Peachland
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Peachland clear sky chart from 2005-11-06 to 2026-07-31.

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	7% 9% 3 8% 5% 5% 5% 4 6% 7% 39%	142146
	Night	8% 11% 4 9% 5% 5% 5% 4 6% 7% 38%	139532
Transparency	Day	40% 6% 17% 23% 12% 3	141865
	Night	43% 6% 18% 22% 10% 2	139395
Seeing	Day	14% 17% 29% 25% 12% 3	17598
	Night	14% 10% 28% 31% 15% 2	25956

By Month

Percentage Cloud Cover NW (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% 18% 5% 18% 7% 5% 5% 4 5% 4 19%	4339
	11th to 20th	Day	6% 12% 3 6% 5% 5% 3 3 5% 8% 44%	4716
	21st to end	Day	9% 17% 5% 9% 5% 5% 5% 5% 6% 5% 30%	5186
February	1st to 10th	Day	7% 16% 4 14% 9% 5% 5% 4 5% 6% 26%	1738
	11th to 20th	Day	7% 13% 4 9% 7% 6% 6% 5% 6% 7% 30%	1845
	21st to end	Day	6% 13% 5% 13% 9% 7% 7% 6% 6% 7% 21%	1699
March	1st to 10th	Day	4 10% 4 10% 6% 5% 6% 5% 8% 8% 32%	4618
	11th to 20th	Day	3 12% 3 9% 6% 6% 5% 5% 6% 8% 37%	4899
	21st to end	Day	9% 15% 4 9% 6% 6% 6% 5% 7% 7% 26%	6024
April	1st to 10th	Day	9% 11% 4 9% 7% 7% 6% 5% 7% 9% 26%	2520
	11th to 20th	Day	7% 11% 4 8% 6% 6% 7% 5% 7% 8% 31%	2500
	21st to end	Day	7% 11% 3 10% 6% 6% 6% 4 7% 8% 33%	2887
May	1st to 10th	Day	5% 7% 3 7% 5% 5% 5% 4 6% 8% 47%	8195
	11th to 20th	Day	7% 8% 4 8% 6% 6% 6% 5% 8% 9% 33%	8160
	21st to end	Day	10% 9% 3 8% 5% 6% 6% 5% 7% 9% 32%	8993
June	1st to 10th	Day	14% 9% 3 9% 6% 6% 5% 4 5% 7% 31%	3167
	11th to 20th	Day	11% 8% 3 9% 6% 7% 6% 5% 6% 7% 30%	3360
	21st to end	Day	9% 6% 3 8% 5% 6% 6% 5% 6% 8% 40%	3360
July	1st to 10th	Day	4 3 1 4 3 3 3 4 6% 8% 60%	6936
	11th to 20th	Day	3 2 1 3 3 3 3 3 4 6% 68%	6565
	21st to end	Day	3 2 1 4 3 4 4 4 6% 9% 59%	7015
August	1st to 10th	Day	2 2 1 3 4 4 5% 5% 7% 8% 60%	4541
	11th to 20th	Day	3 4 2 5% 4 5% 5% 5% 7% 8% 53%	4421
	21st to end	Day	7% 5% 2 5% 4 4 5% 4 6% 8% 49%	4377
September	1st to 10th	Day	5% 5% 2 6% 4 4 4 3 4 7% 55%	2400
	11th to 20th	Day	8% 6% 2 7% 5% 5% 5% 4 5% 6% 47%	2389
	21st to end	Day	10% 7% 2 6% 4 4 5% 4 6% 6% 45%	2168
October	1st to 10th	Day	6% 6% 3 7% 5% 5% 5% 4 5% 7% 46%	3280
	11th to 20th	Day	12% 8% 3 9% 6% 6% 5% 5% 5% 6% 36%	3174
	21st to end	Day	11% 10% 4 8% 5% 6% 5% 4 6% 7% 34%	3200
November	1st to 10th	Day	14% 14% 4 9% 6% 5% 5% 3 7% 7% 25%	1744
	11th to 20th	Day	10% 18% 4 10% 5% 5% 7% 4 5% 4 26%	1680
