Gates of Lodore
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Gates of Lodore clear sky chart from 2005-11-06 to 2024-10-24.

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	3 5% 2 6% 4 4 5% 5% 7% 9% 51%	101237
	Night	3 6% 2 6% 4 5% 5% 5% 7% 8% 49%	97788
Transparency	Day	27% 8% 13% 23% 19% 11%	100993
	Night	28% 8% 14% 23% 19% 8%	97621
Seeing	Day	7% 14% 27% 31% 17% 4	15459
	Night	6% 7% 22% 43% 19% 3	25571

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	1 5% 2 9% 7% 7% 7% 7% 9% 9% 36%	2669
	11th to 20th	Day	1 7% 2 12% 5% 6% 6% 6% 8% 9% 38%	2860
	21st to end	Day	2 9% 4 13% 7% 6% 8% 7% 6% 9% 30%	3146
February	1st to 10th	Day	1 7% 4 7% 5% 5% 5% 5% 6% 10% 44%	1710
	11th to 20th	Day	2 9% 3 8% 4 4 5% 4 7% 10% 43%	1665
	21st to end	Day	1 7% 2 9% 5% 6% 7% 4 6% 9% 44%	1533
March	1st to 10th	Day	2 7% 4 7% 5% 5% 5% 4 6% 10% 44%	3444
	11th to 20th	Day	3 10% 3 5% 3 4 4 4 6% 12% 46%	3490
	21st to end	Day	2 12% 4 10% 7% 5% 6% 6% 8% 9% 32%	3825
April	1st to 10th	Day	4 8% 2 6% 5% 5% 5% 5% 6% 9% 46%	2247
	11th to 20th	Day	4 9% 3 9% 5% 4 5% 4 5% 9% 43%	2251
	21st to end	Day	4 7% 2 7% 5% 5% 5% 5% 7% 10% 44%	2406
May	1st to 10th	Day	7% 11% 3 8% 6% 5% 6% 4 7% 8% 36%	4110
	11th to 20th	Day	4 5% 2 5% 4 5% 5% 5% 8% 10% 47%	4189
	21st to end	Day	5% 5% 2 4 4 4 5% 5% 7% 9% 51%	4825
June	1st to 10th	Day	3 3 1 4 3 4 5% 5% 8% 9% 56%	2660
	11th to 20th	Day	3 3 1 4 4 3 4 4 6% 8% 60%	2660
	21st to end	Day	2 2 1 3 3 3 4 4 7% 7% 64%	2660
July	1st to 10th	Day	2 1 1 2 2 3 3 3 5% 6% 73%	4430
	11th to 20th	Day	2 2 1 3 4 5% 7% 7% 10% 11% 49%	4214
	21st to end	Day	2 2 1 4 4 4 5% 4 7% 8% 60%	4454
August	1st to 10th	Day	2 2 1 4 3 4 5% 5% 9% 9% 54%	4092
	11th to 20th	Day	2 2 1 3 3 4 5% 5% 7% 10% 59%	4028
	21st to end	Day	2 2 1 3 3 3 4 4 6% 7% 65%	4250
September	1st to 10th	Day	3 3 1 3 3 3 4 4 5% 7% 65%	2280
	11th to 20th	Day	2 3 1 3 3 3 4 4 6% 7% 65%	2187
	21st to end	Day	4 3 1 4 3 2 3 2 4 5% 70%	2052
October	1st to 10th	Day	6% 5% 1 4 2 3 4 3 5% 7% 59%	1900
	11th to 20th	Day	5% 5% 1 3 2 3 4 3 6% 7% 61%	1900
	21st to end	Day	3 5% 2 5% 3 2 4 3 6% 7% 59%	2010
November	1st to 10th	Day	3 4 2 4 3 4 4 4 6% 10% 56%	1810
	11th to 20th	Day	3 5% 1 4 3 3 4 4 5% 9% 58%	1520
	21st to end	Day	2 6% 3 6% 4 5% 5% 5% 5% 8% 51%	1520
December	1st to 10th	Day	3 7% 3 7% 5% 6% 7% 5% 5% 10% 43%	1520
	11th to 20th	Day	2 7% 2 6% 5% 5% 6% 5% 8% 11% 42%	1926
	21st to end	Day	3 9% 4 10% 6% 5% 6% 5% 8% 9% 37%	2794
January	1st to 10th	Night	2 7% 4 10% 6% 7% 7% 8% 10% 9% 30%	4316
	11th to 20th	Night	1 6% 3 11% 6% 5% 6% 6% 8% 10% 38%	4110
	21st to end	Night	2 10% 4 12% 8% 9% 7% 5% 7% 7% 28%	4521
February	1st to 10th	Night	1 6% 3 6% 4 5% 6% 5% 6% 12% 46%	2470
	11th to 20th	Night	2 6% 3 7% 6% 5% 6% 4 7% 10% 44%	2402
	21st to end	Night	1 7% 3 7% 5% 4 6% 4 6% 8% 48%	1914
