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 2024-11-02.

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% 48%	101507
	Night	6% 11% 4 8% 4 4 4 3 5% 7% 43%	97639
Transparency	Day	36% 6% 10% 19% 18% 11%	101250
	Night	39% 7% 12% 19% 16% 7%	97485
Seeing	Day	15% 17% 27% 24% 14% 3	14709
	Night	13% 13% 24% 32% 16% 2	23740

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	10% 20% 8% 12% 5% 5% 5% 4 6% 6% 19%	2539
	11th to 20th	Day	12% 20% 6% 11% 5% 6% 5% 3 4 5% 23%	2540
	21st to end	Day	8% 19% 6% 14% 7% 5% 5% 4 6% 6% 22%	3054
February	1st to 10th	Day	7% 17% 5% 11% 5% 5% 6% 4 6% 7% 28%	1710
	11th to 20th	Day	9% 17% 4 9% 6% 5% 5% 3 6% 7% 30%	1666
	21st to end	Day	6% 19% 7% 11% 6% 6% 5% 4 6% 7% 23%	1570
March	1st to 10th	Day	7% 17% 6% 12% 6% 5% 6% 4 6% 6% 26%	3197
	11th to 20th	Day	5% 14% 3 7% 4 3 3 3 5% 7% 44%	3490
	21st to end	Day	7% 19% 6% 12% 7% 6% 5% 5% 6% 7% 22%	3974
April	1st to 10th	Day	9% 18% 6% 9% 6% 5% 5% 3 5% 6% 27%	2280
	11th to 20th	Day	10% 16% 3 8% 5% 5% 4 3 5% 7% 35%	2249
	21st to end	Day	7% 15% 3 7% 4 3 4 4 5% 8% 40%	2338
May	1st to 10th	Day	11% 13% 3 6% 5% 4 4 3 5% 5% 41%	4379
	11th to 20th	Day	5% 7% 2 5% 3 4 3 3 5% 6% 58%	4377
	21st to end	Day	9% 9% 3 6% 5% 5% 5% 4 5% 8% 42%	4813
June	1st to 10th	Day	12% 10% 3 6% 5% 4 4 4 6% 6% 41%	2660
	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	8% 7% 3 6% 4 4 4 3 4 6% 51%	1900
	11th to 20th	Day	9% 9% 2 6% 5% 4 4 3 6% 9% 44%	1900
	21st to end	Day	11% 9% 3 8% 5% 4 5% 3 5% 6% 41%	2023
November	1st to 10th	Day	11% 15% 3 8% 6% 4 4 4 6% 7% 32%	1683
	11th to 20th	Day	12% 14% 4 7% 4 5% 6% 4 8% 7% 28%	1544
	21st to end	Day	7% 15% 5% 9% 7% 5% 5% 4 6% 8% 31%	1520
December	1st to 10th	Day	10% 11% 3 10% 6% 5% 5% 4 7% 8% 31%	1520
	11th to 20th	Day	9% 16% 5% 11% 6% 5% 5% 6% 8% 8% 20%	1928
	21st to end	Day	6% 15% 6% 15% 9% 7% 7% 4 6% 7% 18%	2794
January	1st to 10th	Night	10% 19% 6% 11% 7% 6% 6% 4 6% 7% 18%	4406
	11th to 20th	Night	10% 19% 7% 11% 6% 5% 5% 3 5% 7% 21%	4420
	21st to end	Night	8% 19% 6% 13% 6% 5% 5% 3 6% 7% 21%	4607
February	1st to 10th	Night	8% 16% 5% 10% 7% 5% 5% 4 6% 7% 28%	2470
	11th to 20th	Night	7% 15% 5% 10% 5% 5% 5% 4 6% 7% 31%	2399
	21st to end	Night	6% 18% 7% 9% 6% 5% 5% 5% 6% 7% 27%	1884
March	1st to 10th	Night	4 14% 5% 11% 6% 6% 6% 5% 7% 10% 25%	3674
	11th to 20th	Night	3 12% 4 7% 5% 3 4 3 6% 7% 45%	3490
	21st to end	Night	5% 18% 6% 13% 7% 7% 5% 5% 7% 7% 21%	3678
April	1st to 10th	Night	9% 17% 6% 9% 6% 3 4 3 4 7% 32%	1900
	11th to 20th	Night	7% 15% 6% 7% 5% 4 4 4 5% 7% 37%	1879
	21st to end	Night	7% 16% 3 7% 5% 4 5% 3 5% 7% 37%	1838
May	1st to 10th	Night	11% 16% 4 6% 3 3 3 3 4 5% 42%	2582
	11th to 20th	Night	4 6% 2 5% 3 3 3 3 5% 6% 61%	2516
	21st to end	Night	7% 13% 2 5% 4 3 4 4 4 5% 49%	2762
June	1st to 10th	Night	11% 11% 2 6% 4 3 3 4 4 6% 44%	1520
	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	6% 7% 2 5% 4 4 3 3 4 7% 56%	2280
	11th to 20th	Night	8% 7% 2 6% 4 4 4 4 4 7% 51%	2280
	21st to end	Night	9% 12% 2 8% 5% 4 4 3 6% 6% 41%	2574
November	1st to 10th	Night	12% 14% 4 8% 5% 5% 6% 3 5% 7% 31%	2430
	11th to 20th	Night	12% 13% 4 8% 5% 6% 5% 4 7% 9% 27%	2634
	21st to end	Night	6% 13% 3 9% 5% 5% 6% 5% 7% 10% 33%	2660
December	1st to 10th	Night	10% 13% 4 9% 5% 4 5% 4 6% 8% 32%	2660
	11th to 20th	Night	7% 16% 6% 12% 6% 6% 6% 5% 7% 8% 21%	3276
	21st to end	Night	7% 14% 5% 11% 7% 7% 6% 5% 6% 8% 24%	4862

