Garden of he Gods Recreation Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Garden of he Gods Recreation Area clear sky chart from 2005-11-06 to 2025-01-22.

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	13% 8% 3 7% 4 4 4 4 5% 7% 42%	104923
	Night	14% 8% 3 6% 4 4 4 3 5% 6% 43%	104517
Transparency	Day	40% 5% 10% 25% 17% 3	108582
	Night	40% 4 10% 24% 18% 3	108999
Seeing	Day	17% 14% 27% 23% 14% 5%	15721
	Night	18% 13% 26% 27% 14% 2	25626

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	13% 13% 5% 9% 5% 4 4 3 4 4 34%	2607
	11th to 20th	Day	17% 9% 3 7% 6% 4 5% 3 5% 5% 36%	2648
	21st to end	Day	22% 16% 4 10% 3 3 3 3 3 4 27%	3144
February	1st to 10th	Day	16% 12% 4 7% 4 3 4 3 5% 5% 37%	1881
	11th to 20th	Day	15% 11% 4 8% 5% 3 4 3 4 6% 37%	1848
	21st to end	Day	15% 12% 3 7% 5% 4 4 4 5% 6% 34%	1570
March	1st to 10th	Day	21% 14% 4 6% 3 3 4 3 3 4 34%	3120
	11th to 20th	Day	14% 7% 3 5% 3 3 3 3 4 6% 50%	3293
	21st to end	Day	12% 8% 3 7% 5% 5% 5% 3 5% 6% 40%	4165
April	1st to 10th	Day	11% 8% 2 6% 4 4 4 3 6% 7% 44%	2280
	11th to 20th	Day	14% 8% 3 8% 4 4 4 4 5% 6% 41%	2254
	21st to end	Day	18% 7% 3 6% 4 4 4 3 5% 7% 40%	2280
May	1st to 10th	Day	15% 7% 3 8% 6% 5% 5% 5% 7% 9% 30%	4040
	11th to 20th	Day	17% 7% 2 6% 4 5% 5% 4 6% 7% 37%	4081
	21st to end	Day	10% 7% 2 7% 5% 5% 5% 4 7% 8% 40%	4691
June	1st to 10th	Day	10% 5% 3 6% 4 4 5% 4 6% 9% 44%	2660
	11th to 20th	Day	6% 4 2 5% 4 4 6% 4 7% 10% 48%	2660
	21st to end	Day	5% 5% 1 5% 5% 5% 6% 5% 8% 11% 44%	2660
July	1st to 10th	Day	11% 5% 2 6% 4 5% 5% 5% 8% 9% 41%	4440
	11th to 20th	Day	5% 3 2 5% 4 5% 5% 5% 7% 10% 50%	4440
	21st to end	Day	9% 8% 3 10% 6% 6% 7% 5% 7% 8% 31%	4778
August	1st to 10th	Day	7% 4 1 5% 3 4 4 4 7% 10% 52%	3785
	11th to 20th	Day	8% 5% 2 6% 5% 5% 5% 5% 7% 10% 42%	3729
	21st to end	Day	6% 4 1 4 3 3 4 4 6% 9% 57%	4180
September	1st to 10th	Day	10% 5% 3 6% 5% 4 5% 4 5% 6% 47%	2280
	11th to 20th	Day	10% 5% 2 6% 4 4 4 4 5% 7% 49%	2152
	21st to end	Day	12% 5% 1 4 4 3 4 3 5% 8% 51%	2090
October	1st to 10th	Day	9% 4 1 5% 3 3 3 3 4 7% 57%	2078
	11th to 20th	Day	12% 6% 2 5% 4 3 3 3 4 6% 52%	1900
	21st to end	Day	19% 7% 2 5% 3 3 3 3 4 6% 45%	1966
November	1st to 10th	Day	9% 5% 2 6% 4 4 4 4 5% 5% 52%	1762
	11th to 20th	Day	14% 8% 2 6% 4 4 4 3 4 6% 46%	1800
	21st to end	Day	18% 11% 3 5% 3 2 4 2 4 5% 42%	1800
December	1st to 10th	Day	12% 10% 3 6% 3 3 3 2 4 5% 49%	2871
	11th to 20th	Day	13% 11% 5% 10% 6% 4 3 3 5% 5% 35%	3008
	21st to end	Day	23% 15% 4 9% 5% 4 3 3 4 5% 25%	3982
January	1st to 10th	Night	17% 12% 4 7% 4 3 4 3 5% 6% 35%	4568
	11th to 20th	Night	15% 11% 5% 9% 5% 5% 5% 3 4 5% 32%	4541
	21st to end	Night	24% 13% 6% 8% 4 3 3 2 4 5% 28%	4546
February	1st to 10th	Night	19% 13% 4 8% 4 3 4 3 4 4 33%	2296
	11th to 20th	Night	15% 8% 4 7% 5% 4 3 3 4 6% 40%	2218
