Reynold's Creek
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Reynold's Creek clear sky chart from 2005-11-06 to 2024-12-09.

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 5% 4 4 4 4 6% 7% 55%	105439
	Night	4 5% 2 6% 4 4 5% 4 6% 7% 52%	103018
Transparency	Day	26% 6% 12% 21% 20% 15%	105183
	Night	29% 7% 13% 21% 18% 12%	102863
Seeing	Day	6% 10% 28% 31% 19% 6%	14610
	Night	7% 7% 24% 36% 22% 4	23947

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	4 11% 4 9% 7% 6% 7% 6% 8% 9% 27%	2539
	11th to 20th	Day	5% 11% 5% 10% 7% 6% 6% 6% 7% 9% 27%	2540
	21st to end	Day	6% 10% 4 12% 7% 8% 7% 5% 6% 8% 27%	2794
February	1st to 10th	Day	3 6% 3 8% 7% 7% 6% 5% 6% 9% 40%	1698
	11th to 20th	Day	4 9% 4 7% 6% 6% 5% 5% 7% 8% 41%	1850
	21st to end	Day	3 7% 3 9% 6% 5% 6% 5% 9% 8% 39%	1570
March	1st to 10th	Day	3 9% 4 10% 7% 6% 6% 4 7% 9% 35%	3138
	11th to 20th	Day	2 4 2 5% 4 4 4 4 6% 6% 59%	3325
	21st to end	Day	4 8% 3 8% 6% 7% 7% 6% 9% 10% 31%	4056
April	1st to 10th	Day	6% 7% 3 8% 7% 5% 5% 5% 6% 9% 40%	2280
	11th to 20th	Day	4 7% 3 6% 6% 5% 5% 4 6% 8% 46%	2263
	21st to end	Day	5% 6% 2 6% 4 4 5% 4 7% 8% 48%	2470
May	1st to 10th	Day	4 6% 2 5% 4 5% 5% 4 6% 8% 52%	4110
	11th to 20th	Day	4 3 1 3 3 3 3 3 4 6% 67%	4222
	21st to end	Day	4 4 1 5% 4 5% 5% 4 7% 9% 53%	4813
June	1st to 10th	Day	6% 6% 1 6% 5% 5% 5% 5% 7% 9% 44%	2660
	11th to 20th	Day	4 4 1 4 4 3 3 4 6% 8% 58%	2660
	21st to end	Day	2 1 1 2 2 2 3 4 4 7% 72%	2660
July	1st to 10th	Day	1 1 1 1 1 2 2 2 4 5% 80%	4420
	11th to 20th	Day	1 1 1 2 2 2 2 2 4 5% 78%	4420
	21st to end	Day	2 1 1 2 2 2 3 3 5% 6% 74%	4790
August	1st to 10th	Day	2 3 1 3 3 3 3 3 5% 7% 66%	4254
	11th to 20th	Day	1 1 1 2 2 2 2 3 6% 80%	3972
	21st to end	Day	2 2 1 2 2 2 3 2 4 4 77%	4180
September	1st to 10th	Day	1 2 2 2 2 2 2 4 5% 76%	2280
	11th to 20th	Day	3 3 1 4 3 3 3 3 5% 7% 66%	2123
	21st to end	Day	3 3 1 4 3 3 4 2 4 7% 68%	2090
October	1st to 10th	Day	3 3 1 3 3 3 3 3 4 4 72%	3490
	11th to 20th	Day	4 4 1 4 4 4 4 4 5% 7% 59%	3046
	21st to end	Day	3 4 1 5% 4 5% 5% 5% 6% 8% 54%	3101
November	1st to 10th	Day	5% 7% 3 7% 5% 5% 5% 4 6% 8% 44%	1764
	11th to 20th	Day	5% 6% 2 7% 5% 5% 6% 5% 7% 10% 42%	1800
	21st to end	Day	3 6% 3 6% 5% 5% 6% 5% 7% 10% 43%	1755
December	1st to 10th	Day	5% 7% 3 6% 6% 5% 5% 6% 7% 8% 42%	1584
	11th to 20th	Day	6% 8% 3 9% 8% 7% 6% 6% 7% 9% 30%	1928
	21st to end	Day	4 8% 3 10% 6% 6% 7% 5% 7% 9% 34%	2794
January	1st to 10th	Night	5% 10% 4 11% 7% 7% 7% 6% 8% 8% 26%	4406
	11th to 20th	Night	6% 11% 4 10% 7% 7% 7% 6% 7% 7% 28%	4420
	21st to end	Night	7% 11% 4 9% 5% 6% 6% 5% 6% 8% 33%	4862
February	1st to 10th	Night	4 6% 3 8% 7% 6% 5% 5% 7% 9% 39%	2477
	11th to 20th	Night	4 8% 2 6% 6% 6% 6% 5% 7% 9% 42%	2218
	21st to end	Night	4 7% 2 7% 5% 5% 6% 6% 8% 9% 40%	1884
