% 16% 18% 8%	2100
	11th to 20th	Night	46% 7% 14% 20% 11% 2	2079
	21st to end	Night	43% 8% 14% 22% 12% 1	2032
May	1st to 10th	Night	28% 4 11% 29% 27% 1	4791
	11th to 20th	Night	35% 6% 13% 26% 18% 1	4700
	21st to end	Night	29% 7% 21% 32% 11%	5182
June	1st to 10th	Night	40% 6% 11% 30% 12% 1	1680
	11th to 20th	Night	26% 6% 13% 34% 18% 3	1680
	21st to end	Night	20% 4 12% 31% 26% 7%	1680
July	1st to 10th	Night	11% 2 6% 27% 29% 25%	4700
	11th to 20th	Night	12% 1 4 15% 25% 42%	4692
	21st to end	Night	13% 2 4 28% 38% 16%	5040
August	1st to 10th	Night	11% 2 5% 14% 38% 30%	4090
	11th to 20th	Night	12% 3 10% 34% 35% 7%	4206
	21st to end	Night	14% 2 7% 28% 36% 12%	5092
September	1st to 10th	Night	13% 3 5% 25% 36% 17%	2100
	11th to 20th	Night	23% 5% 9% 25% 28% 10%	2100
	21st to end	Night	24% 4 11% 23% 25% 13%	2374
October	1st to 10th	Night	22% 4 7% 23% 31% 14%	4040
	11th to 20th	Night	31% 6% 19% 24% 15% 5%	3933
	21st to end	Night	43% 7% 12% 22% 13% 3	4368
November	1st to 10th	Night	52% 5% 13% 14% 13% 3	2665
	11th to 20th	Night	52% 9% 12% 16% 9% 2	2912
	21st to end	Night	45% 9% 13% 15% 15% 5%	2940
December	1st to 10th	Night	32% 7% 16% 23% 20% 2	4700
	11th to 20th	Night	60% 9% 13% 11% 6% 1	5316
	21st to end	Night	56% 11% 12% 14% 5% 1	7106

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	31% 22% 27% 15% 5%	220
	11th to 20th	Day	24% 15% 24% 22% 12% 2	220
	21st to end	Day	19% 19% 29% 21% 12% 1	415
February	1st to 10th	Day	23% 22% 27% 20% 8%	430
	11th to 20th	Day	24% 28% 25% 17% 6%	427
	21st to end	Day	25% 22% 29% 17% 5%	446
March	1st to 10th	Day	23% 25% 30% 17% 3	540
	11th to 20th	Day	21% 25% 29% 19% 7% 1	540
	21st to end	Day	27% 23% 29% 15% 6%	594
April	1st to 10th	Day	23% 22% 27% 16% 9% 2	540
	11th to 20th	Day	25% 21% 28% 17% 6% 2	532
	21st to end	Day	18% 23% 27% 21% 10% 1	540
May	1st to 10th	Day	16% 19% 30% 21% 11% 2	543
	11th to 20th	Day	21% 21% 23% 20% 12% 3	568
	21st to end	Day	16% 15% 25% 25% 14% 4	617
June	1st to 10th	Day	14% 19% 25% 23% 14% 5%	570
	11th to 20th	Day	12% 20% 28% 26% 12% 1	570
	21st to end	Day	6% 12% 28% 30% 20% 5%	570
July	1st to 10th	Day	4 9% 30% 33% 19% 5%	566
	11th to 20th	Day	3 9% 35% 30% 18% 5%	564
	21st to end	Day	2 10% 29% 31% 23% 5%	619
August	1st to 10th	Day	2 7% 27% 32% 24% 8%	567
	11th to 20th	Day	3 8% 22% 34% 22% 11%	557
	21st to end	Day	6% 9% 25% 33% 20% 7%	627
September	1st to 10th	Day	4 8% 26% 34% 22% 6%	570
	11th to 20th	Day	10% 9% 24% 33% 19% 4	570
	21st to end	Day	11% 14% 24% 28% 20% 4	570
October	1st to 10th	Day	13% 16% 24% 23% 21% 4	570
	11th to 20th	Day	18% 14% 24% 25% 16% 2	543
	21st to end	Day	20% 18% 26% 19% 13% 4	512
November	1st to 10th	Day	20% 19% 28% 23% 10%	330
	11th to 20th	Day	25% 15% 29% 22% 7% 2	234
	21st to end	Day	15% 21% 26% 30% 6% 1	220
December	1st to 10th	Day	19% 21% 26% 19% 13% 2	220
	11th to 20th	Day	25% 23% 28% 18% 5%	220
	21st to end	Day	27% 21% 30% 16% 5%	242
January	1st to 10th	Night	23% 17% 28% 21% 9% 1	840
	11th to 20th	Night	17% 15% 25% 27% 15% 1	840
	21st to end	Night	16% 13% 26% 31% 11% 2	924
February	1st to 10th	Night	18% 18% 26% 28% 10% 1	840
	11th to 20th	Night	17% 18% 27% 28% 10%	824
	21st to end	Night	20% 18% 27% 27% 7%	692
March	1st to 10th	Night	18% 20% 25% 27% 9% 1	840
	11th to 20th	Night	14% 19% 28% 28% 11% 1	840
	21st to end	Night	18% 18% 30% 25% 9%	924
April	1st to 10th	Night	16% 16% 27% 27% 13% 1	840
	11th to 20th	Night	13% 20% 27% 25% 14% 2	831
	21st to end	Night	16% 13% 26% 30% 14% 1	772
May	1st to 10th	Night	12% 11% 24% 35% 16% 1	451
	11th to 20th	Night	13% 9% 23% 34% 20% 1	414
	21st to end	Night	14% 7% 21% 35% 21% 2	455
June	1st to 10th	Night	15% 8% 21% 38% 17%	420
	11th to 20th	Night	9% 7% 26% 42% 15%	420
	21st to end	Night	6% 5% 19% 50% 19%	420
July	1st to 10th	Night	2 1 18% 56% 22% 1	410
	11th to 20th	Night	2 1 20% 58% 17% 1	408
	21st to end	Night	2 1 16% 56% 24% 1	460
August	1st to 10th	Night	2 1 11% 47% 35% 3	586
	11th to 20th	Night	3 1 9% 47% 37% 3	635
	21st to end	Night	2 3 22% 45% 26% 1	924
September	1st to 10th	Night	3 3 20% 44% 28% 2	840
	11th to 20th	Night	7% 6% 15% 39% 29% 4	840
	21st to end	Night	9% 6% 19% 36% 27% 3	840
October	1st to 10th	Night	9% 7% 25% 32% 23% 3	840
	11th to 20th	Night	13% 10% 20% 33% 21% 3	812
	21st to end	Night	18% 12% 22% 30% 15% 4	880
November	1st to 10th	Night	19% 14% 27% 29% 10% 1	820
	11th to 20th	Night	22% 17% 23% 28% 9% 1	840
	21st to end	Night	13% 19% 25% 29% 12% 1	840
December	1st to 10th	Night	17% 15% 25% 27% 14% 1	840
	11th to 20th	Night	20% 18% 28% 24% 9% 1	840
	21st to end	Night	21% 24% 27% 21% 6%	924

Page generated at 2026-10-11 02:06:27. Version ac07

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