	21st to end	Night	19% 8% 4 8% 5% 4 4 3 4 4 37%	1884
March	1st to 10th	Night	24% 9% 3 6% 4 4 4 3 4 5% 36%	3733
	11th to 20th	Night	14% 6% 2 6% 4 3 3 3 4 7% 48%	3693
	21st to end	Night	15% 9% 3 7% 5% 4 4 4 5% 6% 38%	3466
April	1st to 10th	Night	12% 6% 2 6% 4 5% 4 4 4 8% 46%	1900
	11th to 20th	Night	16% 7% 2 5% 3 4 4 3 4 7% 45%	1875
	21st to end	Night	18% 7% 3 6% 4 4 4 4 5% 7% 37%	1900
May	1st to 10th	Night	17% 8% 2 6% 4 4 4 3 5% 8% 38%	2854
	11th to 20th	Night	15% 7% 3 6% 5% 4 3 3 4 7% 43%	2812
	21st to end	Night	8% 6% 2 6% 5% 5% 5% 4 7% 10% 43%	2867
June	1st to 10th	Night	11% 5% 2 5% 3 3 4 4 7% 8% 48%	1520
	11th to 20th	Night	5% 4 1 5% 3 3 5% 4 6% 9% 55%	1520
	21st to end	Night	4 3 1 4 4 4 5% 4 8% 12% 51%	1520
July	1st to 10th	Night	10% 5% 2 5% 4 4 4 4 6% 8% 49%	2530
	11th to 20th	Night	6% 4 1 4 3 4 3 4 5% 8% 59%	2530
	21st to end	Night	7% 7% 3 8% 6% 6% 5% 5% 8% 9% 36%	2779
August	1st to 10th	Night	5% 5% 1 4 3 4 4 3 5% 8% 58%	3144
	11th to 20th	Night	7% 4 2 5% 4 4 4 3 6% 8% 53%	3100
	21st to end	Night	4 3 1 4 3 4 4 4 5% 9% 59%	3476
September	1st to 10th	Night	11% 5% 2 5% 3 4 4 2 4 5% 54%	1900
	11th to 20th	Night	9% 5% 2 5% 4 4 4 3 6% 7% 52%	2008
	21st to end	Night	12% 5% 1 5% 4 3 4 3 5% 6% 53%	2090
October	1st to 10th	Night	8% 5% 2 5% 3 4 3 3 3 6% 59%	2099
	11th to 20th	Night	14% 5% 2 4 3 3 2 3 4 5% 55%	2280
	21st to end	Night	18% 8% 2 5% 3 3 2 3 4 5% 46%	2631
November	1st to 10th	Night	12% 5% 2 5% 3 3 3 3 4 6% 54%	2536
	11th to 20th	Night	14% 6% 2 6% 4 3 3 3 4 6% 50%	2600
	21st to end	Night	17% 7% 3 5% 4 4 3 3 4 5% 46%	2600
December	1st to 10th	Night	17% 10% 2 7% 4 3 3 2 3 5% 44%	4306
	11th to 20th	Night	17% 10% 3 5% 3 3 4 3 4 6% 42%	5199
	21st to end	Night	24% 14% 5% 8% 4 4 4 3 3 4 27%	6996

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	53% 4 9% 25% 9% 1	2608
	11th to 20th	Day	52% 4 8% 22% 13% 2	2648
	21st to end	Day	61% 3 8% 19% 8% 1	3144
February	1st to 10th	Day	50% 3 11% 23% 11% 2	1881
	11th to 20th	Day	50% 3 9% 21% 13% 3	1858
	21st to end	Day	50% 4 10% 18% 13% 5%	1570
March	1st to 10th	Day	55% 3 4 19% 13% 5%	3120
	11th to 20th	Day	37% 3 9% 29% 16% 5%	3293
	21st to end	Day	44% 5% 13% 22% 16% 1	4165
April	1st to 10th	Day	38% 5% 12% 26% 17% 2	2280
	11th to 20th	Day	44% 4 9% 22% 17% 3	2254
	21st to end	Day	45% 5% 9% 27% 12% 2	2280
May	1st to 10th	Day	47% 9% 13% 21% 9% 1	4078
	11th to 20th	Day	45% 7% 10% 24% 13% 1	4085
	21st to end	Day	39% 8% 10% 18% 22% 1	4704
June	1st to 10th	Day	35% 6% 13% 25% 19% 3	2660
	11th to 20th	Day	28% 8% 12% 27% 22% 3	2660
	21st to end	Day	31% 7% 15% 23% 18% 5%	2660
July	1st to 10th	Day	38% 6% 12% 26% 16% 3	4371
	11th to 20th	Day	28% 6% 13% 35% 16% 2	4365
	21st to end	Day	50% 6% 13% 22% 9% 1	4627
August	1st to 10th	Day	26% 6% 13% 34% 20% 1	3773
	11th to 20th	Day	36% 5% 12% 27% 17% 1	3765
	21st to end	Day	25% 5% 11% 36% 21% 3	4179