	21st to end	Day	10% 17% 6% 10% 8% 5% 4 4 6% 6% 25%	1585
December	1st to 10th	Day	6% 11% 4 12% 8% 6% 5% 4 7% 8% 29%	2360
	11th to 20th	Day	10% 21% 8% 14% 6% 4 5% 3 5% 4 19%	2712
	21st to end	Day	9% 20% 7% 14% 7% 7% 6% 4 5% 5% 16%	3393
January	1st to 10th	Night	9% 24% 8% 15% 6% 5% 5% 3 4 5% 17%	8550
	11th to 20th	Night	6% 11% 4 10% 5% 4 4 3 5% 7% 42%	8182
	21st to end	Night	10% 17% 4 8% 5% 5% 5% 4 5% 5% 33%	8994
February	1st to 10th	Night	9% 17% 6% 12% 7% 6% 5% 4 5% 6% 23%	2879
	11th to 20th	Night	7% 12% 4 9% 6% 6% 4 3 6% 7% 35%	2662
	21st to end	Night	6% 11% 6% 11% 7% 5% 6% 6% 8% 7% 26%	2107
March	1st to 10th	Night	4 9% 4 7% 6% 6% 6% 5% 6% 10% 38%	5496
	11th to 20th	Night	5% 11% 4 8% 5% 4 5% 4 5% 7% 42%	5317
	21st to end	Night	8% 11% 4 10% 7% 7% 7% 5% 7% 7% 27%	5193
April	1st to 10th	Night	6% 9% 3 9% 6% 5% 5% 5% 7% 9% 35%	2100
	11th to 20th	Night	5% 8% 4 9% 6% 7% 6% 6% 7% 6% 37%	2070
	21st to end	Night	5% 12% 3 8% 6% 5% 5% 4 6% 7% 40%	1729
May	1st to 10th	Night	4 5% 2 6% 4 5% 4 4 6% 7% 52%	4724
	11th to 20th	Night	5% 7% 3 6% 4 5% 5% 4 7% 10% 45%	4700
	21st to end	Night	8% 6% 2 6% 4 4 5% 5% 7% 10% 42%	5178
June	1st to 10th	Night	9% 7% 3 8% 5% 4 5% 5% 8% 9% 36%	1443
	11th to 20th	Night	7% 5% 2 8% 6% 5% 6% 4 7% 10% 40%	1260
	21st to end	Night	7% 5% 2 7% 5% 4 4 4 6% 6% 50%	1260
July	1st to 10th	Night	3 3 1 4 3 3 3 3 4 6% 67%	3239
	11th to 20th	Night	2 2 1 3 2 2 3 3 5% 6% 71%	3611
	21st to end	Night	3 3 1 4 3 3 3 3 5% 7% 64%	4049
August	1st to 10th	Night	2 2 1 4 3 3 4 4 7% 8% 63%	2609
	11th to 20th	Night	3 3 1 4 3 4 4 3 6% 9% 59%	2626
	21st to end	Night	7% 4 1 5% 3 4 4 4 6% 9% 53%	3540
September	1st to 10th	Night	4 4 2 5% 2 4 4 3 5% 8% 60%	2000
	11th to 20th	Night	7% 5% 2 5% 4 4 4 4 6% 7% 53%	2010
	21st to end	Night	9% 7% 2 6% 4 4 4 4 6% 8% 46%	2230
October	1st to 10th	Night	6% 5% 2 5% 4 5% 5% 4 6% 8% 49%	3920
	11th to 20th	Night	14% 7% 2 7% 5% 4 4 4 6% 7% 40%	3980
	21st to end	Night	12% 9% 3 7% 5% 4 4 4 5% 6% 41%	4600
November	1st to 10th	Night	14% 13% 4 8% 5% 5% 5% 5% 6% 7% 28%	2772
	11th to 20th	Night	12% 17% 4 9% 5% 4 5% 5% 5% 5% 28%	2940
	21st to end	Night	11% 18% 5% 12% 6% 5% 5% 3 5% 6% 24%	3011
December	1st to 10th	Night	6% 11% 3 11% 6% 5% 5% 4 7% 7% 34%	5040
	11th to 20th	Night	13% 21% 6% 15% 6% 5% 4 4 4 5% 16%	5700
	21st to end	Night	13% 20% 8% 13% 6% 5% 5% 3 4 5% 18%	7811

