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 2025-06-10.

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	6% 10% 3 7% 4 4 4 3 5% 6% 46%	123816
	Night	6% 11% 4 8% 5% 4 4 4 5% 7% 42%	123232
Transparency	Day	36% 6% 10% 20% 18% 9%	123560
	Night	39% 7% 12% 20% 16% 6%	123075
Seeing	Day	15% 17% 27% 24% 13% 3	15408
	Night	14% 13% 24% 32% 16% 2	24535

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% 21% 7% 11% 5% 5% 5% 5% 6% 5% 17%	3639
	11th to 20th	Day	8% 14% 4 8% 4 5% 4 5% 5% 6% 37%	3640
	21st to end	Day	6% 14% 4 10% 5% 3 4 3 5% 7% 38%	4390
February	1st to 10th	Day	7% 17% 5% 11% 5% 5% 6% 4 6% 7% 28%	1800
	11th to 20th	Day	9% 17% 5% 9% 5% 5% 5% 3 5% 7% 30%	1757
	21st to end	Day	6% 19% 7% 11% 6% 6% 5% 4 6% 7% 24%	1650
March	1st to 10th	Day	7% 15% 5% 11% 6% 5% 5% 4 6% 7% 28%	4603
	11th to 20th	Day	6% 17% 5% 11% 6% 4 4 3 5% 6% 32%	5000
	21st to end	Day	8% 18% 5% 12% 7% 6% 5% 5% 6% 6% 22%	5700
April	1st to 10th	Day	9% 18% 6% 9% 6% 5% 5% 4 5% 7% 27%	2400
	11th to 20th	Day	9% 15% 3 8% 4 5% 4 4 5% 7% 37%	2369
	21st to end	Day	7% 14% 3 7% 4 3 3 4 6% 8% 41%	2461
May	1st to 10th	Day	9% 10% 2 5% 4 3 4 3 5% 5% 49%	6266
	11th to 20th	Day	6% 8% 3 7% 5% 5% 4 4 5% 6% 46%	6277
	21st to end	Day	6% 7% 2 5% 4 4 4 3 6% 9% 49%	6902
June	1st to 10th	Day	11% 9% 3 6% 4 4 4 4 6% 6% 43%	2789
	11th to 20th	Day	7% 9% 2 6% 4 3 4 3 5% 6% 52%	2660
	21st to end	Day	4 4 1 4 2 4 3 3 4 6% 65%	2660
July	1st to 10th	Day	1 1 1 1 1 2 2 2 4 83%	4420
	11th to 20th	Day	2 2 2 2 2 3 3 3 4 78%	4420
	21st to end	Day	1 1 1 2 1 2 2 2 3 4 81%	4790
August	1st to 10th	Day	4 2 1 3 2 3 3 3 5% 6% 68%	4136
	11th to 20th	Day	1 2 1 3 3 3 3 3 4 7% 70%	4003
	21st to end	Day	4 3 1 3 2 2 2 2 3 5% 71%	4180
September	1st to 10th	Day	2 2 1 3 2 2 2 2 3 6% 75%	2280
	11th to 20th	Day	5% 5% 2 5% 4 4 5% 3 6% 6% 56%	2280
	21st to end	Day	7% 5% 2 4 3 3 4 3 5% 7% 57%	2030
October	1st to 10th	Day	5% 5% 2 4 3 3 3 3 3 6% 64%	3180
	11th to 20th	Day	6% 8% 3 6% 5% 5% 5% 4 6% 10% 44%	3161
	21st to end	Day	8% 11% 4 9% 5% 5% 6% 4 5% 6% 36%	3332
November	1st to 10th	Day	11% 15% 3 9% 6% 4 4 4 6% 7% 32%	1764
	11th to 20th	Day	11% 14% 4 8% 5% 5% 6% 4 8% 7% 26%	1625
	21st to end	Day	7% 14% 5% 9% 7% 5% 5% 4 6% 8% 31%	1600
December	1st to 10th	Day	7% 9% 2 8% 4 4 5% 4 7% 10% 41%	2620
	11th to 20th	Day	9% 17% 6% 14% 7% 6% 5% 5% 7% 6% 17%	3028
	21st to end	Day	5% 15% 6% 17% 9% 8% 7% 5% 6% 7% 16%	4004
January	1st to 10th	Night	12% 19% 6% 11% 7% 6% 7% 5% 6% 6% 16%	6306
	11th to 20th	Night	7% 13% 5% 8% 4 4 4 4 7% 8% 36%	6320
	21st to end	Night	6% 14% 5% 11% 5% 4 4 3 5% 7% 37%	6580
February	1st to 10th	Night	7% 16% 5% 10% 7% 5% 5% 4 6% 6% 27%	2600
	11th to 20th	Night	7% 16% 5% 10% 5% 5% 5% 4 5% 7% 30%	2528
	21st to end	Night	6% 17% 7% 9% 6% 5% 5% 5% 6% 7% 27%	1980
March	1st to 10th	Night	4 13% 5% 10% 6% 6% 6% 5% 8% 10% 28%	5288
