Winnemucca
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Winnemucca clear sky chart from 2005-11-06 to 2024-11-01.

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	4 5% 2 5% 4 4 4 4 5% 7% 57%	101182
	Night	5% 7% 2 6% 4 4 4 4 5% 7% 51%	97940
Transparency	Day	26% 6% 9% 17% 21% 21%	100923
	Night	31% 6% 11% 18% 18% 16%	97789
Seeing	Day	8% 11% 24% 30% 21% 6%	14754
	Night	9% 6% 16% 39% 26% 5%	24103

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	5% 13% 4 9% 7% 6% 8% 5% 8% 10% 23%	2539
	11th to 20th	Day	7% 11% 4 11% 8% 5% 6% 5% 8% 9% 25%	2540
	21st to end	Day	8% 12% 4 10% 8% 9% 8% 6% 8% 9% 19%	2859
February	1st to 10th	Day	6% 8% 3 6% 6% 5% 6% 6% 8% 10% 36%	1805
	11th to 20th	Day	3 8% 3 7% 6% 6% 6% 5% 9% 10% 37%	1850
	21st to end	Day	3 8% 3 7% 5% 6% 6% 5% 7% 10% 38%	1570
March	1st to 10th	Day	4 9% 3 10% 7% 7% 6% 6% 7% 11% 30%	3138
	11th to 20th	Day	3 6% 2 6% 5% 4 6% 5% 8% 14% 43%	3259
	21st to end	Day	4 8% 3 9% 7% 7% 6% 6% 8% 10% 33%	4155
April	1st to 10th	Day	6% 10% 3 7% 5% 5% 5% 4 7% 9% 39%	2280
	11th to 20th	Day	5% 8% 2 6% 5% 5% 4 4 5% 8% 47%	2249
	21st to end	Day	7% 6% 2 6% 4 4 4 3 6% 9% 49%	2384
May	1st to 10th	Day	4 8% 2 5% 4 3 4 4 5% 8% 54%	4110
	11th to 20th	Day	4 3 1 3 2 3 2 3 5% 5% 69%	4161
	21st to end	Day	4 4 1 4 4 3 4 3 5% 6% 62%	4813
June	1st to 10th	Day	5% 4 1 5% 4 3 4 3 5% 7% 58%	2660
	11th to 20th	Day	4 3 1 3 3 2 2 3 4 6% 69%	2660
	21st to end	Day	2 2 1 3 2 2 3 2 3 5% 75%	2660
July	1st to 10th	Day	1 1 1 1 1 2 2 3 3 86%	4420
	11th to 20th	Day	1 1 1 2 2 2 3 3 4 5% 77%	4420
	21st to end	Day	2 2 1 3 3 3 3 3 4 6% 72%	4790
August	1st to 10th	Day	3 2 1 3 2 3 2 2 4 6% 72%	4222
	11th to 20th	Day	1 1 1 1 2 1 2 3 4 85%	3729
	21st to end	Day	2 2 2 2 2 2 2 2 3 81%	4180
September	1st to 10th	Day	1 1 1 2 2 1 2 1 3 4 82%	2280
	11th to 20th	Day	2 2 1 3 2 3 3 3 4 5% 72%	2156
	21st to end	Day	2 3 1 3 1 2 3 2 4 5% 73%	2090
October	1st to 10th	Day	4 4 2 4 3 4 3 2 4 6% 64%	2076
	11th to 20th	Day	4 4 2 4 2 2 3 3 5% 6% 65%	1900
	21st to end	Day	3 4 1 4 3 3 3 3 5% 9% 62%	1881
November	1st to 10th	Day	5% 9% 2 5% 4 4 4 4 5% 7% 51%	1674
	11th to 20th	Day	6% 6% 2 4 4 4 4 4 8% 10% 48%	1710
	21st to end	Day	5% 7% 3 7% 4 4 5% 4 6% 6% 47%	1710
December	1st to 10th	Day	6% 8% 3 8% 6% 5% 6% 4 5% 10% 40%	1530
	11th to 20th	Day	6% 10% 3 9% 8% 7% 7% 6% 7% 8% 27%	1928
	21st to end	Day	5% 11% 4 8% 7% 6% 7% 5% 6% 11% 31%	2794
January	1st to 10th	Night	4 12% 4 9% 6% 5% 6% 6% 7% 9% 31%	4406
	11th to 20th	Night	6% 12% 4 12% 8% 8% 6% 5% 7% 7% 27%	4420
	21st to end	Night	8% 13% 3 9% 7% 6% 8% 7% 7% 7% 25%	4796
February	1st to 10th	Night	4 9% 3 7% 5% 4 6% 5% 7% 8% 41%	2375
	11th to 20th	Night	4 8% 3 7% 6% 5% 5% 4 7% 10% 42%	2218
	21st to end	Night	3 10% 4 9% 6% 4 6% 5% 7% 8% 38%	1884
March	1st to 10th	Night	5% 12% 5% 11% 7% 5% 5% 5% 7% 9% 30%	3736