March	1st to 10th	Night	3 8% 4 8% 4 3 5% 5% 7% 8% 44%	3430
	11th to 20th	Night	4 9% 2 5% 4 5% 6% 5% 8% 9% 44%	3490
	21st to end	Night	5% 12% 4 9% 6% 6% 5% 5% 6% 7% 34%	3828
April	1st to 10th	Night	4 7% 2 6% 5% 4 6% 5% 6% 8% 47%	1931
	11th to 20th	Night	7% 9% 2 6% 5% 5% 5% 5% 6% 8% 44%	1877
	21st to end	Night	4 6% 2 5% 5% 5% 6% 5% 8% 9% 45%	1771
May	1st to 10th	Night	8% 8% 3 6% 5% 5% 5% 4 6% 7% 44%	2860
	11th to 20th	Night	5% 6% 2 6% 5% 5% 5% 5% 7% 8% 48%	2712
	21st to end	Night	6% 5% 1 4 3 4 4 5% 6% 8% 55%	2762
June	1st to 10th	Night	3 3 1 5% 3 4 5% 4 8% 11% 54%	1520
	11th to 20th	Night	4 3 1 5% 3 3 4 4 5% 8% 59%	1520
	21st to end	Night	2 2 1 3 2 4 4 4 6% 7% 65%	1520
July	1st to 10th	Night	3 2 1 3 3 3 4 3 5% 6% 68%	2540
	11th to 20th	Night	1 2 1 3 4 4 7% 6% 9% 10% 53%	2752
	21st to end	Night	1 2 1 4 3 3 5% 4 8% 9% 61%	3109
August	1st to 10th	Night	2 2 1 4 3 3 4 4 7% 9% 62%	2847
	11th to 20th	Night	1 2 1 4 3 5% 7% 6% 8% 8% 56%	2811
	21st to end	Night	2 2 1 3 3 4 4 4 6% 7% 66%	3415
September	1st to 10th	Night	4 3 1 4 2 2 3 3 4 6% 69%	1900
	11th to 20th	Night	4 3 2 5% 3 3 4 3 6% 7% 61%	1990
	21st to end	Night	4 2 1 3 2 3 3 2 4 5% 71%	2128
October	1st to 10th	Night	5% 4 2 3 4 3 3 3 5% 7% 61%	2280
	11th to 20th	Night	3 4 1 4 3 3 3 3 5% 7% 63%	2280
	21st to end	Night	3 5% 2 5% 3 4 3 3 5% 8% 59%	2412
November	1st to 10th	Night	3 5% 1 4 3 3 4 4 6% 9% 56%	2246
	11th to 20th	Night	2 5% 2 5% 4 3 5% 4 6% 9% 55%	2660
	21st to end	Night	2 6% 2 6% 4 4 4 4 6% 7% 54%	2660
December	1st to 10th	Night	3 6% 3 7% 4 5% 4 4 8% 10% 47%	2660
	11th to 20th	Night	3 8% 3 6% 6% 5% 6% 7% 12% 11% 33%	3271
	21st to end	Night	3 9% 4 9% 6% 6% 7% 5% 9% 12% 31%	4873

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	35% 13% 16% 22% 13% 1	2670
	11th to 20th	Day	35% 13% 22% 22% 8% 1	2860
	21st to end	Day	41% 11% 20% 20% 8% 1	3146
February	1st to 10th	Day	34% 13% 18% 24% 10% 1	1710
	11th to 20th	Day	34% 12% 17% 24% 11% 2	1674
	21st to end	Day	35% 9% 17% 23% 14% 1	1533
March	1st to 10th	Day	32% 8% 18% 28% 12% 2	3444
	11th to 20th	Day	29% 8% 21% 31% 10% 1	3490
	21st to end	Day	41% 11% 17% 22% 7% 1	3825
April	1st to 10th	Day	34% 9% 15% 21% 16% 6%	2247
	11th to 20th	Day	37% 8% 13% 23% 16% 3	2254
	21st to end	Day	33% 10% 13% 25% 17% 1	2406
May	1st to 10th	Day	42% 7% 14% 16% 18% 3	4110
	11th to 20th	Day	26% 8% 16% 29% 18% 4	4192
	21st to end	Day	26% 7% 12% 26% 26% 3	4825
June	1st to 10th	Day	21% 8% 12% 24% 26% 9%	2660
	11th to 20th	Day	21% 6% 8% 17% 28% 20%	2660
	21st to end	Day	16% 5% 8% 14% 28% 28%	2660
July	1st to 10th	Day	12% 3 6% 11% 20% 48%	4361
	11th to 20th	Day	21% 6% 8% 16% 24% 25%	4141
	21st to end	Day	20% 6% 7% 15% 21% 31%	4314
August	1st to 10th	Day	21% 6% 9% 27% 19% 19%	4078
	11th to 20th	Day	18% 7% 11% 22% 26% 16%	4067
	21st to end	Day	16% 6% 11% 20% 24% 23%	4249