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	60% 11% 12% 11% 4 1	2539
	11th to 20th	Day	62% 7% 9% 14% 5% 3	2540
	21st to end	Day	58% 10% 10% 15% 7% 2	3054
February	1st to 10th	Day	53% 8% 12% 17% 9%	1710
	11th to 20th	Day	53% 7% 14% 15% 10% 3	1675
	21st to end	Day	57% 8% 13% 12% 9% 1	1570
March	1st to 10th	Day	52% 7% 13% 16% 12% 1	3197
	11th to 20th	Day	38% 7% 12% 29% 14%	3490
	21st to end	Day	56% 10% 12% 16% 6%	3974
April	1st to 10th	Day	57% 7% 11% 15% 9% 2	2280
	11th to 20th	Day	49% 6% 14% 16% 12% 3	2252
	21st to end	Day	42% 7% 14% 24% 11% 2	2338
May	1st to 10th	Day	42% 6% 11% 22% 18% 1	4379
	11th to 20th	Day	26% 4 8% 25% 34% 3	4380
	21st to end	Day	36% 9% 17% 28% 10%	4814
June	1st to 10th	Day	42% 7% 11% 25% 14% 1	2660
	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	34% 6% 8% 17% 24% 10%	1900
	11th to 20th	Day	36% 6% 13% 21% 19% 5%	1900
	21st to end	Day	42% 8% 10% 18% 20% 3	2023
November	1st to 10th	Day	49% 7% 12% 16% 14% 1	1683
	11th to 20th	Day	51% 9% 15% 14% 9% 2	1544
	21st to end	Day	50% 6% 13% 13% 15% 3	1520
December	1st to 10th	Day	48% 8% 12% 21% 10% 2	1520
	11th to 20th	Day	54% 10% 13% 14% 8% 1	1928
	21st to end	Day	59% 10% 9% 16% 5% 1	2794
January	1st to 10th	Night	60% 11% 13% 11% 5%	4406
	11th to 20th	Night	59% 8% 10% 14% 5% 4	4420
	21st to end	Night	59% 8% 12% 12% 7% 1	4607
February	1st to 10th	Night	53% 8% 13% 14% 10% 1	2470
	11th to 20th	Night	51% 8% 14% 16% 8% 3	2401
	21st to end	Night	52% 10% 12% 15% 9% 2	1884
March	1st to 10th	Night	46% 10% 16% 19% 9% 1	3674
	11th to 20th	Night	35% 8% 13% 28% 15%	3490
	21st to end	Night	56% 11% 14% 14% 4	3678
April	1st to 10th	Night	53% 6% 16% 16% 8%	1900
	11th to 20th	Night	47% 8% 15% 19% 10% 2	1879
	21st to end	Night	45% 8% 15% 21% 11% 1	1838
May	1st to 10th	Night	42% 5% 15% 26% 12%	2582
	11th to 20th	Night	23% 5% 12% 30% 27% 2	2516
	21st to end	Night	35% 9% 26% 25% 5%	2762
June	1st to 10th	Night	42% 6% 12% 29% 10% 1	1520
	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	30% 5% 9% 21% 25% 10%	2280
	11th to 20th	Night	33% 6% 13% 21% 19% 7%	2280
	21st to end	Night	43% 6% 13% 15% 19% 4	2574
November	1st to 10th	Night	53% 5% 12% 14% 14% 3	2430
	11th to 20th	Night	51% 8% 12% 17% 9% 2	2634
	21st to end	Night	45% 9% 12% 14% 15% 5%	2660
December	1st to 10th	Night	47% 9% 12% 18% 11% 2	2660
	11th to 20th	Night	56% 10% 11% 14% 9% 1	3276
	21st to end	Night	52% 11% 12% 17% 7% 1	4862