	11th to 20th	Night	3 8% 2 6% 5% 4 4 4 5% 9% 50%	3721
	21st to end	Night	6% 10% 3 9% 6% 6% 7% 5% 8% 9% 32%	3495
April	1st to 10th	Night	6% 7% 3 6% 6% 5% 4 5% 6% 8% 45%	1900
	11th to 20th	Night	5% 8% 3 5% 4 3 4 4 5% 8% 52%	1879
	21st to end	Night	7% 7% 2 6% 4 4 3 4 4 6% 54%	1796
May	1st to 10th	Night	6% 6% 2 5% 3 3 4 3 5% 6% 58%	2860
	11th to 20th	Night	3 3 1 3 3 3 3 3 3 7% 68%	2723
	21st to end	Night	5% 5% 2 5% 3 3 4 3 5% 6% 59%	2762
June	1st to 10th	Night	5% 4 2 5% 4 3 5% 4 6% 6% 56%	1520
	11th to 20th	Night	5% 2 1 3 3 4 4 2 4 5% 66%	1520
	21st to end	Night	2 2 1 2 3 3 4 3 4 6% 72%	1520
July	1st to 10th	Night	1 1 2 2 1 2 2 4 4 81%	2540
	11th to 20th	Night	3 2 1 3 3 3 3 3 4 5% 70%	2540
	21st to end	Night	1 3 1 3 3 3 4 4 6% 6% 65%	2761
August	1st to 10th	Night	3 2 1 4 3 3 4 3 5% 6% 66%	2710
	11th to 20th	Night	2 2 1 2 2 2 3 2 3 4 79%	3117
	21st to end	Night	4 2 1 2 2 2 1 1 2 3 80%	3498
September	1st to 10th	Night	3 2 1 3 2 1 2 1 3 5% 77%	1900
	11th to 20th	Night	3 4 1 4 2 3 3 3 4 5% 69%	2023
	21st to end	Night	3 2 1 3 2 2 2 2 4 5% 74%	2090
October	1st to 10th	Night	5% 3 1 4 3 3 3 2 3 4 67%	2099
	11th to 20th	Night	4 4 2 4 2 3 3 3 4 5% 67%	2280
	21st to end	Night	4 4 1 4 3 3 3 3 6% 7% 63%	2715
November	1st to 10th	Night	6% 7% 3 5% 5% 4 5% 4 6% 7% 49%	2411
	11th to 20th	Night	6% 6% 2 6% 5% 4 4 4 5% 7% 50%	2470
	21st to end	Night	5% 6% 3 7% 5% 4 5% 4 6% 8% 48%	2470
December	1st to 10th	Night	7% 8% 3 8% 5% 5% 5% 4 6% 8% 43%	2647
	11th to 20th	Night	6% 11% 4 9% 6% 6% 6% 4 7% 10% 30%	3276
	21st to end	Night	7% 11% 4 9% 6% 6% 6% 5% 7% 8% 29%	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	48% 14% 18% 17% 3	2539
	11th to 20th	Day	50% 12% 19% 12% 6% 1	2540
	21st to end	Day	53% 11% 20% 11% 4 1	2859
February	1st to 10th	Day	39% 8% 17% 24% 10% 1	1805
	11th to 20th	Day	38% 10% 15% 25% 12% 1	1860
	21st to end	Day	34% 11% 18% 25% 9% 2	1570
March	1st to 10th	Day	45% 11% 13% 21% 9% 1	3138
	11th to 20th	Day	26% 8% 22% 28% 14% 1	3259
	21st to end	Day	42% 11% 13% 22% 11% 2	4155
April	1st to 10th	Day	40% 6% 13% 23% 14% 4	2280
	11th to 20th	Day	34% 8% 10% 24% 19% 5%	2252
	21st to end	Day	32% 6% 12% 27% 19% 4	2384
May	1st to 10th	Day	25% 8% 8% 28% 25% 7%	4110
	11th to 20th	Day	18% 4 6% 17% 39% 15%	4164
	21st to end	Day	23% 6% 7% 23% 37% 5%	4814
June	1st to 10th	Day	25% 7% 8% 20% 30% 11%	2660
	11th to 20th	Day	18% 3 6% 17% 31% 24%	2660
	21st to end	Day	13% 3 3 12% 30% 39%	2660
July	1st to 10th	Day	6% 2 2 5% 14% 71%	4351
	11th to 20th	Day	10% 3 3 4 18% 63%	4345
	21st to end	Day	13% 4 4 7% 27% 46%	4639
August	1st to 10th	Day	15% 3 3 6% 20% 53%	4206
	11th to 20th	Day	7% 2 2 5% 23% 61%	3765
	21st to end	Day	10% 2 2 8% 33% 45%	4179
September	1st to 10th	Day	10% 2 2 8% 29% 50%	2280
	11th to 20th	Day	15% 4 5% 14% 31% 31%	2156