September	1st to 10th	Day	18% 4 8% 18% 27% 25%	2280
	11th to 20th	Day	17% 7% 9% 21% 29% 17%	2187
	21st to end	Day	19% 3 5% 24% 35% 14%	2052
October	1st to 10th	Day	26% 5% 11% 25% 25% 9%	1900
	11th to 20th	Day	22% 6% 9% 31% 25% 7%	1900
	21st to end	Day	23% 7% 14% 32% 21% 3	2010
November	1st to 10th	Day	23% 8% 14% 33% 19% 3	1810
	11th to 20th	Day	23% 9% 19% 31% 16% 1	1520
	21st to end	Day	30% 8% 16% 28% 18% 1	1520
December	1st to 10th	Day	36% 12% 22% 18% 10% 2	1520
	11th to 20th	Day	33% 11% 19% 27% 9%	1924
	21st to end	Day	38% 11% 14% 21% 13% 5%	2794
January	1st to 10th	Night	37% 11% 16% 22% 13% 1	4316
	11th to 20th	Night	33% 12% 23% 23% 8% 1	4110
	21st to end	Night	39% 11% 22% 19% 7% 2	4521
February	1st to 10th	Night	31% 9% 21% 26% 12% 2	2470
	11th to 20th	Night	34% 8% 15% 26% 16% 2	2403
	21st to end	Night	32% 8% 18% 25% 14% 3	1914
March	1st to 10th	Night	33% 7% 12% 32% 16% 1	3430
	11th to 20th	Night	28% 8% 21% 30% 12% 2	3490
	21st to end	Night	44% 10% 15% 23% 8% 1	3828
April	1st to 10th	Night	33% 8% 14% 23% 17% 5%	1931
	11th to 20th	Night	36% 7% 13% 22% 19% 3	1877
	21st to end	Night	30% 11% 15% 26% 16% 2	1771
May	1st to 10th	Night	36% 7% 11% 17% 23% 6%	2860
	11th to 20th	Night	28% 9% 14% 27% 15% 6%	2713
	21st to end	Night	24% 8% 11% 27% 29% 2	2762
June	1st to 10th	Night	21% 8% 14% 22% 24% 11%	1520
	11th to 20th	Night	23% 5% 9% 15% 27% 21%	1520
	21st to end	Night	16% 5% 8% 12% 30% 29%	1520
July	1st to 10th	Night	17% 4 6% 11% 19% 43%	2500
	11th to 20th	Night	20% 6% 8% 21% 24% 22%	2702
	21st to end	Night	17% 5% 9% 17% 25% 26%	3011
August	1st to 10th	Night	17% 5% 10% 26% 22% 21%	2838
	11th to 20th	Night	22% 7% 14% 19% 22% 16%	2838
	21st to end	Night	17% 5% 11% 17% 30% 19%	3415
September	1st to 10th	Night	17% 4 7% 19% 27% 26%	1900
	11th to 20th	Night	22% 7% 10% 22% 22% 18%	1990
	21st to end	Night	17% 4 7% 20% 39% 14%	2128
October	1st to 10th	Night	23% 5% 12% 24% 26% 11%	2280
	11th to 20th	Night	21% 5% 8% 31% 28% 7%	2280
	21st to end	Night	23% 7% 16% 28% 22% 4	2412
November	1st to 10th	Night	24% 9% 14% 27% 23% 3	2246
	11th to 20th	Night	24% 8% 17% 32% 18% 1	2660
	21st to end	Night	28% 7% 14% 29% 20% 3	2660
December	1st to 10th	Night	32% 10% 20% 23% 12% 2	2660
	11th to 20th	Night	34% 12% 16% 27% 11%	3272
	21st to end	Night	37% 8% 15% 18% 18% 2	4873

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	4 11% 28% 35% 19% 2	270
	11th to 20th	Day	4 18% 24% 40% 13% 1	270
	21st to end	Day	4 14% 28% 39% 14% 2	297
February	1st to 10th	Day	6% 20% 32% 36% 6% 1	270
	11th to 20th	Day	9% 13% 31% 37% 9%	270
	21st to end	Day	6% 15% 33% 39% 7%	258
March	1st to 10th	Day	9% 17% 34% 31% 9% 1	460
	11th to 20th	Day	9% 18% 30% 29% 11% 1	460
	21st to end	Day	13% 24% 35% 21% 6% 1	506
April	1st to 10th	Day	15% 20% 33% 20% 9% 3	460
	11th to 20th	Day	14% 26% 33% 18% 7% 1	452