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	29% 22% 26% 16% 7%	180
	11th to 20th	Day	29% 18% 26% 17% 8% 2	180
	21st to end	Day	21% 19% 28% 20% 11% 1	354
February	1st to 10th	Day	22% 23% 27% 20% 7%	370
	11th to 20th	Day	25% 29% 23% 17% 7%	366
	21st to end	Day	22% 24% 30% 18% 6% 1	382
March	1st to 10th	Day	25% 24% 30% 17% 3	460
	11th to 20th	Day	18% 22% 30% 22% 8% 1	460
	21st to end	Day	26% 24% 30% 14% 6%	506
April	1st to 10th	Day	25% 23% 27% 16% 7% 2	460
	11th to 20th	Day	27% 22% 27% 16% 6% 2	452
	21st to end	Day	20% 24% 27% 20% 9% 1	460
May	1st to 10th	Day	18% 20% 30% 21% 10% 2	463
	11th to 20th	Day	20% 19% 24% 20% 13% 4	488
	21st to end	Day	17% 14% 26% 24% 15% 4	529
June	1st to 10th	Day	14% 20% 23% 22% 15% 4	490
	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	19% 20% 25% 18% 13% 4	472
November	1st to 10th	Day	18% 20% 29% 22% 11%	273
	11th to 20th	Day	22% 15% 30% 23% 8% 2	192
	21st to end	Day	16% 22% 25% 30% 6% 1	180
December	1st to 10th	Day	18% 23% 25% 20% 12% 1	180
	11th to 20th	Day	24% 22% 30% 19% 4	180
	21st to end	Day	23% 22% 32% 18% 5%	198
January	1st to 10th	Night	21% 17% 29% 21% 10% 1	760
	11th to 20th	Night	19% 16% 26% 24% 14% 1	760
	21st to end	Night	18% 13% 25% 32% 11% 2	836
February	1st to 10th	Night	19% 18% 26% 27% 10% 1	760
	11th to 20th	Night	17% 17% 27% 28% 10%	744
	21st to end	Night	18% 18% 29% 28% 7%	628
March	1st to 10th	Night	17% 21% 24% 26% 9% 1	760
	11th to 20th	Night	13% 18% 26% 29% 12% 1	760
	21st to end	Night	16% 19% 31% 25% 9%	836
April	1st to 10th	Night	18% 16% 27% 26% 13% 1	760
	11th to 20th	Night	14% 20% 28% 23% 14% 2	751
	21st to end	Night	17% 13% 27% 28% 14% 1	698
May	1st to 10th	Night	13% 12% 25% 33% 16% 1	409
	11th to 20th	Night	13% 8% 21% 35% 22% 1	374
	21st to end	Night	15% 7% 22% 33% 22% 2	411
June	1st to 10th	Night	16% 9% 20% 38% 17% 1	380
	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	748
	11th to 20th	Night	20% 17% 23% 29% 9% 1	760
	21st to end	Night	13% 19% 26% 29% 12% 2	760
December	1st to 10th	Night	17% 15% 26% 27% 13% 1	760
	11th to 20th	Night	19% 18% 28% 25% 9% 1	760
	21st to end	Night	20% 24% 28% 22% 6%	836

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