March	1st to 10th	Night	3 7% 3 8% 5% 4 6% 5% 8% 9% 42%	3736
	11th to 20th	Night	4 7% 2 5% 4 3 4 3 5% 6% 56%	3655
	21st to end	Night	5% 8% 3 8% 5% 7% 7% 5% 7% 10% 36%	3595
April	1st to 10th	Night	5% 8% 2 6% 6% 5% 5% 4 6% 8% 45%	1900
	11th to 20th	Night	4 4 2 6% 5% 5% 6% 4 7% 7% 50%	1865
	21st to end	Night	5% 5% 2 6% 4 3 4 4 6% 7% 54%	1710
May	1st to 10th	Night	6% 4 1 5% 4 4 4 4 6% 8% 52%	2860
	11th to 20th	Night	3 3 1 3 3 3 4 3 5% 7% 67%	2659
	21st to end	Night	5% 5% 1 4 4 5% 4 3 6% 7% 57%	2762
June	1st to 10th	Night	6% 4 2 6% 4 5% 5% 5% 7% 10% 47%	1520
	11th to 20th	Night	4 4 1 4 4 3 5% 3 5% 7% 61%	1520
	21st to end	Night	1 1 1 3 2 3 3 3 6% 7% 69%	1520
July	1st to 10th	Night	1 1 1 2 2 3 2 4 4 81%	2540
	11th to 20th	Night	1 1 2 2 2 2 4 6% 79%	2540
	21st to end	Night	1 2 2 3 3 4 4 5% 6% 70%	2761
August	1st to 10th	Night	2 2 1 3 3 4 4 3 6% 7% 64%	2678
	11th to 20th	Night	1 1 1 1 2 2 3 3 4 5% 79%	2865
	21st to end	Night	3 2 2 1 2 2 2 3 4 78%	3498
September	1st to 10th	Night	3 1 1 2 2 2 3 2 4 5% 75%	1900
	11th to 20th	Night	3 2 1 3 3 2 3 4 6% 7% 66%	2057
	21st to end	Night	4 2 1 4 3 2 3 3 4 5% 69%	2090
October	1st to 10th	Night	3 2 1 3 2 2 3 3 5% 5% 71%	3490
	11th to 20th	Night	2 3 1 3 3 3 4 3 6% 8% 64%	3881
	21st to end	Night	5% 4 2 5% 4 5% 5% 4 6% 9% 52%	4457
November	1st to 10th	Night	6% 6% 2 6% 5% 4 6% 4 6% 8% 46%	2535
	11th to 20th	Night	7% 6% 2 6% 5% 4 6% 5% 6% 9% 43%	2600
	21st to end	Night	4 7% 2 6% 5% 5% 5% 5% 7% 7% 47%	2641
December	1st to 10th	Night	4 7% 3 9% 6% 6% 6% 5% 6% 7% 41%	2778
	11th to 20th	Night	7% 8% 3 9% 6% 6% 8% 6% 7% 9% 32%	3276
	21st to end	Night	5% 9% 4 9% 5% 6% 6% 5% 6% 8% 37%	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	46% 16% 19% 17% 2	2539
	11th to 20th	Day	52% 15% 19% 13% 2	2540
	21st to end	Day	51% 13% 21% 12% 2	2794
February	1st to 10th	Day	39% 10% 23% 23% 5% 1	1698
	11th to 20th	Day	39% 10% 19% 24% 8%	1860
	21st to end	Day	38% 8% 20% 23% 9% 2	1570
March	1st to 10th	Day	41% 9% 12% 25% 12% 1	3138
	11th to 20th	Day	24% 7% 11% 41% 16% 1	3325
	21st to end	Day	40% 12% 18% 21% 9% 2	4056
April	1st to 10th	Day	40% 6% 16% 23% 13% 3	2280
	11th to 20th	Day	34% 7% 13% 24% 18% 5%	2266
	21st to end	Day	30% 5% 15% 30% 17% 3	2470
May	1st to 10th	Day	29% 5% 10% 29% 23% 5%	4110
	11th to 20th	Day	18% 4 8% 21% 34% 14%	4225
	21st to end	Day	25% 6% 13% 31% 22% 3	4814
June	1st to 10th	Day	33% 6% 13% 27% 18% 2	2660
	11th to 20th	Day	23% 4 10% 25% 28% 11%	2660
	21st to end	Day	13% 3 7% 21% 35% 22%	2660
July	1st to 10th	Day	7% 2 4 10% 17% 60%	4351
	11th to 20th	Day	10% 1 3 7% 19% 60%	4345
	21st to end	Day	11% 2 3 8% 32% 44%	4639
August	1st to 10th	Day	17% 2 5% 10% 26% 39%	4238
	11th to 20th	Day	8% 2 4 13% 37% 37%	4011
	21st to end	Day	12% 2 4 15% 36% 31%	4179
September	1st to 10th	Day	11% 3 5% 16% 32% 33%	2280