	11th to 20th	Night	4 15% 6% 10% 5% 4 4 4 6% 7% 34%	5000
	21st to end	Night	7% 17% 6% 12% 7% 7% 6% 4 7% 7% 21%	5274
April	1st to 10th	Night	9% 16% 6% 9% 6% 3 4 3 4 7% 32%	2000
	11th to 20th	Night	7% 14% 5% 7% 4 4 4 4 5% 7% 38%	1979
	21st to end	Night	7% 15% 3 7% 5% 4 5% 3 5% 8% 38%	1935
May	1st to 10th	Night	9% 12% 3 5% 3 3 3 3 4 5% 51%	3696
	11th to 20th	Night	5% 10% 4 10% 5% 4 3 4 5% 5% 45%	3616
	21st to end	Night	6% 10% 2 4 3 3 3 3 4 5% 55%	3972
June	1st to 10th	Night	11% 11% 2 6% 4 3 3 4 4 6% 47%	1595
	11th to 20th	Night	6% 8% 2 5% 3 3 2 3 5% 8% 56%	1520
	21st to end	Night	4 3 1 3 2 3 3 3 4 5% 68%	1520
July	1st to 10th	Night	1 1 1 1 1 1 2 2 2 3 85%	2540
	11th to 20th	Night	2 1 1 2 1 1 2 1 3 5% 81%	2540
	21st to end	Night	1 1 1 2 2 1 2 2 3 3 83%	2761
August	1st to 10th	Night	2 3 1 4 2 2 2 2 4 5% 72%	2798
	11th to 20th	Night	1 2 1 4 2 2 2 2 3 5% 75%	2834
	21st to end	Night	3 2 1 3 2 2 2 2 3 5% 75%	3498
September	1st to 10th	Night	1 2 1 2 3 2 2 2 3 5% 78%	1900
	11th to 20th	Night	4 4 1 4 3 4 4 3 5% 6% 62%	1900
	21st to end	Night	6% 5% 1 4 3 3 3 3 5% 7% 60%	2147
October	1st to 10th	Night	4 5% 1 4 3 3 3 2 3 5% 68%	3800
	11th to 20th	Night	6% 7% 2 6% 4 5% 4 4 5% 8% 50%	3777
	21st to end	Night	7% 12% 3 9% 5% 5% 5% 4 6% 7% 36%	4232
November	1st to 10th	Night	12% 14% 4 9% 5% 5% 6% 3 5% 7% 31%	2535
	11th to 20th	Night	12% 13% 4 8% 5% 6% 5% 5% 7% 9% 26%	2773
	21st to end	Night	6% 13% 3 9% 5% 5% 5% 5% 6% 10% 33%	2800
December	1st to 10th	Night	6% 9% 3 7% 4 3 5% 4 8% 14% 38%	4560
	11th to 20th	Night	7% 18% 7% 14% 7% 6% 6% 5% 7% 8% 17%	5176
	21st to end	Night	9% 16% 5% 13% 7% 6% 6% 5% 6% 7% 20%	6952

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	63% 9% 11% 12% 5%	3639
	11th to 20th	Day	44% 6% 13% 21% 14% 3	3640
	21st to end	Day	43% 7% 8% 15% 20% 6%	4390
February	1st to 10th	Day	54% 8% 12% 17% 9% 1	1800
	11th to 20th	Day	53% 7% 13% 14% 10% 3	1766
	21st to end	Day	56% 8% 13% 12% 9% 2	1650
March	1st to 10th	Day	48% 6% 13% 20% 10% 3	4603
	11th to 20th	Day	50% 7% 11% 21% 11%	5000
	21st to end	Day	56% 10% 13% 16% 5%	5700
April	1st to 10th	Day	56% 7% 12% 15% 9% 2	2400
	11th to 20th	Day	47% 6% 13% 17% 14% 3	2372
	21st to end	Day	41% 7% 14% 25% 12% 2	2461
May	1st to 10th	Day	34% 6% 9% 25% 22% 4	6266
	11th to 20th	Day	34% 7% 10% 22% 25% 2	6280
	21st to end	Day	28% 8% 16% 34% 14%	6904
June	1st to 10th	Day	40% 7% 11% 26% 15% 1	2789
	11th to 20th	Day	33% 5% 11% 29% 18% 3	2660
	21st to end	Day	21% 4 10% 27% 28% 9%	2660
July	1st to 10th	Day	9% 3 5% 12% 20% 51%	4351
	11th to 20th	Day	11% 2 5% 9% 23% 50%	4345
	21st to end	Day	9% 2 5% 16% 36% 32%	4639
August	1st to 10th	Day	17% 4 7% 15% 33% 25%	4120
	11th to 20th	Day	14% 4 6% 26% 35% 15%	4042
	21st to end	Day	16% 3 6% 26% 28% 20%	4179
September	1st to 10th	Day	13% 2 6% 23% 35% 21%	2280