September	1st to 10th	Day	36% 5% 9% 26% 19% 5%	2280
	11th to 20th	Day	33% 5% 9% 25% 24% 3	2152
	21st to end	Day	33% 5% 7% 26% 25% 4	2090
October	1st to 10th	Day	17% 2 6% 23% 45% 7%	3455
	11th to 20th	Day	24% 3 8% 24% 33% 9%	3140
	21st to end	Day	32% 3 5% 28% 29% 4	3217
November	1st to 10th	Day	33% 5% 10% 26% 21% 5%	1762
	11th to 20th	Day	41% 3 7% 24% 21% 5%	1800
	21st to end	Day	46% 3 8% 25% 17% 3	1800
December	1st to 10th	Day	40% 2 10% 31% 16% 1	2871
	11th to 20th	Day	51% 4 8% 24% 11% 2	3005
	21st to end	Day	63% 3 12% 15% 7%	3982
January	1st to 10th	Night	50% 4 9% 26% 11% 1	4568
	11th to 20th	Night	55% 4 7% 22% 11% 2	4541
	21st to end	Night	60% 3 8% 19% 9% 1	4546
February	1st to 10th	Night	55% 3 9% 20% 12% 1	2296
	11th to 20th	Night	47% 3 8% 24% 16% 3	2219
	21st to end	Night	51% 3 9% 18% 15% 4	1884
March	1st to 10th	Night	51% 5% 6% 15% 19% 4	3733
	11th to 20th	Night	37% 4 13% 22% 17% 7%	3693
	21st to end	Night	45% 5% 11% 26% 13% 1	3466
April	1st to 10th	Night	38% 4 10% 27% 18% 3	1900
	11th to 20th	Night	40% 4 9% 23% 20% 5%	1875
	21st to end	Night	45% 6% 8% 23% 16% 3	1900
May	1st to 10th	Night	43% 8% 15% 24% 9% 1	2881
	11th to 20th	Night	41% 6% 12% 26% 14% 1	2813
	21st to end	Night	35% 8% 13% 25% 17% 2	2875
June	1st to 10th	Night	33% 6% 13% 24% 22% 3	1520
	11th to 20th	Night	25% 5% 15% 25% 26% 5%	1520
	21st to end	Night	24% 6% 17% 27% 19% 7%	1520
July	1st to 10th	Night	33% 6% 12% 28% 17% 4	2490
	11th to 20th	Night	25% 5% 12% 37% 17% 4	2482
	21st to end	Night	42% 6% 16% 23% 11% 1	2691
August	1st to 10th	Night	25% 5% 15% 36% 19% 1	3132
	11th to 20th	Night	29% 5% 14% 29% 20% 2	3130
	21st to end	Night	22% 5% 10% 37% 22% 3	3476
September	1st to 10th	Night	32% 4 8% 28% 22% 6%	1900
	11th to 20th	Night	31% 5% 7% 28% 24% 5%	2008
	21st to end	Night	32% 4 8% 25% 23% 7%	2090
October	1st to 10th	Night	18% 3 5% 16% 48% 10%	3502
	11th to 20th	Night	22% 2 5% 23% 40% 8%	3779
	21st to end	Night	32% 2 6% 24% 25% 11%	4330
November	1st to 10th	Night	32% 4 9% 25% 25% 6%	2536
	11th to 20th	Night	37% 3 7% 24% 22% 7%	2600
	21st to end	Night	42% 3 8% 25% 20% 2	2600
December	1st to 10th	Night	46% 3 8% 25% 18% 1	4306
	11th to 20th	Night	45% 3 10% 22% 18% 1	5201
	21st to end	Night	62% 3 9% 18% 7% 2	6996

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	28% 25% 30% 15% 2	300
	11th to 20th	Day	29% 30% 32% 8% 1	300
	21st to end	Day	24% 32% 33% 10% 1	300
February	1st to 10th	Day	23% 34% 29% 13% 1	270
	11th to 20th	Day	31% 32% 28% 8% 1	270
	21st to end	Day	34% 23% 31% 11% 1	225
March	1st to 10th	Day	24% 29% 34% 10% 3	270
	11th to 20th	Day	29% 27% 32% 10% 3	280
	21st to end	Day	29% 21% 31% 15% 4	506
April	1st to 10th	Day	19% 26% 31% 19% 5%	460
	11th to 20th	Day	23% 22% 26% 21% 8% 1	452
	21st to end	Day	23% 19% 34% 15% 8% 1	460