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	64% 5% 14% 13% 4	4339
	11th to 20th	Day	38% 6% 26% 22% 6% 3	4740
	21st to end	Day	53% 6% 19% 17% 6%	5187
February	1st to 10th	Day	58% 7% 12% 13% 8% 1	1738
	11th to 20th	Day	49% 10% 17% 17% 7%	1854
	21st to end	Day	57% 8% 16% 13% 6% 1	1699
March	1st to 10th	Day	43% 7% 18% 20% 12%	4618
	11th to 20th	Day	41% 6% 19% 27% 7% 1	4899
	21st to end	Day	52% 7% 16% 15% 9%	6024
April	1st to 10th	Day	50% 7% 17% 18% 7% 1	2520
	11th to 20th	Day	45% 7% 15% 19% 11% 2	2500
	21st to end	Day	44% 7% 16% 20% 12% 1	2887
May	1st to 10th	Day	32% 4 12% 36% 14% 1	8195
	11th to 20th	Day	42% 6% 17% 25% 9%	8163
	21st to end	Day	43% 5% 19% 27% 5% 1	8994
June	1st to 10th	Day	49% 5% 14% 17% 12% 4	3167
	11th to 20th	Day	47% 7% 14% 21% 11% 1	3360
	21st to end	Day	39% 6% 17% 22% 14% 2	3360
July	1st to 10th	Day	21% 4 12% 25% 26% 13%	6862
	11th to 20th	Day	17% 4 13% 27% 25% 14%	6487
	21st to end	Day	19% 4 16% 33% 22% 7%	6822
August	1st to 10th	Day	19% 4 12% 31% 28% 6%	4524
	11th to 20th	Day	26% 4 22% 32% 13% 3	4463
	21st to end	Day	30% 3 21% 28% 16% 2	4376
September	1st to 10th	Day	28% 5% 17% 28% 20% 3	2400
	11th to 20th	Day	34% 6% 16% 24% 18% 3	2389
	21st to end	Day	36% 6% 23% 21% 12% 2	2168
October	1st to 10th	Day	36% 3 24% 31% 6%	3280
	11th to 20th	Day	47% 5% 15% 27% 7%	3174
	21st to end	Day	47% 7% 19% 22% 5%	3200
November	1st to 10th	Day	53% 9% 16% 16% 5%	1744
	11th to 20th	Day	58% 10% 15% 13% 5% 1	1680
	21st to end	Day	58% 8% 16% 12% 6%	1585
December	1st to 10th	Day	52% 6% 26% 14% 1	2360
	11th to 20th	Day	66% 7% 13% 9% 5%	2714
	21st to end	Day	65% 8% 14% 11% 2	3393
January	1st to 10th	Night	68% 5% 14% 10% 4	8550
	11th to 20th	Night	43% 6% 20% 22% 7% 2	8220
	21st to end	Night	52% 5% 18% 19% 5%	8994
February	1st to 10th	Night	60% 6% 14% 13% 7% 1	2879
	11th to 20th	Night	48% 6% 17% 19% 9%	2664
	21st to end	Night	53% 8% 16% 15% 8%	2107
March	1st to 10th	Night	38% 7% 19% 25% 11%	5496
	11th to 20th	Night	39% 6% 19% 26% 10%	5318
	21st to end	Night	52% 8% 15% 18% 8%	5193
April	1st to 10th	Night	42% 7% 22% 22% 6%	2100
	11th to 20th	Night	41% 7% 19% 21% 11% 1	2070
	21st to end	Night	41% 5% 19% 23% 11% 1	1729
May	1st to 10th	Night	29% 4 11% 38% 18% 1	4721
	11th to 20th	Night	32% 5% 23% 30% 10%	4700
	21st to end	Night	35% 6% 23% 30% 6% 1	5182
June	1st to 10th	Night	40% 8% 15% 22% 11% 4	1443
	11th to 20th	Night	36% 5% 19% 28% 13%	1260
	21st to end	Night	31% 5% 22% 27% 13% 2	1260
July	1st to 10th	Night	19% 3 14% 25% 26% 13%	3204
	11th to 20th	Night	14% 4 18% 24% 27% 13%	3566
	21st to end	Night	19% 2 14% 37% 17% 10%	3937
August	1st to 10th	Night	18% 4 11% 28% 35% 5%	2601
	11th to 20th	Night	22% 3 25% 33% 13% 3	2650
	21st to end	Night	27% 3 23% 30% 16% 2	3540
September	1st to 10th	Night	23% 3 18% 32% 20% 4	2000
	11th to 20th	Night	28% 5% 16% 27% 21% 4	2010
	21st to end	Night	34% 6% 22% 26% 10% 3	2230
October	1st to 10th	Night	32% 3 26% 28% 10%	3920
	11th to 20th	Night	42% 5% 18% 27% 8%	3980
	21st to end	Night	44% 5% 18% 28% 6%	4600
November	1st to 10th	Night	52% 10% 17% 15% 6%	2772
	11th to 20th	Night	55% 10% 14% 14% 6% 1	2940
	21st to end	Night	60% 7% 17% 11% 5%	3011
December	1st to 10th	Night	49% 7% 23% 17% 3	5040
	11th to 20th	Night	69% 7% 13% 8% 3	5697
	21st to end	Night	66% 6% 12% 11% 4	7811