	11th to 20th	Day	27% 5% 9% 23% 26% 10%	2280
	21st to end	Day	27% 5% 10% 24% 23% 10%	2030
October	1st to 10th	Day	23% 4 9% 19% 30% 15%	3180
	11th to 20th	Day	34% 7% 17% 23% 16% 3	3161
	21st to end	Day	44% 7% 9% 20% 18% 2	3332
November	1st to 10th	Day	49% 7% 12% 16% 14% 1	1764
	11th to 20th	Day	52% 8% 15% 13% 9% 2	1625
	21st to end	Day	49% 6% 13% 13% 15% 3	1600
December	1st to 10th	Day	35% 7% 11% 24% 20% 3	2620
	11th to 20th	Day	60% 10% 13% 12% 5%	3028
	21st to end	Day	61% 10% 10% 14% 4 1	4004
January	1st to 10th	Night	61% 10% 12% 12% 4	6306
	11th to 20th	Night	42% 6% 12% 23% 13% 3	6320
	21st to end	Night	46% 6% 9% 14% 18% 7%	6580
February	1st to 10th	Night	54% 8% 13% 14% 10% 1	2600
	11th to 20th	Night	51% 7% 14% 16% 8% 3	2530
	21st to end	Night	52% 9% 13% 16% 9% 2	1980
March	1st to 10th	Night	42% 9% 17% 19% 9% 3	5288
	11th to 20th	Night	44% 8% 13% 23% 11%	5000
	21st to end	Night	56% 11% 13% 16% 4	5274
April	1st to 10th	Night	51% 6% 16% 17% 9%	2000
	11th to 20th	Night	45% 7% 14% 20% 12% 2	1979
	21st to end	Night	44% 8% 15% 21% 11% 1	1935
May	1st to 10th	Night	34% 5% 12% 24% 25% 1	3693
	11th to 20th	Night	38% 7% 12% 22% 20% 2	3616
	21st to end	Night	30% 7% 24% 32% 7%	3972
June	1st to 10th	Night	40% 6% 12% 30% 12% 1	1595
	11th to 20th	Night	27% 6% 14% 34% 16% 3	1520
	21st to end	Night	19% 4 11% 32% 26% 7%	1520
July	1st to 10th	Night	7% 2 6% 14% 24% 47%	2500
	11th to 20th	Night	10% 1 5% 15% 22% 46%	2492
	21st to end	Night	10% 1 4 16% 43% 26%	2674
August	1st to 10th	Night	16% 2 6% 19% 40% 16%	2790
	11th to 20th	Night	14% 2 6% 37% 32% 9%	2861
	21st to end	Night	14% 3 9% 29% 29% 17%	3498
September	1st to 10th	Night	11% 3 4 25% 39% 18%	1900
	11th to 20th	Night	23% 5% 10% 24% 28% 10%	1900
	21st to end	Night	24% 4 11% 23% 25% 13%	2147
October	1st to 10th	Night	21% 4 7% 23% 31% 14%	3800
	11th to 20th	Night	31% 6% 19% 24% 15% 4	3777
	21st to end	Night	43% 7% 12% 22% 13% 3	4232
November	1st to 10th	Night	52% 6% 12% 14% 14% 3	2535
	11th to 20th	Night	52% 9% 12% 16% 9% 2	2773
	21st to end	Night	45% 9% 12% 14% 15% 5%	2800
December	1st to 10th	Night	32% 7% 16% 23% 21% 2	4560
	11th to 20th	Night	61% 10% 13% 11% 6%	5176
	21st to end	Night	56% 11% 12% 14% 5% 1	6952

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% 26% 16% 6%	200
	11th to 20th	Day	27% 17% 27% 20% 9% 2	200
	21st to end	Day	20% 19% 27% 21% 12% 2	385
February	1st to 10th	Day	23% 23% 27% 19% 7%	400
	11th to 20th	Day	25% 28% 23% 17% 7%	397
	21st to end	Day	23% 23% 29% 18% 6%	414
March	1st to 10th	Day	24% 24% 30% 18% 3	500
	11th to 20th	Day	20% 24% 28% 20% 7% 1	500
	21st to end	Day	27% 23% 29% 15% 6%	550
April	1st to 10th	Day	24% 23% 27% 16% 8% 2	500
	11th to 20th	Day	25% 21% 28% 17% 6% 3	492
	21st to end	Day	19% 23% 27% 20% 10% 1	500
May	1st to 10th	Day	18% 19% 30% 21% 10% 2	503