	21st to end	Day	16% 3 3 18% 31% 29%	2090
October	1st to 10th	Day	23% 4 6% 18% 26% 22%	2076
	11th to 20th	Day	21% 4 5% 23% 31% 15%	1900
	21st to end	Day	21% 5% 11% 30% 23% 10%	1881
November	1st to 10th	Day	34% 7% 11% 21% 22% 6%	1674
	11th to 20th	Day	31% 7% 13% 30% 18% 2	1710
	21st to end	Day	36% 7% 13% 24% 17% 3	1710
December	1st to 10th	Day	41% 7% 15% 22% 11% 4	1530
	11th to 20th	Day	50% 10% 16% 15% 9% 1	1928
	21st to end	Day	46% 10% 16% 19% 9%	2794
January	1st to 10th	Night	46% 12% 18% 19% 4	4406
	11th to 20th	Night	51% 11% 17% 12% 7% 2	4420
	21st to end	Night	49% 9% 21% 15% 6% 1	4796
February	1st to 10th	Night	38% 6% 18% 24% 12% 1	2375
	11th to 20th	Night	37% 6% 16% 26% 13% 2	2219
	21st to end	Night	39% 9% 15% 23% 11% 3	1884
March	1st to 10th	Night	45% 9% 13% 20% 11% 2	3736
	11th to 20th	Night	30% 6% 15% 30% 17% 2	3721
	21st to end	Night	43% 10% 17% 21% 7% 2	3495
April	1st to 10th	Night	36% 7% 14% 24% 15% 4	1900
	11th to 20th	Night	30% 7% 12% 28% 16% 7%	1879
	21st to end	Night	32% 5% 13% 25% 22% 4	1796
May	1st to 10th	Night	24% 7% 7% 29% 25% 8%	2860
	11th to 20th	Night	18% 5% 5% 16% 42% 14%	2724
	21st to end	Night	25% 6% 6% 22% 36% 5%	2762
June	1st to 10th	Night	28% 6% 7% 23% 26% 9%	1520
	11th to 20th	Night	20% 5% 6% 16% 36% 18%	1520
	21st to end	Night	14% 4 4 12% 29% 38%	1520
July	1st to 10th	Night	9% 2 2 5% 14% 68%	2500
	11th to 20th	Night	16% 3 2 4 15% 60%	2492
	21st to end	Night	16% 6% 4 7% 24% 42%	2674
August	1st to 10th	Night	19% 4 3 7% 17% 51%	2702
	11th to 20th	Night	11% 3 2 5% 21% 58%	3147
	21st to end	Night	13% 2 2 7% 29% 48%	3498
September	1st to 10th	Night	14% 2 3 6% 26% 50%	1900
	11th to 20th	Night	18% 4 4 14% 26% 34%	2023
	21st to end	Night	14% 3 5% 16% 29% 34%	2090
October	1st to 10th	Night	23% 3 4 19% 25% 26%	2099
	11th to 20th	Night	20% 4 5% 20% 31% 19%	2280
	21st to end	Night	20% 5% 8% 28% 26% 13%	2715
November	1st to 10th	Night	34% 6% 10% 20% 21% 9%	2411
	11th to 20th	Night	31% 6% 12% 25% 23% 3	2470
	21st to end	Night	34% 6% 12% 24% 21% 5%	2470
December	1st to 10th	Night	38% 7% 16% 23% 13% 3	2647
	11th to 20th	Night	47% 8% 16% 17% 9% 3	3276
	21st to end	Night	48% 9% 16% 16% 10%	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	19% 12% 20% 28% 17% 4	180
	11th to 20th	Day	9% 13% 21% 26% 25% 6%	180
	21st to end	Day	11% 4 22% 32% 22% 8%	237
February	1st to 10th	Day	8% 10% 26% 35% 16% 5%	415
	11th to 20th	Day	9% 13% 27% 34% 16% 1	455
	21st to end	Day	9% 14% 31% 30% 16% 1	382
March	1st to 10th	Day	12% 17% 27% 30% 13% 2	460
	11th to 20th	Day	8% 18% 28% 25% 18% 2	460
	21st to end	Day	11% 17% 33% 27% 11% 1	506
April	1st to 10th	Day	12% 18% 26% 24% 15% 4	460
	11th to 20th	Day	12% 19% 30% 23% 12% 4	452
	21st to end	Day	12% 16% 24% 26% 17% 4	460
May	1st to 10th	Day	8% 21% 30% 23% 13% 4	463