	11th to 20th	Day	18% 3 10% 24% 27% 18%	2123
	21st to end	Day	19% 2 7% 26% 32% 13%	2090
October	1st to 10th	Day	18% 3 8% 17% 39% 15%	3490
	11th to 20th	Day	25% 3 13% 31% 25% 4	3046
	21st to end	Day	25% 4 15% 31% 22% 2	3101
November	1st to 10th	Day	36% 6% 17% 26% 14% 1	1764
	11th to 20th	Day	34% 9% 23% 26% 7% 1	1800
	21st to end	Day	33% 9% 22% 27% 8%	1755
December	1st to 10th	Day	38% 13% 23% 20% 6% 1	1584
	11th to 20th	Day	45% 13% 23% 15% 3	1928
	21st to end	Day	42% 11% 24% 18% 4	2794
January	1st to 10th	Night	47% 15% 21% 13% 3	4406
	11th to 20th	Night	51% 13% 18% 14% 4	4420
	21st to end	Night	46% 14% 19% 17% 4	4862
February	1st to 10th	Night	40% 10% 20% 25% 4 1	2477
	11th to 20th	Night	36% 10% 19% 23% 11% 1	2219
	21st to end	Night	36% 9% 19% 24% 11% 1	1884
March	1st to 10th	Night	35% 9% 14% 25% 16% 1	3736
	11th to 20th	Night	28% 5% 10% 31% 25% 1	3655
	21st to end	Night	35% 11% 18% 27% 9% 1	3595
April	1st to 10th	Night	36% 5% 14% 26% 16% 3	1900
	11th to 20th	Night	29% 6% 12% 30% 19% 4	1865
	21st to end	Night	26% 5% 14% 31% 21% 3	1710
May	1st to 10th	Night	26% 5% 10% 29% 25% 5%	2860
	11th to 20th	Night	16% 4 7% 22% 41% 10%	2659
	21st to end	Night	25% 5% 13% 26% 27% 3	2762
June	1st to 10th	Night	31% 5% 17% 27% 18% 2	1520
	11th to 20th	Night	23% 4 9% 22% 32% 10%	1520
	21st to end	Night	14% 2 9% 20% 32% 23%	1520
July	1st to 10th	Night	8% 2 3 8% 20% 59%	2500
	11th to 20th	Night	8% 1 3 6% 20% 61%	2492
	21st to end	Night	15% 2 3 6% 30% 43%	2674
August	1st to 10th	Night	19% 2 4 11% 26% 39%	2670
	11th to 20th	Night	9% 1 4 11% 27% 48%	2892
	21st to end	Night	12% 2 3 12% 35% 36%	3498
September	1st to 10th	Night	13% 2 4 13% 29% 38%	1900
	11th to 20th	Night	17% 3 9% 22% 24% 25%	2057
	21st to end	Night	18% 3 6% 21% 33% 20%	2090
October	1st to 10th	Night	16% 2 7% 17% 32% 26%	3490
	11th to 20th	Night	18% 2 10% 30% 32% 6%	3881
	21st to end	Night	28% 5% 13% 28% 24% 3	4457
November	1st to 10th	Night	35% 6% 15% 24% 19% 2	2535
	11th to 20th	Night	36% 6% 19% 28% 11%	2600
	21st to end	Night	34% 7% 20% 28% 12%	2641
December	1st to 10th	Night	40% 10% 22% 20% 7% 1	2778
	11th to 20th	Night	44% 14% 18% 21% 3	3276
	21st to end	Night	41% 12% 24% 16% 7%	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	12% 18% 27% 24% 16% 4	180
	11th to 20th	Day	8% 13% 31% 24% 19% 4	180
	21st to end	Day	9% 8% 31% 31% 18% 4	198
February	1st to 10th	Day	6% 19% 33% 21% 18% 3	315
	11th to 20th	Day	9% 19% 33% 25% 12% 3	455
	21st to end	Day	8% 19% 29% 29% 13% 2	382
March	1st to 10th	Day	7% 17% 38% 28% 9% 1	460
	11th to 20th	Day	5% 15% 30% 31% 15% 3	460
	21st to end	Day	9% 16% 34% 27% 12% 2	506
April	1st to 10th	Day	9% 23% 26% 22% 15% 5%	460
	11th to 20th	Day	7% 17% 35% 25% 12% 4	452
	21st to end	Day	8% 15% 35% 25% 14% 3	460
May	1st to 10th	Day	4 17% 31% 30% 14% 4	463