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	21% 16% 27% 21% 10% 5%	220
	11th to 20th	Day	20% 12% 28% 25% 12% 2	220
	21st to end	Day	19% 13% 32% 24% 12% 1	242
February	1st to 10th	Day	15% 20% 36% 19% 9% 1	278
	11th to 20th	Day	16% 17% 36% 24% 6% 1	425
	21st to end	Day	17% 19% 33% 22% 9%	430
March	1st to 10th	Day	15% 23% 33% 21% 7% 1	540
	11th to 20th	Day	17% 23% 27% 21% 9% 2	540
	21st to end	Day	18% 25% 30% 17% 8% 1	594
April	1st to 10th	Day	21% 22% 30% 17% 8% 1	540
	11th to 20th	Day	17% 26% 26% 19% 10% 3	532
	21st to end	Day	15% 20% 30% 23% 8% 4	540
May	1st to 10th	Day	13% 19% 34% 23% 8% 3	543
	11th to 20th	Day	17% 15% 25% 23% 16% 3	568
	21st to end	Day	15% 16% 28% 26% 13% 3	617
June	1st to 10th	Day	18% 15% 31% 24% 11% 1	797
	11th to 20th	Day	16% 19% 31% 22% 10% 3	990
	21st to end	Day	10% 13% 29% 29% 16% 3	990
July	1st to 10th	Day	8% 14% 31% 30% 15% 2	777
	11th to 20th	Day	6% 18% 26% 32% 15% 4	614
	21st to end	Day	5% 12% 28% 33% 18% 5%	616
August	1st to 10th	Day	5% 9% 27% 35% 19% 6%	527
	11th to 20th	Day	6% 10% 29% 30% 19% 5%	517
	21st to end	Day	9% 15% 23% 31% 15% 6%	583
September	1st to 10th	Day	8% 15% 26% 29% 14% 8%	530
	11th to 20th	Day	11% 15% 25% 29% 16% 4	530
	21st to end	Day	17% 15% 33% 23% 11% 2	530
October	1st to 10th	Day	13% 15% 32% 23% 13% 4	530
	11th to 20th	Day	17% 20% 25% 24% 11% 2	481
	21st to end	Day	23% 16% 33% 19% 7% 2	363
November	1st to 10th	Day	19% 19% 35% 20% 6%	272
	11th to 20th	Day	23% 24% 27% 15% 9% 2	220
	21st to end	Day	19% 16% 30% 23% 8% 4	220
December	1st to 10th	Day	14% 15% 25% 23% 17% 5%	220
	11th to 20th	Day	15% 20% 33% 22% 6% 3	220
	21st to end	Day	14% 13% 33% 25% 12% 2	242
January	1st to 10th	Night	23% 12% 29% 25% 9% 1	909
	11th to 20th	Night	18% 10% 32% 29% 11% 1	840
	21st to end	Night	15% 9% 31% 31% 12% 3	924
February	1st to 10th	Night	20% 12% 29% 28% 9% 2	840
	11th to 20th	Night	14% 10% 31% 32% 12% 1	824
	21st to end	Night	15% 13% 24% 30% 16% 1	692
March	1st to 10th	Night	13% 11% 29% 29% 16% 3	840
	11th to 20th	Night	13% 12% 32% 28% 13% 1	840
	21st to end	Night	13% 12% 30% 30% 13% 2	924
April	1st to 10th	Night	13% 12% 27% 34% 13% 2	840
	11th to 20th	Night	11% 14% 30% 29% 15% 1	822
	21st to end	Night	11% 13% 32% 30% 12% 1	469
May	1st to 10th	Night	10% 12% 27% 37% 13% 2	420
	11th to 20th	Night	11% 9% 23% 35% 21% 1	414
	21st to end	Night	13% 9% 25% 33% 19% 1	455
June	1st to 10th	Night	12% 11% 34% 30% 12% 1	420
	11th to 20th	Night	10% 12% 36% 28% 13% 1	420
	21st to end	Night	8% 10% 30% 34% 16% 2	420
July	1st to 10th	Night	5% 10% 25% 40% 18% 1	410
	11th to 20th	Night	2 12% 30% 37% 17% 1	408
	21st to end	Night	5% 8% 25% 37% 22% 2	458
August	1st to 10th	Night	3 5% 23% 39% 27% 4	398
	11th to 20th	Night	5% 3 23% 35% 30% 4	419
	21st to end	Night	6% 7% 23% 37% 24% 3	838
September	1st to 10th	Night	5% 8% 23% 33% 27% 4	800
	11th to 20th	Night	9% 7% 20% 29% 27% 10%	800
	21st to end	Night	11% 8% 25% 33% 19% 3	800
October	1st to 10th	Night	13% 8% 22% 34% 20% 4	800
	11th to 20th	Night	16% 11% 26% 30% 16% 2	800
	21st to end	Night	20% 12% 28% 26% 12% 3	880
November	1st to 10th	Night	20% 10% 32% 30% 8% 1	820
	11th to 20th	Night	22% 15% 26% 25% 11% 2	840
	21st to end	Night	19% 11% 30% 27% 10% 3	911
December	1st to 10th	Night	16% 10% 30% 29% 13% 2	1050
	11th to 20th	Night	23% 9% 33% 26% 8% 1	1050
	21st to end	Night	20% 11% 31% 29% 9% 1	1161

Page generated at 2026-07-28 00:25:23. Version ac07

Copyright © 2026 Attilla Danko.