	21st to end	Day	12% 27% 24% 27% 8% 2	460
May	1st to 10th	Day	13% 23% 32% 22% 9% 2	463
	11th to 20th	Day	10% 16% 27% 28% 14% 4	554
	21st to end	Day	9% 13% 25% 31% 18% 4	734
June	1st to 10th	Day	5% 10% 25% 30% 26% 4	680
	11th to 20th	Day	7% 15% 26% 30% 20% 2	680
	21st to end	Day	2 12% 28% 33% 21% 4	680
July	1st to 10th	Day	2 6% 20% 36% 28% 7%	671
	11th to 20th	Day	3 7% 21% 33% 28% 8%	545
	21st to end	Day	3 5% 22% 35% 26% 9%	531
August	1st to 10th	Day	3 6% 25% 37% 20% 8%	487
	11th to 20th	Day	4 6% 24% 40% 21% 6%	477
	21st to end	Day	2 7% 27% 33% 22% 9%	539
September	1st to 10th	Day	4 9% 27% 27% 22% 10%	490
	11th to 20th	Day	4 15% 31% 23% 19% 8%	490
	21st to end	Day	8% 15% 21% 26% 21% 9%	452
October	1st to 10th	Day	10% 11% 19% 24% 24% 11%	300
	11th to 20th	Day	7% 15% 21% 32% 19% 5%	300
	21st to end	Day	7% 16% 30% 30% 16% 1	306
November	1st to 10th	Day	7% 23% 21% 29% 16% 4	270
	11th to 20th	Day	5% 15% 29% 37% 12% 3	270
	21st to end	Day	7% 11% 21% 41% 16% 2	270
December	1st to 10th	Day	7% 12% 28% 36% 13% 4	270
	11th to 20th	Day	5% 11% 31% 44% 9%	270
	21st to end	Day	10% 12% 27% 38% 10% 2	297
January	1st to 10th	Night	6% 8% 25% 45% 15% 2	888
	11th to 20th	Night	4 9% 28% 44% 14% 2	760
	21st to end	Night	7% 8% 26% 44% 13% 2	836
February	1st to 10th	Night	4 8% 29% 47% 10% 1	760
	11th to 20th	Night	6% 6% 32% 46% 10%	744
	21st to end	Night	5% 10% 30% 47% 8% 1	628
March	1st to 10th	Night	6% 7% 27% 46% 12% 1	760
	11th to 20th	Night	6% 6% 22% 50% 15% 1	760
	21st to end	Night	8% 10% 28% 41% 12% 1	836
April	1st to 10th	Night	10% 11% 29% 40% 9%	601
	11th to 20th	Night	12% 12% 26% 39% 10% 1	563
	21st to end	Night	8% 12% 30% 33% 15% 3	570
May	1st to 10th	Night	11% 12% 26% 34% 16% 3	570
	11th to 20th	Night	7% 6% 19% 42% 22% 3	561
	21st to end	Night	6% 9% 21% 39% 22% 3	617
June	1st to 10th	Night	4 7% 21% 36% 29% 2	570
	11th to 20th	Night	7% 8% 22% 46% 16% 1	570
	21st to end	Night	3 4 14% 48% 28% 3	570
July	1st to 10th	Night	3 2 10% 43% 38% 3	555
	11th to 20th	Night	2 2 11% 43% 38% 5%	552
	21st to end	Night	2 1 6% 41% 45% 4	624
August	1st to 10th	Night	4 1 7% 46% 39% 3	567
	11th to 20th	Night	3 2 10% 45% 36% 3	564
	21st to end	Night	3 1 11% 41% 37% 7%	627
September	1st to 10th	Night	6% 2 14% 39% 33% 6%	570
	11th to 20th	Night	4 3 15% 46% 26% 5%	660
	21st to end	Night	5% 4 18% 38% 26% 9%	760
October	1st to 10th	Night	7% 5% 19% 40% 25% 3	760
	11th to 20th	Night	4 6% 20% 43% 22% 3	760
	21st to end	Night	7% 8% 23% 40% 19% 3	804
November	1st to 10th	Night	7% 6% 22% 44% 19% 2	759
	11th to 20th	Night	5% 9% 28% 44% 12% 2	950
	21st to end	Night	5% 11% 22% 45% 15% 2	950
December	1st to 10th	Night	7% 5% 26% 48% 13% 1	950
	11th to 20th	Night	7% 6% 25% 50% 11% 1	950
	21st to end	Night	10% 9% 28% 43% 7% 2	1045

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