	11th to 20th	Day	21% 21% 23% 20% 12% 3	528
	21st to end	Day	16% 14% 26% 25% 14% 4	573
June	1st to 10th	Day	14% 19% 24% 23% 15% 5%	527
	11th to 20th	Day	13% 22% 29% 24% 12% 1	490
	21st to end	Day	5% 12% 28% 31% 20% 5%	490
July	1st to 10th	Day	4 9% 32% 34% 18% 4	486
	11th to 20th	Day	3 8% 34% 31% 19% 5%	484
	21st to end	Day	2 9% 29% 32% 24% 5%	531
August	1st to 10th	Day	2 7% 27% 33% 23% 7%	487
	11th to 20th	Day	3 8% 23% 35% 21% 11%	477
	21st to end	Day	7% 9% 24% 33% 21% 7%	539
September	1st to 10th	Day	2 9% 27% 34% 22% 7%	490
	11th to 20th	Day	11% 9% 24% 34% 19% 3	490
	21st to end	Day	11% 15% 24% 29% 19% 3	490
October	1st to 10th	Day	13% 17% 25% 22% 20% 3	490
	11th to 20th	Day	18% 14% 24% 25% 17% 2	490
	21st to end	Day	20% 19% 25% 18% 13% 4	472
November	1st to 10th	Day	19% 20% 28% 22% 11%	300
	11th to 20th	Day	26% 15% 29% 21% 7% 2	213
	21st to end	Day	16% 23% 25% 30% 7% 1	200
December	1st to 10th	Day	17% 22% 26% 20% 15% 2	200
	11th to 20th	Day	25% 24% 30% 18% 4	200
	21st to end	Day	25% 22% 32% 16% 5%	220
January	1st to 10th	Night	22% 18% 29% 21% 9% 1	800
	11th to 20th	Night	18% 16% 26% 25% 14% 1	800
	21st to end	Night	17% 14% 25% 31% 11% 2	880
February	1st to 10th	Night	19% 18% 26% 27% 10% 1	800
	11th to 20th	Night	17% 18% 27% 27% 10%	784
	21st to end	Night	19% 18% 27% 28% 8%	660
March	1st to 10th	Night	18% 20% 25% 27% 9% 1	800
	11th to 20th	Night	14% 19% 26% 29% 12% 1	800
	21st to end	Night	18% 18% 29% 25% 9%	880
April	1st to 10th	Night	17% 16% 27% 27% 12% 1	800
	11th to 20th	Night	13% 20% 27% 24% 14% 2	791
	21st to end	Night	16% 13% 26% 29% 14% 1	735
May	1st to 10th	Night	13% 12% 25% 34% 17% 1	430
	11th to 20th	Night	14% 9% 22% 34% 21% 1	394
	21st to end	Night	14% 7% 22% 34% 21% 2	433
June	1st to 10th	Night	15% 8% 20% 38% 18% 1	399
	11th to 20th	Night	10% 8% 26% 40% 15% 1	380
	21st to end	Night	5% 4 20% 50% 20% 1	380
July	1st to 10th	Night	2 1 18% 55% 22% 1	370
	11th to 20th	Night	2 1 20% 58% 19% 1	368
	21st to end	Night	1 1 15% 58% 24% 1	416
August	1st to 10th	Night	2 2 11% 46% 36% 3	530
	11th to 20th	Night	3 1 9% 46% 38% 4	573
	21st to end	Night	2 4 22% 45% 25% 1	836
September	1st to 10th	Night	2 3 20% 43% 29% 2	760
	11th to 20th	Night	7% 6% 13% 40% 30% 4	760
	21st to end	Night	9% 6% 19% 35% 27% 3	760
October	1st to 10th	Night	9% 7% 26% 32% 22% 4	760
	11th to 20th	Night	13% 9% 20% 33% 22% 3	760
	21st to end	Night	18% 12% 22% 30% 15% 4	836
November	1st to 10th	Night	18% 14% 27% 29% 10% 1	780
	11th to 20th	Night	22% 17% 23% 28% 9% 1	800
	21st to end	Night	14% 19% 25% 28% 13% 2	800
December	1st to 10th	Night	16% 14% 26% 28% 15% 1	800
	11th to 20th	Night	20% 18% 28% 25% 9% 1	800
	21st to end	Night	21% 24% 28% 21% 6%	880

Page generated at 2025-06-07 07:28:19. Version ac07

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