May	1st to 10th	Day	21% 18% 31% 20% 8% 1	463
	11th to 20th	Day	22% 10% 30% 23% 10% 4	487
	21st to end	Day	12% 9% 31% 27% 15% 6%	653
June	1st to 10th	Day	13% 6% 23% 27% 23% 7%	680
	11th to 20th	Day	6% 6% 25% 40% 17% 6%	680
	21st to end	Day	7% 7% 32% 31% 16% 7%	680
July	1st to 10th	Day	12% 3 19% 27% 23% 16%	671
	11th to 20th	Day	7% 4 20% 36% 23% 10%	668
	21st to end	Day	9% 4 22% 30% 29% 7%	734
August	1st to 10th	Day	10% 4 19% 32% 24% 12%	486
	11th to 20th	Day	14% 3 22% 29% 24% 8%	479
	21st to end	Day	11% 2 18% 28% 29% 12%	539
September	1st to 10th	Day	10% 4 21% 30% 25% 9%	490
	11th to 20th	Day	10% 4 15% 29% 31% 11%	490
	21st to end	Day	17% 9% 22% 22% 20% 9%	490
October	1st to 10th	Day	10% 6% 29% 30% 19% 6%	478
	11th to 20th	Day	18% 17% 36% 19% 8% 2	300
	21st to end	Day	27% 17% 34% 18% 4	330
November	1st to 10th	Day	14% 19% 36% 20% 11%	300
	11th to 20th	Day	18% 25% 32% 22% 4	300
	21st to end	Day	30% 19% 28% 16% 6% 1	300
December	1st to 10th	Day	22% 26% 31% 14% 5% 2	300
	11th to 20th	Day	26% 21% 34% 16% 3	300
	21st to end	Day	29% 27% 31% 12% 1	330
January	1st to 10th	Night	22% 24% 29% 21% 3	1000
	11th to 20th	Night	26% 26% 29% 15% 3	1000
	21st to end	Night	21% 23% 35% 20% 1	1051
February	1st to 10th	Night	26% 22% 32% 19% 2	776
	11th to 20th	Night	23% 25% 31% 20% 1	743
	21st to end	Night	26% 21% 34% 17% 1	628
March	1st to 10th	Night	23% 18% 33% 22% 4	760
	11th to 20th	Night	24% 16% 33% 21% 6%	717
	21st to end	Night	27% 14% 28% 25% 6%	627
April	1st to 10th	Night	15% 20% 35% 24% 7%	570
	11th to 20th	Night	21% 15% 27% 25% 12% 1	563
	21st to end	Night	22% 12% 31% 26% 8% 2	570
May	1st to 10th	Night	19% 9% 32% 29% 11% 1	570
	11th to 20th	Night	17% 8% 25% 32% 17% 2	561
	21st to end	Night	8% 4 26% 35% 23% 4	617
June	1st to 10th	Night	13% 3 19% 36% 26% 2	570
	11th to 20th	Night	6% 3 22% 43% 24% 2	570
	21st to end	Night	4 3 23% 40% 27% 3	570
July	1st to 10th	Night	9% 3 12% 32% 34% 10%	555
	11th to 20th	Night	7% 3 13% 36% 36% 6%	552
	21st to end	Night	8% 3 15% 35% 33% 6%	624
August	1st to 10th	Night	8% 1 12% 35% 37% 5%	567
	11th to 20th	Night	9% 2 14% 36% 35% 4	564
	21st to end	Night	8% 1 14% 33% 36% 7%	627
September	1st to 10th	Night	12% 3 15% 29% 35% 6%	570
	11th to 20th	Night	11% 3 16% 30% 35% 6%	678
	21st to end	Night	13% 7% 23% 27% 24% 5%	760
October	1st to 10th	Night	10% 7% 20% 35% 23% 5%	760
	11th to 20th	Night	16% 13% 29% 24% 15% 2	760
	21st to end	Night	23% 14% 31% 23% 9% 1	836
November	1st to 10th	Night	15% 12% 31% 29% 12% 1	780
	11th to 20th	Night	16% 18% 30% 28% 9% 1	800
	21st to end	Night	22% 17% 26% 26% 9%	800
December	1st to 10th	Night	23% 18% 29% 24% 5%	830
	11th to 20th	Night	24% 17% 29% 24% 6%	1000
	21st to end	Night	27% 22% 30% 17% 3	1100

Page generated at 2025-01-19 02:06:50. Version ac07

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