	11th to 20th	Day	12% 9% 27% 27% 18% 6%	488
	21st to end	Day	8% 7% 22% 33% 21% 9%	529
June	1st to 10th	Day	7% 8% 28% 29% 21% 7%	490
	11th to 20th	Day	5% 11% 31% 33% 15% 4	490
	21st to end	Day	2 7% 31% 33% 21% 7%	490
July	1st to 10th	Day	1 2 30% 41% 19% 7%	486
	11th to 20th	Day	2 3 29% 42% 20% 4	484
	21st to end	Day	2 2 23% 39% 28% 5%	531
August	1st to 10th	Day	3 3 27% 36% 25% 6%	487
	11th to 20th	Day	1 2 24% 36% 27% 11%	477
	21st to end	Day	3 5% 23% 35% 23% 12%	539
September	1st to 10th	Day	4 4 18% 32% 31% 12%	490
	11th to 20th	Day	4 5% 22% 31% 29% 10%	490
	21st to end	Day	4 7% 22% 35% 23% 9%	490
October	1st to 10th	Day	6% 10% 19% 27% 25% 12%	490
	11th to 20th	Day	6% 7% 26% 26% 25% 10%	407
	21st to end	Day	7% 11% 29% 28% 19% 6%	330
November	1st to 10th	Day	7% 14% 27% 31% 17% 4	300
	11th to 20th	Day	8% 11% 28% 31% 17% 5%	300
	21st to end	Day	5% 10% 27% 33% 21% 4	277
December	1st to 10th	Day	9% 10% 27% 26% 16% 12%	196
	11th to 20th	Day	8% 14% 33% 28% 15% 2	180
	21st to end	Day	8% 16% 29% 29% 14% 3	198
January	1st to 10th	Night	8% 8% 31% 29% 20% 4	760
	11th to 20th	Night	9% 9% 27% 30% 22% 4	760
	21st to end	Night	10% 5% 23% 33% 24% 4	836
February	1st to 10th	Night	7% 10% 31% 33% 17% 1	760
	11th to 20th	Night	7% 6% 31% 35% 17% 2	744
	21st to end	Night	7% 9% 33% 33% 16% 1	628
March	1st to 10th	Night	7% 12% 30% 34% 14% 3	760
	11th to 20th	Night	7% 9% 26% 37% 18% 4	760
	21st to end	Night	9% 13% 29% 33% 15% 1	836
April	1st to 10th	Night	9% 10% 25% 35% 19% 2	760
	11th to 20th	Night	6% 9% 30% 36% 16% 3	737
	21st to end	Night	7% 9% 29% 36% 15% 3	570
May	1st to 10th	Night	6% 8% 32% 34% 18% 2	570
	11th to 20th	Night	6% 8% 23% 34% 22% 6%	465
	21st to end	Night	8% 5% 24% 33% 26% 5%	411
June	1st to 10th	Night	7% 7% 22% 36% 22% 6%	380
	11th to 20th	Night	5% 9% 27% 36% 21% 2	380
	21st to end	Night	1 3 27% 39% 26% 3	380
July	1st to 10th	Night	1 2 18% 48% 28% 2	370
	11th to 20th	Night	1 2 19% 55% 24% 1	368
	21st to end	Night	2 1 15% 50% 29% 3	416
August	1st to 10th	Night	5% 2 15% 44% 33% 2	462
	11th to 20th	Night	1 1 13% 48% 33% 3	592
	21st to end	Night	3 3 16% 43% 30% 6%	836
September	1st to 10th	Night	4 1 13% 40% 36% 5%	760
	11th to 20th	Night	3 3 14% 39% 33% 9%	760
	21st to end	Night	5% 5% 16% 36% 27% 10%	760
October	1st to 10th	Night	7% 4 18% 37% 28% 6%	760
	11th to 20th	Night	5% 6% 18% 37% 27% 7%	760
	21st to end	Night	7% 6% 23% 37% 22% 6%	836
November	1st to 10th	Night	8% 7% 23% 35% 24% 3	780
	11th to 20th	Night	11% 9% 28% 32% 18% 3	800
	21st to end	Night	7% 7% 26% 33% 24% 4	800
December	1st to 10th	Night	8% 7% 27% 36% 19% 4	794
	11th to 20th	Night	11% 8% 24% 38% 17% 2	760
	21st to end	Night	12% 10% 33% 32% 11% 2	836

Page generated at 2024-12-06 01:54:50. Version ac07

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