	11th to 20th	Day	13% 14% 27% 24% 16% 5%	488
	21st to end	Day	11% 12% 21% 27% 22% 7%	529
June	1st to 10th	Day	4 15% 24% 30% 20% 7%	490
	11th to 20th	Day	8% 17% 27% 30% 14% 4	490
	21st to end	Day	3 10% 25% 32% 23% 7%	490
July	1st to 10th	Day	2 5% 26% 36% 26% 6%	486
	11th to 20th	Day	1 4 24% 38% 25% 7%	484
	21st to end	Day	2 4 20% 41% 24% 9%	531
August	1st to 10th	Day	5% 4 21% 34% 27% 9%	487
	11th to 20th	Day	3 3 22% 33% 28% 10%	477
	21st to end	Day	2 6% 22% 34% 26% 9%	539
September	1st to 10th	Day	2 5% 21% 31% 29% 12%	490
	11th to 20th	Day	6% 8% 23% 29% 26% 9%	490
	21st to end	Day	4 7% 24% 29% 27% 9%	490
October	1st to 10th	Day	6% 12% 20% 26% 29% 8%	490
	11th to 20th	Day	6% 11% 18% 28% 30% 6%	490
	21st to end	Day	8% 9% 22% 29% 25% 7%	330
November	1st to 10th	Day	13% 11% 22% 23% 25% 6%	270
	11th to 20th	Day	6% 7% 23% 31% 26% 7%	270
	21st to end	Day	8% 9% 21% 31% 26% 5%	270
December	1st to 10th	Day	14% 7% 21% 29% 20% 10%	185
	11th to 20th	Day	14% 7% 21% 27% 25% 6%	180
	21st to end	Day	20% 9% 14% 30% 23% 4	198
January	1st to 10th	Night	10% 8% 18% 35% 22% 6%	760
	11th to 20th	Night	9% 8% 16% 40% 22% 5%	760
	21st to end	Night	14% 5% 15% 36% 25% 6%	836
February	1st to 10th	Night	10% 6% 19% 40% 22% 3	760
	11th to 20th	Night	9% 7% 20% 43% 19% 3	744
	21st to end	Night	9% 10% 21% 42% 17% 2	628
March	1st to 10th	Night	11% 8% 22% 39% 18% 2	760
	11th to 20th	Night	7% 9% 19% 39% 24% 2	760
	21st to end	Night	13% 9% 22% 40% 14% 2	836
April	1st to 10th	Night	11% 11% 20% 36% 21% 2	760
	11th to 20th	Night	10% 11% 21% 36% 18% 5%	751
	21st to end	Night	10% 7% 22% 35% 23% 3	656
May	1st to 10th	Night	9% 12% 23% 34% 21% 2	570
	11th to 20th	Night	9% 6% 19% 36% 25% 4	503
	21st to end	Night	9% 8% 15% 35% 28% 5%	411
June	1st to 10th	Night	7% 6% 18% 34% 30% 5%	380
	11th to 20th	Night	6% 6% 21% 39% 27% 3	380
	21st to end	Night	4 3 14% 47% 29% 3	380
July	1st to 10th	Night	2 2 12% 46% 35% 3	370
	11th to 20th	Night	3 1 9% 49% 36% 2	368
	21st to end	Night	2 2 6% 49% 38% 2	416
August	1st to 10th	Night	6% 3 8% 49% 31% 3	481
	11th to 20th	Night	2 3 9% 40% 41% 5%	743
	21st to end	Night	3 2 9% 41% 40% 5%	836
September	1st to 10th	Night	4 3 7% 39% 39% 9%	760
	11th to 20th	Night	4 4 10% 35% 36% 11%	760
	21st to end	Night	5% 3 10% 38% 32% 12%	760
October	1st to 10th	Night	7% 3 12% 38% 34% 6%	760
	11th to 20th	Night	7% 5% 12% 36% 34% 7%	760
	21st to end	Night	6% 5% 15% 38% 27% 8%	836
November	1st to 10th	Night	10% 5% 16% 34% 28% 6%	742
	11th to 20th	Night	9% 6% 15% 44% 22% 4	760
	21st to end	Night	9% 5% 17% 36% 27% 6%	760
December	1st to 10th	Night	13% 5% 16% 40% 20% 5%	760
	11th to 20th	Night	14% 7% 17% 39% 19% 3	760
	21st to end	Night	19% 7% 22% 36% 15% 2	836

Page generated at 2024-10-29 08:20:52. Version ac07

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